Development and perspectives of the transition metal-based catalysts for water splitting

doi:10.3969/j.issn.2097-0706.2022.05.002

Abstract

Abstract:

With the implementation of the goals of carbon peaking and carbon neutrality and the construction of a new energy-oriented power system, the renewable energy generation technology with a focus on wind energy and solar energy is developing rapidly. However, the intermittence and fluctuation of renewable energy impacts the electric power and energy balance. Hydrogen production by water electrolysis has been regarded as one of the key technical means to realize the rebalancing of energy in a longer time and in a wider space. The main forms of electrolysis stacks, alkaline electrolysis, proton exchange membrane electrolysis and solid oxide electrolysis, are introduced and analyzed. Based on the reaction mechanism of water electrolysis, the importance of electrocatalysts in the reaction is pointed out.The development and improvement strategies of various novel electrocatalysts which include alloy materials, metal oxides, metal sulfides, metal phosphides, metal carbides and carbides are highlighted and reviewed here. And in-situ characterization techniques play vital roles in this development. Finally, the current problems and future perspectives of the catalysts for water splitting are proposed according to the forecasting on hydrogen production from water splitting.

Key words: carbon neutrality, electrocatalyst, overall water splitting, renewable energy, hydrogen production, in-situ characterization technique, perovskite, electrolyzer, new power system

CLC Number:

TK91

Yimin ZHANG, Jianli KANG, Naiqin ZHAO. Development and perspectives of the transition metal-based catalysts for water splitting[J]. Integrated Intelligent Energy, 2022, 44(5): 15-29.

Figures/Tables 10

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References 86

[1]	YOU B, TANG M T, TSAI C, et al. Enhancing electrocatalytic water splitting by strain engineering[J]. Advanced Materials, 2019, 31(17):1-28.
[2]	HUNTER M B, GRAY H B, MMULLER A, et al. Earth-abundant heterogeneous water oxidation catalysts[J]. Chemical Review, 2016, 116(22): 14120-14136. doi: 10.1021/acs.chemrev.6b00398
[3]	MEIER J C, GALEANO C, KATSOUNAROS I, et al. Degradation mechanisms of Pt/C fuel cell catalysts under simulated start-stop conditions[J]. Acs Catalysis, 2012, 2(5):832-843. doi: 10.1021/cs300024h
[4]	BERGEN A, PITT L, ROWE A, et al. Transient electrolyser response in a renewable-regenerative energy system[J]. International Journal of Hydrogen Energy, 2009, 34(1):64-70. doi: 10.1016/j.ijhydene.2008.10.007
[5]	WANG M, ZHANG L, HE Y, et al. Recent advances in transition-metal-sulfide-based bifunctional electrocatalysts for overall water splitting[J]. Journal of Materials Chemistry A, 2021 (9): 5320-5363.
