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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Oxygen reduction at sparse arrays of platinum nanoparticles in aqueous acid: hydrogen peroxide as a liberated two electron intermediate
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Oxygen reduction at sparse arrays of platinum nanoparticles in aqueous acid: hydrogen peroxide as a liberated two electron intermediate

机译:铂纳米颗粒含水酸稀疏阵列的氧气减少:作为释放的两电子中间体过氧化氢

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摘要

Electrodeposition methods are used to generate a sparse array of platinum nanoparticles on a glassy carbon electrode. Specifically electrodeposition from a 1 mM solution of H2PtCI6 in 0.5 M H2SO4 leads to surface coverages of 0.46% to 1.96% and nanoparticles of size 29 nm to 136 nm in diameter, using deposition times of 30 and 15 seconds. The reduction of oxygen at an array of 29 nm nanoparticles with a surface coverage of 0.46% showed voltammetric signals with a scan rate dependence consistent with a two electron reduction of O2 to H2O2 with the rate proportional to k0 exp(-α(E-E_f~0)/RT) and formal potential (E_f~0) of -0.058 V vs. SHE, a standard electrochemical rate constant (k0) of ~10 cm s~(-1) and a transfer coefficient (a) of 0.23. At higher Pt nanoparticle coverages, a scan rate dependence consistent with the partial further reduction of H2O2 to water becomes evident.
机译:电沉积方法用于在玻璃碳电极上产生纯铂纳米颗粒的稀疏阵列。 特别是从0.5M H 2 SO 4中的1mM的H2PTCI6溶液的电沉积导致直径为0.46%至1.96%和六个尺寸为29nm至136nm的表面覆盖物,使用30和15秒的沉积时间。 在29nm纳米粒子的阵列中的氧气的减少,表面覆盖为0.46%,显示伏安信号,其扫描速率依赖性与O2到H2O2的两个电子减少一致,其速率与K0 exp(-α(e-e_f 〜0)/ RT)和-0.058 V与SHE的正式电位(E_F〜0),标准电化学率常数(K0)〜10cm S〜(-1),转移系数(a)为0.23。 在较高的Pt纳米粒子覆盖范围内,扫描速率依赖性与部分进一步降低到水的均匀依赖性变得明显。

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    Department of Chemistry Physical and Theoretical Chemistry Laboratory University of Oxford South Parks Road Oxford UK OX1 3QZ.;

    Department of Chemistry Physical and Theoretical Chemistry Laboratory University of Oxford South Parks Road Oxford UK OX1 3QZ.;

    Department of Materials Begbroke Science Park Sandy Lane Yarnton Oxford 0X5 1PF UK;

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  • 正文语种 eng
  • 中图分类 物理学;化学;
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