Highly Active Cobalt-Based Electrocatalysts with Facile Incorporation of Dopants for the Oxygen Evolution Reaction
Highly Active Cobalt-Based Electrocatalysts with Facile Incorporation of Dopants for the Oxygen Evolution Reaction
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DOI：
10.1002/anie.201813052
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发表时间：
2019-03-11
影响因子：
16.6
通讯作者：
Tueysuez, Harun
中科院分区：
文献类型：
--
作者：
Moon, Gun-hee;Yu, Mingquan;Tueysuez, Harun
用于析氧反应的电活性钴物质的原位形成简单地通过向涂覆在玻璃碳电极上的市售钴前体和Nafion粘合剂混合物施加阳极偏压来实现。该制备不需要能量密集型材料制备步骤或贵金属，但在1 M KOH中获得了在10.2 mA cm（-2）下322 mV的低过电位和在1.7 V-NHE下超过300 mA cm（-2）的高电流密度。的操作电化学拉曼光谱研究证实了钴羟基氧化物物种的形成和铁刺激的Co 3+和Co 4+之间的平衡状态。碱性电解质或油墨溶液中的铁有效地活化了钴物种，并且大多数第一行过渡金属也可以增强催化性能。这里提出的概念是制备高活性电催化剂的最简单的策略之一，并且对于用其他过渡金属替代钴非常灵活。
In situ formation of electroactive cobalt species for the oxygen evolution reaction is simply achieved by applying an anodic bias to a commercially available cobalt precursor and Nafion binder mixture coated on a glassy carbon electrode. This preparation does not require energy-intensive materials preparation steps or noble metals, yet a low overpotential of 322 mV at 10.2 mA cm(-2) and a high current density of more than 300 mA cm(-2) at 1.7 V-NHE were obtained in 1 m KOH. An operando electrochemical Raman spectroscopy study confirmed the formation of cobalt oxyhydroxide species and the iron stimulated the equilibrium state between Co3+ and Co4+. The iron present in the alkali electrolyte or ink solution effectively activated the cobalt species, and most of the first row transition metals could also enhance the catalytic performance. The concept presented here is one of the simplest strategies for preparing highly active electrocatalysts and is very flexible for the replacement of cobalt by other transition metals.