Insights into the efficiency and stability of Cu-based nanowires for electrocatalytic oxygen evolution
Insights into the efficiency and stability of Cu-based nanowires for electrocatalytic oxygen evolution作者机构：Department of Mechanical Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan Institute of Engineering Innovation The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan School of Materials Science and Engineering Tsinghua University Beijing 100084 China Department of Chemical System Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2018年第11卷第8期
页 面：4323-4332页
核心收录：
学科分类：080801[工学-电机与电器] 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] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 070301[理学-无机化学]
基 金：the Advanced Characterization Nanotechnology Platform of the University of Tokyo supported by "Nanotechnology Platform" of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan supported by JSPS KAKENHI Grant Number the JSPS Core-to-Core program (Advanced Research Networks type A) Japan (JSPS)-Korea (NRF) Bilateral program and Grants-in-Aids for Specially Promoted Research support from China Scholarship Council
主 题：oxygen evolution reaction crystalline CuO active phase copper ion diffusion
摘 要：Copper oxide nanowires with varying oxidation states are prepared and their activity for water oxidation is studied. The nanowires with a CuO phase are found to be the most active, and their degree of crystallinity is important in achieving efficient water oxidation. For the crystalline CuO nanowires in a weakly basic Na2CO3 electrolyte, a Tafel slope of 41 mV/decade, an overpotential of approximately 500 mV at - 10 mA/crn2 （without compensation for the solution resistance）, and a faradaic efficiency of nearly 100% are obtained. This electrode maintains a stable current for over 15 lx The low overpotential of 500 mV at 10 mA/cm2, small Tafel slope, long-term stability, and low cost make CuO one of the most promising catalysts for water oxidation. Moreover, the evolution of the CuO nanowire morphology over time is studied by electron microscop）-revealing that the diffusion of Cu ions from the interior of the nanowires to their surface causes the aggregation of individual nanowires over time. However, despite this aggregation, the current density remains nearly constant, because the total electrochemically active surface area of CuO does not change.
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