Enhancing Iridium Nanoparticles’ Oxygen Evolution Reaction Activity and Stability by Adjusting the Coverage of Titanium Oxynitride Flakes on Reduced Graphene Oxide Nanoribbons’ Support,Advanced Materials Interfaces

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Enhancing Iridium Nanoparticles’ Oxygen Evolution Reaction Activity and Stability by Adjusting the Coverage of Titanium Oxynitride Flakes on Reduced Graphene Oxide Nanoribbons’ Support
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2021-08-17 , DOI: 10.1002/admi.202100900
Léonard Moriau _{1,

2} , Gorazd Koderman Podboršek _{1,

2} , Angelja Kjara Surca ₁ , Sorour Semsari Parpari ₃ , Martin Šala ₄ , Urša Petek ₁ , Marjan Bele ₁ , Primož Jovanovič ₁ , Bostjan Genorio ₅ , Nejc Hodnik _{1,

2,

6}

Affiliation

Hydrogen production from solar energy is currently considered the best alternative to fossil fuels. Thus, materials enabling efficient and sustainable energy conversion and storage need to be developed. Iridium is still the only material used in proton exchange membrane electrolyzers that efficiently catalyze hydrogen evolution counter-reaction, namely, the oxygen evolution reaction (OER) for electrochemical water splitting in acidic media. With no practical alternatives that can sustain the harsh reaction conditions, new approaches need to be developed to increase the utilization of this scarce metal. Hereby, a carbon–ceramic nanocomposite material is investigated, where Ir nanoparticles and nanoflakes of titanium oxynitride (TiON_x) are deposited on the surface of reduced graphene oxide nanoribbons (rGONRs). OER performance is shown to be dependent on the mutual distribution of the Ir–TiON_x–rGONR phases and in the best case leads up to 30 times higher activity relative to the commercial IrO₂ benchmark. Adjusting the domains of different chemical nature within the same hybrid nanocomposite material through the formation of heterojunctions is shown to boost OER performance. This work demonstrates how fine-tuning of morphology, composition, and particle distribution of the carbon–ceramic catalytic material can introduce a strong synergistic effect on OER activity and stability of iridium.

中文翻译：

通过调整氮氧化钛薄片在还原氧化石墨烯纳米带支撑上的覆盖率来提高铱纳米粒子的析氧反应活性和稳定性

太阳能制氢目前被认为是化石燃料的最佳替代品。因此，需要开发能够实现高效和可持续能源转换和存储的材料。铱仍然是质子交换膜电解槽中唯一使用的材料，可有效催化析氢逆反应，即酸性介质中电化学水分解的析氧反应 (OER)。由于没有能够承受严酷反应条件的实用替代品，需要开发新方法来提高这种稀有金属的利用率。因此，研究了一种碳-陶瓷纳米复合材料，其中 Ir 纳米颗粒和氧氮化钛纳米片（TiON _x) 沉积在还原氧化石墨烯纳米带 (rGONRs) 的表面。OER 性能被证明取决于 Ir-TiON _x -rGONR 相的相互分布，在最好的情况下，其活性比商业 IrO ₂基准高出 30 倍。通过形成异质结来调整同一混合纳米复合材料中不同化学性质的域被证明可以提高 OER 性能。这项工作证明了微调碳陶瓷催化材料的形态、组成和颗粒分布如何对铱的 OER 活性和稳定性产生强烈的协同作用。

更新日期：2021-09-12

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