Ultrafast Synthesis of IrB1.15 Nanocrystals for Efficient Chlorine and Hydrogen Evolution Reactions in Saline Water

IF 16.1 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Dr. Tingting Liu, Dr. Zhangsen Chen, Sixiang Liu, Dr. Pan Wang, Prof. Zonghua Pu, Prof. Gaixia Zhang, Shuhui Sun
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Abstract

The production of storable hydrogen fuel through water electrolysis powered by renewable energy sources such as solar, marine, geothermal, and wind energy presents a promising pathway toward achieving energy sustainability. Nevertheless, state-of-the-art electrolysis requires support from ancillary processes which often incur financial and energy costs. Developing electrolysers capable of directly operating with water that contains impurities can circumvent these processes. Herein, we demonstrate the efficient and durable electrolysis of saline water to produce chlorine gas (Cl2) and hydrogen using structurally ordered IrB1.15, synthesized through ultrafast joule heating. IrB1.15 exhibits remarkable performance, achieving overpotentials of 75 mV for the chlorine evolution reaction (CER) and 12 mV for hydrogen evolution reactions (HER) at current densities of 10 mA cm−2. Moreover, IrB1.15 displays a durability of over 90 h towards both CER and HER. Density functional theory reveals that IrB1.15 has adsorption energies significantly closer to 0 eV for Cl and H, compared to IrO2 and Pt/C. Furthermore, in situ Raman investigations reveal that Ir in IrB1.15 serves as the active center for CER, while the introduction of B atoms to Ir lattices mitigates the formation of absorbed hydrogen species on the Ir surface, thereby enhancing the performance of IrB1.15 in HER.

Abstract Image

IrB1.15纳米晶体在盐水中高效析氯和析氢反应的超快合成
利用太阳能、海洋、地热和风能等可再生能源,通过水电解生产可储存的氢燃料,是实现能源可持续性的一条有希望的途径。然而,最先进的电解技术需要辅助工艺的支持,这些辅助工艺往往会产生财政和能源成本。开发能够直接处理含有杂质的水的电解槽可以绕过这些过程。在这里,我们展示了高效和持久的电解盐水产生氯气(Cl2)和氢,使用结构有序的IrB1.15,通过超快焦耳加热合成。IrB1.15表现出优异的性能,在电流密度为10 mA cm−2时,析氯反应(CER)的过电位为75 mV,析氢反应(HER)的过电位为12 mV。此外,IrB1.15对CER和HER的持久性均超过90 h。密度泛函理论表明,与IrO2和Pt/C相比,IrB1.15对Cl和H的吸附能明显接近于0 eV。此外,原位拉曼研究表明,IrB1.15中的Ir充当了CER的活性中心,而在Ir晶格中引入B原子减轻了Ir表面吸收氢的形成,从而提高了IrB1.15在HER中的性能。
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来源期刊
CiteScore
26.60
自引率
6.60%
发文量
3549
审稿时长
1.5 months
期刊介绍: Angewandte Chemie, a journal of the German Chemical Society (GDCh), maintains a leading position among scholarly journals in general chemistry with an impressive Impact Factor of 16.6 (2022 Journal Citation Reports, Clarivate, 2023). Published weekly in a reader-friendly format, it features new articles almost every day. Established in 1887, Angewandte Chemie is a prominent chemistry journal, offering a dynamic blend of Review-type articles, Highlights, Communications, and Research Articles on a weekly basis, making it unique in the field.
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