Pd-decorated three-dimensional nanoporous Au/Ni foam composite electrodes for H2O2 reduction

Xi Ke; Yantong Xu; Changchun Yu; Jie Zhao; Guofeng Cui; Drew Higgins; Zhongwei Chen; Qing Li; Hui Xu; Gang Wu

doi:10.1039/C4TA02586E

Pd-decorated three-dimensional nanoporous Au/Ni foam composite electrodes for H₂O₂ reduction

Xi Ke,^a Yantong Xu,^a Changchun Yu,^b Jie Zhao,^b Guofeng Cui,*^a Drew Higgins,^cd Zhongwei Chen,^d Qing Li,^c Hui Xu^c and Gang Wu^ce

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* Corresponding authors

^a Electronic Packaging Electrochemistry Laboratory, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, China
E-mail: cuigf@mail.sysu.edu.cn

^b School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, China

^c Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

^d Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada

^e Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, USA

Abstract

Nanoporous gold (NPG) films were fabricated on Ni foam substrates via a two-step procedure which involves electrodeposition of Au–Sn alloy films on the Ni foam surface, followed by selectively leaching the Sn component through a chemical dealloying process. Pd nanoparticles were then electrochemically deposited on the NPG/Ni foam electrode. The morphology of the Pd-decorated NPG/Ni foam composite electrode (Pd@NPG/Ni foam) was characterized by scanning electron microscopy (SEM). The catalytic activity of the Pd@NPG/Ni foam composite electrode toward H₂O₂ electroreduction in acid media was evaluated by means of linear scan voltammetry and chronoamperometry. The Pd@NPG/Ni foam composite electrode exhibited high activity and excellent stability for the H₂O₂ electroreduction, generating a current density of 178 mA cm⁻² at 0 V in a 0.5 M H₂SO₄ + 0.6 M H₂O₂ electrolyte, in comparison to 98 mA cm⁻² on the Pd@Ni foam electrode and 36 mA cm⁻² on the NPG/Ni foam electrode. The developed three-dimensional (3D) hierarchical porous Pd@NPG/Ni foam can therefore be considered as a promising type of electrode for fuel cell applications.

Journal of Materials Chemistry A

Pd-decorated three-dimensional nanoporous Au/Ni foam composite electrodes for H₂O₂ reduction

Abstract

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Pd-decorated three-dimensional nanoporous Au/Ni foam composite electrodes for H₂O₂ reduction

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