氧化钨/石墨烯的晶相调控及电催化析氢性能研究  

Research on the phase modulation of tungsten oxide/graphene for electrocatalytic hydrogen evolution

作　　者：陈雪莹 杨军[1] 曹一凡 刘鑫悦 许占位[1] 黄剑锋[1] CHEN Xue-ying;YANG Jun;CAO Yi-fan;LIU Xin-yue;XU Zhan-wei;HUANG Jian-feng(School of Materials Science and Engineering,Shaanxi University of Science&Technology,Xi′an 710021,China)

机构地区：[1]陕西科技大学材料科学与工程学院,陕西西安710021

出　　处：《陕西科技大学学报》2021年第1期126-131,共6页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(21805179);陕西科技大学博士科研启动基金项目(2016QNBJ-09)。

摘　　要：电解水制氢作为可以实现零污染的可靠制氢方式而受到广泛的关注,但贵金属催化剂高昂的成本限制了其商业化的进程,因此寻求可替代的非贵金属催化剂是非常必要的.氧化钨作为一种过渡金属氧化物,在酸性溶液中具有优良的稳定性但其催化活性较低.通过改变氧化钨/石墨烯复合催化剂的烧结温度,实现氧化钨从WO 3到W 18 O 49的晶相调控,采用X射线衍射分析(XRD),扫描电子显微镜(SEM),拉曼光谱(Raman),X射线光电子能谱(XPS)等手段对该复合结构进行了结构表征和转变过程分析,并且在三电极体系下,酸性电解液中测得了相应的电化学性能,其中富含氧缺陷的W 18 O 49/rGO复合催化剂展现出优异的电催化析氢性能.在50 mA/cm 2的电流密度下的过电位仅为240 mV,Tafel斜率为83 mV/dec,并且能够维持7200 s的高效率产氢.Electrocatalytic water splitting,as a reliable zero-pollution approach to produce hydrogen,has received much attention while the cost on precious metal catalysts severely limits its commercialization.Herein,the exploration of replaceable non-precious metal catalysts is significant nowadays.Tungsten oxide,a normal transition oxide,is rather stable in acid media but possesses low catalytic activity.In this work,through the calcination at different temperatures,the phase transition from WO 3 to W 18 O 49 structure has been achieved and further characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),Raman spectra and X-ray photoelectron spectroscopy(XPS)measurements.Besides,in acidic solution,the corresponding performances of the composites have been tested in a three-electrode system.Distinctively,the oxygen vacancies-rich W 18 O 49/rGO catalyst displays remarkable catalytic activity,to produce a current density of 50 mA/cm 2 only requiring an overpotential of 240 mV.The Tafel slope is as low as 83 mV/dec and the high efficiency hydrogen production could be maintained for 7200 s.

关 键 词：三氧化钨 氧化石墨烯 相转变 水分解 催化剂 

分 类 号：TQ151[化学工程—电化学工业]