Efficient Optimization of Electron/Oxygen Pathway by Constructing Ceria/Hydroxide Interface for Highly Active Oxygen Evolution Reaction,Advanced Functional Materials

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Efficient Optimization of Electron/Oxygen Pathway by Constructing Ceria/Hydroxide Interface for Highly Active Oxygen Evolution Reaction
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-01-09 , DOI: 10.1002/adfm.201908367
Jiale Xia ₁ , Hongyang Zhao ₁ , Bolong Huang ₂ , Lingling Xu ₁ , Meng Luo ₁ , Jianwei Wang ₁ , Feng Luo ₃ , Yaping Du ₄ , Chun‐Hua Yan _{4,

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Affiliation

Owing to the unique electronic properties, rare‐earth modulations in noble‐metal electrocatalysts emerge as a critical strategy for a broad range of renewable energy solutions such as water‐splitting and metal–air batteries. Beyond the typical doping strategy that suffers from synthesis difficulties and concentration limitations, the innovative introduction of rare‐earth is highly desired. Herein, a novel synthesis strategy is presented by introducing CeO₂ support for the nickel–iron–chromium hydroxide (NFC) to boost the oxygen evolution reaction (OER) performance, which achieves an ultralow overpotential at 10 mA cm⁻² of 230.8 mV, the Tafel slope of 32.7 mV dec⁻¹, as well as the excellent durability in alkaline solution. Density functional theory calculations prove the established d–f electronic ladders, by the interaction between NFC and CeO₂, evidently boosts the high‐speed electron transfer. Meanwhile, the stable valence state in CeO₂ preserves the high electronic reactivity for OER. This work demonstrates a promising approach in fabricating a nonprecious OER electrocatalyst with the facilitation of rare‐earth oxides to reach both excellent activity and high stability.

中文翻译：

通过构建二氧化铈/氢氧化物界面实现高活性氧释放反应的电子/氧途径的有效优化

由于其独特的电子特性，贵金属电催化剂中的稀土调节已成为各种可再生能源解决方案（如水分解和金属空气电池）的关键策略。除了受合成困难和浓度限制的典型掺杂策略外，还非常需要创新地引入稀土。本文介绍了一种新颖的合成策略，该方法通过为镍铁铬铬氢氧化物（NFC）引入CeO ₂载体来增强氧释放反应（OER）性能，从而在10 mA cm ^-2的条件下实现230.8 mV的超低超电势， Tafel斜率为32.7 mV dec ^-1以及在碱性溶液中的出色耐久性。密度泛函理论计算证明了通过NFC和CeO ₂之间的相互作用建立的d - f电子阶梯，显然促进了高速电子传递。同时，CeO _2中稳定的价态保持了OER的高电子反应性。这项工作展示了一种有前途的方法，可通过稀土氧化物的合成来制备非贵金属的OER电催化剂，以达到优异的活性和高稳定性。

更新日期：2020-02-26

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