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首页> 外文期刊>Journal of power sources >Enhancement of ethanol oxidation at Pt and PtRu nanoparticles dispersed over hybrid zirconia-rhodium supports
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Enhancement of ethanol oxidation at Pt and PtRu nanoparticles dispersed over hybrid zirconia-rhodium supports

机译：分散在杂化氧化锆-铑载体上的Pt和PtRu纳米颗粒上的乙醇氧化作用增强

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摘要

A catalytic material for electrooxidation of ethanol that utilizes PtRu nanoparticles dispersed over thin films of rhodium-free and rhodium-containing zirconia (ZrO_2) supports is described here. The enhancement of electrocatalytic activity (particularly in the potential range as low as 0.25-0.5 V vs. RHE), that has been achieved by dispersing PtRu nanoparticles (loading, 100 μg cm~(-2)) over the hybrid Rh -ZrO_2 support composed of nanostructured zirconia and metallic rhodium particles, is clearly evident from comparison of the respective voltammetric and chronoamperometric current densities recorded at room temperature (22 ℃) in 0.5 mol dm~(-3) H_2SO_4 containing 0.5 mol dm~(-3) ethanol. Porous ZrO_2 nanostructures, that provide a large population of hydroxyl groups in acidic medium in the vicinity of PtRu sites, are expected to facilitate the ruthenium-induced removal of passivating CO adsorbates from platinum, as is apparent from the diagnostic experiments with a small organic molecule such as methanol. Although Rh itself does not show directly any activity toward ethanol oxidation, the metal is expected to facilitate C-C bond splitting in C_2H_5OH. It has also been found during parallel voltammetric and chronoamperometric measurements that the hybrid Rh-ZrO_2 support increases activity of the platinum component itself toward ethanol oxidation in the low potential range.
机译：本文描述了一种乙醇电催化催化剂，该催化剂利用分散在无铑和含铑氧化锆（ZrO_2）载体薄膜上的PtRu纳米颗粒。通过将PtRu纳米颗粒（负载量为100μgcm〜（-2））分散在Rh-ZrO_2杂化载体上可以实现电催化活性的增强（特别是在相对RHE的低至0.25-0.5 V的电位范围内）通过比较室温（22℃）在含有0.5 mol dm〜（-3）乙醇的0.5 mol dm〜（-3）H_2SO_4中在室温（22℃）下记录的伏安和计时电流密度，可以清楚地看出由纳米结构的氧化锆和金属铑颗粒组成的。多孔ZrO_2纳米结构可在酸性介质中的PtRu位点附近提供大量的羟基，有望促进钌诱导的从铂中去除钝化的CO吸附物，这是通过一个小的有机分子进行的诊断实验得出的如甲醇。尽管Rh本身并未直接显示出对乙醇氧化的任何活性，但人们预计该金属会促进C_2H_5OH中的C-C键分裂。在平行伏安法和计时电流法测量中还发现，杂化的Rh-ZrO_2载体在低电势范围内增加了铂组分本身对乙醇氧化的活性。

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