题目：

Rh�Ag�Si Ternary Composites: Highly Active Hydrogen Evolution Electrocatalysts over Pt�Ag�Si

作者：

Binbin Jiang ,Yuyang Sun ,Fan Liao *,Wen Shen ,Haiping Lin *,Hui WangandMingwang Shao*

单位：

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

摘要：

Hydrogen production with the aid of electrocatalysis is a critical component for several developing clean-energy technologies. Such a renewable energy depends heavily on the choice of cheap and efficient catalysts for hydrogen evolution, which has still been a challenge until now. In this work, the theoretical calculation indicates that Rh�Ag�Si ternary catalysts exhibit more active hydrogen evolution performance than Pt�Ag�Si because the migration activation energies of H atoms from Rh(111) to Si are lower than those from Pt(111) to Si via the Ag surface. This simulation was confirmed by the experimental results: Rh�Ag/SiNW (or Pt�Ag/SiNW) catalysts were prepared by directly reducing Rh (or Pt) and Ag ions with Si�H bonds. The Rh�Ag/SiNW-2 with the optimal mass ratio of 2.3: 23.4: 74.3 (Rh: Ag: Si) exhibited a lower Tafel slope (51 mV dec⁻¹) and a larger exchange current density (87.1 × 10−6 A cm⁻²) than the Pt�Ag/SiNW. In addition, the mass activity of Rh�Ag/SiNW-2 at an overpotential of 0.2 V (11.5 mA μg_Rh⁻¹) is 12.0, 5.0 and 3.3 fold higher than that of Rh�Ag (0.96 mA μg_Rh⁻¹), Pt�Ag/SiNW (2.3 mA μg_Pt⁻¹) and 40 wt% Pt/C (3.5 mA μg_Pt⁻¹) catalysts, respectively. Moreover, the Rh�Ag/SiNW nanocatalysts had good stability in acidic media. The results presented herein may offer a novel and effective methodology for the designing of cost-efficient and environmentally friendly catalysts for electrochemical fields.

影响因子：

8.867

分区情况：

一区

链接：

http://pubs.rsc.org/-/content/articlehtml/2017/ta/c6ta09619k