Abstract
Driven by the persisting poor understanding of the slow kinetics of hydrogen evolution (HER) on Pt-based alloys in alkaline media, it is necessary and challenging to explore the clear relationship between heterogeneous interface components and activity. Herein, we develop an exquisite triphasic interfacial structure featuring the Sb-doped SnO2 (ATO)-supported NiO/PtNi heterojunction with controllable heterogeneous interface. The strong electron-donating effect of the ATO carrier and the electronic coupling between PtNi and appropriate NiO components effectively optimize the adsorption of H2O* and dissociation of H*, especially the adsorption-dissociation of H2O on the NiO site (Volmer step), thus accelerating the overall alkaline HER kinetics. The resulting catalyst delivers high alkaline HER performances with a low Tafel slope (only 25.5 mV dec−1) and an ultra-long stability of 140 h operation. Our findings provide new insights into breaking the water dissociation limit of Pt-based catalysts by rational design of heterogeneous interfaces.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
