In:
Energy & Environmental Science, Royal Society of Chemistry (RSC), Vol. 16, No. 3 ( 2023), p. 1035-1048
Abstract:
Hydroxide-supported atomic structures, particularly single atoms, offer a wide scope for active microenvironmental tuning to enhance the catalytic performance, but little has been explored on the electronic synergy between mono- and dual-hydroxides. Here, we propose a way of constructing a Pt 1 /(Co,Ni)(OH) 2 /C single-atom catalyst (SAC), with Pt single-atoms, Pt 1 , stabilized and anchored on the surface of defective (Co,Ni)(OH) 2 , which is further supported on carbon black. This catalyst exhibits a far superior hydrogen evolution reaction (HER) activity to Pt 1 /Co(OH) 2 /C, Pt 1 /Ni(OH) 2 /C, Pt 1 /C, and the commercial 20 wt% Pt/C. Particularly, it shows an almost zero onset overpotential and an outstanding electrocatalytic mass activity for the HER, 29.7 times higher than that of Pt 1 /C and 115.9 times higher than that of the commercial 20 wt% Pt/C at −0.09 V vs. RHE, respectively. There is negligible attenuation after the chronopotentiometry test at 100 mA cm −2 for 24 h and cyclic voltammetry for 20 000 cycles. Operando Raman spectra clarified that the Volmer step for water decomposition (the H–OH bond breaking) takes place around the defective sites of (Co,Ni)(OH) 2 . Density functional theory (DFT) calculations confirmed the electronic synergy between the Pt single atoms and bimetallic (Co,Ni)(OH) 2 , which leads to stable anchoring of Pt and yields an appropriate adsorption energy of *H, leading to rapid H 2 generation.
Type of Medium:
Online Resource
ISSN:
1754-5692
,
1754-5706
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
2439879-2
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