Preparation and characterisation of carbon-coated Magnéli phase Ti 4 O 7 by modified carbon-thermal reduction route

Micro & nano letters

article

Xinjun Bao¹  Zejie Zhang¹  Shijie Yi¹  Qingshan Yang²  Peng Yu³  Debi Zhou¹ 

[1] School of Chemistry and Chemical Engineering, Central South University;Hunan Nonferrous Metals Vocational and Technical College;College of Science, Hunan Agricultural University

关键词: mesoporous materials;    carbon;    titanium compounds;    electrolytes;    catalysis;    heat treatment;    reduction (chemical);    scanning electron microscopy;    semiconductor materials;    composite materials;    catalysts;    oxygen;    surface chemistry;    high-pressure pelleted treatment;    oxygen reduction reaction catalytic activity;    titanium sulphate;    polyvinyl alcohol;    heat treatment temperature;    carbon-coated Magnéli phase;    carbon-thermal reduction route;    Ti4O7 composite;    carbonthermal reduction;    hydrolysis;    oxide ions;    scanning electron microscopy;    spherical morphology;    mesopore structure;    BET surface area;    electrochemical stability;    alkaline electrolyte;    C-Ti4O7;    O2;   

DOI  :  10.1049/mnl.2019.0725

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

A carbon-coated Magnéli phase Ti 4 O 7 composite has been successfully synthesised, via modified carbonthermal reduction of amorphous TiO 2 , which was prepared from hydrolysis of titanium sulphate and polyvinyl alcohol, at a relatively low temperature and fast reaction rate. Moreover, the effect of heat treatment temperature and time on the reduced phases is revealed. Despite removal of oxide ions, scanning electron microscopic images clearly show the obtained carbon-coated Ti 4 O 7 composite retains well the spherical morphology of the precursor, and the high-pressure pelleted treatment effectively inhibits the growth of the final product during the heat treatment process. In addition, the prepared composite with mesopore structure exhibits a Brunauer, Emmett, and Teller (BET) surface area as high as 84.495 m 2 g −1 and good electrochemical stability in alkaline electrolyte, as well as some oxygen reduction reaction catalytic activity. The results presented in this work open an avenue for its potential electrochemical applications.

【 授权许可】

CC BY|CC BY-ND|CC BY-NC|CC BY-NC-ND