▎ 摘　　要

Designing a precious-metal-free catalyst with high activity and stability is of great significance for hydrogen evolution reaction (HER). Herein, sulfur (S) and phosphorus (P) co-doped graphene (SPG) is successfully synthesized via a facile hydrothermal process using sulfuric acid and phytic acid as sulfur and phosphorus dopant. Subsequently, two types of nickel-based nanomaterials grown directly on SPG (abbreviated as Ni/SPG and NiO/SPG) are fabricated through a simple alcohol-thermal method. The as-prepared Ni/SPG electrocatalyst display unexpected HER performance with extremely small impedance (0.48 Omega), wonderful electrochemically active surface areas (32.6 m(2)/g), high TOF (0.0051 s(-1)), low initial potential (25 mV), excellent Tafel slope (79 mV decade(-1)) and more excellent stable cycle stability (5000 cyclic voltammetry cycles). These remarkable electrocatalytic properties are attributed to the S and P dual-doping graphene producing more exposed active sites and surface defects, which allows Ni with small crystallite size uniformly dispersed on its surface and the facilitated electron transport between them. (C) 2019 Elsevier B.V. All rights reserved.