Herein, we report the microwave hydrothermal synthesis of highly porous and conductive 2D Co-catecholate MOFs (Co-CATs) in the absence (Co-CAT-WO) and presence (Co-CAT-W) of N-methyl-2-pyrrolidone (NMP) polar solvent, and the study of these Co-CATs as electrocatalysts for oxygen evolution reaction (OER). The OER performance of Co-CAT-WO and Co-CAT-W is compared. The as-synthesized Co-CATs exhibit a 2D layered hexagonal structure. The electrical conductivity of Co-CAT-WO and Co-CAT-W is 6.9 and 5.8 S/m, respectively. The good conductivity and porous structure can initiate charge transport to achieve better OER performance under the 4e--transfer process. The as-prepared Co-CAT-WO and Co-CAT-W, respectively, show an overpotential of 455 and 424 mV at 10 mA/cm2 after performing the durability and chronoamperometry experiments for 13 h in 1 M KOH. From the electrochemical studies, it is apparent that the Co-CAT-W exhibits better OER performance with low overpotential, high current density, and excellent stability over extended cycling. Moreover, the lower HOMO-LUMO gap for Co-CAT-W than that of the Co-CAT-WO endorses its better electrocatalytic activity. The post-OER results show that the Co-CAT-W electrocatalyst acts as a "precatalyst" rather than the original catalyst, and it undergoes electrochemical transformation to metal hydroxide and metal oxyhydroxide after the OER studies, promoting the OER kinetics. The findings of this work offer valuable insights into the synthetic strategies for developing 2D conducting metal-catecholate MOF catalysts for efficient and sustainable OER processes, which is crucial in water splitting for sustainable energy production.

中文翻译：

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二维导电共儿茶酚酸盐金属有机框架电催化析氧反应性能的定制


在此，我们报道了在不存在 （Co-CAT-WO） 和存在 （Co-CAT-W） N-甲基-2-吡咯烷酮 （NMP） 极性溶剂的情况下微波水热合成高度多孔和导电的 2D 共儿茶酸盐 MOF （Co-CATs），以及这些 Co-CATs 作为析氧反应 （OER） 电催化剂的研究。比较了 Co-CAT-WO 和 Co-CAT-W 的 OER 性能。合成的 Co-CAT 表现出 2D 分层六边形结构。Co-CAT-WO 和 Co-CAT-W 的电导率分别为 6.9 和 5.8 S/m。良好的导电性和多孔结构可以启动电荷传输，从而在 4e 转移工艺下实现更好的 OER 性能。制备的 Co-CAT-WO 和 Co-CAT-W 在 1 M KOH 中进行耐久性和计时安培实验 13 小时后，在 10 mA/cm2 时分别显示 455 和 424 mV 的过电位。从电化学研究中可以明显看出，Co-CAT-W 表现出更好的 OER 性能，具有低过电位、高电流密度和在延长循环中出色的稳定性。此外，Co-CAT-W 的 HOMO-LUMO 间隙低于 Co-CAT-WO，这证明了其更好的电催化活性。OER 后结果表明，Co-CAT-W 电催化剂充当“预催化剂”而不是原始催化剂，并且在 OER 研究后发生电化学转变为金属氢氧化物和金属羟基氧化物，促进了 OER 动力学。这项工作的结果为开发用于高效和可持续 OER 工艺的 2D 导电金属儿茶酸盐 MOF 催化剂的合成策略提供了有价值的见解，这对于可持续能源生产的分解水至关重要。