Liu Tianpeng, Zhang Yangping, Ye Changqing, Wang Dongqiong, Wang Caiqin, Du Yukou
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Industrial Park, Renai Road, Suzhou 215123, China.
Jiangsu Key Laboratory for Environment Functional Materials, School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
J Colloid Interface Sci. 2024 Feb;655:466-473. doi: 10.1016/j.jcis.2023.11.029. Epub 2023 Nov 7.
Metal organic frameworks (MOFs) are considered as promising electrocatalytic materials due to their tunable porosity, functional organic ligands, and large specific surface area for oxygen evolution reaction (OER). Recently, most reported electrocatalysts focus on the establishing heterogeneous structures by thermal treatments to improve OER performance. However, the thermal treatments are accompanied by the complex synthetic process and destruction of the MOFs structure. Therefore, improving the catalytic performance of pristine MOFs remains a challenge. Here, a series of trimetallic MMM-MOFs (M represents metal element) were synthesized by one-pot method. Modulating the Co/Ni ratio not only adjusts the morphology of FeCoNi-MOFs, but also effectively optimizes the electronic structure. The composition-optimized FeCoNi-MOF nano-bundles (FeCoNi-NBs) only required a low overpotential of 273 mV to achieve the current density of 10 mA cm in alkaline solution, with a Tafel slope of 51.1 mV dec, lower than other FeCoNi-MOFs and commercial RuO catalyst. The two-electrode couple FeCoNi-NBs || Pt/C achieved the cell voltage of 1.55 V, delivering current density of 10 mA cm for overall water splitting.
金属有机框架材料（MOFs）因其可调节的孔隙率、功能性有机配体以及用于析氧反应（OER）的大比表面积而被认为是有前景的电催化材料。最近，大多数报道的电催化剂专注于通过热处理建立异质结构以提高OER性能。然而，热处理伴随着复杂的合成过程以及MOFs结构的破坏。因此，提高原始MOFs的催化性能仍然是一个挑战。在此，通过一锅法合成了一系列三金属MMM-MOFs（M代表金属元素）。调节Co/Ni比例不仅可以调整FeCoNi-MOFs的形态，还能有效优化电子结构。组成优化的FeCoNi-MOF纳米束（FeCoNi-NBs）在碱性溶液中仅需273 mV的低过电位即可实现10 mA cm的电流密度，塔菲尔斜率为51.1 mV dec，低于其他FeCoNi-MOFs和商业RuO催化剂。两电极对FeCoNi-NBs || Pt/C实现了1.55 V的电池电压，为全水解提供了10 mA cm的电流密度。
