A new insight into the promoting effects of transition metal phosphides in methanol electrooxidation  

作　　者：Junjie Ding Shaojie Jing Changqing Yin Chaogang Ban Kaiwen Wang Xue Liu Youyu Duan Yuxin Zhang Guang Han Liyong Gan Jinsong Rao 

机构地区：[1]College of Physics and Center of Quantum Materials and Devices,Chongqing University,Chongqing 401331,China [2]College of Material Science and Engineering,Chongqing University,Chongqing 400044,China [3]Beijing Key Laboratory of Microstructure and Property of Advanced Materials,Beijing University of Technology,Beijing 100024,China

出　　处：《Chinese Chemical Letters》2023年第6期200-205,共6页中国化学快报（英文版）

基　　金：financially supported from the National Natural Science Foundation of China(Nos.12074048 and 12147102);the Project for Fundamental and Frontier Research in Chongqing(No.cstc2020jcyj-msxm X0796);the Fundamental Research Funds for the Central Universities(No.2022CDJXY-002)。

摘　　要：The construction of highly active catalysts for methanol oxidation reaction(MOR)is central to direct methanol fuel cells.Tremendous progress has been made in transition metal phosphides(TMPs)based catalysts.However,TMPs would be partially damaged and transformed into new substances(e.g.,Pt-M-P composite,where M represents a second transition metal)during Pt deposition process.This would pose a large obstacle to the cognition of the real promoting effects of TMPs in MOR.Herein,Co_(2)P co-catalysts(Pt-P/Co_(2)P@NPC,where NPC stands for N and P co-doped carbon)and Pt-Co-P composite catalysts(Pt-CoP/NPC)were controllably synthesized.Electrocatalysis tests show that the Pt-Co-P/NPC exhibits superior MOR activity as high as 1016 m A/mg_(Pt),significantly exceeding that of Pt-P/Co_(2)P@NPC(345 m A/mg_(Pt)).This result indicates that the promoting effect is ascribed primarily to the resultant Pt-Co-P composite,in sharply contrast to previous viewpoint that Co_(2)P itself improves the activity.Further mechanistic studies reveal that Pt-Co-P/NPC exhibits much stronger electron interaction and thus manifesting a remarkably weaker CO absorption than Pt-P/Co_(2)P@NPC and Pt/C.Moreover,Pt-Co-P is also more capable of producing oxygen-containing adsorbate and thus accelerating the removal of surface-bonded CO^(*),ultimately boosting the MOR performance.

关 键 词：Promoting effect Transition metal phosphides Pt-Co-P composite Catalytic mechanisms Methanol oxidation reaction 

分 类 号：O643.36[理学—物理化学] TM911.4[理学—化学]