Ultrafast synthesis of nanocrystalline spinel oxides by Joule-heating method  

作　　者：Wenxuan Yang Long Shang Xiaomeng Liu Sihan Zhang Haixia Li Zhenhua Yan Jun Chen 

机构地区：[1]State Key Laboratory of Advanced Chemical Power Sources,Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),Frontiers Science Center for New Organic Matter,College of Chemistry,Nankai University,Tianjin 300071,China

出　　处：《Chinese Chemical Letters》2024年第11期517-521,共5页中国化学快报（英文版）

基　　金：supported by the National Programs for NanoKey Project(No.2022YFA1504002);the National Natural Science Foundation of China(Nos.22121005,22020102002,and 21835004);the Fundamental Research Funds for the Central Universities,and Collaborative Innovation Center of Chemical Science and Engineering(Tianjin)。

摘　　要：Spinel oxides,with the formula AB_(2)O_(4)(A and B represent metal ions)perform superior electrocatalytic characteristic when A and B are transition metals like Co,Fe,Mn,etc.Abundant researches have been attached to the structure designments while methods are often energy-intensive and inefficient.Here,we devised a universal strategy to achieve rapid synthesis of nanocrystalline spinel materials with multiple components(Co_(3)O_(4),Mn_(3)O_(4),CoMn_(2)O_(4)and CoFe_(2)O_(4)are as examples),where phase formation is within 15 s.Under the Joule-heating shock,a crack-break process of microcosmic phase transformation is observed by in-situ transmission electron microscopy.The half-wave potential values of Co_(3)O_(4)-JH,Mn_(3)O_(4)-JH,CoMn_(2)O_(4)-JH and CoFe_(2)O_(4)-JH in the electrocatalytic oxygen reduction reaction were 0.77,0.78,0.79 and 0.76,respectively.This suggests that the Joule heating is a fast and efficient method for the preparation of spinel oxide electrocatalysts.

关 键 词：Ultrafast synthesis Spinel oxides Joule-heating In-situ TEM Oxygen reduction 

分 类 号：O643.36[理学—物理化学]