Nickel-iron in the second coordination shell boost single-atomicsite iridium catalysts for high-performance urea electrooxidation  

作　　者：Xiaoyu Chen Jiawei Wan Jing Chai Liang Zhang Fang Zhang Qinghua Zhang Lin Gu Lirong Zheng Ranbo Yu 

机构地区：[1]Department of Physical Chemistry,School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]State Key Laboratory of Biochemical Engineering,Key Laboratory of Biopharmaceutical Preparation and Delivery,Chinese Academy of Sciences,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China [3]Center for Combustion Energy,School of Vehicle and Mobility,State Key Laboratory of Intelligent Green Vehicle and Mobility,Tsinghua University,Beijing 100084,China [4]Analysis and Testing Center,Beijing Institute of Technology,Beijing 100081,China [5]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [6]Beijing National Center for Electron Microscopy and Laboratory of Advanced Materials,Department of Materials Science and Engineering,Tsinghua University,Beijing 100084,China [7]Beijing Synchrotron Radiation Facility,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Nano Research》2024年第5期3919-3926,共8页纳米研究（英文版）

基　　金：support from the National Natural Science Foundation of China(Nos.51932001,51872024,52022097,22293043);the National Key Research and Development Program of China(No.2018YFA0703503);the Foundation of the Youth Innovation Promotion Association of Chinese Academy of Sciences(No.2020048)。

摘　　要：Single-atom catalysts(SACs)with high catalytic activity as well as great stability are demonstrating great promotion in electrocatalytic energy conversion,which is also a big challenge to achieve.Herein,we proposed a facile synthetic strategy to construct nickel-iron bimetallic hydroxide nanoribbon stabilized single-atom iridium catalysts(Ir-NiFe-OH),where the nickel-iron hydroxide nanoribbon not only can serve as good electronic conductor,but also can well stabilize and fully expose single-atom sites.Adopted as catalyst for urea oxidation reaction(UOR),it exhibited excellent UOR performance that it only needed a low operated potential of 1.38 V to achieve the current density of 100 mA·cm^(-2).In-situ Fourier transform infrared spectroscopy,X-ray absorption spectrum,and density functional theory calculations proved that Ir species are active centers and the existence of both Ni and Fe in the local structure of Ir atom can optimize the d-band center of Ir species,promoting the adsorption of intermediates and desorption of products for UOR.The hydrogen evolution reaction(HER)/UOR electrocatalytic cell demanded voltages of 1.46 and 1.50 V to achieve 50 and 100 mA·cm^(-2),respectively,which demonstrated a higher activity and better stability than those of conventional catalysts.This work opens a new avenue to develop catalysts for UORs with boosted activity and stability.

关 键 词：SINGLE-ATOM IRIDIUM coordinate structure NANORIBBON urea electrooxidation 

分 类 号：O64[理学—物理化学]