Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology , Dalian 116024, China.
ACS Appl Mater Interfaces. 2017 Aug 30;9(34):28685-28694. doi: 10.1021/acsami.7b10138. Epub 2017 Aug 18.
The synthesis of electrocatalysts consisting of selectively functionalized parts is an effective strategy to prepare nonprecious electrocatalysts with excellent performance for oxygen evolution reaction (OER). Herein, we synthesized core-shell structured ZIF67@ZIF8 and converted it into Co decorated porous carbons (CS-Co/Cs) consisting of the ZIF67 derived uniformly dispersed Co nanoparticles encapsulated in graphitic carbon as cores and the ZIF8 derived porous carbon as shells. Compared to individual ZIF67 derived samples (Co/Cs), the unique structure of CS-Co/Cs leads to the larger surface area and more hydrophilic surface, both of which facilitate the mass transfer, contributing to the enhanced OER performance. The optimized CS-Co/C sample presents the low overpotential of 290 mV to deliver 10 mA cm toward OER in 1 M KOH, which is among the best of the reported nonprecious OER electrocatalysts. The CS-Co/C exhibits no obvious current attenuation at 1.53 V for 30 000 s, demonstrating its robust stability.
合成由选择性功能化部分组成的电催化剂是制备用于氧气析出反应 (OER) 的具有优异性能的非贵金属电催化剂的有效策略。在此，我们合成了核壳结构的 ZIF67@ZIF8，并将其转化为 Co 修饰的多孔碳 (CS-Co/Cs)，由 ZIF67 衍生的均匀分散的 Co 纳米颗粒作为核，ZIF8 衍生的多孔碳作为壳封装而成。与单独的 ZIF67 衍生样品 (Co/Cs) 相比，CS-Co/Cs 的独特结构导致更大的表面积和更亲水的表面，这两者都有利于质量传递，有助于提高 OER 性能。优化后的 CS-Co/C 样品在 1 M KOH 中提供了低至 290 mV 的过电位，以实现 10 mA cm 对 OER 的输送，这是报道的非贵金属 OER 电催化剂中的最佳性能之一。CS-Co/C 在 1.53 V 下 30000 s 内没有明显的电流衰减，表现出其强大的稳定性。
