首页|Striking Stabilization Effect of Spinel Cobalt Oxide Oxygen Evolution Electrocatalysts in Neutral pH by Dual-Sites Iron Incorporation

Striking Stabilization Effect of Spinel Cobalt Oxide Oxygen Evolution Electrocatalysts in Neutral pH by Dual-Sites Iron Incorporation

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Developing stable and efficient nonprecious-metal-based oxygen evolution catalysts in the neutral electrolyte is a challenging but essential goal for various electrochemical systems.Particularly,cobalt-based spinels have drawn a considerable amount of attention but most of them operate in alkali solutions.However,the frequently studied Co-Fe spinel system never exhibits appreciable stability in nonbasic conditions,not to mention attract further investigation on its key structural motif and transition states for activity loss.Herein,we report exceptional stable Co-Fe spinel oxygen evolution catalysts(～30％Fe is optimal)in a neutral electrolyte,owing to its unique metal ion arrangements in the crystal lattice.The introduced iron content enters both the octahedral and tetrahedral sites of the spinel as Fe2+and Fe3+(with Co ions having mixed distribution as well).Combining density functional theory calculations,we find that the introduction of Fe to Co3O4 lowers the covalency of metal-oxygen bonds and can help suppress the oxidation of Co2+/3+and 02-.It implies that the Co-Fe spinel will have minor surface reconstruction and less lattice oxygen loss during the oxygen evolution reaction process in comparison with Co3O4 and hence show much better stability.These findings suggest that there is still much chance for the spinel structures,especially using reasonable sublattices engineering via multimetal doping to develop advanced oxygen evolution catalysts.

dual-sites ironelectrocatalyst stabilityneutral electrolyteoxygen evolution reactionspinel oxides

Shuairu Zhu、Xue Wang、Jiabo Le、Na An、Jianming Li、Deyu Liu、Yongbo Kuang

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Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province,Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences,1219 Zhongguan West Road,Ningbo 315201,China

Zhejiang Institute of Tianjin University,85 Zhongguan West Road,Ningbo 315201,China

Research Center of New Energy,Research Institute of Petroleum Exploration& Development,20 Xueyuan Road,Beijing 100083,China

Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,19(A)Yuquan Road,Beijing 100049,China

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National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)Zhejiang Provincial Natural Science FoundationK.C.Wong Education FoundationNingbo major special projects of the Plan"Science and Technology Innovation 2025"Ningbo major special projects of the Plan"Science and Technology Innovation 2025"Ningbo 3315 ProgramYongjiang Talent Introduction Program

2190528851904288LZ21B030001GJTD-2019-132018B100562019B100462021A-115-G

2024

10.1002/eem2.12594

能源与环境材料(英文)

能源与环境材料(英文)

ISSN：
年,卷(期)：2024.7(2)