Constructing high coordination number of Ir-O-Ru bonds in IrRuO_(x)nanomeshes for highly stable acidic oxygen evolution reaction  

作　　者：Ge Yu Ruilong Li Yida Zhang Xingen Lin Gongming Wang Xun Hong 

机构地区：[1]Center of Advanced Nanocatalysis(CAN),Department of Applied Chemistry,University of Science and Technology of China,Hefei 230026,China [2]National Synchrotron Radiation Laboratory(NSRL),University of Science and Technology of China,Hefei 230029,China

出　　处：《Nano Research》2024年第6期5073-5079,共7页纳米研究（英文版）

基　　金：The National Key Research and Development Program of China(Nos.2018YFA0702001 and 2021YFA1500400);the National Natural Science Foundation of China(Nos.22371268 and 22175163);Fundamental Research Funds for the Central Universities(No.WK2060000016);Anhui Development and Reform Commission(No.AHZDCYCX-2SDT2023-07);Youth Innovation Promotion Association of the Chinese Academy of Science(No.2018494)supported this work.

摘　　要：IrRu bimetallic oxides are recognized as the promising acidic oxygen evolution reaction(OER)catalysts,but breaking the trade-off between their activity and stability is an unresolved question.Meanwhile,addressing the issues of mass transport obstruction of IrRu bimetallic oxides under high current remains a challenge for the development of proton exchange membrane water electrolysis(PEM-WE).Herein,we prepared an IrRuO_(x)nanomeshes(IrRuO_(x)NMs)with high coordination number(CN)of Ir-O-Ru bonds in a mixed molten salt with high solubility of the Ir/Ru precursor.X-ray absorption spectroscopy analysis revealed that the IrRuO_(x)NMs possess high coordination number of Ir-O-Ru bonds(CNIr-O-Ru=5.6)with a distance of 3.18Å.Moreover,the nanomesh structures of IrRuO_(x)NMs provided hierarchical channels to accelerate the transport of oxygen and water,thus further improving the electrochemical activity.Consequently,the IrRuO_(x)NMs as OER catalysts can simultaneously achieve high activity and stability with low overpotential of 196 mV to reach 10 mA·cm^(−2)and slightly increase by 70 mV over 650 h test.Differential electrochemical mass spectrometry tests suggest that the preferred OER mechanism for IrRuO_(x)NMs is the adsorbent evolution mechanism,which is beneficial for the robust structural stability.

关 键 词：oxygen evolution reaction IrRuO_(x) Ir-O-Ru bonds two-dimensional(2D)nanomesh proton exchange membrane device mass transport 

分 类 号：O64[理学—物理化学]