Impact of Highly Concentrated Alkaline Treatment on Mesostructured Cobalt Oxide for the Oxygen Evolution Reaction,Advanced Sustainable Systems

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Impact of Highly Concentrated Alkaline Treatment on Mesostructured Cobalt Oxide for the Oxygen Evolution Reaction
Advanced Sustainable Systems ( IF 6.5 ) Pub Date : 2023-03-16 , DOI: 10.1002/adsu.202200499
Eko Budiyanto ₁ , Cristina Ochoa‐Hernández ₁ , Harun Tüysüz ₁

Affiliation

Commercial alkaline water electrolysis cells typically use highly concentrate KOH as electrolyte, which strongly influences alteration of catalyst and its performance. Herein, the impact of alkaline treatment toward the structural alteration and electrochemical oxygen evolution reaction (OER) activity of well-defined ordered mesoporous Co₃O₄ is systematically studied. The overall morphology of mesostructured Co₃O₄ is relatively resilient to the exposure of highly concentrated alkaline solution up to 13 m KOH. The spectroscopic analyses, including in situ diffuse reflectance infrared spectroscopy, reveal the presence of carbonate-based species after the alkaline treatment due to impurities of the commercial KOH. The pre-treated samples exhibit a higher electrochemically active surface area, decreased charge transfer resistance, and increased current density from 103 to 155 mA cm⁻² at 1.7 V versus RHE. The in situ electrochemical Raman spectroscopy investigation supports formation of active CoOOH phase on KOH pre-treated Co₃O₄, which might play a key role toward enhanced OER activity.

中文翻译：

高浓度碱处理对用于析氧反应的介观结构氧化钴的影响

商业碱性水电解槽通常使用高浓度 KOH 作为电解质，这强烈影响催化剂的变化及其性能。在此，系统地研究了碱处理对明确有序的介孔 Co ₃ O _{4的结构改变和电化学析氧反应 (OER) 活性的影响。}_{介观结构 Co 3} O ₄的整体形态对暴露于高达 13 m的高浓度碱性溶液具有相对弹性氢氧化钾。包括原位漫反射红外光谱在内的光谱分析表明，由于商业 KOH 的杂质，碱处理后存在碳酸盐基物质。与 RHE 相比，经过预处理的样品在 1.7 V 下表现出更高的电化学活性表面积、更低的电荷转移电阻和更高的电流密度，从 103 增加到 155 mA cm ^{-2 。}原位电化学拉曼光谱研究支持在 KOH 预处理的 Co ₃ O ₄上形成活性 CoOOH 相，这可能对提高 OER 活性起关键作用。

更新日期：2023-03-16

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