Shen Wei, Cui Jian, Chen Chuntao, Zhang Lei, Sun Dongping
Institute of Chemicobiology and Functional Materials, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, 200 Xiao Ling Wei, Nanjing 210094, China.
Institute of Chemicobiology and Functional Materials, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, 200 Xiao Ling Wei, Nanjing 210094, China.
J Colloid Interface Sci. 2024 Apr;659:364-373. doi: 10.1016/j.jcis.2023.12.171. Epub 2023 Dec 30.
Metal-organic framework (MOF) derived transition metal-based electrocatalysts have received great attention as substitutes for noble metal-based hydrogen evolution catalysts. However, the low conductivity and easy detachments from electrodes of raw MOF have seriously hindered their applications in hydrogen evolution reaction. Herein, we report the facile preparation of Co-NSC@CBC84, a porous carbon-based and self-supported catalyst containing CoS active species, by pyrolysis and sulfidation of in-situ grown ZIF-67 on polydopamine-modified biomass bacterial cellulose (PDA/BC). As a binder-free and self-supported electrocatalyst, Co-NSC@CBC84 exhibits superior electrocatalytic properties to other reported cobalt-based sulfide catalytic materials and has good stability in 0.5 M HSO electrolyte. At the current density of 10 mA cm, only an overpotential of 138 mV was required, corresponding to a Tafel slope of 123 mV dec, owing to the strong synergy effect between Co-NSC nanoparticles and CBC substrate. This work therefore provides a feasible approach to prepare self-supported transition metal sulfides as HER catalysts, which is helpful for the development of noble metal-free catalysts and biomass carbon materials.
金属有机框架（MOF）衍生的过渡金属基电催化剂作为贵金属基析氢催化剂的替代品受到了广泛关注。然而，原始MOF的低导电性以及易从电极上脱落的问题严重阻碍了它们在析氢反应中的应用。在此，我们报道了通过在聚多巴胺修饰的生物质细菌纤维素（PDA/BC）上原位生长ZIF-67，然后进行热解和硫化，简便地制备了Co-NSC@CBC84，这是一种含有CoS活性物种的多孔碳基自支撑催化剂。作为一种无粘结剂的自支撑电催化剂，Co-NSC@CBC84表现出优于其他已报道的钴基硫化物催化材料的电催化性能，并且在0.5 M HSO电解质中具有良好的稳定性。在10 mA cm的电流密度下，仅需138 mV的过电位，对应于123 mV dec的塔菲尔斜率，这归因于Co-NSC纳米颗粒与CBC基底之间的强协同效应。因此，这项工作提供了一种制备自支撑过渡金属硫化物作为析氢催化剂的可行方法，这有助于无贵金属催化剂和生物质碳材料的开发。