[6]	COOK T R, DOGUTAN D K, REECE S Y, et al. Solar energy supply and storage for the legacy and non legacy worlds[J]. Chemical Reviews, 2010, 110(11):6474-6502. doi: 10.1021/cr100246c
[7]	SHAN J, ZHENG Y, SHI B, et al. Regulating electrocatalysts via surface and interface engineering for acidic water electrooxidation[J]. ACS Energy Letters, 2019, 4(11): 2719-2730. doi: 10.1021/acsenergylett.9b01758
[8]	SONG J, WEI C, HUANG Z F, et al. A review on fundamentals for designing oxygen evolution electrocatalysts[J]. Chemical Society Reviews, 2020, 49(7): 2196-2214. doi: 10.1039/C9CS00607A
[9]	BINNINGER T, MOHAMED R, WALTAR K, et al. Thermodynamic explanation of the universal correlation between oxygen evolution activity and corrosion of oxide catalysts[J]. Scientific Reports, 2015, 5: 12167. doi: 10.1038/srep12167
[10]	GRIMAUD A, DLAZ-MORALES O, HAN B, et al. Activating lattice oxygen redox reactions in metal oxides to catalyse oxygen evolution[J]. Nature Chemistry, 2017, 9(5): 457-465. doi: 10.1038/nchem.2695
[11]	ZHANG T, LIU X, XIN C, et al. Water splitting catalysts: Colloidal synthesis of Mo-Ni alloy nanoparticles as bifunctional electrocatalysts for efficient overall water splitting[J]. Advanced Materials Interfaces, 2018, 5(13):1870063. doi: 10.1002/admi.201870063
[12]	GAO M Y, YANG C, ZHANG Q B, et al. Facile electrochemical preparation of self-supported porous Ni-Mo alloy microsphere films as efficient bifunctional electrocatalysts for water splitting[J]. Journal of Materials Chemistry A, 2017, 5(12): 5797-5805. doi: 10.1039/C6TA10812A
[13]	TIAN J, CHENG N, LIU Q, et al. Self-supported NiMo hollow nanorod array: An efficient 3D bifunctional catalytic electrode for overall water splitting[J]. Journal of Materials Chemistry A, 2015.DOI: 10.1039/C5TA04723D. doi: 10.1039/C5TA04723D
[14]	FANG M, GAO W, DONG G, et al. Hierarchical NiMo-based 3D electrocatalysts for highly-efficient hydrogen evolution in alkaline conditions[J]. Nano Energy, 2016, 27:247-254. doi: 10.1016/j.nanoen.2016.07.005
[15]	LUO Y, ZHANG Z, YANG F, et al. Stabilized hydroxide-mediated nickel-based electrocatalysts for high-current-density hydrogen evolution in alkaline media[J]. Energy & Environmental Science, 2021, 14:4610-4619.
[16]	SHI H, ZHOU Y T, YAO R Q, et al. Spontaneously separated intermetallic Co₃Mo from nanoporous copper as versatile electrocatalysts for highly efficient water splitting[J]. Nature Communications, 2020, 11(1): 2940. doi: 10.1038/s41467-020-16769-6
[17]	ZHANG G, MING K, KANG J, et al. High entropy alloy as a highly active and stable electrocatalyst for hydrogen evolution reaction[J]. Electrochimica Acta, 2018, 279: 19-23. doi: 10.1016/j.electacta.2018.05.035
[18]	LIU H, QIN H, KANG J, et al. A freestanding nanoporous NiCoFeMoMn high-entropy alloy as an efficient electrocatalyst for rapid water splitting[J]. Chemical Engineering Journal, 2022, 435:134898. doi: 10.1016/j.cej.2022.134898
[19]	CUI M, YANG C, LI B, et al. High‐entropy metal sulfide nanoparticles promise high‐performance oxygen evolution reaction[J]. Advanced Energy Materials, 2020, 11(3).DOI: 10.1002/aenm.202002887 doi: 10.1002/aenm.202002887
[20]	QIAO H, WANG X, DONG Q, et al. A high-entropy phosphate catalyst for oxygen evolution reaction[J]. Nano Energy, 2021, 86. DOI: 10.1016/j.nanoen.2021.106029. doi: 10.1016/j.nanoen.2021.106029
