Coupling of ultrasmall and small CoxP nanoparticles confined in porous SiO2 matrix for a robust oxygen evolution reaction  

作　　者：Xiaojun Zeng Haiqi Zhang Xiaofeng Zhang Qingqing Zhang Yunxia Chen Ronghai Yu Martin Moskovits 

机构地区：[1]School of Materials Science and Engineering,Jingdezhen Ceramic University,Jingdezhen,333403,China [2]Guangdong Academy of Science,Guangdong Institute of New Materials,National Engineering Laboratory for Modern Materials Surface Engineering Technology,The Key Lab of Guangdong for Modern Surface Engineering Technology,Guangzhou,510650,China [3]School of Materials Science and Engineering,Beihang University,Beijing,100191,China [4]Department of Chemistry and Biochemistry,University of California Santa Barbara,Santa Barbara,CA,93106,United States

出　　处：《Nano Materials Science》2022年第4期393-399,共7页纳米材料科学（英文版）

基　　金：supported by the Training Program for Academic and Technical Leaders of Major Disciplines in Jiangxi Province(No.20212BCJ23020);the Science and Technology Project of Jiangxi Provincial Department of Education(No.GJJ211305);the National Natural Science Foundation of China(No.51671010);the National University Students Innovation and Entrepreneurship Training Program(No.202110408005)。

摘　　要：Rational design of electrocatalysts is important for a sustainable oxygen evolution reaction(OER).It is still a huge challenge to engineer active sites in multi-sizes and multi-components simultaneously.Here,a series of CoxP nanoparticles(NPs)confined in an SiO2matrix(SiO2/CoxP)is designed and synthesized as OER electrocatalysts.The phosphorization of the hydrolyzed Co-phyllosilicate promotes the formation of ultrasmall and small Co2P and CoP.These are firmly confined in the SiO2matrix.The coupling of multi-size and multi-component CoxP catalysts can regulate reaction kinetics and electron transfer ability,enrich the active sites,and eventually promote the intrinsic OER activity.The SiO2matrix provides abundant porous structure and oxygen vacancies,and these facilitate the exposure of active sites and improve conductivity.Because of the synergy and interplay of multisized/component CoxP NPs and the porous SiO2matrix,the unique SiO2/CoxP heterostructure exhibits low overpotential(293 m V@10 mA cm-2),and robust stability(decay 12 mV after 5000 CV cycles,97.4%of initial current after 100 h chronoamperometric)for the OER process,exceeding many advanced metal phosphide electrocatalysts.This work provides a novel tactic to design low-cost,simple,and highly efficient OER electrocatalysts.

关 键 词：Multi-size MULTI-COMPONENT PHYLLOSILICATE SiO2/CoxP heterostructure OER 

分 类 号：TQ426[化学工程]