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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：酸性水溶液中铂纳米粒子稀疏阵列的氧还原：过氧化氢作为释放的两个电子中间体

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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生成稀疏的铂纳米粒子阵列。具体而言，在30 M和15秒的沉积时间下，从1 mM的H2PtCl6在0.5 M的H2SO4中进行电沉积可产生0.46％至1.96％的表面覆盖率以及直径为29 nm至136 nm的纳米粒子。在表面覆盖率为0.46％的29 nm纳米颗粒阵列上的氧还原显示伏安信号，其扫描速率依赖性与O2到H2O2的两个电子还原一致，速率与k0 exp（-α（E-E_f （〜0）/ RT）和-0.058 V vs. SHE的形式电位（E_f〜0），〜10 cm s〜（-1）的标准电化学速率常数（k0）和0.23的转移系数（a）。在较高的Pt纳米颗粒覆盖率下，扫描速率依赖性变得明显，这与将H2O2进一步部分还原为水相一致。

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