▎ 摘　　要

Highly efficient and stable electrocatalyst for hydrogen evolution reaction (HER) is essential for the application of green hydrogen energy. To date, platinum-based materials are the most efficient electrocatalyst. Developing inexpensive electrocatalyst with low Pt loading and high platinum utilization efficiency is one of effective strategies to lower the cost of platinum-based electrocatalyst. In this paper, it was demonstrated that ultrafine and uniform distribution platinum nanoparticles could be synthesized on three-dimensional sulfur-doped graphene materials (Pt/3DSG) via covalent cross-linking between platinum and doped sulfur atoms. The high conductive 3DSG not only facilitates the electron transport but also serves as a template for depositing ultrafine and uniform platinum nanoparticles. The Pt/3DSG with low Pt loading (3.1 wt%) delivers extremely outstanding HER performance, which is superior to the commercial 20 wt% Pt/C catalyst. The turnover frequencies (TOFs) of Pt/3DSG can reach 1.12 s(-1), which is larger than that of 20% Pt/C (0.71 s(-1)). Furthermore, the stability is also superior than that of Pt/C. This work provides a rational design strategy for highly efficient and stable electrocatalysts with low loading and high utilization of precious metal. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.