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, Pd12Ru3/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, Pd12Ru3/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 Pd12Ru3/Ni(OH)2/C for the EOR is up to 3.724 A mgPdRu−1, ≈20 times higher than that of commercial Pd/C. Electrochemical in situ Fourier transform infrared measurements confirm the enhanced CO2 selectivity of Pd12Ru3/Ni(OH)2/C while synergistic and electronic effects of adjacent Ru, Pd, and OHad adsorption on Ni(OH)2 at low potential play a key role during EOR.
Hydroxide-supported atomic structures, particularly single atoms, offer a wide scope for active microenvironmental tuning to enhance catalytic performance, but little has been explored on the electronic synergy between mono- and...
A novel-Pd/CuO-Ni(OH)2/C catalyst with carbon black as support was successfully synthesized by hydrazine hydrate reduction and galvanic replacement strategies, subsequently tested for activity in the electrocatalytic oxidation of ethanol. The...
In this work, the Ru-based catalysts with the synthesized and commercial Mg(OH)2 and MgO as support were prepared at room temperature by a simple chemical reduction approach, such as Ru/Mg(OH)2(S)...
The development of single-atom catalysts with effective interfaces for biomass conversion is a promising but challenging research area. In this study, a Ru 1 /CoO x catalyst was successfully fabricated with the impregnation method, which featured Ru single atoms on a cobalt oxide substrate. The Ru 1 /CoO x catalyst showed superior performance in the selective electrooxidation of 5hydroxymethylfurfural (HMF) to produce 2,5-furandicarboxylic acid (FDCA), a high value-added product. The introduction of Ru single atoms with an ultralow loading of ∼0.5 wt % was revealed to accelerate the electroredox of Co 2+ /Co 3+ /Co 4+ and improve the intrinsic activity of the CoO x substrate with an FDCA selectivity of 76.5%, which is better than that of the pristine CoO x electrocatalysts (62.7%). The interfacial synergistic effect of the Ru 1 /CoO x interface clarified that Ru single atoms can enhance the adsorption of HMF at the Ru 1 /CoO x interface, which promoted the rate-determining step of the selective C−H bond activation for FDCA production. This finding provides valuable insights into the rational design of single-atom catalysts with functional interfaces for biomass upgrading.
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