Regulation the electrocatalytic performance of Ni-MOF derived material by extending the organic ligand

作者：Yang, Xu-Dong; Huang, Jing-Yu; Zhou, Hai-Bin; Ni, Ya-Lu; Duan, Chun-Pu; Qin, Ling^*; Wang, Yan-Qing^*

来源：Journal of Solid State Chemistry, 2023, 323: 124004.

DOI：10.1016/j.jssc.2023.124004

• Ni-MOF
• Ligand extention
• Derived material
• Hydrogen evolution reaction
• Urea oxidation reaction

The overuse of fossil fuels has accelerated the desire for clean energy. Hydrogen energy has become an important energy on the world energy stage in the 21st century. Hydrogen production technology has also become the focus of attention. Based on the previous reported Ni-bib (bib = 1,4-bis(1H-imidazole-1-yl) benzene), Ni-bibp (bibp = 4,4'-bi(1H-imidazole-1-yl)-1,1'-biphenyl) with longer ligand was designed and synthesized by solvothermal method. Its molecular formula is {[Ni-4(bibp)(4)(SO42-)(4)(H2O)(8)]}(n). Ni-bibp-900 derived from high temperature pyrolysis can be used as bi-functional electrode material for HER (hydrogen evolution reaction) and UOR (urea oxidation reaction). For HER, the overpotential is -297mV at a current density of 10 mA cm(-2). The Tafel slope of the Ni-bibp-900 is 153.3 mV center dot dec(-1). For UOR, the overpotential is 1.4 V when the current density is 10 mA cm(-2). The Tafel slope of the Ni-bibp-900 is 97.53 mV center dot dec(-1). The performance of UOR and HER is better than that of Ni-bib-T. In addition, we also studied the effect of different doping amounts of zinc ions on HER. The results show that the HER performance is improved after doping zinc ion, which may be attributed to the sublimation of zinc ions during the pyrolysis process.