[21]	QIU H J, FANG G, WEN Y, et al. Nanoporous high-entropy alloys for highly stable and efficient catalysts[J]. Journal of Materials Chemistry A, 2019, 7(11): 6499-6506. doi: 10.1039/C9TA00505F
[22]	JIN Z, LYU J, JIA H, et al. Nanoporous Al-Ni-Co-Ir-Mo high-entropy alloy for record-high water splitting activity in acidic environments[J]. Small, 2019, 15(47). DOI: 10.1002/smll.201904180. doi: 10.1002/smll.201904180
[23]	LI S, WANG J, LIN X, et al. Flexible solid-state direct ethanol fuel cell catalyzed by nanoporous high-entropy Al-Pd-Ni-Cu-Mo anode and spinel(AlMnCo)₃O₄ cathode[J]. Advanced Functional Materials, 2020, 31(5).DOI: 10.1002/adfm.202007129. doi: 10.1002/adfm.202007129
[24]	LU Y, HUANG K, CAO X, et al. Atomically dispersed intrinsic hollow sites of M-M1-M(M1 = Pt, Ir;M= Fe, Co, Ni, Cu, Pt, Ir) on FeCoNiCuPtIr nanocrystals enabling rapid water redox[J]. Advanced Functional Materials, 2022, 32(19). DOI: 10.1002/adfm.202110645. doi: 10.1002/adfm.202110645
[25]	JIA Z, TAO Y, SUN L, et al. A novel multinary intermetallic as an active electrocatalyst for hydrogen evolution[J]. Advanced Materials, 2020, 32(21).DOI: 10.1002/adma.202000385. doi: 10.1002/adma.202000385
[26]	WANG B, XU L, LIU G, et al. Biomass willow catkin-derived Co₃O₄/N-doped hollow hierarchical porous carbon microtubes as an effective tri-functional electrocatalyst[J]. Journal of Materials Chemistry A, 2017, 5(38): 20170-20179. doi: 10.1039/C7TA05002J
[27]	ZHANG P, LIU Y, LIANG T, et al. Nitrogen-doped carbon wrapped Co-Mo₂C dual Mott-Schottky nanosheets with large porosity for efficient water electrolysis[J]. Applied Catalysis B: Environmental, 2021, 284.DOI: 10.1016/j.apcatb.2020.119738. doi: 10.1016/j.apcatb.2020.119738
[28]	YOU B, ZHANG Y, YIN P, et al. Universal molecular-confined synthesis of interconnected porous metal oxides-N-C frameworks for electrocatalytic water splitting[J]. Nano Energy, 2018, 48: 600-606. doi: 10.1016/j.nanoen.2018.04.009
[29]	马天增, 付铭凯, 任婷, 等. 基于金属氧化物的两步法太阳能热化学循环制备燃料研究现状与展望[J]. 华电技术, 2021, 43(11): 110-127.
	MA Tianzeng, FU Mingkai, REN Ting, et al. Review and prospects of two-step solar thermochemical cycle for preparing fuels based on metal oxides[J]. Huadian Technology, 2021, 43(11): 110-127.
[30]	GAO X, ZHANG H, LI Q, et al. Hierarchical NiCo₂O₄ hollow microcuboids as bifunctional electrocatalysts for overall water-splitting[J]. Angew Chem Int Ed Engl, 2016, 55(21): 6290-6294. doi: 10.1002/anie.201600525
[31]	ZHU Y, ZHOU W, ZHONG Y, et al. A perovskite nanorod as bifunctional electrocatalyst for overall water splitting[J]. Advanced Energy Materials, 2017, 7(8).DOI: 10.1002/aenm.201602122. doi: 10.1002/aenm.201602122
[32]	HUA B, LI M, ZHANG Y Q, et al. All-in-one perovskite catalyst: Smart controls of architecture and composition toward enhanced oxygen/hydrogen evolution reactions[J]. Advanced Energy Materials, 2017, 7(20).DOI: 10.1002/aenm.201700666. doi: 10.1002/aenm.201700666
[33]	XU X, CHEN Y, ZHOU W, et al. A Perovskite electrocatalyst for efficient hydrogen evolution reaction[J]. Advanced Materials, 2016, 28(30): 6442-6448. doi: 10.1002/adma.201600005
[34]	ELAKKIYA R, RAMKUMAR R, MADURAIVEERAN G. Flower-like nickel-cobalt oxide nanomaterials as bi-functional catalyst for electrochemical water splitting[J]. Materials Research Bulletin, 2019, 116: 98-105. doi: 10.1016/j.materresbull.2019.04.016
