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首页> 外文期刊>Applied Surface Science >CoS nanowires mediated by superionic conductor Ag_2S for boosted oxygen evolution
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CoS nanowires mediated by superionic conductor Ag_2S for boosted oxygen evolution

机译：COS纳米线被用于升压氧气进化的超前导体AG_2S介导

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摘要

Oxygen evolution reaction (OER) is an important semi-reaction involved in water splitting and metal-air battery devices. Considering the high activity of CoS for OER and the superionic conductor characteristics of Ag2S, Co-Ag sulfide catalyst was synthesized by a simple solvothermal method. Small amounts of Ag2S species in the reaction system mediates the formation of CoS nanowires, which is in contrast to irregular particles obtained without Ag2S. Ag2S species with superionic conductor characteristics acing as a catalyst induces the growth of CoS nanowires via a non-typical solution-liquid-solid mechanism. The thus formed Ag+ mediated CoS nanowires show improved electrical conductivity and prominent catalytic activity, and only requires an overpotential of 293 mV to provide a current density of 10 mA cm(-2) with Tafel slope of 55.3 dec(-1). In addition, the catalytic activity can maintain in the i-t WA for at least 30 h. The derivation of this OER catalyst after OER operation was examined, which indicates that Ag- and S- codoped CoOOH is formed on the catalyst surface after OER operation that acts as catalytic active phase for OER.
机译：氧气进化反应（oer）是涉及水分裂和金属电池装置的重要半反应。考虑到OER的COS的高活性和AG2S的表面传导特性，通过简单的溶剂热法合成共g硫化物催化剂。反应体系中的少量Ag2S物种介导COS纳米线的形成，其与没有Ag2s获得的不规则颗粒相反。作为催化剂的具有超前导体特性的Ag2S物种，作为催化剂通过非典型的溶液 - 固体机制诱导COS纳米线的生长。由此形成的Ag +介导的COM纳米线显示出​​改善的电导率和突出的催化活性，并且仅需要293mV的过电位，以提供55.3CC（-1）的Tafel斜率的电流密度为10 mA cm（-2）。另外，催化活性可以在I-T WA中保持至少30小时。检查oer操作后该陶氏催化剂的衍生，这表明在oer操作后在催化剂表面上形成Ag和S-编码的CoOH，其作用为oer的催化活性相。

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