Heterostructure and atomic doping engineering in 3D Co2CrO4@Cr-NiFe LDH/CF nanosheet arrays for efficient electrocatalytic oxygen evolution

IF 3.5 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Dalton Transactions Pub Date : 2025-04-14 DOI:10.1039/d5dt00351b

Xinyue Yao, Qiangqiang Wang, Xuejing Liu, Xuan Kuang, Xu Sun, Xiang Ren, Dan Wu, Qin Wei

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Abstract

The oxygen evolution reaction (OER) is usually considered a major obstacle to electrochemical water splitting, primarily because of its sluggish kinetics. Developing an effective and durable catalyst for the OER is indispensable for overcoming this challenge. In this study, a three-dimensional nanomaterial with a unique heterostructure (Co₂CrO₄@Cr-NiFe LDH/CF) was obtained by the deposition of Cr-doped double hydroxide (Cr-NiFe LDH) on Co₂CrO₄ nanosheet arrays grown on copper foam (Co₂CrO₄/CF). In particular, the catalyst had a current density of 100 mA cm⁻² at a low overpotential of just 257 mV, a high turnover frequency (TOF) of 10.21 s⁻¹ at an overpotential of 300 mV and a Tafel slope of merely 72 mV dec⁻¹. This indicated that Co₂CrO₄@Cr-NiFe LDH/CF exhibited outstanding catalytic efficiency. Moreover, the catalyst exhibited stability for a duration of 40 h at a current density of 100 mA cm⁻². The study introduces an innovative approach for the superior design of an OER catalyst and offers a significant reference for investigation within the realm of renewable energy.

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三维Co2CrO4@Cr-NiFe LDH/CF纳米片阵列的异质结构和原子掺杂工程用于高效电催化析氧

析氧反应（OER）通常被认为是电化学水分解的主要障碍，主要是因为它的动力学缓慢。为OER开发一种有效和持久的催化剂对于克服这一挑战是必不可少的。在本研究中，通过在泡沫铜（Co2CrO4/CF）上生长的Co2CrO4纳米片阵列上沉积掺杂cr的双氢氧化物（Cr-NiFe LDH），获得了具有独特异质结构的三维纳米材料（Co2CrO4@Cr-NiFe LDH/CF）。尤其值得注意的是，该催化剂在过电位257 mV时电流密度为100 mA cm−2，过电位300 mV时转换频率（TOF）高达10.21 s−1，Tafel斜率仅为72 mV dec−1。这表明Co2CrO4@Cr-NiFe LDH/CF具有出色的催化效率。此外，该催化剂在100 mA cm−2的电流密度下表现出40小时的稳定性。该研究为OER催化剂的优化设计提供了一种创新的方法，为可再生能源领域的研究提供了重要的参考。

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来源期刊

Dalton Transactions 化学-无机化学与核化学

CiteScore

6.60

自引率

7.50%

发文量

1832

审稿时长

1.5 months

期刊介绍： Dalton Transactions is a journal for all areas of inorganic chemistry, which encompasses the organometallic, bioinorganic and materials chemistry of the elements, with applications including synthesis, catalysis, energy conversion/storage, electrical devices and medicine. Dalton Transactions welcomes high-quality, original submissions in all of these areas and more, where the advancement of knowledge in inorganic chemistry is significant.