[35]	CHEN W, QIAN G, XU Q, et al. Efficient bifunctional catalysts for overall water splitting: porous Fe-Mo oxide hybrid nanorods[J]. Nanoscale, 2020, 12(13): 7116-7123. doi: 10.1039/D0NR00446D
[36]	VENTURINI J, BONATTO F, GUAGLIANONI W C, et al. Cobalt-doped titanium oxide nanotubes grown via one-step anodization for water splitting applications[J]. Applied Surface Science, 2019, 464: 351-359. doi: 10.1016/j.apsusc.2018.09.093
[37]	HAN H, WOO J, HONG Y R, et al. Polarized electronic configuration in transition metal-fluoride oxide hollow nanoprism for highly efficient and robust water splitting[J]. ACS Applied Energy Materials, 2019, 2(6): 3999-4007. doi: 10.1021/acsaem.9b00449
[38]	GUO P, WANG Z, ZHANG T, ET al. Initiating an efficient electrocatalyst for water splitting via valence configuration of cobalt-iron oxide[J]. Applied Catalysis B: Environmental, 2019, 258:117968. doi: 10.1016/j.apcatb.2019.117968
[39]	ZHU Y P, MA T Y, JARONIEC M, et al. Self-templating synthesis of hollow Co₃O₄ microtube arrays for highly efficient water electrolysis[J]. Angew Chem Int Ed Engl, 2017, 56(5): 1324-1328. doi: 10.1002/anie.201610413
[40]	LI J, WANG Y, ZHOU T, et al. Nanoparticle superlattices as efficient bifunctional electrocatalysts for water splitting[J]. J Am Chem Soc, 2015, 137(45): 14305-14312. doi: 10.1021/jacs.5b07756
[41]	CHANDRASEKARAN S, ZHANG P, PENG F, et al. Tailoring the geometric and electronic structure of tungsten oxide with manganese or vanadium doping toward highly efficient electrochemical and photoelectrochemical water splitting[J]. Journal of Materials Chemistry A, 2019, 7(11): 6161-6172. doi: 10.1039/C8TA12238E
[42]	YU X, YU Z Y, ZHANG X L, et al. Highly disordered cobalt oxide nanostructure induced by sulfur incorporation for efficient overall water splitting[J]. Nano Energy, 2020, 71:104652. doi: 10.1016/j.nanoen.2020.104652
[43]	ZHANG X, DU X. Oxygen vacancies confined in nickel oxide nanoprism arrays for promoted electrocatalytic water splitting[J]. New Journal of Chemistry, 2020, 44(5): 1703-1706. doi: 10.1039/C9NJ05940G
[44]	LIU X, GONG M, DENG S, et al. Transforming damage into benefit: Corrosion engineering enabled electrocatalysts for water splitting[J]. Advanced Functional Materials, 2021, 31.DOI: 10.1002/adfm.202009032. doi: 10.1002/adfm.202009032
[45]	QIU H J, FANG G, GAO J, et al. Noble metal-free nanoporous high-entropy alloys as highly efficient electrocatalysts for oxygen evolution reaction[J]. ACS Materials Letters, 2019, 1(5): 526-533. doi: 10.1021/acsmaterialslett.9b00414
[46]	LIU J, ZHU D, LING T, et al. S-NiFe₂O₄ ultra-small nanoparticle built nanosheets for efficient water splitting in alkaline and neutral pH[J]. Nano Energy, 2017, 40: 264-273. doi: 10.1016/j.nanoen.2017.08.031
[47]	LIANG K, GUO L, MARCUS K, et al. Overall water splitting with room-temperature synthesized NiFe oxyfluoride nanoporous films[J]. ACS Catalysis, 2017, 7(12): 8406-8412. doi: 10.1021/acscatal.7b02991
[48]	TANG T, JIANG W J, NIU S, et al. Kinetically controlled coprecipitation for general fast synthesis of sandwiched metal hydroxide nanosheets/graphene composites toward efficient water splitting[J]. Advanced Functional Materials, 2018, 28(3). DOI: 10.1002/adfm.201704594. doi: 10.1002/adfm.201704594
