Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, Shandong, China.
College of Chemistry, Sichuan University, Chengdu, 610064, Sichuan, China.
Adv Mater. 2018 Mar;30(9). doi: 10.1002/adma.201705366. Epub 2018 Jan 15.
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) (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) nanoparticles. Such Co(OH) -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 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 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.
设计和开发一种基于 Co 的纳米颗粒封装的室温下的导电纳米阵列，用于高性能水氧化电催化，这是非常需要的，但仍然具有挑战性。在这里，据报道，在碱性 pH 值下，在铜泡沫上对 Co(TCNQ)（TCNQ = 四氰基对醌二甲烷）纳米线阵列进行室温阳极氧化，导致 TCNQ 原位电化学氧化为不溶于水的 TCNQ 纳米阵列，其中嵌入 Co(OH)纳米颗粒。这种 Co(OH)-TCNQ/CF 对水氧化表现出优异的催化活性，仅需 276 mV 的低过电势即可在 1.0 m KOH 中驱动 25 mA cm 的几何电流密度。值得注意的是，它还表现出很强的长期电化学耐久性，其活性至少保持 25 小时，在 450 mV 的过电势下的高周转频率为 0.97 s，法拉第效率为 100%。本研究为合理设计和开发基于 TCNQ 的导电纳米阵列提供了一种令人兴奋的新方法，这种纳米阵列作为一种有趣的 3D 材料，可用于先进的电化学应用。
