Dealloyed Silver Nanoparticles as Efficient Catalyst Towards Oxygen Reduction in Alkaline Solution

作     者：CUI Qinghua ZHANG Yelong PENG Zhangquan 

作者机构：State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changehun 130022 P. R. China University of Chinese Academy of Sciences Beijing 100049 P. R. China 

出 版 物：《Chemical Research in Chinese Universities》 (高等学校化学研究（英文版）)

年 卷 期：2016年第32卷第1期

页      面：106-111页

核心收录：

学科分类：081704[工学-应用化学] 0808[工学-电气工程] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：Supported by the Strategic Priority Research Program of the Chinese Academy of Sciences 

主　　题：Silver nanoparticles Electrochemical activity Oxygen reduction reaction 

摘      要：Silver nanoparticles（Ag NPs） were prepared by dealloying Mg-Ag alloy precursor. The obtained Ag NPs have an average ligament size of （50±10） nm. Electrocatalytic activity of Ag NPs towards oxygen reduction reaction（ORR） in 0.1 mol/L NaOH solution was assessed via cyclic voltammetry（CV）, rotating ring disk electrode（RRDE） techniques, and electrochemical impedance spectroscopy（EIS）. The electrochemical active area for the ORR was evaluated by means of the charge of the underpotential deposition（UPD） of lead（Pb） on Ag NPs. The CV results in- dicate that Ag NPs have a higher current density and more positive onset potential than the bulk Ag electrode. RRDE was employed to determine kinetic parameters for O2 reduction. Ag NPs exhibit a higher kinetic current density of 25.84 mA/cm2 and a rate constant of 5.45× 10^-2 cm/s at -0.35 V vs. Hg/HgO. The number of electrons（n） involved in ORR is close to 4. Further, EIS data show significantly low charge transfer resistances on the Ag NPs electrode. The results indicate that the prepared Ag NPs have a high activity and are promising catalyst for ORR in alkaline solution.