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首页> 外文期刊>Catalysis science & technology >Valence-variable thiospinels for ampere-scale water electrolysis
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Valence-variable thiospinels for ampere-scale water electrolysis

机译：用于安培级水电解的价可变硫刺石

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摘要

Oxygen electrochemistry plays a key role in industrial hydrogen fuel production from water electrolysis, but the slow kinetics of the anodic oxygen evolution reaction (OER) at large current density restricts the commercialization of such energy devices. Here, we design a new class of valence-variable metal-modified CuCo2S4 thiospinels, termed as v-M–CuCo2S4/NF (v-M = Mn, V, Cr), to achieve large-current-density OER performance. The introduction of valence-variable metals (v-M) can promote the generation of a special oxyhydroxide-like active phase with a contractive interatomic Co–Co distance, which breaks the limit of the inherent linear scaling relationship and causes the OER on v-M–CuCo2S4/NF to follow a more efficient oxide path mechanism. Therefore, v-M–CuCo2S4/NF, taking Mn–CuCo2S4/NF as a representative, delivers low overpotentials of 255 and 378 mV to achieve large current densities of 500 and 1500 mA cm−2 in alkaline electrolytes. The optimal catalyst shows a large mass activity of 3000 A gmetal−1 and a high turnover frequency of 16 500 h−1 at a low overpotential of 378 mV (1500 mA cm−2), tens of times larger than commercial RuO2/NF. The design principle provides some hints for optimizing abundant spinel materials as large current density OER catalysts.
机译：电化学氧起着关键作用工业从水中氢燃料生产电解,但是阳极的慢动力学氧进化反应(OER)大电流密度制约的商业化能源设备。valence-variable metal-modified CuCo2S4thiospinels,称为v-M-CuCo2S4 / NF(伏特计=锰、V, Cr),实现large-current-density OER表演金属(伏特计)可以促进的一代与特殊oxyhydroxide-like活跃阶段收缩原子间距离可可脂,打破固有的线性扩展的极限OER v-M-CuCo2S4 / NF关系和原因遵循一个更有效的氧化路径机制。因此,v-M-CuCo2S4 / NF, Mn-CuCo2S4 / NF作为一个代表,提供较低的过电压255年和378年的mV,实现大电流密度500年和1500年的马厘米−2在碱性电解质。质量活动的3000 gmetal−1和高营业额16 500 h−1的频率低过电压378 mV的马(1500厘米−2),数万倍商业RuO2 / NF。优化的原则提供了一些提示丰富的尖晶石材料大电流密度在催化剂。

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