首页|A hybrid nickel/iron-pyromellitic acid electrocatalyst for oxygen evolution reaction
A hybrid nickel/iron-pyromellitic acid electrocatalyst for oxygen evolution reaction
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NETL
NSTL
万方数据
The migration of protons during the oxygen evolution reaction(OER)is a key factor that affects the performance of OER catalysts.To enhance proton transportation,we designed a catalyst based on nickel/iron-pyromellitic acid(NiFe-PMA)prepared by the electrochemical deposition method.This catalyst exhibited a low overpotential of 188 mV at a current density of 10 mA·cm-2,a Tafel slope of 28.2 mV·dec-1,and long-term stability for 30 days with a current of 50 mA·cm-2.We characterized the NiFe-PMA catalyst using various techniques,including Fourier transform infrared(FTIR)spectroscopy,Raman spectroscopy,X-ray photoelectron spectroscopy(XPS),X-ray absorption spectroscopy(XAS),transmission electron microscopy(TEM),scanning electron microscopy(SEM),and inductively coupled plasma-optical emission spectrometry(ICP-OES).Our results showed that NiFe-PMA contains nickel,iron atoms,and both coordinated and uncoordinated carboxylate groups.Additionally,XPS data confirmed that carboxylate ligands could adjust the outer electronic structure of metal ions,resulting in the high valence state of Ni in NiFe-PMA.The result of XAS indicated that the nickel atoms present in the catalyst might be easier to maintain a higher chemical state.Further investigations using kinetic isotope effects(KIEs)and proton inventory revealed that the uncoordinated carboxylic protons played a crucial role in receiving protons during the OER,which promoted the proton transfer of the rate-determining step of the OER.Our novel electrocatalysts provide a new strategy for designing more active and cost-effective catalysts for the OER.
School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China
Center for Transformative Science,ShanghaiTech University,Shanghai 201210,China
State Key Lab of Fine Chemicals,Institute of Artificial Photosynthesis,DUT-KTH Joint Education and Research Center on Molecular Devices,Dalian University of Technology(DUT),Dalian 116024,China
State Key Laboratory of Functional Materials for Informatics,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China
展开 >
National Key Research and Development Program of Ministry of Science and Technology of ChinaShanghaiTech University startup fundingAnalytical Instrumentation Center at the School of Physical Science and Technology(SPST),ShanghaiTech UniversityCentre for High-Resolution Electron Microscopy(ChEM)SPST of ShanghaiTech University
NETL
NSTL
万方数据
