Beijing Key Laboratory for Green Catalysis and Separation and Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering , Beijing University of Technology , Beijing 100124 , P. R. China.
ACS Appl Mater Interfaces. 2019 Nov 6;11(44):41595-41601. doi: 10.1021/acsami.9b16224. Epub 2019 Oct 23.
A feasible strategy for the growth of two-dimensional (2D) [Ni(OH)(1,4-BDC)-(HO)]·2HO (Ni-BDC; 1,4-BDC = 1,4-benzenedicarboxylate) and the subsequent partial sulfurization treatment for the decoration of nickle sulfide (NiS) is developed. The fabricated hierarchically structured Ni-BDC@NiS as a synergistic electrocatalyst shows extremely high activity toward the oxygen evolution reaction (OER). The optimal Ni-BDC@NiS catalyst acquires a current density of 20 mA cm at a lower overpotential of 330 mV and low Tafel slope of 62 mV dec, outperforming most previously reported Ni-based sulfide catalysts. Clearly, the combination of the NiS and Ni-BDC array contributed to the improvement of electron transfer, promotion of water adsorption, and increase of rich active species. In addition, the created hierarchical structure not only affords feasible access for mass transport but also strengthens structural integrity, contributing to efficient and stable OER performance. This general and effective strategy anchoring conductive active species on a porous metal-organic framework (MOF) thus provides an efficient way to fabricate synergistic electrocatalysts for the OER.
发展了一种可行的策略，用于二维（2D）[Ni(OH)(1,4-BDC)-(HO)]·2HO（Ni-BDC；1,4-BDC = 1,4-苯二甲酸）的生长，以及随后的部分硫化处理，以修饰镍硫化物（NiS）。所制备的具有分级结构的 Ni-BDC@NiS 作为协同电催化剂，对析氧反应（OER）表现出极高的活性。最佳的 Ni-BDC@NiS 催化剂在更低的过电势 330 mV 下获得 20 mA cm 的电流密度，并且 Tafel 斜率较低，为 62 mV dec，优于大多数先前报道的 Ni 基硫化物催化剂。显然，NiS 和 Ni-BDC 阵列的组合有助于提高电子转移、促进水吸附和增加丰富的活性物质。此外，所创建的分级结构不仅为质量传输提供了可行的途径，而且还增强了结构的完整性，有助于高效和稳定的 OER 性能。这种将导电活性物质锚定在多孔金属有机骨架（MOF）上的通用有效策略为制备协同电催化剂提供了一种有效的方法，用于 OER。