[49]	TAHIR M, MAHMOOD N, PAN L, et al. Efficient water oxidation through strongly coupled graphitic C₃N₄ coated cobalt hydroxide nanowires[J]. Journal of Materials Chemistry A, 2016, 4(33): 12940-12946. doi: 10.1039/C6TA05088C
[50]	RAO Y, WANG Y, NING H, et al. Hydrotalcite-like Ni(OH)₂ nanosheets in situ grown on nickel foam for overall water splitting[J]. ACS Appl Mater Interfaces, 2016, 8(49): 33601-33607. doi: 10.1021/acsami.6b11023
[51]	NIU S, JIANG W J, TANG T, et al. Facile and scalable synthesis of robust Ni(OH)₂ nanoplate arrays on NiAl foil as hierarchical active scaffold for highly efficient overall water splitting[J]. Advanced Science, 2017, 4(8). DOI: 10.1002/advs.201700084. doi: 10.1002/advs.201700084
[52]	LEI L, HUANG D, ZHOU C, et al. Demystifying the active roles of NiFe-based oxides/(oxy)hydroxides for electrochemical water splitting under alkaline conditions[J]. Coordination Chemistry Reviews, 2020.DOI: 10.1016/j.ccr.2019.213177. doi: 10.1016/j.ccr.2019.213177
[53]	QIU Z, TAI C, NIKLASSON G A, et al. Direct observation of active catalyst surface phases and the effect of dynamic self-optimization in NiFe-layered double hydroxides for alkaline water splitting[J]. Energy & Environmental Science, 2019, 12(2): 572-581.
[54]	BABAR P, LOKHANDE A, SHIN H H, et al. Cobalt iron hydroxide as a precious metal-free bifunctional electrocatalyst for efficient overall water splitting[J]. Small, 2018, 14(7). DOI: 10.1002/smll.201702568. doi: 10.1002/smll.201702568
[55]	FENG Y, WANG X, HUANG J, et al. Decorating CoNi layered double hydroxides nanosheet arrays with fullerene quantum dot anchored on Ni foam for efficient electrocatalytic water splitting and urea electrolysis[J]. Chemical Engineering Journal, 2020, 390:124525. doi: 10.1016/j.cej.2020.124525
[56]	JIA Y, ZHANG L, GAO G, et al. A Heterostructure Coupling of Exfoliated Ni-Fe Hydroxide Nanosheet and Defective Graphene as a Bifunctional Electrocatalyst for Overall Water Splitting[J]. Advanced Materials, 2017, 29(17):1700017. doi: 10.1002/adma.201700017
[57]	ZHANG Q, BEDFORD N M, PAN J, et al. A fully reversible water electrolyzer cell made up from FeCoNi (oxy)hydroxide atomic layers[J]. Advanced Energy Materials, 2019, 9(29):1901312. doi: 10.1002/aenm.201901312
[58]	HAN L, DIAO L, QIN K, et al. Nitrogen modification enhances the electrocatalytic overall water splitting of NiFe layered double hydroxides in alkaline media[J]. Materials Letters, 2020, 263.DOI: 10.1016/j.matlet.2019.127162. doi: 10.1016/j.matlet.2019.127162
[59]	ZHU X, TANG C, WANG H F, et al. Monolithic-structured ternary hydroxides as freestanding bifunctional electrocatalysts for overall water splitting[J]. Journal of Materials Chemistry A, 2016, 4(19): 7245-7250. doi: 10.1039/C6TA02216B
[60]	DONH K N, ZHENG P, DAI Z, et al. Ultrathin porous NiFeV ternary layer hydroxide nanosheets as a highly efficient bifunctional electrocatalyst for overall water splitting[J]. Small, 2018, 14(8).DOI: 10.1002/smll.201703257. doi: 10.1002/smll.201703257
[61]	BAO J, WANG Z, XIE J, et al. A ternary cobalt-molybdenum-vanadium layered double hydroxide nanosheet array as an efficient bifunctional electrocatalyst for overall water splitting[J]. Chem Commun(Camb), 2019, 55(24): 3521-3524.
