Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences , Yang Qiao West Road 155#, Fuzhou, Fujian 350002, P. R. China.
ACS Appl Mater Interfaces. 2017 Nov 8;9(44):38621-38628. doi: 10.1021/acsami.7b13359. Epub 2017 Oct 24.
Developing an efficient, stable yet cost-effective electrocatalyst is the key link along the path to hydrogen fuels produced by water splitting. The current bottleneck in the water electrolysis technology is the sluggish oxygen-evolving reaction (OER) which is also central to the rechargeable metal-air batteries. Herein, we report a promising mixed-metal-organic framework (MMOF) self-template strategy to synthesize CoFe hybrid oxyphosphides with highly porous morphology. Aided by the porous hybrid bulk structure beneficial to fast-ion diffusion to abundant highly active sites, the as-synthesized CoFePO exhibited excellent electrocatalytic activity toward OER, with an overpotential of 291 mV at 10 mA cm and a low Tafel slope of 85 mV dec. With the underpinnings of MMOF maintaining the structural rigidity and stability, the material also showed long life for OER without discernible activity decay.
开发高效、稳定且经济实惠的电催化剂是通过水分解生产氢气的关键环节。当前水分解技术的瓶颈是氧气析出反应（OER）缓慢，这也是可充电金属-空气电池的核心。在此，我们报告了一种有前途的混合金属-有机骨架（MMOF）自模板策略，用于合成具有高多孔形态的 CoFe 混合氧磷化物。得益于有利于快速离子扩散到丰富的高活性位点的多孔混合体结构，所合成的 CoFePO 对 OER 表现出优异的电催化活性，在 10 mA cm 时的过电势为 291 mV，塔菲尔斜率低至 85 mV dec。在 MMOF 的基础上保持结构的刚性和稳定性，该材料在 OER 中也表现出长寿命，没有可察觉的活性衰减。
