Two-dimensional PtPb-PbS heterostructure enables improved kinetics and highlighted bifunctional antipoisoning for methanol electrooxidation  

作　　者：Liangbin Liu Chongyang Tang Lingzheng Bu Xiangheng Xiao Xiaoqing Huang 

机构地区：[1]State Key Laboratory of Physical Chemistry of Solid Surfaces,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen,361005,China [2]School of Physics and Technology,Wuhan University,Wuhan,430072,China

出　　处：《Science China Chemistry》2022年第6期1112-1121,共10页中国科学（化学英文版）

基　　金：supported by the Ministry of Science and Technology of China (2017YFA0208200, 2016YFA0204100);the National Natural Science Foundation of China (22025108);the Start-Up support from Xiamen University。

摘　　要：Two-dimensional(2 D) platinum(Pt)-based nanomaterials are considered as the ideal fuel cell catalysts, while their rational synthesis associated with phase control remains a formidable challenge. Herein, we firstly design the novel 2 D Pt-lead-sulphur heterophased nanosheets(Pt Pb S HPNSs) as efficient high-toleration electrocatalysts for methanol oxidation reaction(MOR).They exhibit much higher activity and more highlighted bifunctional antipoisoning abilities than Pt Pb NSs and commercial Pt/C.Further density functional theory(DFT) simulation verifies that the decreased electron density of Pt sites worked by Pb and S makes CO intermediate favorable to desorb, avoiding the formation of CO*-polluted Pt sites. Simultaneously, this heterophased interface effectively weakens the adsorption of S^(2-)-species and improves the S-poisoning tolerance, showing a route to realize nearly innoxious catalysis. The present work highlights the importance of heterophase control in tuning antipoisoning property for 2 D Pt-based nanomaterials, which is key for the rational design of efficient fuel cell anodic catalysts.

关 键 词：TWO-DIMENSIONAL PLATINUM heterophase control methanol oxidation reaction poisoning tolerance 

分 类 号：TM911.4[电气工程—电力电子与电力传动] TB383.1[一般工业技术—材料科学与工程]