Journal
CHEMICAL ENGINEERING JOURNAL
Volume 399, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.125810
Keywords
Phosphorus doping; Multi-metallic composition; Hierarchical dendritic nanostructure; Electrocatalyst; Hydrogen evolution reaction
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Funding
- National Natural Science Foundation of China [21776255, 21701141, 21972126, 21978264, 21905250]
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The development of effective and stable catalysts for hydrogen evolution reaction (HER) is desired for hydrogen production. Herein, we report a facile solvothermal approach to fabricate P-doped triangular PtPdCu nanodarts (PtPdCu-P NDs) using trioctylphosphine as phosphorus dopant. The PtPdCu-P NDs with separated branches can provide high surface areas and sufficient active sites for HER. Moreover, the incorporation of phosphorus into alloys can tailor the electronic structure and the d-band electron density of metals, which is beneficial for adsorption of hydrogen intermediates. Additionally, the phosphorus doping can effectively inhibit the metal dissolution during the electrolysis. Therefore, the PtPdCu-P NDs achieve a very low overpotential of 12 mV at current density of 10 mA cm(-2), rapid kinetics (Tafel slope: 29 mV dec(-1)) in 0.5 M H2SO4, superior to the undoped PtPdCu NDs. Moreover, the PtPdCu-P NDs also exhibit excellent stability, without obvious structure change and activity degradation after 10,000 cycles and 50-h electrolysis. This P-doping strategy is a universal approach to incorporate phosphorus into various nanomaterials without the change of the overall morphology, which holds a high potential in the water electrolysis.
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