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Co(OH)2 Nanoparticle‐Encapsulating Conductive Nanowires Array: Room‐Temperature Electrochemical Preparation for High‐Performance Water Oxidation Electrocatalysis
Advanced Materials ( IF 27.4 ) Pub Date : 2018-01-15 , DOI: 10.1002/adma.201705366 Dan Wu 1 , Yicheng Wei 1 , Xiang Ren 1 , Xuqiang Ji 2 , Yiwei Liu 2 , Xiaodong Guo 3 , Zhiang Liu 4 , Abdullah M. Asiri 5 , Qin Wei 1 , Xuping Sun 1, 2
Advanced Materials ( IF 27.4 ) Pub Date : 2018-01-15 , DOI: 10.1002/adma.201705366 Dan Wu 1 , Yicheng Wei 1 , Xiang Ren 1 , Xuqiang Ji 2 , Yiwei Liu 2 , Xiaodong Guo 3 , Zhiang Liu 4 , Abdullah M. Asiri 5 , Qin Wei 1 , Xuping Sun 1, 2
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It is highly desired but still remains challenging to design and develop a Co‐based nanoparticle‐encapsulated conductive nanoarray at room temperature for high‐performance water oxidation electrocatalysis. Here, it is reported that room‐temperature anodization of a Co(TCNQ)2 (TCNQ = tetracyanoquinodimethane) nanowire array on copper foam at alkaline pH leads to in situ electrochemcial oxidation of TCNQ− into water‐insoluable TCNQ nanoarray embedding Co(OH)2 nanoparticles. Such Co(OH)2‐TCNQ/CF shows superior catalytic activity for water oxidation and demands only a low overpotential of 276 mV to drive a geometrical current density of 25 mA cm−2 in 1.0 m KOH. Notably, it also demonstrates strong long‐term electrochemical durability with its activity being retrained for at least 25 h, a high turnover frequency of 0.97 s−1 at an overpotential of 450 mV and 100% Faradic efficiency. This study provides an exciting new method for the rational design and development of a conductive TCNQ‐based nanoarray as an interesting 3D material for advanced electrochemical applications.
中文翻译：
Co（OH）2纳米粒子包裹导电纳米线阵列：高性能水氧化电催化的室温电化学制备
高度期望，但在室温下设计和开发用于高性能水氧化电催化的基于Co的纳米颗粒包封的导电纳米阵列仍然具有挑战性。在此，据报道，一钴室温阳极氧化（TCNQ）2（TCNQ =甲烷）纳米线对铜泡沫阵列在碱性pH导致原位electrochemcial TCNQ的氧化-成水不可溶性TCNQ纳米阵列嵌入的Co（OH）2个纳米粒子。此类Co（OH）2 -TCNQ / CF对水氧化显示出优异的催化活性，仅需276 mV的低过电势即可在1.0 m内驱动25 mA cm -2的几何电流密度KOH。值得一提的是，它还具有很强的长期电化学耐久性，其活性至少经过25 h的再训练，在450 mV的超电势和100％的法拉第效率下具有0.97 s -1的高周转频率。这项研究为合理设计和开发基于导电TCNQ的纳米阵列提供了一种令人兴奋的新方法，该纳米阵列是用于高级电化学应用的有趣3D材料。
更新日期：2018-01-15
中文翻译：
Co（OH）2纳米粒子包裹导电纳米线阵列：高性能水氧化电催化的室温电化学制备
高度期望，但在室温下设计和开发用于高性能水氧化电催化的基于Co的纳米颗粒包封的导电纳米阵列仍然具有挑战性。在此，据报道，一钴室温阳极氧化（TCNQ）2（TCNQ =甲烷）纳米线对铜泡沫阵列在碱性pH导致原位electrochemcial TCNQ的氧化-成水不可溶性TCNQ纳米阵列嵌入的Co（OH）2个纳米粒子。此类Co（OH）2 -TCNQ / CF对水氧化显示出优异的催化活性，仅需276 mV的低过电势即可在1.0 m内驱动25 mA cm -2的几何电流密度KOH。值得一提的是，它还具有很强的长期电化学耐久性，其活性至少经过25 h的再训练，在450 mV的超电势和100％的法拉第效率下具有0.97 s -1的高周转频率。这项研究为合理设计和开发基于导电TCNQ的纳米阵列提供了一种令人兴奋的新方法，该纳米阵列是用于高级电化学应用的有趣3D材料。
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