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The rapid self-reconstruction of Fe-modified Ni hydroxysulfide for efficient and stable large-current-density water/seawater oxidation
Energy & Environmental Science ( IF 32.5 ) Pub Date : 2022-09-14 , DOI: 10.1039/d2ee01478e
Chuqiang Huang, Qiancheng Zhou, Dingshuo Duan, Luo Yu, Wei Zhang, Zhouzhou Wang, Jin Liu, Bowen Peng, Pengfei An, Jing Zhang, Liping Li, Jiaguo Yu, Ying Yu

The reasonable design of electrocatalysts with rapid self-reconstruction for an efficient oxygen evolution reaction (OER) at commercially required current densities is highly desirable but very challenging. Herein, ultrathin Fe-modified Ni hydroxysulfide (Fe–NiSOH) nanosheet arrays were grown in situ on Ni foam via a simple two-step oxidation strategy for efficient and stable large-current-density water/seawater oxidation. Systematic insights, including experimental and theoretical analysis, reveal that in situ S leaching from the electrode boosts its self-reconstruction and results in the more-ready generation of highly active Ni4+ species, which benefits from a reduced formation energy. Owing to its excellent physical and chemical properties, the Fe–NiSOH catalyst requires only low overpotentials of 207, 240, and 268 mV in alkaline water to deliver current densities of 10, 100, and 500 mA cm−2, respectively, and it can work stably for 1100 hours at the commercially required current density of 500 mA cm−2. Furthermore, it also exhibits excellent seawater oxidation activity and superior resistance to Cl corrosion, since it can run stably at 500 mA cm−2 for over 900 hours. This work offers an efficient strategy to build rapidly self-reconstructing electrocatalysts to promote the formation of highly oxidized metal species for efficient and stable water/seawater oxidation.

中文翻译:

Fe修饰的Ni羟基硫化物的快速自重构用于高效稳定的大电流密度水/海水氧化

在商业所需的电流密度下合理设计具有快速自重构的高效析氧反应(OER)的电催化剂是非常可取的,但也非常具有挑战性。在此,通过简单的两步氧化策略在泡沫镍上原位生长超薄铁改性镍羟基硫化物(Fe-NiSOH)纳米片阵列,以实现高效稳定的大电流密度水/海水氧化。包括实验和理论分析在内的系统见解表明,从电极中原位浸出 S 促进了其自我重建,并导致更容易生成高活性 Ni 4+物种,这得益于降低的形成能。由于其优异的物理和化学性质,Fe-NiSOH 催化剂在碱性水中仅需要 207、240 和 268 mV 的低过电势即可分别提供 10、100 和 500 mA cm -2的电流密度,并且它可以在商业要求的500 mA cm -2电流密度下稳定工作1100小时。此外,它还表现出优异的海水氧化活性和优异的耐 Cl -腐蚀能力,因为它可以在 500 mA cm -2下稳定运行超过900小时。这项工作提供了一种有效的策略来构建快速自重构电催化剂,以促进高度氧化的金属物质的形成,从而实现高效和稳定的水/海水氧化。
更新日期:2022-09-14
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