Electroanalytical Probing of Triphasic Hydrogen Storage and Transport in Films of Nanoparticulate Polymer of Intrinsic Microporosity (PIM-1)

IF 2.7 4区化学 Q3 CHEMISTRY, PHYSICAL Electrocatalysis Pub Date : 2024-11-04 DOI:10.1007/s12678-024-00905-7

Adam Morris, Mariolino Carta, Neil B. McKeown, Philip J. Fletcher, Frank Marken

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Abstract

Preliminary experiments are reported to show quantitatively that hydrogen gas can be stored under triphasic conditions in wet nanoparticulate polymer of intrinsic microporosity (PIM-1) applied as a film to a platinum disk electrode surface. Based on chronoamperometric data, it is shown that the resulting triphasic interface is able to store hydrogen gas at apparent concentrations higher (3 orders of magnitude increase for an approx. 15 μm thick film with typically c_app,hydrogen = 80 mM; D_app,hydrogen = 1.2 × 10^–11 m²s⁻¹) than the known solubility of hydrogen gas in aqueous electrolyte (c_hydrogen = 0.08 mM; D_hydrogen = 5.0 × 10^–9 m²s⁻¹) at room temperature. Due to film roughness/heterogeneity, the apparent hydrogen concentration can only be estimated, but it increases with film thickness. At the same time the apparent diffusion coefficient is lowered considerably due to the molecularly rigid/glassy polymer host. The resulting modified electrode is investigated/proposed for energy storage applications with different amounts of PIM-1 nanoparticle deposits attached to the platinum surface.

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特性微孔纳米聚合物（PIM-1）薄膜中三相储氢输运的电分析研究

报告中的初步实验定量地表明，氢气可以在三相条件下储存在铂盘电极表面的本征微孔湿纳米聚合物（PIM-1）薄膜中。根据计时器数据显示，由此产生的三相界面能够储存氢气，其表观浓度比室温下氢气在水性电解质中的已知溶解度（chydrogen = 0.08 mM; Dhydrogen = 5.0 × 10-9 m2s-1）要高（对于厚度约为 15 μm 的薄膜，通常 capp,hydrogen = 80 mM; Dapp,hydrogen = 1.2 × 10-11 m2s-1，增加了 3 个数量级）。由于薄膜的粗糙度/异质性，表观氢浓度只能估算，但会随着薄膜厚度的增加而增加。同时，由于分子刚性/玻璃态聚合物的存在，表观扩散系数大大降低。研究/建议在铂表面附着不同数量的 PIM-1 纳米粒子沉积物，从而将所得到的改性电极用于储能应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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

期刊介绍： Electrocatalysis is cross-disciplinary in nature, and attracts the interest of chemists, physicists, biochemists, surface and materials scientists, and engineers. Electrocatalysis provides the unique international forum solely dedicated to the exchange of novel ideas in electrocatalysis for academic, government, and industrial researchers. Quick publication of new results, concepts, and inventions made involving Electrocatalysis stimulates scientific discoveries and breakthroughs, promotes the scientific and engineering concepts that are critical to the development of novel electrochemical technologies. Electrocatalysis publishes original submissions in the form of letters, research papers, review articles, book reviews, and educational papers. Letters are preliminary reports that communicate new and important findings. Regular research papers are complete reports of new results, and their analysis and discussion. Review articles critically and constructively examine development in areas of electrocatalysis that are of broad interest and importance. Educational papers discuss important concepts whose understanding is vital to advances in theoretical and experimental aspects of electrochemical reactions.