Bimetallic organic framework derived Co-MoxN/Mo2C catalyst for HER/OER bifunctional electrocatalytic reaction
Ping Hu, Fairy Fan Yang, Fairy Fan Yang, Fan Yang, Fan Yang, Fei Zhu, Jiao Luo, Xiaolong Chen, Wenqi Li, Jiaming Bian, Lili Gao, Kuaishe Wang, Zongyou Yin
Abstract
• A novel bimetallic MOFs with a stable and special framework structure was developed. • Framework structure solved problem of easy aggregation and collapse of Mo 2 C material. • High specific surface area 3D Co-Mo x N/Mo 2 C provide more HER/OER catalytic active sites. Metal organic frameworks (MOFs) are widely used as precursors due to their tunable morphology and high specific surface area. Molybdenum nitride (MoN) and molybdenum carbide (Mo 2 C) are promising catalyst materials with electronic structures similar to the noble metal platinum. However, the preparation and modification of the composite systems comprising MoN and Mo 2 C are complex, often leading to significant agglomeration and limiting their application in various catalytic fields. In this work, we designed and developed a novel bimetallic Co-MOFs-Mo with a stable and unique framework morphology. By varying the organic ligand content, we controlled the morphology and enhanced the intrinsic electrocatalytic activity through Mo doping. Using the Co-MOFs-Mo sample as the Co source, we fabricated a Co-Mo x N/Mo 2 C catalytic material with a special framework structure. Compared to Mo 2 N and Mo 2 N/Mo 2 C, this catalyst exhibits a larger specific surface area and superior performance in both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The Co-Mo x N/Mo 2 C catalyst achieves an HER overpotential of 297 mV at a current density of 10 mA·cm −2 and an OER overpotential of 480 mV at 20 mA·cm −2 . This research provides valuable insights into the rational design of molybdenum-based noble-metal-free catalyst materials.