Ethanol as a fuel for direct ethanol fuel cells (DEFCs) has the advantages of being highly energetic, environmentally friendly, and low−cost, while the slow anodic ethanol oxidation reaction (EOR), intermediate poisoning effect, and incomplete oxidation of ethanol became obstacles to the development of DEFCs. Herein, a 2D ternary cyclic Pd3Pt1Rh0.1 nanorings (NRs) catalyst with efficient EOR performance is prepared via a facile one−pot solvothermal approach, and systematic studies are carried out to reveal the mechanisms of the enhanced performance and C−C bond selectivity. In particular, the optimized catalyst exhibits impressive mass activity, stability, toxicity resistance, and C−C bond cleavage ability. It's proposed that the considerable performance is attributed to the unique hollow structure, providing abundant active sites. The high toxicity resistance is not only attributed to the electronic modulation of the catalyst material by Rh atoms, but also depends on the excellent water activation properties of Rh, which contribute to the removal of intermediates, such as CO. In addition, the density functional theory calculations showed that the introduction of Rh significantly enhances the C−C bond cleavage ability of the catalyst, further improving the EOR activity.
The electrochemical performance of manganese dioxides in aqueous zinc-ion batteries (ZIBs) is still impeded by inferior conductivity and sluggish chemical kinetics. This paper combines atomic modification and structure engineering strategy...
Direct ethanol fuel cells (DEFCs) are considered one of the most promising energy resources for portable power devices. The current mainstream catalysts used for DEFCs are Pt-or Pd-based, which facilitate the partial oxidation of ethanol to CH 3 CHO or CH 3 COOH, but not the C-C bond cleavage, which is the inevitable path for the complete oxidation of ethanol. In addition, most noble catalysts are easily poisoned by CO, shortening their lifespan and stability, thus inhibiting the practical application of the catalysts. Herein, we report a type of ultrathin trimetallic Pt/Ni/Rh nanowires with various Rh contents toward the ethanol oxidation reaction (EOR), and the optimized Pt 6 Ni 2 Rh 3 /C demonstrates a high mass activity of 1.16 A mg Pt −1 as well as considerable stability, anti-CO poisoning ability, and complete ethanol oxidation selectivity. In addition, density functional theory calculations reveal that introducing Rh to bimetallic Pt/Ni endows the catalyst with a moderate intermediate adsorption capacity and enhanced C-C bond cleavage capacity, favorable for the complete oxidation of ethanol.
Ethanol Oxidation Reaction
In article number 2203506, Xinlong Tian and co‐workers prepare 2D ternary Pd3Pt1Rh0.1 nanorings with efficient ethanol oxidation reaction performance via a facile one‐pot solvothermal approach, and systematic studies are carried out to reveal the mechanisms of the enhanced performance and C–C bond selectivity. The density functional theory calculations show that the introduction of Rh significantly enhances the C–C bond cleavage ability of the catalyst.
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