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• W4300963119 endingPage "167379" @default.
• W4300963119 startingPage "167379" @default.
• W4300963119 abstract "The development of high electrocatalytic activity and low-cost Pt-containing catalyst is highly feasible for hydrogen evolution reactions under alkaline conditions. In this study, a series of three-dimensional (3D) rose-shaped cerium (IV) oxide (CeO 2 )-supported Pt and Ni alloy nanocomposite catalysts were prepared by a direct solvothermal method (Pt x Ni y @CeO 2 ), and the catalytic activity of the prepared catalysts in hydrogen evolution reactions was studied. The experimental results show that the rose-shaped CeO 2 as a carrier can provide abundant oxygen vacancies, and when combined with Pt and Ni, it will trigger the rearrangement of metal electrons. At the same time, this special structure can provide a larger specific surface area and expose more active sites. Bimetallic catalysts have higher hydrogen evolution reaction (HER) activity than monometallic catalysts due to the interaction between metals. In the composite catalyst with a molar ratio of Pt to Ni of 1:1 (Pt 1 Ni 1 @CeO 2 ), electrons are transferred from Ni to Pt. At this time, the catalyst exhibits the most excellent HER catalytic performance. Exhibits low HER overpotential (59 mV) and Tafel slope (56.50 mV dec -1 ) at a current density of 10 mA cm -2 . In addition, the composite catalyst exhibits distinguished long-term electrochemical stability within 15 hours. This work provides new possibilities for the effective combination of rare earth oxides and Pt-based materials as high-efficiency HER electrocatalysts under alkaline conditions. The rose-shaped CeO 2 endows the PtNi@CeO 2 composite catalyst with a high specific surface area. The oxygen vacancies provided by CeO 2 and the alloying of active components effectively improve the electronic structure of the catalyst and successfully improve the hydrogen evolution reaction activity. • The rose-shaped cerium oxide provides a larger specific surface area for the catalyst. • The Pt and Ni bimetallic nanoparticles exist in the form of alloys, and the electron transfer between them effectively improves the HER catalytic activity. • CeO 2 provides abundant oxygen vacancies, which effectively promote electron transfer between metals." @default.
• W4300963119 created "2022-10-04" @default.
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• W4300963119 date "2023-01-01" @default.
• W4300963119 modified "2023-09-24" @default.
• W4300963119 title "Directed self-assembled pathways of 3D rose-shaped PtNi@CeO2 electrocatalyst for enhanced hydrogen evolution reaction" @default.
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• W4300963119 doi "https://doi.org/10.1016/j.jallcom.2022.167379" @default.
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