Phosphorus-doped Fe3O4 nanoflowers grown on 3D porous graphene for robust pH-Universal hydrogen evolution reaction. (7th February 2020)

• Record Type: Journal Article
• Authors: Li, Shuo; Jian, Xue; Liu, Jinzhe; Guo, Shouzhi; Zhou, Chencheng; Zhang, Peilin; Yang, Yun; Chen, Luyang
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 7(2020)
• Page Start: 4435
• Page End: 4443
• Publication Date: 2020-02-07
• Subjects: 3D graphene -- Phosphorus-doping -- Fe3O4 nanoflowers -- Hydrogen evolution reaction -- pH-universal; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.12.024
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: It is extremely necessary to develop highly efficient and low-cost non-noble metal electrocatalysts for hydrogen evolution reaction (HER) under a pH-universal condition in the realm of sustainable energy. Herein, we have successfully prepared phosphorus doped Fe3 O4 nanoflowers on three-dimensional porous graphene (denoted as P–Fe3 O4 @3DG) via a simple hydrothermal and low-temperature phosphating reaction. The P–Fe3 O4 @3DG hybrid composite not only demonstrates superior performance for HER in 1.0 M KOH with low overpotential (123 mV at 10 mA/cm 2 ), small Tafel slope (65 mV/dec), and outstanding durability exceeding 50 h, but also exhibits satisfying performances under neutral and acidic medium as well. The 3D graphene foam with large porosity, high conductivity, and robust skeleton conduces to more active sites, and faster electron and ion transportation. The phosphorus dopant provides low Gibbs free energy and ability of binging H + . The synergistic effect of 3DG substrate and P–Fe3 O4 active material both accelerates the catalytic activity of Fe-based hybrid composite for HER. Highlights: 3DG acts as a substrate with large surface area, low resistance and strong skeleton. The unique 3D P–Fe3 O4 nanoflowers provides more active sites for proton adsorption. The reaction kinetics of HER can be apparently enhanced through phosphorus doping.