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首页> 外文期刊>Catalysis science & technology >Phosphate-assisted efficient oxygen evolution over finely dispersed cobalt particles supported on graphene
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Phosphate-assisted efficient oxygen evolution over finely dispersed cobalt particles supported on graphene

机译：Phosphate-assisted高效氧进化细分散的钴颗粒支持石墨烯

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摘要

Electrochemical water splitting is a process to store renewable energy in hydrogen, which is a green energy carrier producing only water when combusted. However, the overall electrochemical water splitting is limited by the low efficiency of the anodic oxygen evolution reaction (OER) leading to a high overpotential. In this study, finely dispersed cobalt particles supported on graphene are prepared as an anodic catalyst and coupled with phosphate activation to enhance and stabilize OER activity. The small particles enable a high exposure of the surface active sites. Also, the highly conductive graphene backbone accelerates electron transport. Activation by phosphate in the electrolyte leads to the formation of the active Co(iii) species with enriched oxygen vacancies meanwhile facilitating the kinetics. The finely dispersed cobalt particles supported on graphene together with phosphate activation lead to high electrochemical surface area and intrinsic activity, achieving a current density of 10 mA cm(-2) at an overpotential of 0.35 V and a low Tafel slope of 45 mV per decade, together with good stability. The cobalt mass based current density is 19-8000 times higher than current benchmarking catalysts.
机译：电化学水分裂是一个过程可再生能源储存在氢,这是一个绿色能源载体生产时只有水陷入了困境。水分离效率低是有限的阳极氧进化的反应(OER)导致高的过电压。细分散的钴颗粒支持石墨烯作为阳极催化剂和准备再加上磷酸活化增强,稳定在活动。使暴露的表面活性很高网站。骨干加速电子传递。磷酸活化的电解质线索形成积极的公司(iii)的物种与丰富氧气同时空缺促进动力学。钴粒子一起支持石墨烯与磷酸活化导致高电化学表面积和内在10马的活动,实现电流密度厘米(2)0.35 V的过电压和低塔菲尔的斜率45每十年mV,一起稳定性好。电流密度是19 - 8000倍基准测试催化剂。

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