[62]	TONG Y, YU X, SHI G. Cobalt disulfide/graphite foam composite films as self-standing electrocatalytic electrodes for overall water splitting[J]. Phys Chem Chem Phys, 2017, 19(6): 4821-4826. doi: 10.1039/C6CP08176B
[63]	LYU J J, ZHAO J, FANG H, et al. Incorporating nitrogen-doped graphene quantum dots and Ni₃S₂nanosheets: A synergistic electrocatalyst with highly enhanced activity for overall water splitting[J]. Small, 2017, 13(24).DOI: 10.1002/smll.201700264. doi: 10.1002/smll.201700264
[64]	HUANG S, MENG Y, HE S, et al. N- O-, and S-tridoped carbon-encapsulated Co₉S₈ nanomaterials: Efficient bifunctional electrocatalysts for overall water splitting[J]. Advanced Functional Materials, 2017, 27(17).DOI: 10.1002/adfm.201606585. doi: 10.1002/adfm.201606585
[65]	JIANG K, LUO M, LIU Z, et al. Rational strain engineering of single-atom ruthenium on nanoporous MoS₂ for highly efficient hydrogen evolution[J]. Nature Communications, 2021, 12(1).DOI: 10.1038/s41467-021-21956-0. doi: 10.1038/s41467-021-21956-0
[66]	ZAHRAN Z N, MOHAMED E A, TSUBONOUCHI Y, et al. Electrocatalytic water splitting with unprecedentedly low overpotentials by nickel sulfide nanowires stuffed into carbon nitride scabbards[J]. Energy & Environmental Science, 2021.DOI: 10.1039/D1EE00509J. doi: 10.1039/D1EE00509J
[67]	YU Q, ZHANG Z, QIU S, et al. A Ta-TaS₂ monolith catalyst with robust and metallic interface for superior hydrogen evolution[J]. Nat Commun, 2021, 12(1): 6051. doi: 10.1038/s41467-021-26315-7
[68]	JI X, LIN Y, ZENG J, et al. Graphene/MoS₂/FeCoNi(OH)_x and Graphene/MoS₂/FeCoNiP_x multilayer-stacked vertical nanosheets on carbon fibers for highly efficient overall water splitting[J]. Nature Communications, 2021, 12(1). DOI: 10.1038/s41467-021-21742-y. doi: 10.1038/s41467-021-21742-y
[69]	XUE Y, ZUO Z, LI Y, et al. Graphdiyne-supported NiCo₂S₄ Nanowires: A highly active and stable 3D bifunctional electrode material[J]. Small, 2017, 13(31).DOI: 10.1002/smll.201700936. doi: 10.1002/smll.201700936
[70]	LEE T H, LEE S A, ARK H, et al. Understanding the enhancement of the catalytic properties of goethite by transition metal doping: Critical role of O^* formation energy relative to OH^* and OOH^*[J]. ACS Applied Energy Materials, 2020, 3(2): 1634-1643. doi: 10.1021/acsaem.9b02140
[71]	SUN H, YAN Z, LIU F, et al. Self-supported transition-metal-based electrocatalysts for hydrogen and oxygen evolution[J]. Advanced Materials, 2020, 32(3):1-18.
