Hefei National Laboratory for Physical Science at Microscale, Department of Materials Science & Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, University of Science and Technology of China , Hefei 230026, China.
School of Chemistry and Materials Engineering, Fuyang Normal University , Fuyang 236041, China.
ACS Appl Mater Interfaces. 2017 Feb 1;9(4):3596-3601. doi: 10.1021/acsami.6b12065. Epub 2017 Jan 20.
The hydrogen evolution reaction highly relied on Pt electrocatalysts, with high activity and stability. In the past few years, a host of efforts have been made in the development of novel platinum nanostructures with a low amount of Pt because the scarcity and high price of Pt hinder its practical applications. Here, we report the preparation of PtCoFe@CN electrocatalysts with a remarkably reduced Pt loading amount of 4.60% by annealing Pt-doped metal-organic frameworks (MOFs). The electrocatalyst demonstrated an outstanding performance with only 45 mV overpotential to achieve the 10 mA cm current density, which is quite close to that of the commercial 20% Pt/C catalyst. The enhanced catalytic capability is originated from the modification of the electronic structures of CoFe by alloying with Pt. The results indicate that robust and superstable alloy electrocatalysts which contain a very small amount of noble metal could be prepared by annealing noble metal-doped MOFs.
析氢反应高度依赖于铂电催化剂，其具有高活性和稳定性。在过去的几年中，人们在开发新型铂纳米结构方面做出了大量努力，铂纳米结构的铂载量较低，因为铂的稀缺性和高价格阻碍了其实际应用。在这里，我们报告了通过退火掺杂铂的金属有机骨架（MOFs）来制备 PtCoFe@CN 电催化剂，其铂载量显著降低至 4.60%。该电催化剂的性能非常出色，仅需 45 mV 的过电势即可实现 10 mA cm 的电流密度，这与商业 20%Pt/C 催化剂非常接近。增强的催化能力源于 Pt 与 CoFe 合金化对 CoFe 电子结构的修饰。结果表明，通过退火掺杂贵金属的 MOFs 可以制备出含有少量贵金属的稳定且超稳定的合金电催化剂。
