首页|Toward a comprehensive hypothesis of oxygen-evolution reaction in the presence of iron and gold

Toward a comprehensive hypothesis of oxygen-evolution reaction in the presence of iron and gold

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
This study investigates the effects of Fe on the oxygen-evolution reaction(OER)in the presence of Au.Two distinct areas of OER were identified:the first associated with Fe sites at low overpotential(～330 mV),and the second with Au sites at high overpotential(～870 mV).Various factors such as surface Fe concentration,electrochemical method,scan rate,potential range,concentration,method of adding K2FeO4,nature of Fe,and temperature were varied to observe diverse behaviors during OER for FeOxHy/Au.Trace amounts of Fe ions had a significant impact on OER,reaching a saturation point where the activity did not increase further.Strong electronic interaction between Fe and Au ions was indicated by X-ray photoelectron spectroscopy(XPS)and electron paramagnetic resonance(EPR)analyses.In situ visible spectroscopy confirmed the formation of FeO42-during OER.In situ Mössbauer and surface-enhanced Raman spectroscopy(SERS)analyses suggest the involvement of Fe-based species as interme-diates during the rate-determining step of OER.A lattice OER mechanism based on FeOxHy was proposed for operation at low overpotentials.Density functional theory(DFT)calculations revealed that Fe oxide,Fe-oxide clusters,and Fe doping on the Au foil exhibited different activities and stabilities during OER.The study provides insights into the interplay between Fe and Au in OER,advancing the understanding of OER mechanisms and offering implications for the design of efficient electrocatalytic systems.

DFT calculationFe/Au electrocatalysisMechanismOxygen evolutionWater oxidation

Negah Hashemi、Jafar Hussain Shah、Cejun Hu、Subhajit Nandy、Pavlo Aleshkevych、Sumbal Farid、Keun Hwa Chae、Wei Xie、Taifeng Liu、Junhu Wang、Mohammad Mahdi Najafpour

展开 >

Department of Chemistry,Institute for Advanced Studies in Basic Sciences(IASBS),Zanjan 45137-66731,Iran

Center for Advanced Mössbauer Spectroscopy,Mössbauer Effect Data Center,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China

Key Lab of Advanced Energy Materials Chemistry(Ministry of Education),Renewable Energy Conversion and Storage Center,College of Chemistry,Nankai University,Tianjin 300071,China

Advanced Analysis Center,Korea Institute of Science and Technology,Seoul 02792,Republic of Korea

Institute of Physics,Polish Academy of Sciences,Warsaw 02-668,Poland

National and Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials,Henan University,Kaifeng 475004,Henan,China

Center of Climate Change and Global Warming,Institute for Advanced Studies in Basic Sciences(IASBS),Zanjan 45137-66731,Iran

Research Center for Basic Sciences & Modern Technologies(RBST),Institute for Advanced Studies in Basic Sciences(IASBS),Zanjan 45137-66731,Iran

展开 >

National Elite FoundationInstitute for Advanced Studies in Basic SciencesNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

221730262235041038622375200U22A20217521961142006

2024

10.1016/j.jechem.2023.09.033

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)
  • 90