Crystal phase formation mechanism and electrocatalytical properties of WC/TiO2 nanocomposites

doi:10.11949/j.issn.0438-1157.20160531

CIESC Journal ›› 2016, Vol. 67 ›› Issue (11): 4873-4877.DOI: 10.11949/j.issn.0438-1157.20160531

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Crystal phase formation mechanism and electrocatalytical properties of WC/TiO₂ nanocomposites

WANG Xiaojuan^1,2,3, MAO Xinbiao², LI Guohua², MA Chun'an²

1 Ningbo Academy of Inspection and Quarantine, Ningbo 315012, Zhejiang, China;
2 State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032, Zhejiang, China;
3 Ningbo Entry-Exit Inspection and Quarantine Bureau, Ningbo 315012, Zhejiang, China

Received:2016-04-22 Revised:2016-07-13 Online:2016-11-05 Published:2016-11-05
Supported by:
supported by the Natural Science Foundation of Ningbo Municipality of China (2014A610116), the Program of General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China (2015IK183) and the Open Fund of Breeding Base of Green Chemistry-Synthesis Technology (GCTKF2014004).

WC/TiO₂纳米复合材料晶相形成机理及电催化性能

王晓娟^1,2,3, 毛信表², 李国华², 马淳安²

1 宁波检验检疫科学技术研究院, 浙江宁波 315012;
2 浙江工业大学化学工程与材料学院, 绿色化学合成技术国家重点实验室培育基地, 浙江杭州 310032;
3 宁波出入境检验检疫局, 浙江宁波 315012

通讯作者: 马淳安,science@zjut.edu.cn;毛信表,xbmao@zjut.edu.cn
基金资助:
宁波市自然科学基金项目（2014A610116）；国家质量监督检验检疫总局科技计划项目（2015IK183）；绿色化学合成技术国家重点实验室培育基地开放研究基金项目（GCTKF2014004）。

Abstract

Abstract:

Tungsten carbide and titania (WC/TiO₂) nanocomposites were fabricated by surface modification of rutile titania reacting with ammonium metatungstate and followed by in situ reduction and carburization of the modified rutile in CH₄/H₂ atmosphere. The influence of temperature and time of in situ reduction and carburization on phase structures of WC/TiO₂ nanocomposites were investigated by XRD characterization on nanocomposites, and the formation mechanism of crystal phases in WC/TiO₂ nanocomposites was discussed. The morphology and thermal stability of WC/TiO₂ nanocomposites were studied by SEM and TG-DTA, respectively. Electrocatalytical properties of the WC/TiO₂ nanocomposites with different phase structures were investigated by cyclic voltammetry. Results showed that WC/TiO₂ nanocomposites composed of both WC and TiO₂ crystal phase exhibited the best catalytic activity for p-nitrophenol (PNP) electroreduction.

Key words: tungsten carbide, titania, composites, preparation, p-nitrophenol, electrochemistry

摘要：

以金红石相纳米TiO₂为载体，偏钨酸铵为钨源，采用表面修饰技术制备了纳米复合材料的前体，将前体在甲烷/氢气气氛下还原碳化并采用XRD对其进行表征，研究了还原碳化温度、时间对纳米复合材料晶相组成的影响，并探讨了WC/TiO₂纳米复合材料的形成机理。通过扫描电子显微镜、热重-差热分析等手段对WC/TiO₂纳米复合材料的形态结构和热稳定性进行了表征。采用循环伏安法研究了纳米复合材料物相组成与电催化性能之间的关系，结果表明由WC和TiO₂两相组成的WC/TiO₂纳米复合材料对对硝基苯酚电还原反应的电催化性能最佳。

关键词: 碳化钨, 二氧化钛, 复合材料, 制备, 对硝基苯酚, 电化学

CLC Number:

O646

WANG Xiaojuan, MAO Xinbiao, LI Guohua, MA Chun'an. Crystal phase formation mechanism and electrocatalytical properties of WC/TiO₂ nanocomposites[J]. CIESC Journal, 2016, 67(11): 4873-4877.

王晓娟, 毛信表, 李国华, 马淳安. WC/TiO₂纳米复合材料晶相形成机理及电催化性能[J]. 化工学报, 2016, 67(11): 4873-4877.

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Crystal phase formation mechanism and electrocatalytical properties of WC/TiO₂ nanocomposites

WC/TiO₂纳米复合材料晶相形成机理及电催化性能

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