Ir single atoms on NiFeZn-LDH matrix for exceptional oxygen evolution reaction  

作　　者：Muhammad Israr Muhammad Humayun Jiaqi Zhang Khadim Shah Xin Tan Chen Chen Yadong Li 

机构地区：[1]Department of Chemistry,Tsinghua University,Beijing 100084,China [2]Energy,Water and Environment Lab,College of Humanities and Science,Prince Sultan University,Riyadh,11586,Saudi Arabia

出　　处：《Nano Research》2024年第8期7039-7044,共6页纳米研究（英文版）

基　　金：supported by the National Key R&D Program of China(No.2021YFF0500500);National Natural Science Foundation of China(Nos.21925202 and U22B2071);Yunnan Provincial Science and Technology Project at Southwest United Graduate School(No.202302AO370017);International Joint Mission on Climate Change and Carbon Neutrality.

摘　　要：To address the sluggish kinetics of the oxygen evolution reaction(OER),a potential approach is to rationally design and fabricate extremely effective single atom catalysts(SACs).Using an appropriate matrix to stabilize single-atom active centers with optimal geometric and electronic structures is crucial for enhancing catalytic activity.Herein,we report the design and fabrication of Ir single atoms on NiFeZn layered double hydroxide(Ir-SAC/NiFeZn-LDH)electrocatalyst for highly efficient and stable OER.It is investigated that the NiFeZn support exhibits abundant defect sites and unsaturated coordination sites.These sites function to anchor and stabilize single Ir single atoms on the support.The strong synergetic electronic interaction between the Ir single atoms and the NiFeZn matrix resulted in remarkable OER performance of the as-fabricated Ir-SAC/NiFeZn catalyst.With a loading Ir content of 1.09 wt.%,this catalyst demonstrates a highly stable OER activity,with an overpotential of 196 mV at 10 mA·cm^(−2) and a small Tafel slope of 35 mV·dec^(−1) for the OER in a 1 M KOH solution.These results significantly surpass the performance of the commercially available IrO_(2) catalyst.

关 键 词：Ir single atoms layered double hydroxides rational design geometric optimization oxygen evolution reaction 

分 类 号：O64[理学—物理化学]