摘要
质子交换膜(proton exchange membrane,PEM)水电解制氢是一种绿色、可持续的氢能制备方法,开发用于阳极析氧反应(oxygen evolution reaction,OER)的、高效经济的电催化剂是实现其大规模商业化应用的关键。通过两步合成法,合成了由不同锰基氧化物作载体的氧化铱催化剂IrO_(x)/Mn_(8)O_(10)C_(l3)、IrO_(x)/β-MnO_(2)和IrO_(x)/α-MnO_(2),铱的质量分数为55%左右。与现有商业IrO_(2)和其他含贵金属的电催化剂相比,合成的氧化铱/锰基氧化物催化剂具有更低的过电位和更高的电流密度。IrO_(x)/β-MnO_(2)在电流密度为10 mA/cm^(2)时过电位仅为228 mV,IrO_(x)/Mn_(8)O_(10)C_(l3)在1.53 V电压下比质量活度达到916.7 A/gIr,析氧反应活性的提升归功于催化剂表面丰富的羟基氧缺陷和IrⅢ物种,丰富的结晶-非晶界面为反应提供了大量活性位点。所提的氧化铱/锰基氧化物为高效经济的酸性OER催化剂的开发提供了新思路。
Proton exchange membrane(PEM)water electrolysis is a green and sustainable method of hydrogen production.The development of efficient and economical electrocatalysts for anodic oxygen evolution reaction(OER)is the key to its large-scale commercialization.Iridium oxide catalysts supported by different manganese based oxide carriers(IrO_(x)/Mn_(8)O_(10)C_(l3),IrO_(x)/β-MnO_(2) and IrO_(x)/α-MnO_(2))were prepared by two-step synthesis method,and the content of iridium is about 55%.Compared with the commercial IrO_(2) and other noble metal containing electrocatalysts,the synthesized catalysts have lower overpotential and higher current density.The overpotential of IrO_(x)/β-MnO_(2) is only 228 mV at the current density of 10 mA/cm^(2).The specific mass activity of IrO_(x)/Mn_(8)O_(10)C_(l3) reaches 916.7 A/gIr at 1.53V.The enhancement of OER activity is attributed to the abundant hydroxyl oxygen defects and IrIII species on the catalyst surface.The rich crystalline-amorphous interface provides a large number of active sites for the reaction.The iridium oxide/manganese based oxide catalysts reported in this paper provide new insights for the development of efficient and economical catalysts for acidic OER.
作者
张舒涵
马晓锋
张芮琳
朱燕群
何勇
王智化
ZHANG Shuhan;MA Xiaofeng;ZHANG Ruilin;ZHU Yanqun;HE Yong;WANG Zhihua(State Key Laboratory of Clean Energy Utilization(Zhejiang University),Hangzhou 310027,Zhejiang Province,China)
出处
《发电技术》
CSCD
2023年第3期340-349,共10页
Power Generation Technology
基金
国家自然科学基金项目(52125605)
中央高校基本科研业务费专项资金资助(2022ZFJH004)。
关键词
质子交换膜水电解
析氧反应
锰基氧化物载体
氧化铱催化剂
proton exchange membrane water electrolysis
oxygen evolution reaction
manganese based oxide carriers
iridium oxide catalysts