Enhanced electro-catalytic activity of carbon-supported PtRh nano-catalysts for ethanol electro-oxidation in low-temperature fuel cell

IF 2.6 4区化学 Q3 CHEMISTRY, PHYSICAL Ionics Pub Date : 2025-01-21 DOI:10.1007/s11581-024-06053-8

Susmita Singh, Moupiya Ghosh, Mainak Bose, Anushna Dutta, Sinthia Saha, Chandan Ghorui, A. K. Chaudhary

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Abstract

The introduction of noble metal Rh on a Pt surface significantly enhances the cleavage of C–C bonds. Rhodium possesses notable characteristics for C–C bond cleavage, thereby promoting the complete oxidation of ethanol. This research is focused on chemically synthesized nanoparticles of PtRh with three distinct bimetallic variations, supported on multiwalled carbon nanotube (MWCNT) in view of enhancing the electro-oxidation of ethanol. The crystallite size and structural and morphological characterization of the electrocatalysts reveal that MWCNT-supported PtRh electrocatalysts were effectively synthesized, in accordance with the characterization findings. It was determined that the electronic structure of Pt is modified after the incorporation of Rh into Pt-based electrocatalysts. The synthesized electrocatalysts underwent different types of electrochemical studies such as electrochemical impedance spectroscopy (EIS), chronoamperometry (CA), cyclic voltammetry (CV), and linear sweep voltammetry (LSV) in order to understand their catalytic activities during the electrooxidation reaction (EOR) of ethanol. This research aims to develop a structure and function relationship of the synthesized electrocatalyst for the EOR. It was found that the oxidation peak current efficiency was sufficiently higher as well as the minimum onset potential was notably lower for the C/Pt₅₀Rh₅₀ electrocatalyst compared to others. Also, it has low charge transfer resistance and low poisoning rate for ethanol oxidation. Thus, the synthesis and rational design of active nanoalloy electrocatalysts for direct ethanol fuel cells (DEFCs) can enhance electrochemical activities.

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碳负载PtRh纳米催化剂在低温燃料电池中对乙醇电氧化活性的增强

贵金属Rh在Pt表面的引入显著增强了C-C键的解理。铑具有明显的C-C键解理特性，从而促进乙醇的完全氧化。本文主要研究了在多壁碳纳米管（MWCNT）上化学合成具有三种不同双金属变化的PtRh纳米颗粒，以增强乙醇的电氧化作用。电催化剂的晶体尺寸和结构形态表征表明，mwcnt负载的PtRh电催化剂是有效合成的，与表征结果一致。结果表明，Rh加入Pt基电催化剂后，Pt的电子结构发生了改变。通过电化学阻抗谱（EIS）、计时电流法（CA）、循环伏安法（CV）和线性扫描伏安法（LSV）等电化学方法研究合成的电催化剂在乙醇电氧化反应（EOR）中的催化活性。本研究旨在建立提高采收率电催化剂的结构与功能关系。结果表明，C/Pt50Rh50电催化剂的氧化峰电流效率足够高，最小起始电位明显低于其他电催化剂。对乙醇氧化具有低的电荷转移阻力和低的中毒率。因此，合成和合理设计活性纳米合金电催化剂可以提高直接乙醇燃料电池（DEFCs）的电化学活性。图形抽象

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来源期刊

Ionics 化学-电化学

CiteScore

5.30

自引率

7.10%

发文量

427

审稿时长

2.2 months

期刊介绍： Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.