Details

Autor(en) / Beteiligte

• Han, Li-Ping
• Yao, Rui-Qi
• Wan, Wu-Bin
• Shi, Hang
• Wen, Zi
• Lang, Xing-You
• Jiang, Qing

Titel

Hierarchical nanoporous intermetallic compounds with self-grown transition-metal hydroxides as bifunctional catalysts for the alkaline hydrogen evolution reaction

Ist Teil von

• Journal of materials chemistry. A, Materials for energy and sustainability, 2019, Vol.7 (45), p.25925-25931

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The hydrogen evolution reaction (HER) is a crucial step in alkaline water electrolysis, but suffers from sluggish reaction kinetics, which calls for the development of active and robust catalysts for the highly efficient production of high-purity hydrogen. Here, we report hierarchical nanoporous (NP) transition-metal (TM = Fe, Co)-doped Pt 3 Al intermetallic compounds, which are composed of surface alloys of Pt and TMs with in situ self-grown TM hydroxides in an alkaline environment, NP (Pt 1− x TM x ) 3 Al/Pt-TM(OH), as highly efficient bifunctional catalysts for the HER. By virtue of the constituent Co(OH) 2 having moderate hydroxyl adsorption to accelerate water dissociation and the Pt atoms facilitating the adsorption/desorption of reactive hydrogen intermediates, the NP (Pt 1− x Co x ) 3 Al/Pt-Co(OH) 2 exhibits superior HER activity in 0.1 M KOH, with a low Tafel slope of 48 mV dec −1 and an overpotential of ∼43 mV at 10 mA cm −2 , as well as exceptional durability due to its unique nanoporous structure with stable intermetallic bonds. These electrocatalytic properties outperform state-of-the-art Pt-based catalysts, suggesting that multi-site design is suitable for producing highly efficient catalysts towards the HER in alkaline environments. Transition metal (TM)-doped intermetallic compounds that are composed of a surface Pt-TM alloy with a self-grown hydroxide serve as bifunctional alkaline HER catalysts.