Ru Nanoparticles Encapsulated by Defective TiO₂ Boost the Hydrogen Oxidation/ Evolution Reaction.

IF 13 2区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Small Pub Date : 2024-10-10 DOI:10.1002/smll.202406387

Xiuting Fu, Xiaoxiao Huang, Yaping Cen, Xiaoyang Ren, Li Yan, Shao Jin, Zhongbin Zhuang, Wanlu Li, Shubo Tian

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Abstract

The development of efficient and durable electrocatalysts for the alkaline hydrogen oxidation/evolution reaction is crucial for anion exchange membrane fuel cells/water electrolyzers. However, designing such electrocatalysts poses a challenge due to the need for optimizing various adsorbates. Herein, highly dispersed Ru nanoparticles catalysts is reported encapsulated and supported by defective anatase phase of titanium dioxide (named as Ru NPs/def-TiO₂(A)) for boosting hydrogen-cycle electrocatalysis with robust anti-CO-poisoning in alkaline conditions. The Ru NPs/def-TiO₂(A) achieves a high-quality activity of 7.65 A mg_Ru ^-1, which is 23.2 and 9.5-fold higher than commercial Ru/C and Pt/C in alkaline HOR. Moreover, this catalyst exhibits an outstanding overpotential of 21 mV at 10 mA cm^-2 in alkaline HER. Hydrogen underpotential deposition (H_upd) and CO stripping experiments demonstrate that Ru NPs/def-TiO₂(A) has the optimized H*, OH*, and CO* adsorption strength, enabling the Ru NPs/def-TiO₂(A) catalyst to display excellent and robust HOR/HER performance under alkaline conditions. Using density functional theory calculations, the enhanced HOR performance mechanism for the Ru NPs/def-TiO₂(A) catalyst originates from the TiO₂ step face in contact with the Ru nanoparticles, indicating that the kinetics of water formation are considerably more favorable at the Ru NPs/def-TiO₂(A) interface.

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缺陷二氧化钛封装的 Ru 纳米粒子促进了氢氧化/进化反应。

为碱性氢氧化/进化反应开发高效耐用的电催化剂对于阴离子交换膜燃料电池/水电解槽至关重要。然而，由于需要优化各种吸附剂，设计此类电催化剂是一项挑战。本文报告了高度分散的 Ru 纳米粒子催化剂，该催化剂由二氧化钛的缺陷锐钛矿相封装和支撑（命名为 Ru NPs/def-TiO2(A)），用于促进氢循环电催化，并在碱性条件下具有强大的抗 CO 中毒能力。Ru NPs/def-TiO2(A)在碱性氢循环中达到了 7.65 A mgRu -1 的高质量活性，分别是商用 Ru/C 和 Pt/C 的 23.2 倍和 9.5 倍。此外，在碱性 HER 中，这种催化剂在 10 mA cm-2 时的过电位为 21 mV，表现出色。氢欠电位沉积（Hupd）和 CO 汽提实验证明，Ru NPs/def-TiO2(A) 具有优化的 H*、OH* 和 CO*吸附强度，使 Ru NPs/def-TiO2(A) 催化剂在碱性条件下表现出优异而稳定的 HOR/HER 性能。通过密度泛函理论计算，Ru NPs/def-TiO2(A) 催化剂的 HOR 性能增强机制源于与 Ru 纳米颗粒接触的 TiO2 阶跃面，这表明在 Ru NPs/def-TiO2(A) 界面上水的形成动力学更为有利。

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

Small 工程技术-材料科学：综合

CiteScore

17.70

自引率

3.80%

发文量

1830

审稿时长

2.1 months

期刊介绍： Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments. With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology. Small's readership includes biochemists, biologists, biomedical scientists, chemists, engineers, information technologists, materials scientists, physicists, and theoreticians alike.