[72]	LIANG H, GANDI A N, ANJUM D H, et al. Plasma-assisted synthesis of NiCoP for efficient overall water splitting[J]. Nano Lett, 2016, 16(12): 7718-7725. doi: 10.1021/acs.nanolett.6b03803
[73]	QU M, JIANG Y, YANG M, et al. Regulating electron density of NiFe-P nanosheets electrocatalysts by a trifle of Ru for high-efficient overall water splitting[J]. Applied Catalysis B: Environmental, 2020, 263.DOI: 10.1016/j.apcatb.2019.118324. doi: 10.1016/j.apcatb.2019.118324
[74]	QIU B, CAI L, WANG Y, et al. Fabrication of nickel-cobalt bimetal phosphide nanocages for enhanced oxygen evolution catalysis[J]. Advanced Functional Materials, 2018, 28(17).DOI: 10.1002/adfm.201706008. doi: 10.1002/adfm.201706008
[75]	LV X W, XU W S, TIAN W W, et al. Activity promotion of core and shell in multifunctional core-shell Co₂P@NC electrocatalyst by secondary metal doping for water electrolysis and Zn-air batteries[J]. Small, 2021, 17(38): 2101856. doi: 10.1002/smll.202101856
[76]	ZHAO Z, SCHIPPER D E, LEITNER A P, et al. Bifunctional metal phosphide FeMnP films from single source metal organic chemical vapor deposition for efficient overall water splitting[J]. Nano Energy, 2017, 39: 444-453. doi: 10.1016/j.nanoen.2017.07.027
[77]	JIA X, ZHAO Y, CHEN G, et al. Ni₃FeN nanoparticles derived from ultrathin nife-layered double hydroxide nanosheets: An efficient overall water splitting electrocatalyst[J]. Advanced Energy Materials, 2016, 6(10): 1614-6832.
[78]	KOU Z, WANG T, GU Q, et al. Rational design of holey 2D nonlayered transition metal carbide/nitride heterostructure nanosheets for highly efficient water oxidation[J]. Advanced Energy Materials, 2019, 9(16): 1803768. doi: 10.1002/aenm.201803768
[79]	YANG H, CHEN Y, WANG C, et al. Confined growth of ultrafine Mo₂C nanoparticles embedded in N-doped carbon nanosheet for water splitting[J]. Journal of Alloys and Compounds, 2020, 842.DOI: 10.1016/j.jallcom.2020.155939. doi: 10.1016/j.jallcom.2020.155939
[80]	WANG H, CAO Y, SUN C, et al. Strongly coupled molybdenum carbide on carbon sheets as a bifunctional electrocatalyst for overall water splitting[J]. ChemSusChem, 2017, 10(18): 3540-3546. doi: 10.1002/cssc.201701276
[81]	OUYANG T, YE Y Q, WU C Y, et al. Heterostructures composed of N-doped carbon nanotubes encapsulating cobalt and beta-Mo₂C nanoparticles as bifunctional electrodes for water splitting[J]. Angewandte Chemie International Edition, 2019, 58(15): 4923-4928. doi: 10.1002/anie.201814262
[82]	MUNIR A, HAQ T U, SALEEM M, et al. Controlled engineering of nickel carbide induced N-enriched carbon nanotubes for hydrogen and oxygen evolution reactions in wide pH range[J]. Electrochimica Acta, 2020, 341:136032. doi: 10.1016/j.electacta.2020.136032
[83]	ZHANG S, GAO G, HAO J, et al. Low-electronegativity vanadium substitution in cobalt carbide induced enhanced electron transfer for efficient overall water splitting[J]. ACS Appl Mater Interfaces, 2019, 11(46):43261-43269. doi: 10.1021/acsami.9b16390
[84]	SHEN T H, SPILLANE L, VAVRA J, et al. Oxygen evolution reaction in Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ aided by intrinsic Co/Fe spinel-like surface[J]. Journal of the American Chemical Society, 2020, 142:15876-15883. doi: 10.1021/jacs.0c06268
[85]	YAN Z, SUN H, CHEN X, et al. Anion insertion enhanced electrodeposition of robust metal hydroxide/oxide electrodes for oxygen evolution[J]. Nature Communications, 2018(9):2373.
[86]	GAO L, CUI X, WANG Z, et al. Operando unraveling photothermal-promoted dynamic active sites generation in spinel NiFe₂O₄ for oxygen evolution[J]. Proceedings of the National Academy of Sciences, 2021, 118(7).DOI: 10.1073/pnas.2023421118. doi: 10.1073/pnas.2023421118