Stepwise Understanding on Hydrolysis Formation of the IrOx Nanoparticles as Highly Active Electrocatalyst for Oxygen Evolution Reaction

IF 2.7 4区 化学 Q3 CHEMISTRY, PHYSICAL Electrocatalysis Pub Date : 2024-05-21 DOI:10.1007/s12678-024-00874-x
Swapnil Sanjay Karade, Raghunandan Sharma, Martin Aage Barsøe Hedegaard, Shuang Ma Andersen
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Abstract

In this study, we have investigated the synthesis of supported iridium oxide (IrOx) nanoparticles (NPs) through hydrolysis in a surfactant-free aqueous bath as a possible route for the large-scale production of highly active electrocatalyst for oxygen evolution reaction (OER) in acidic water electrolyzers. The process involves (i) formation of Ir-hydroxides complex from an Ir precursor in basic media followed by (ii) protonation in acidic media to form colloidal hydrated IrOx NPs and (iii) conversion and deposition of IrOx NPs on the surface of carbon or TiN support by probe sonication. The IrOx NPs produced through hydrolysis route form highly stable colloidal solution. Since it is essential to precipitate the catalyst NPs from the colloidal solution for their use in water electrolyzer electrode development, here, we investigate the optimal reaction conditions, e.g., pH, temperature, time, and presence of support, for efficient synthesis of the catalyst NPs. The reaction intermediates formed at different reaction steps are explored to get insights into the chemistry of the process. Under the optimal synthesis conditions, 100% precipitation of IrOx NPs was achieved. Further, the precipitated TiN supported IrOx NPs exhibited high OER activity, superior to that of the commercial benchmark IrO2 electrocatalyst. The study provides a scalable synthesis route for highly active, low Ir-content OER electrocatalysts for acidic water electrolyzers.

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逐步了解作为氧进化反应高活性电催化剂的氧化亚铁纳米粒子的水解形成过程
在本研究中,我们研究了在无表面活性剂水浴中通过水解作用合成支撑型氧化铱(IrOx)纳米粒子(NPs),作为在酸性水电解槽中大规模生产高活性氧进化反应(OER)电催化剂的一种可能途径。该过程包括:(i) 在碱性介质中由 Ir 前体形成 Ir- 氢氧化物复合物;(ii) 在酸性介质中质子化形成胶体水合 IrOx NPs;(iii) 通过探针超声将 IrOx NPs 转化并沉积在碳或 TiN 载体表面。通过水解途径生成的 IrOx NPs 形成高度稳定的胶体溶液。由于从胶体溶液中析出催化剂 NPs 对其在水电解槽电极开发中的应用至关重要,因此我们在此研究了高效合成催化剂 NPs 的最佳反应条件,如 pH 值、温度、时间和是否存在支撑物。我们还探讨了在不同反应步骤中形成的反应中间产物,以深入了解该过程的化学原理。在最佳合成条件下,IrOx NPs 实现了 100% 沉淀。此外,沉淀的 TiN 支持的 IrOx NPs 表现出很高的 OER 活性,优于商用基准 IrO2 电催化剂。该研究为酸性水电解槽中高活性、低 Ir 含量的 OER 电催化剂提供了一条可扩展的合成路线。图表摘要
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来源期刊
Electrocatalysis
Electrocatalysis CHEMISTRY, PHYSICAL-ELECTROCHEMISTRY
CiteScore
4.80
自引率
6.50%
发文量
93
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.
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