物理化学学报2023，Vol.39Issue(10)：113-119,7.DOI:10.3866/PKU.WHXB202305034
在4H晶相Au纳米带上外延生长非常规晶相4H-Pd基合金纳米结构用于高效甲醇电催化氧化
Epitaxial Growth of Unconventional 4H-Pd Based Alloy Nanostructures on 4H-Au Nanoribbons towards Highly Efficient Electrocatalytic Methanol Oxidation
摘要
Abstract
Direct methanol fuel cells(DMFCs)hold great promise as clean energy conversion devices in the future.Noble metal nanocatalysts,renowned for their exceptional catalytic activity and stability,play a crucial role in DMFCs.Among these catalysts,Pt-and Pd-based nanocatalysts are widely recognized as the most effective catalysts for the electrochemical methanol oxidation reaction(MOR),which is the key half-cell reaction in DMFCs.However,due to the high cost of Pt-and Pd-based materials,there is a strong desire to further enhance their catalytic performance.One of the most promising approaches for it is to develop noble metal-based alloy nanocatalysts,which have shown great potential in improving electrocatalytic activity.Notably,advancements in phase engineering of nanomaterials(PEN)have revealed that noble metal-based nanomaterials with unconventional phases exhibit superior catalytic properties in various catalytic reactions compared to their counterparts with conventional phases.To obtain noble metal-based nanocatalysts with unconventional crystal phases,wet-chemical epitaxial growth has been employed as a facile and effective method,utilizing unconventional-phase noble metal nanocrystals as templates.Nevertheless,epitaxially growing bimetallic alloy nanostructures with unconventional crystal phases remains a challenge,impeding further exploration of their catalytic performance in electrochemical reactions such as MOR.In this study,we utilize 4H hexagonal phase Au(4H-Au)nanoribbons as templates for the epitaxial growth of unconventional 4H hexagonal PdFe,PdIr,and PdRu,resulting in the formation of 4H-Au@PdM(M=Fe,Ir,and Ru)core-shell nanoribbons.As a proof-of-concept application,we investigate the electrocatalytic activity of the synthesized 4H-Au@PdFe nanoribbons towards MOR,which exhibit a mass activity of 3.69 A·mgPd-1,i.e.,10.5 and 2.4 times that of Pd black and Pt/C,respectively,placing it among the best Pd-and Pt-based MOR electrocatalysts.Our strategy opens up an avenue for the rational construction of unconventional-phase multimetallic nanostructures to explore their phase-dependent properties in various applications.关键词
纳米材料相工程/晶相/4H相/Pd基合金/甲醇氧化反应Key words
Phase engineering of nanomaterials/Crystal phase/4H phase/Pd-based alloy/Methanol oxidation reaction分类
化学引用本文复制引用
汪婕,胡兆宁,陈博,范战西,谷林,张华,刘贵高,韵勤柏,周希琛,刘效治,陈也,程洪飞,葛一瑶,黄京韬..在4H晶相Au纳米带上外延生长非常规晶相4H-Pd基合金纳米结构用于高效甲醇电催化氧化[J].物理化学学报,2023,39(10):113-119,7.基金项目
The project was supported by the Research Grants Council of Hong Kong(11301721,TRS(T23-713/22-R)-Carbon Neutrality),ITC via the Hong Kong Branch of National Precious Metals Material Engineering Research Center(NPMM),and the City University of Hong Kong(9380100,7020054,9678272,7020013,1886921).香港研究资助局(11301721,TRS(T23-713/22-R)-碳中和),创新科技署国家贵金属材料工程研究中心香港分中心(NPMM)以及香港城市大学(9380100,7020054,9678272,7020013,1886921)资助项目 （11301721,TRS(T23-713/22-R）
