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Understanding the Enhancement of Electrocatalytic Activity toward Hydrogen Evolution in Alkaline Water Splitting by Anodically Formed Oxides on Ni and C-containing Ni
ChemElectroChem ( IF 3.5 ) Pub Date : 2021-08-16 , DOI: 10.1002/celc.202100723
Iwona Flis-Kabulska 1 , Arkadiusz Gajek 2 , Janusz Flis 3
ChemElectroChem ( IF 3.5 ) Pub Date : 2021-08-16 , DOI: 10.1002/celc.202100723
Iwona Flis-Kabulska 1 , Arkadiusz Gajek 2 , Janusz Flis 3
Affiliation
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Nickel oxides/hydroxides are active electrocatalysts for the hydrogen evolution reaction (HER) in alkaline water electrolysis. A durable activity of Ni with Ni(OH)2 was observed mainly on porous substrates, such as nickel foam or carbon cloth. Herein, we examined the effect of anodic oxidation on the HER using smooth samples of Ni, Ni with graphene, and Ni with C introduced by a low-temperature plasma treatment. Electrochemical measurements in 1.0 M KOH showed that a strong activation toward HER was achieved by voltammetric cycling to potentials of the formation of Ni3O4, Ni2O3, and/or NiO2. The presence of C enhanced this activation. The effect of C was explained by the accumulation of larger amounts of these products as a result of a deteriorated passivity, their higher compactness (demonstrated by higher impedance), and the longer durability under conditions of HER (revealed by a slower cathodic reduction). The durability of oxides in porous C structures can be explained by anodic potentials in pores owing to the ohmic potential drop. It is proposed that anodic oxidation might be used for the reactivation of Ni cathodes for water electrolysis.
中文翻译：
了解在镍和含碳镍上阳极形成的氧化物对碱性水分解中析氢电催化活性的增强
镍氧化物/氢氧化物是碱性水电解中析氢反应 (HER) 的活性电催化剂。Ni 与 Ni(OH) 2的持久活性主要在多孔基材上观察到，例如镍泡沫或碳布。在此，我们使用通过低温等离子体处理引入的 Ni、Ni 与石墨烯和 Ni 与 C 的光滑样品检查了阳极氧化对 HER 的影响。在 1.0 M KOH 中的电化学测量表明，通过伏安循环到形成 Ni 3 O 4、Ni 2 O 3和/或 NiO 2 的电位实现了对 HER 的强烈激活. C 的存在增强了这种激活。C 的影响可以解释为，由于钝化性恶化，它们的更高的致密性（由更高的阻抗证明）以及在 HER 条件下更长的耐用性（由较慢的阴极还原显示）而导致大量这些产物的积累。多孔 C 结构中氧化物的耐久性可以通过由于欧姆电位下降而导致的孔中的阳极电位来解释。提出阳极氧化可用于水电解的镍阴极的再活化。
更新日期：2021-09-02
中文翻译：
了解在镍和含碳镍上阳极形成的氧化物对碱性水分解中析氢电催化活性的增强
镍氧化物/氢氧化物是碱性水电解中析氢反应 (HER) 的活性电催化剂。Ni 与 Ni(OH) 2的持久活性主要在多孔基材上观察到，例如镍泡沫或碳布。在此，我们使用通过低温等离子体处理引入的 Ni、Ni 与石墨烯和 Ni 与 C 的光滑样品检查了阳极氧化对 HER 的影响。在 1.0 M KOH 中的电化学测量表明，通过伏安循环到形成 Ni 3 O 4、Ni 2 O 3和/或 NiO 2 的电位实现了对 HER 的强烈激活. C 的存在增强了这种激活。C 的影响可以解释为，由于钝化性恶化，它们的更高的致密性（由更高的阻抗证明）以及在 HER 条件下更长的耐用性（由较慢的阴极还原显示）而导致大量这些产物的积累。多孔 C 结构中氧化物的耐久性可以通过由于欧姆电位下降而导致的孔中的阳极电位来解释。提出阳极氧化可用于水电解的镍阴极的再活化。
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