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Electrosynthesis of CuO Nanocrystal Array as a Highly Efficient and Stable Electrocatalyst for Oxygen Evolution Reaction
MaMingming
Author NameAffiliationE-mail
MaMingming CAS Key Laboratory of Soft Matter Chemistry, iChEM (Innovation Center of Chemistry for Energy Materials), Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China mma@ustc.edu.cn 
Abstract:
Electrodeposition of active catalysts on electrodes appears as a convenient approach to prepare non-noble-metal based electrocatalysts with defined micro- and nano- structures. Herein we report a new strategy of fabricating a 3-D hierarchical CuO nanocrystal array (CuO NCA) on Cu foam through a two-step sacrifice-template method. This CuO NCA possesses high conductivity, great stability and impressive catalytic activity for oxygen evolution reaction (OER) in alkaline electrolytes. The CuO NCA can achieve a high current density of 100 mA/cm2 at a relatively low overpotential of 400 mV for OER, which shows a better performance than other Cu-based OER catalysts and IrO2. The high activity of CuO NCA is well retained during a 10-h OER test at a high current density around 270 mA/cm2, which is about 10 times higher than the current density achieved by IrO2 (around 25 mA/cm2) with the same applied overpotential. According to our best knowledge, CuO NCA is currently the most efficient and stable Cu-based electrocatalyst for water oxidation in alkaline electrolytes.
Key words:  Nano catalyst, Copper oxide, Oxygen evolution reaction
FundProject:
铜纳米阵列高效电解水产氧催化剂的制备
MaMingming
摘要:
电沉积法是制备非贵金属纳米材料的一种非常便捷的方法。本文报道了一种利用简单的两步牺牲模板法,在泡沫铜基底表面完成了三维氧化铜纳米晶阵列的生长。氧化铜纳米晶阵列具有良好的导电性,稳定性,在碱性溶液中有着优秀的电解水产氧催化性能。氧化铜纳米晶阵列催化水的电化学氧化只需400mV的过电势即可达到100 mA/cm2的电流密度,与其它铜基电解水产氧催化剂以及贵金属IrO2相比都有着明显的优势。氧化铜纳米晶阵列在270 mA/cm2左右的工作电流下连续工作10个小时依然可以保持良好的稳定性,是相同的工作电压下IrO2工作电流的十倍(约25 mA/cm2。据我们所知,氧化铜纳米晶阵列是目前应用于碱性水溶液的电化学催化氧化的最高效,最稳定的铜基催化剂。
关键词:  纳米催化剂,氧化铜,电化学产氧
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