摘要
与非贵金属形成合金是一种能大幅减少电催化剂中贵金属用量的有效方法,且形成合金有利于催化性能提升.本文引入了一种混合溶剂体系,通过采用高质量铜纳米线作为部分牺牲模板合成了多孔均一、表面粗糙的Pt Au Cu三元纳米管.实验表明金的引入是催化剂甲醇氧化(MOR)和甲酸氧化(FAOR)性能提升的一个关键因素.其MOR和FAOR质量活性分别达到了1698.8 m A mg-1Pt(0.9V)和1170 m A mg-1Pt(0.65V).由于CO*不可逆的吸附在金的表面而非有催化活性的铂表面,这种三元纳米管催化剂表现出了优异的催化稳定性和结构稳定性.此外,这种合成方法可以用于合成其他的新型双功能催化剂.
Forming alloys with transition metal remarkably decreases the u sage of noble metal and offers benefits for electrocatalysis. Here we introduced a mixed-solvent strategy to synthesize unique Pt Au Cu ternary nanotubes(NTs) with porous and rough surface, using high quality Cu nanowires(NWs) as the partial sacrificial templates. We found that Au plays a key role in the enhancement of e lectrocatalytic performance for both methanol oxidation reaction(MOR) and formic acid oxidation reaction(FAOR). The mass activities of Pt Au Cu NTs after acid leaching for MOR and FAOR reach 1698.8 m A mg-1Ptat 0.9 V and 1170 m A mg-1Pt at 0.65 V, respectively. Such ternary NTs show impressive stability due to the irreversibly adsorption of CO* on the Au surface instead of the active Pt surface and the excellent structure stability. The present method could be extended to prepare other new multi-functional electrocatalysts.
基金
supported by the National Natural Science Foundation of China(21431006)
the Foundation for Innovative Research Groups of the National Natural Science Foundation of China(21521001)
the National Basic Research Program of China(2014CB931800 and 2013CB931800)
the Users with Excellence and Scientific Research Grant of Hefei Science Center of CAS(2015HSCUE007 and 2015SRG-HSC038)
the Chinese Academy of Sciences(KJZD-EW-M01-1)
