首页|Insights into ionic association boosting water oxidation activity and dynamic stability

Insights into ionic association boosting water oxidation activity and dynamic stability

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There have been reports about Fe ions boosting oxygen evolution reaction(OER)activity of Ni-based cat-alysts in alkaline conditions,while the origin and reason for the enhancement remains elusive.Herein,we attempt to identify the activity improvement and discover that Ni sites act as a host to attract Fe(Ⅲ)to form Fe(Ni)(Ⅲ)binary centres,which serve as the dynamic sites to promote OER activity and stability by cyclical formation ofintermediates(Fe(Ⅲ)→ Fe(Ni)(Ⅲ)→ Fe(Ni)-OH → Fe(Ni)-O → Fe(Ni)OOH → Fe(Ⅲ))at the electrode/electrolyte interface to emit 02.Additionally,some ions(Co(Ⅱ),Ni(Ⅱ),and Cr(Ⅲ))can also be the active sites to catalyze the OER process on a variety of electrodes.The Fe(Ⅲ)-catalyzed overall water-splitting electrolyzer comprising bare Ni foam as the anode and Pt/Ni-Mo as the cathode demon-strates robust stability for 1600 h at 1000 mA cm-2@～1.75 V.The results provide insights into the ion-catalyzed effects boosting OER performance.

Oxygen evolution reactionFe(Ⅲ)-catalysisNi-Fe binary active centersIon-catalyzed effectsRobust stability

Zanling Huang、Shuqi Zhu、Yuan Duan、Chaoran Pi、Xuming Zhang、Abebe Reda Woldu、Jing-Xin Jian、Paul K.Chu、Qing-Xiao Tong、Liangsheng Hu、Xiangdong Yao

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Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province,Shantou University,Shantou 515063,Guangdong,China

State Key Laboratory of Refractories and Metallurgy and Institute of Advanced Materials and Nanotechnology,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China

Department of Physics,Department of Materials Science and Engineering,and Department of Biomedical Engineering,City University of Hong Kong,Tat Chee Avenue,Kowloon,Hong Kong,China

Chemistry and Chemical Engineering Guangdong Laboratory,Shantou 515063,Guangdong,China

School of Advanced Energy,Sun Yat-sen University(Shenzhen),Shenzhen 518107,Guangdong,China

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2022 Special Fund Project for Science and Technology Innovation Strategy of Guangdong Province2022 Special Fund Project for Science and Technology Innovation Strategy of Guangdong ProvinceGuangdong Province Universities and Colleges Pearl River Scholar Funded Scheme 2019City University of Hong Kong Strategic Research Grant(SRG)

STKJ202209077STKJ202209083GDUPS20197005505

2024

10.1016/j.jechem.2023.10.036

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.89(2)
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