Ethanol Electrolysis at Carbon-Supported PtRhSn, PtRhNi, and PtRhRu Ternary Alloy Nanoparticles in a Proton Exchange Membrane Cell

IF 2.7 4区化学 Q3 CHEMISTRY, PHYSICAL

Electrocatalysis Pub Date : 2025-02-12 DOI:10.1007/s12678-025-00939-5

Ahmed Hashem Ali, Peter G. Pickup

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Abstract

Electrolysis of ethanol to produce green hydrogen, with less electrical energy than for water electrolysis, is potentially an attractive sustainable energy technology. However, more efficient anode catalysts are required, and the production of acetic acid and acetaldehyde by-products must be considered. PtRhM (M = Sn, Ni, Ru) catalysts can potentially combine the high activities of PtM catalysts with the enhanced selectivity of PtRh for breaking the ethanol C–C bond, which increases hydrogen production. The purpose of this work was to compare these catalysts in a proton exchange membrane (PEM) cell and measure stoichiometries and product distributions. The results show that although Sn, Ni, and Ru all enhance the activity of PtRh at low potentials for cyclic voltammetry in H₂SO₄(aq), only Ru had a significant effect in the PEM cell. However, Ni enhanced selectivity for breaking the C–C bond, while Ru and Sn both decreased selectivity. Consequently, PtRhNi appears to be most suitable for production of hydrogen from ethanol oxidation, because it provides the optimum balance between the electrical energy required, current density, and hydrogen/ethanol ratio (higher stoichiometry).

Graphical Abstract

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质子交换膜细胞中碳负载PtRhSn， PtRhNi和PtRhRu三元合金纳米颗粒的乙醇电解

电解乙醇生产绿色氢，比电解水所需的电能少，是一种潜在的有吸引力的可持续能源技术。然而，需要更高效的阳极催化剂，并且必须考虑产生乙酸和乙醛副产物。PtRhM （M = Sn, Ni, Ru）催化剂可以将PtM催化剂的高活性与PtRh对乙醇C-C键的选择性增强结合起来，从而增加产氢量。这项工作的目的是比较这些催化剂在质子交换膜（PEM）电池和测量化学计量学和产物分布。结果表明，虽然Sn、Ni和Ru在H2SO4（aq）循环伏安的低电位下都能增强PtRh的活性，但在PEM电池中只有Ru有显著的作用。然而，Ni提高了C-C键断裂的选择性，而Ru和Sn都降低了选择性。因此，PtRhNi似乎最适合乙醇氧化制氢，因为它提供了所需电能、电流密度和氢/乙醇比（更高的化学计量）之间的最佳平衡。图形抽象

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来源期刊

Electrocatalysis CHEMISTRY, PHYSICAL-ELECTROCHEMISTRY

CiteScore

4.80

自引率

6.50%

发文量

审稿时长

>12 weeks

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