This paper describes the synthesis and catalytic activity of carbon-supported Pd/C, PdNi/C, and PdNiRh/C catalysts with core–shell morphologies towards the oxidation of ethanol in alkaline media. The catalysts are synthesised by a chemical reduction method using sodium borohydride as the reducing agent. Electrochemical characterisations show that the addition of Ni and Rh enhances remarkably the electrocatalytic activity of the materials due to the bifunctional and electronic effects in PdNi/C and PdNiRh/C catalysts, and the synergetic effect of the bifunctional and core–shell morphology on the Ni@Pd/C and Ni@PdRh/C catalysts. Electrochemical impedance spectra reveal lower values of charge transfer resistance for Pd₆₀Ni₂₀Rh₂₀/C and Ni₂₀@Pd₆₀Rh₂₀/C. Chronoamperometric tests also reveal the Ni₂₀@Pd₆₀Rh₂₀/C catalyst displays current densities 9.3 times higher than the Pd/C catalyst. The superior catalytic performance of the trimetallic core–shell Ni₂₀@Pd₆₀Rh₂₀/C catalyst can result from the synergy between the metals and the presence of core–shell morphology.

本文描述了碳-壳型Pd / C，PdNi / C和PdNiRh / C催化剂的合成和催化活性，这些催化剂具有核壳结构对碱性介质中乙醇的氧化。催化剂是使用硼氢化钠作为还原剂通过化学还原法合成的。电化学特性表明，由于PdNi / C和PdNiRh / C催化剂中的双功能和电子效应，以及Ni的双功能和核-壳形态的协同效应，Ni和Rh的添加显着增强了材料的电催化活性。 @ Pd / C和Ni @ PdRh / C催化剂。电化学阻抗谱显示Pd ₆₀ Ni ₂₀ Rh ₂₀ / C和Ni ₂₀的电荷转移电阻值较低@Pd ₆₀ Rh ₂₀ /℃。计时安培测试还显示，Ni ₂₀ @Pd ₆₀ Rh ₂₀ / C催化剂的电流密度比Pd / C催化剂高9.3倍。三金属核-壳Ni ₂₀ @Pd ₆₀ Rh ₂₀ / C催化剂的优异催化性能可以归因于金属之间的协同作用以及核-壳形态的存在。