题目：

Os/Si Nanocomposites as Excellent Hydrogen Evolution Electrocatalysts with Thermodynamically More Favorable Hydrogen Adsorption Free Energy than Platinum

作者：

Yafei Cheng¹, Xing Fan¹, Fan Liao, Shunkai Lu, Youyong Li, Liangbin Liu, Yanqing Li*,Haiping Lin*, Mingwang Shao*, Shuit-Tong Lee

单位：

Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University,Suzhou 215123, PR China

摘要：

The development of highly efficient electrocatalysts for hydrogen evolution reaction is a fundamental under taking of the hydrogen economy. Herein, we investigated the electrocatalytic performance of M/Si (M = Os, Rh, dPt, Pd, Re, Ru, Au or Ag) nanocomposites for hydrogen evolution reaction. The results show that Os/Si nanocomposites exhibit the best catalytic efficiency with a negligible onset overpotential (−25 mV), a small Tafelslope of −24 mV dec⁻¹ and remarkable long-term stability. Of most importance, at a current density of the typical industrial production (−1000 mA cm⁻²), the energy conversion efficiency of the Os/Si nanocomposite is 29.3% higher than that of the commercial 40 wt% Pt/C. The density functional calculations reveal that such outstanding catalytic activity of the Os/Si catalyst arises from the thermodynamically more favorable hydrogen adsorption free energy (ΔGH* = −0.03 eV) at the osmium/silicon interfaces than that on platinum(ΔGH* = −0.09 eV) or osmium (ΔGH* = −0.26 eV).

影响因子：

12.343

分区情况：

一区

链接：

http://www.sciencedirect.com/science/article/pii/S2211285517304226