Acta Chimica Sinica ›› 2020, Vol. 78 ›› Issue (4): 330-336.DOI: 10.6023/A19110400 Previous Articles     Next Articles



陈莹莹, 刘欢, 程彦, 谢青季   

  1. 湖南师范大学化学化工学院 化学生物学及中药分析教育部重点实验室 长沙 410081
  • 投稿日期:2019-11-12 发布日期:2020-03-12
  • 通讯作者: 谢青季
  • 基金资助:

Preparation of Honeycomb-structured AuPtCu Electrocatalyst by Dynamic Hydrogen Bubble and Sacrificial Cu Templates for Oxidation of Formic Acid

Chen Yingying, Liu Huan, Cheng Yan, Xie Qingji   

  1. Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research(Ministry of Education of China), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081
  • Received:2019-11-12 Published:2020-03-12
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Nos. 21675050, 21475041 and 21775137), Hunan Lotus Scholars Program (2011) and Foundation of the Science & Technology Department of Hunan Province (No. 2016SK2020).

Improving the performance of electrocatalytic formic acid oxidation is the key issue to develop high-performance direct formic acid fuel cells (DFAFC). Pt-based and Pd-based materials are the important electrocatalysts for formic acid oxidation. Micro/nano-porous metal materials are widely concerned in the electrochemistry field due to the high specific electrode-surface area. The dynamic hydrogen bubble template (DHBT) method has been widely used for preparing the three-dimensional honeycomb-like porous nano-metals (3DHPNMs). However, as far as we know, the use of a sacrificial metal template to prepare the 3DHPNMs with improved performance for the electrocatalytic oxidation of small organic molecules has not been reported. Herein, a three-dimensional honeycomb-like porous nano-AuPtCu (3DHPN-AuPtCu) composite was electrodeposited on a gold-plated glassy carbon electrode (Aupla/GCE) by the DHBT method, followed by anodic stripping of Cu to yield a 3DHPN-AuPtCu/Aupla/GCE. The relevant modified electrodes were characterized by cyclic voltammetry (CV), metallographic microscopy, scanning electron microscopy (SEM), energy dispersive spectroscopy and inductively coupled plasma-atomic emission spectrometry. The SEM results clearly revealed that the use of the sacrificial Cu template can modulate the metal-honeycomb structure, and the 3DHPN-AuPtCu/Aupla/GCE can thus possess the better micro/nano-porous structure and the improved electrocatalytic performance than a Cu-template-free 3DHPN-AuPt/Aupla/GCE. In our opinion, the simultaneous electrodeposition of Cu can intervene in the electrodeposition of Au and Pt, and thus a new structure with more active sites exposed and the electrocatalysis performance improved can be obtained after the anodic stripping of electrodeposited Cu. As a result, the 3DHPN-AuPtCu/Aupla/GCE exhibited high anti-poisoning nature and high stability, because many discontinuous Pt atoms on this electrode can suppress the formation of adsorption-state COads during the electrocatalytic oxidation of formic acid. The electrocatalytic oxidation peak current density on 3DHPN-AuPtCu/Aupla/GCE in 0.5 mol/L aqueous H2SO4 containing 0.2 mol/L HCOOH was 12.5 mA·cmPt-2 (CV, -0.3~1.0 V, 50 mV/s), which is superior to the control electrodes and many reported Pt-based electrocatalysis electrodes. The suggested double- template method for preparing honeycomb-structured micro/nano-porous metal materials with improved performance has the potential for wider electrocatalysis and electroanalysis applications.

Key words: dynamic hydrogen bubble template, sacrificial Cu template, honeycomb-structured AuPtCu electrocatalyst, formic acid oxidation