计时安培法
循环伏安法
介电谱
X射线光电子能谱
材料科学
电催化剂
催化作用
电化学
扫描电子显微镜
铂金
化学工程
无机化学
电极
化学
复合材料
有机化学
物理化学
工程类
作者
Ke Ye,Dongming Zhang,Hongyu Zhang,Kui Cheng,Guiling Wang,Dianxue Cao
标识
DOI:10.1016/j.electacta.2015.07.117
摘要
Pt-modified Co [email protected] sponge (Pt-Co [email protected] sponge) electrode is synthesized via a facile sponge carbonization method coupled with a direct Co electrodeposition and Pt chemical-deposition. The obtained electrodes are characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and transmission electron microscopy (TEM). The catalytic performances of H2O2 electroreduction in alkaline medium are investigated by cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS). The Pt-Co [email protected] sponge electrode exhibits unique nanosheet structure on the three-dimensional (3D) porous network skeleton with a large surface area and displays excellent catalytic performance. The Pt-Co [email protected] sponge electrode achieves a reduction current density of −1.38 A cm−2 mg−1 in 3.0 mol L−1 KOH and 1.5 mol L−1 H2O2 at −0.50 V (vs. Ag/AgCl) accompanied with a desirable stability, which is significantly higher than the catalytic activity of H2O2 electroreduction achieved previously with precious metals as catalysts. The impressive electrocatalytic performance is largely attributed to the superior 3D open structure and high electronic conductivity, which ensures the full utilization of Pt surfaces and makes the electrode have higher electrochemical activity. Original Pt-Co [email protected] sponge electordes have a great potential for the application in fuel cells due to its facile preparation, high performance and low cost.
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