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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Spin state engineered ZnxCo3-xO4 as an efficient oxygen evolution electrocatalyst
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Spin state engineered ZnxCo3-xO4 as an efficient oxygen evolution electrocatalyst

机译：旋转状态工程ZnxCo3-XO4作为高效的氧气进化电催化剂

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摘要

Oxygen evolution is the key step in the oxidation of water in electrolyzers and photoelectrochemical cells for the production of hydrogen. Developing a non-precious metal oxide catalyst with good electrocatalytic activity for the oxygen evolution reaction (OER) is very challenging. In this work, nanostructured ZnxCo3-xO4 has been shown as an efficient catalyst with a low overpotential for the OER in 0.1 M KOH solution. Substitution of Co2+ in the spinel oxide Co3O4 with Zn2+ creates a higher number of high-spin Co3+, which is found to be directly correlated with the OER activity of ZnxCo3-xO4. Zn0.8Co2.2O4 (x = 0.8) with the optimum amount of Co2+/Co3+ and high-spin Co3+ content showed a very low overpotential of approximate to 250 mV, at 10 mA cm(-2), with a turnover frequency of approximate to 3 x 10(-3) s(-1) for the OER. The high Faradaic efficiency along with the stability of Zn0.8Co2.2O4 and electrocatalytic activity comparable with that of precious metal oxides indicate that this composition is a promising catalyst for water oxidation.
机译：氧气进化是用于生产氢气的电解器和光电化学电池中的水氧化的关键步骤。开发具有良好电催化活性的非贵金属氧化物催化剂，用于氧气进化反应（oer）是非常具有挑战性的。在这项工作中，纳米结构ZnXCO 3-XO4已被示为0.1M KOH溶液中具有低过电位的有效催化剂。用Zn2 +取代尖晶石氧化物CO3O4中的CO2 +产生较高数量的高旋转CO3 +，其发现与ZnXCO3-XO4的oer活性直接相关。 Zn0.8Co2.2O4（x = 0.8）具有最佳量的CO 2 + / CO3 +和高旋转CO3 +含量显示出大约250mV的非常低的过电位，10 mA cm（-2），周转频率近似为oer为3 x 10（-3）s（-1）。高法达效率以及Zn0.8Co2.2O4的稳定性和与贵金属氧化物的电催化活性相当，表明该组合物是用于水氧化的有希望的催化剂。

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