Oxygen vacancy assisted hydrogen evolution reaction over CeO2-based solid solutions

IF 3.2 Q2 CHEMISTRY, PHYSICAL

Energy advances Pub Date : 2025-05-19 DOI:10.1039/D5YA00027K

Saraswati Roy and Sounak Roy

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Abstract

Producing sustainable hydrogen through water electrolysis is a promising approach to meet the growing demand for renewable energy storage. Developing affordable and efficient electrocatalysts made from non-precious metals to replace platinum-based catalysts for hydrogen evolution reactions (HERs) continues to be a significant challenge. In the present study, pristine CeO₂ and doped solid solutions Ce_0.95Co_0.05O₂, Ce_0.95Ni_0.05O₂ and Ce_0.95Cu_0.05O₂ were evaluated for the HER, and the electrochemical studies in alkaline medium showed superior HER activity for the doped catalysts, with Ce_0.95Ni_0.05O₂ achieving the lowest overpotential and highest mass activity, comparable to Pt/C. Tafel slopes and EIS measurements suggested a Volmer–Heyrovsky mechanism facilitated by oxygen vacancies and hydrogen spill-over. Stability tests confirmed the durability of Ce_0.95Ni_0.05O₂ under prolonged HER conditions. This study highlights aliovalent doping as a viable strategy for engineering oxygen vacancies and enhancing CeO₂-based catalysts for alkaline water electrolysis.

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氧空位辅助ceo2固溶体上的析氢反应

通过水电解生产可持续氢气是满足日益增长的可再生能源存储需求的一种有前途的方法。开发价格合理且高效的非贵金属电催化剂来取代铂基催化剂用于析氢反应（HERs）仍然是一个重大挑战。在本研究中，对纯净的CeO2和掺杂的固溶体Ce0.95Co0.05O2、Ce0.95Ni0.05O2和Ce0.95Cu0.05O2进行了HER评价，在碱性介质中的电化学研究表明，掺杂的催化剂具有较好的HER活性，Ce0.95Ni0.05O2的过电位最低，质量活性最高，与Pt/C相当。Tafel斜率和EIS测量表明，氧空位和氢溢出促进了Volmer-Heyrovsky机制。稳定性试验证实了Ce0.95Ni0.05O2在长时间HER条件下的耐久性。这项研究强调了共价掺杂是一种可行的策略，用于工程氧空位和增强碱性水电解中基于ceo2的催化剂。

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来源期刊

Energy advances

CiteScore

1.80

自引率

0.00%

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