Ultrafine Pt-based catalyst decorated with oxygenophilic Ni-sites accelerating alkaline H 2 O dissociation for efficient hydrogen evolution
Journal of Colloid and Interface Science, ISSN: 0021-9797, Vol: 650, Issue: Pt B, Page: 1715-1724
2023
- 9Citations
- 3Captures
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Article Description
Although Pt is a widely adopted commercial catalyst for the hydrogen evolution reaction (HER), its practical application is greatly limited by its prohibitive cost and high energy barrier for H 2 O dissociation in alkaline media. Herein, an ultrafine Pt-based catalyst decorated with oxygenophilic Ni-sites is rationally designed and successfully synthesized with Pt 5 (GS) 10 (HGS = l -reduced glutathione) nanocluster precursor. The optimized Ni-decorated Pt catalyst (Ni-Pt-C-500) with ultrafine nanoparticles (about 1.6 nm) exhibits a low overpotential (14.0 mV) at 10 mA cm −2 and a mild Tafel slope of 20.8 mV dec −1 in the HER, which is superior to its undecorated counterpart (Pt-C-500), the commercial 20 wt% Pt/C catalyst and most of the previously reported Pt-based electrocatalysts. Experimental observations and theoretical calculations indicate that H 2 O could be spontaneously adsorbed to Ni-sites of the Ni-Pt-C-500 catalyst. Mechanistic studies reveal that Ni-sites promote HER by accelerating the kinetic of H 2 O cleavage and optimizing the electronic structure of Pt. This work paves a new avenue for designing other ultrafine hybrid electrocatalysts based on metal nanoclusters to enhance catalytic reaction kinetics.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0021979723013723; http://dx.doi.org/10.1016/j.jcis.2023.07.119; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85165640207&origin=inward; http://www.ncbi.nlm.nih.gov/pubmed/37499627; https://linkinghub.elsevier.com/retrieve/pii/S0021979723013723; https://dx.doi.org/10.1016/j.jcis.2023.07.119
Elsevier BV
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