In:
Advanced Functional Materials, Wiley, Vol. 32, No. 51 ( 2022-12)
Abstract:
The rational fabrication of Pt‐free catalysts for driving the development of practical applications in alkaline water electrolysis and fuel cells is promising but challenging. Herein, a promising approach is outlined for the rational design of multimetallic catalysts comprising multiple active sites including Pd nanoclusters and Ru single atoms anchored at the defective sites of Ni(OH) 2 to simultaneously enhance hydrogen evolution reactions (HER) and ethanol oxidation reactions (EOR). Remarkably, Pd 12 Ru 3 /Ni(OH) 2 /C exhibits a remarkably reduced HER overpotential (16.1 mV@10 mA cm −2 with a Tafel slope of 21.8 mV dec −1 ) as compared to commercial 20 wt.% Pt/C (26.0 mV@10 mA cm −2 , 32.5 mV dec −1 ). More importantly, Pd 12 Ru 3 /Ni(OH) 2 /C possesses a self‐optimized overpotential to 12.5 mV@10 mA cm −2 after 20 000 cycles stability test while a significantly decreased performance for commercial 20wt.% Pt/C (64.5 mV@10 mA cm −2 after 5000 cycles). The mass activity of Pd 12 Ru 3 /Ni(OH) 2 /C for the EOR is up to 3.724 A mg PdRu −1 , ≈20 times higher than that of commercial Pd/C. Electrochemical in situ Fourier transform infrared measurements confirm the enhanced CO 2 selectivity of Pd 12 Ru 3 /Ni(OH) 2 /C while synergistic and electronic effects of adjacent Ru, Pd, and OH ad adsorption on Ni(OH) 2 at low potential play a key role during EOR.
Type of Medium:
Online Resource
ISSN:
1616-301X
,
1616-3028
DOI:
10.1002/adfm.202208587
Language:
English
Publisher:
Wiley
Publication Date:
2022
detail.hit.zdb_id:
2029061-5
detail.hit.zdb_id:
2039420-2
SSG:
11
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