Wu Yuanyuan, Gu Xuejiao, Jiang Wei, Lang Jihui, Ma Yunchao, Lu Yang, Yang Xiaotian, Liu Chunbo, Che Guangbo
Key Laboratory of Preparation Application of Environmental Friendly Materials, Ministry of Education, College of Chemistry, Jilin Normal University, Siping 136000, P. R. China.
Jilin Joint Technology Innovation Laboratory of Developing and Utilizing Materials of Reducing Pollution and Carbon Emissions, College of Engineering, Jilin Normal University, Siping, 136000, P. R. China.
Dalton Trans. 2023 Nov 7;52(43):15767-15774. doi: 10.1039/d3dt02712k.
Hydrogen economy has emerged as a promising alternative to the current hydrocarbon economy. It involves harvesting renewable energy to split water into hydrogen and oxygen and then further utilising clean hydrogen fuel for various applications. The rational exploration of advanced non-precious metal bifunctional electrocatalysts for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is critical for efficient water splitting. Herein, an ultralow Ru-modified cobalt metal-organic framework (CoRu-MOF/NF) two-dimensional nanosheet array bifunctional catalyst was fabricated through a strategy under mild experimental conditions. The obtained CoRu-MOF/NF exhibited excellent bifunctional electrocatalytic activity and stability in alkaline media, with low overpotentials of 37 and 181 mV and significant durability for more than 95 and 110 h toward the HER and OER at 10 mA cm, respectively. The experimental results showed that the two-dimensional nanoarray structure had a large specific surface area and abundant exposed active sites. Additionally, ultralow Ru modification optimized the electronic structure and improved the conductivity of the cobalt metal-organic frameworks, thereby reducing the energy barrier of the rate-limiting step and accelerating the water splitting reaction.
氢经济已成为当前碳氢化合物经济的一种有前景的替代方案。它涉及获取可再生能源以将水分解为氢气和氧气，然后进一步将清洁的氢燃料用于各种应用。合理探索用于析氧反应（OER）和析氢反应（HER）的先进非贵金属双功能电催化剂对于高效水分解至关重要。在此，通过一种在温和实验条件下的策略制备了一种超低Ru修饰的钴金属有机框架（CoRu-MOF/NF）二维纳米片阵列双功能催化剂。所获得的CoRu-MOF/NF在碱性介质中表现出优异的双功能电催化活性和稳定性，在10 mA cm下，HER和OER的过电位分别低至37和181 mV，并且具有超过95和110 h的显著耐久性。实验结果表明，二维纳米阵列结构具有大的比表面积和丰富的暴露活性位点。此外，超低Ru修饰优化了电子结构并提高了钴金属有机框架的导电性，从而降低了限速步骤的能垒并加速了水分解反应。
