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NiMoCo layered double hydroxides for electrocatalyst and supercapacitor electrode

基于NiMoCo层状双金属氢氧化物的电催化剂和 超级电容器电极

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Abstract

Non-noble-metal electrode materials with high durability and efficiency have become the frontiers of energy conversion and storage fields. However, conventional electrode materials often show high overpotential and low conductivity. To solve this problem, we fabricate a NiMoxCo2−x layered double hydroxide (LDH)/Ni foam (NF) product through a facile hydrothermal route. The as-prepared NiMo-Co-LDH/NF catalyst possesses an overpotential of 123 mV for hydrogen evolution reaction (HER) at 10 mA cm−2 and 279 mV for oxygen evolution reaction (OER) at 20 mA cm−2. The as obtained product exhibits excellent overall water splitting performances. Meanwhile, as the electrode material for supercapacitor, it delivers high specific capacitance and excellent cyclic performance. The asymmetric supercapacitor assembled with NiMoCo-LDH/NF//active carbon exhibits 93% of its initial capacity after 8000 cycles.

摘要

本文通过调控Ni, Mo, Co三种元素的摩尔比得到一系列高效 双功能电催化剂. 其中, Co元素特定的氧吸附位点(Co2+-O-Co3+)可 有效提高催化剂的活性. Mo元素在温和反应条件下具有较好的氧 化还原能力. Ni是另一种高活性过渡金属. 与其他材料结合可有效 增强催化剂的氧化还原活性和储氧能力. 所制备的NiMoCo层状双 金属氢氧化物(NiMoCo-LDH)催化剂在10 mA cm−2时析氢反应 (HER)过电势为123 mV, 20 mA cm−2时析氧反应(OER)过电势为 251 mV. 该材料还表现出优异的全解水性能, 为构筑过渡金属氢氧 化物电催化剂提供了崭新思路. 同时, 所制备的电极材料用作超级 电容器正极时也表现出优异的性能. 在1 A g−1的电流密度下, NiMoCo-LDH电极拥有642.1 C g−1的比容量. 组装的NiMoCo-LDH//AC非对称超级电容器在功率密度为2695 W kg−1时能量密度 为141 W h kg−1, 经过8000次充放电后仍保持初始容量的93%.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870, China

    Hengqi Liu  (刘恒岐), Depeng Zhao  (赵德鹏), Ying Liu  (刘颖), Yongli Tong  (佟永丽) & Xiang Wu  (武祥)

  2. State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China

    Guozhen Shen  (沈国震)

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  1. Hengqi Liu  (刘恒岐)
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  2. Depeng Zhao  (赵德鹏)
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  3. Ying Liu  (刘颖)
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  4. Yongli Tong  (佟永丽)
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  5. Xiang Wu  (武祥)
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  6. Guozhen Shen  (沈国震)
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Contributions

Liu H and Zhao D did the experiments and wrote the original draft. Liu Y contributed to visualization and investigation. Tong Y helped with software and validation. Wu X supervised, reviewed and edited the manuscript. Shen G supervised the study and gave some advice.

Corresponding authors

Correspondence to Xiang Wu  (武祥) or Guozhen Shen  (沈国震).

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Conflict of interest

The authors declare that they have no conflict of interest.

Acknowledgements

This work was supported by Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology (191010-K), the Education Department Funding of Liaoning Province (LJGD2019001), and the Funding of Science and Technology Bureau, Shenyang City (RC190138).

Hengqi Liu received his BS degree in materials science and engineering from Liaoning University of Technology, China, in 2017. One year later, he joined Prof. Xiang Wu’s group at Shenyang University of Technology, China, for pursuing his MSc degree in materials engineering. His research interest focuses on electrochemical capacitor and electrocatalysts.

Xiang Wu received his PhD degree in materials science and engineering from Harbin Institute of Technology in 2008. After that he joined Harbin Normal University and stayed there until September 2016. He ever worked as a visiting scientist in the National Institute for Materials Science (NIMS), Japan, and Taiwan University. He is now a full professor of materials science at Shenyang University of Technology, China. His research interests focus on the syntheses and characterization of semiconductor nanomaterials and their applications in environment and energy fields.

Guozhen Shen received his BSc degree (1999) in chemistry from Anhui Normal University and PhD degree (2003) in chemistry from the University of Science and Technology of China. He joined the Institute of Semiconductors, Chinese Academy of Sciences as a professor in 2013. His current research focuses on flexible electronics and printable electronics, including transistors, photodetectors, sensors and flexible energy storage and conversion devices.

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Liu, H., Zhao, D., Liu, Y. et al. NiMoCo layered double hydroxides for electrocatalyst and supercapacitor electrode. Sci. China Mater. 64, 581–591 (2021). https://doi.org/10.1007/s40843-020-1442-3

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