Dendritic Ag@Pt core-shell catalyst modified with reduced graphene oxide and titanium dioxide: Fabrication, characterization, and its photo-electrocatalytic performance

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• 作者：Caiqin Wang^a ; Ruirui Yue^a ; Huiwen Wang^a ; ^b ; Cuie Zou^a ; Jiao Du^a ; ^b ; Fengxing Jiang^a ; Yukou Du^a ; ^{duyk@suda.edu.cn" class="auth_mail} ; Ping Yang^a ; Chuanyi Wang^b ; ^{cywang@ms.xjb.ac.cn" class="auth_mail}
• 关键词：Photo-electrocatalytic oxidation ; Methanol oxidation ; Ag@Pt bimetallic dendrite ; Titanium dioxide
• 刊名：International Journal of Hydrogen Energy
• 出版年：4 April, 2014
• 年：2014
• 卷：39
• 期：11
• 页码：5764-5771
• 全文大小：1786 K

文摘

A facile, multi-step method has been developed for the fabrication of three-dimensional (3D) RGO/Ag@Pt/TiO₂/CF electrode, which is composed of dendritic Ag@Pt core-shell catalyst, reduced graphene oxide (RGO), TiO₂ spheres, and carbon fiber (CF). The Ag@Pt dendrite and TiO₂ spheres supported on CF are coated with the gauze-like RGO sheets. After complexing with RGO, the light absorption of RGO/Ag@Pt/TiO₂/CF is extended to longer wavelength region in comparison with pure TiO₂. Moreover, the photo-electrocatalytic performance of RGO/Ag@Pt/TiO₂/CF electrode toward methanol oxidation is thoroughly studied by evaluating these factors including electrochemical activity surface area, peak current density, the poisoning tolerance against CO_ads and long-term stability. The results demonstrate that photo-electrocatalytic performance of RGO/Ag@Pt/TiO₂/TiO₂/CF electrode is enhanced under the UV irradiation in comparison with widely used Pt/C-JM electrode and its counterpart, Ag@Pt/TiO₂/CF electrode.