文献类型：期刊文献

英文题名：Unraveling the Beneficial Electrochemistry of IrO2/MoO3 Hybrid as a Highly Stable and Efficient Oxygen Evolution Reaction Catalyst

作者：Tariq, Muhammad[1];Zaman, Waqas Qamar[1];Sun, Wei[1];Zhou, Zhenhua[1];Wu, Yiyi[1];Cao, Li-mei[1];Yang, Ji[1]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Sch Resources & Environm Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2018

卷号：6

期号：4

起止页码：4854

外文期刊名：ACS SUSTAINABLE CHEMISTRY & ENGINEERING

收录：;EI(收录号：20181404983813);WOS:【SCI-EXPANDED(收录号:WOS:000429285800047)】；

基金：This research is based on work supported by the National Natural Science Foundation of China (51778229). We would like to thank beamline BL14W1 (Shanghai Synchrotron Radiation Facility) for providing the beam time.

语种：英文

外文关键词：Water electrolysis; Iridium oxide; Electrocatalyst; Mixed oxide composite; Molybdenum oxide; Oxygen evolution reaction; Water splitting

摘要：Minimization of noble metal contents along with enhancement in electrochemical properties with high durability is a major challenge to be overcome for commercializing water electrolyzers and cheap energy storage devices. Sluggish kinetics of the oxygen evolution reaction (OER) within the electrolytic cell and high energy demand to form O=O bonds have attracted more responsiveness to this area. We report the OER beneficial mixed oxide composite of molybdenum and iridium oxides by a facile hydrothermal method. Adhered IrO2 nanoparticles on MoO3 large particles synergistically possessed a robust nature toward harsh acidic water electrolysis as compared to an alkaline environment. Mass specific OER activity of iridium active centers was greatly enhanced by 7-fold, twice the current density, and was attributed to electronic modulation of noble metal. Enhanced surface area and the existence of highly oxidative species in the O(1s) spectrum of IrO2 and two doublet regions in the X-ray photoelectron spectrum of molybdenum metal were found, accountable for the robust performance. Prepared composite possessing only 30% molar fraction of noble metal presented an excellent long-term stability for 40 000 s. Reduction in the Tafel slope from 57 to 77 mV dec(-1) for IM-30 and IrO2 respectively was observed. The conducted research will open up new avenues for more applications of molybdenum oxides and their derivatives for water splitting.