Strontium doping RuO2 electrocatalyst with abundant oxygen vacancies for boosting OER performance

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Applied Nano Materials Pub Date : 2024-11-02 DOI:10.1039/d4qi02070g

Bei An, Xiaoqian Li, Yuan Lin, Fanfan Shang, Huijie He, Hairui Cai, Xiaoxiao Zeng, Weitong Wang, Shengchun Yang, Bin Wang

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引用次数: 0

Abstract

Oxygen evolution reaction (OER) plays a crucial role as the anode reaction of electrolytic water in various applications. To date, it is still a great challenge to develop highly active and durable electrocatalysts for acidic electrolytic water. Herein, we highlight an effective strategy to regulate the oxidation state of Ru species and oxygen vacancies in RuO2 by introducing Sr heteroatom into its lattice based on the principle of charge equilibrium. The as-prepared Sr0.1RuOx exhibits excellent OER activity with an overpotential of 201 mV at the current density of 10 mA cm-2, which should be ascribed to the higher proportion of Ru4+ induced by Sr doping. Moreover, both experimental and theoretical calculations revealed that the introduced oxygen vacancies inhabited Ru to be overoxidized to Run>4+ during the OER process, thus enhancing the stability of Sr0.1RuOx. Therefore, the PEM electrolyzer by using Sr0.1RuOx as the anode catalyst can be operated for 240 hours at 10 mA cm-2 without obvious attenuation. This work presented an effective strategy to regulate the structure of the OER electrocatalysts with excellent performance.

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具有丰富氧空位的锶掺杂 RuO2 电催化剂可提高 OER 性能

氧进化反应（OER）作为电解水的阳极反应，在各种应用中发挥着至关重要的作用。迄今为止，为酸性电解水开发高活性、高持久性的电催化剂仍是一项巨大挑战。在此，我们着重介绍一种有效的策略，即根据电荷平衡原理，通过在 RuO2 晶格中引入 Sr 杂原子来调节 RuO2 中 Ru 物种和氧空位的氧化态。制备出的 Sr0.1RuOx 具有优异的 OER 活性，在电流密度为 10 mA cm-2 时过电位为 201 mV，这应该归因于 Sr 掺杂导致 Ru4+ 的比例升高。此外，实验和理论计算均表明，在 OER 过程中，引入的氧空位使 Ru 过度氧化为 Run>4+，从而提高了 Sr0.1RuOx 的稳定性。因此，使用 Sr0.1RuOx 作为阳极催化剂的 PEM 电解槽可在 10 mA cm-2 的条件下运行 240 小时而无明显衰减。这项研究提出了一种调节 OER 电催化剂结构的有效策略，并取得了优异的性能。

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

ACS Applied Nano Materials Multiple-

CiteScore

8.30

自引率

3.40%

发文量

1601

期刊介绍： ACS Applied Nano Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics and biology relevant to applications of nanomaterials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important applications of nanomaterials.