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One-step fabrication of a self-supported Co@CoTe2 electrocatalyst for efficient and durable oxygen evolution reactions
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020-05-25 , DOI: 10.1039/d0qi00372g Yu Qi 1, 2, 3, 4 , Jie Wu 1, 2, 3, 4 , Junyuan Xu 5, 6, 7 , Han Gao 1, 2, 3, 4 , Zijuan Du 1, 2, 3, 4 , Baoshun Liu 1, 2, 3, 4 , Lifeng Liu 5, 6, 7 , Dehua Xiong 1, 2, 3, 4, 8
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020-05-25 , DOI: 10.1039/d0qi00372g Yu Qi 1, 2, 3, 4 , Jie Wu 1, 2, 3, 4 , Junyuan Xu 5, 6, 7 , Han Gao 1, 2, 3, 4 , Zijuan Du 1, 2, 3, 4 , Baoshun Liu 1, 2, 3, 4 , Lifeng Liu 5, 6, 7 , Dehua Xiong 1, 2, 3, 4, 8
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We report a very convenient and cost-effective approach for the fabrication of a self-supported Co@CoTe2 electrode comprising CoTe2 nanoparticles used for water oxidation catalysis, which is achieved by one-step hydrothermal treatment of commercially available cobalt foam. The characteristics of the as-fabricated Co@CoTe2 electrode in terms of the crystal structure, surface morphology and chemical components were analyzed. Moreover, the electrochemical properties of the Co@CoTe2 electrocatalyst used for water electrolysis were comprehensively investigated. When used to catalyze the oxygen evolution reaction (OER) in 1.0 M KOH, Co@CoTe2 electrodes exhibit outstanding catalytic activity and long-term durability, thus outperforming many well-studied cobalt based dichalcogenides (including tellurides, selenides and sulfides) that have been recently reported in the literature. Particularly, Co@CoTe2 prepared at 240 °C (Co@CoTe2-240) requires a low overpotential of only 286 mV to attain an anodic current density of 10 mA cm−2 and shows fast kinetics for the OER with a small Tafel slope of 42 mV dec−1. Moreover, the overpotential needed to maintain 10 mA cm−2 is merely increased by 20 mV after continuous OER electrolysis for 16 hours, exhibiting excellent long-term stability. Given the commercial availability of porous Co foam, the convenient and scalable approach of hydrothermal synthesis and the outstanding catalytic performance, the self-supported Co@CoTe2 electrode reported here holds great promise as an important OER electrocatalyst in water splitting devices and metal–air batteries.
中文翻译：
一步制备自支撑Co @ CoTe2电催化剂以实现高效持久的氧释放反应
我们报告了一种非常方便且具有成本效益的方法，用于制造自支撑的Co @ CoTe 2电极，该电极包含用于水氧化催化的CoTe 2纳米粒子，这是通过对商用泡沫钴进行一步水热处理而实现的。分析了所制备的Co @ CoTe 2电极在晶体结构，表面形态和化学成分方面的特性。此外，对用于水电解的Co @ CoTe 2电催化剂的电化学性能进行了全面研究。当用于在1.0 M KOH中催化氧释放反应（OER）时，Co @ CoTe 2电极表现出出色的催化活性和长期耐久性，因此胜过了许多文献中最近报道的许多研究充分的钴基二卤化物（包括碲化物，硒化物和硫化物）。特别地，钴@的CoTe 2在240℃下制备的（共@的CoTe 2 -240）需要一个低的超电压只有286毫伏达到的10毫安cm的阳极电流密度-2，并显示快速动力学的OER用小塔菲尔42 mV dec -1的斜率。此外，维持10 mA cm -2所需的过电势连续OER电解16小时后，仅增加20 mV，表现出出色的长期稳定性。鉴于多孔Co泡沫的商业可得性，便捷且可扩展的水热合成方法以及出色的催化性能，此处报道的自支撑Co @ CoTe 2电极在分水装置和金属-空气中作为重要的OER电催化剂具有广阔的前景电池。
更新日期：2020-06-30
中文翻译：
一步制备自支撑Co @ CoTe2电催化剂以实现高效持久的氧释放反应
我们报告了一种非常方便且具有成本效益的方法，用于制造自支撑的Co @ CoTe 2电极，该电极包含用于水氧化催化的CoTe 2纳米粒子，这是通过对商用泡沫钴进行一步水热处理而实现的。分析了所制备的Co @ CoTe 2电极在晶体结构，表面形态和化学成分方面的特性。此外，对用于水电解的Co @ CoTe 2电催化剂的电化学性能进行了全面研究。当用于在1.0 M KOH中催化氧释放反应（OER）时，Co @ CoTe 2电极表现出出色的催化活性和长期耐久性，因此胜过了许多文献中最近报道的许多研究充分的钴基二卤化物（包括碲化物，硒化物和硫化物）。特别地，钴@的CoTe 2在240℃下制备的（共@的CoTe 2 -240）需要一个低的超电压只有286毫伏达到的10毫安cm的阳极电流密度-2，并显示快速动力学的OER用小塔菲尔42 mV dec -1的斜率。此外，维持10 mA cm -2所需的过电势连续OER电解16小时后，仅增加20 mV，表现出出色的长期稳定性。鉴于多孔Co泡沫的商业可得性，便捷且可扩展的水热合成方法以及出色的催化性能，此处报道的自支撑Co @ CoTe 2电极在分水装置和金属-空气中作为重要的OER电催化剂具有广阔的前景电池。
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