Dynamic structural transformation induced by defects in nano-rod FeOOH during electrochemical water splitting†

IF 10.7 2区 材料科学 Q1 CHEMISTRY, PHYSICAL
Yitian Hu, Jing Zhou, Lili Li, Zhiwei Hu, Taotao Yuan, Chao Jing, Renduo Liu, Shibo Xi, Haiqing Jiang, Jian-Qiang Wang and Linjuan Zhang
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引用次数: 9

Abstract

Defect engineering is a prevailing strategy for enhancing the oxygen evolution reaction activity for water spitting of electrocatalysts with a single phase or single metal; however, the exact role of defects in the improvement of catalytic activity remains unclear. Although Fe-based catalysts, such as unary FeOOH compounds, suffer from insufficient activity, they are promising catalysts due to their low cost, rich redox properties and low toxicity. In this work, a unique defect-rich nanorod FeOOH catalyst (D-FeOOH) is rationally constructed by simple electron beam irradiation, which enhances the mass activity by 8 times compared with that for pristine FeOOH and achieves the highest rank among unary Fe catalysts reported to date. In situ Raman and hard X-ray absorption spectroscopic studies reveal that defects during the OER activation process can speed up the dynamic reconstruction from single β-FeOOH to a mixed α/β-FeOOH phase and modulate the ultimate atomic ratio of the mixed phase, which enhances the electrochemical performance. This work provides insight into the defect mechanism in FeOOH by accelerating the dynamic structural evolution during the OER process.

Abstract Image

电化学水分解过程中纳米棒FeOOH缺陷诱导的动态结构转变
缺陷工程是提高单相或单金属电催化剂吐水析氧反应活性的常用策略;然而,缺陷在提高催化活性中的确切作用尚不清楚。虽然铁基催化剂,如一元FeOOH化合物的活性不足,但由于其低成本、丰富的氧化还原性能和低毒性,它们是很有前途的催化剂。本研究通过简单的电子束辐照,合理构建了一种独特的富缺陷纳米棒FeOOH催化剂(D-FeOOH),其质量活性比原始FeOOH提高了8倍,在迄今报道的单一Fe催化剂中排名最高。原位拉曼和硬x射线吸收光谱研究表明,OER活化过程中的缺陷可以加速从单一β-FeOOH到混合α/β-FeOOH的动态重建,并调节混合相的最终原子比,从而提高电化学性能。本研究通过加速OER过程中结构的动态演化,对FeOOH的缺陷机理进行了深入的研究。
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
Journal of Materials Chemistry A
Journal of Materials Chemistry A CHEMISTRY, PHYSICAL-ENERGY & FUELS
CiteScore
19.50
自引率
5.00%
发文量
1892
审稿时长
1.5 months
期刊介绍: The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.
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