Abstract
Heterostructure engineering holds exceptional promise for the development of high-performance electrocatalysts for overall water splitting. However, production of inexpensive and high-efficiency bifunctional electrocatalysts remains a challenge. Herein, we demonstrate a simple method to synthesize a paper-mulberry (Broussonetia papyrifera)-in-spired Co9S8@CoNi2S4/nickel foam (Co9S8@CoNi2S4/NF) heterojunction with high catalytic activity and stability. The process involves in situ growth of NiCo layered double hydroxide and in situ derivatization of ZIF-67, followed by the S heteroatom doping. The Co9S8@CoNi2S4/NF benefits from the heterostructure and functional advantages of multidimensional building blocks including one-dimensional (1D) nanowires, 2D nanosheets and nanoparticles. The optimized Co9S8@CoNi2S4/NF heterojunction with 10% sulphur content reveals excellent electrocatalytic activity with the lower over-potentials of 68 mV for hydrogen evolution reaction (HER) and 170 mV for oxygen evolution reaction (OER) at 10 mA cm−2 in the 1.0 mol L−1 KOH solution, which is superior to the recently reported transition metal based electrocatalysts. The outstanding performance is attributed to the strong interface coupling between CoNi2S4 and Co9S8, the advantage of multidimensional structure and the customized electronic structure. The density functional theory suggests that the interface between Co9S8 and CoNi2S4 optimizes the adsorption of the multiple intermediates and further facilitates water splitting kinetics. This work offers a generic approach for heterostructure engineering design of high-performance catalytic system applications.
摘要
异质结构工程在高效全解水催化剂方面具有突出的应用前景. 然而, 生产廉价高效的双功能电催化剂仍然是一个巨大的挑战. 因此, 我们受构树启发, 通过一种简单的方法在泡沫镍基体上合成了高催化 活性和稳定性的Co9S8@CoNi2S4/NF异质结. 该过程包括NiCo层状双氢 氧化物在泡沫镍基体上的原位生长和原位衍生ZIF-67, 并伴随S原子掺 杂. 所获得的Co9S8@CoNi2S4/NF多维度异质结包括一维纳米线、二维 纳米片和纳米颗粒. 优化的Co9S8@CoNi2S4/NF中硫含量为10%, 在 1.0 mol L−1KOH溶液中, 电流密度为10 mA cm−2时, 具有优异的电催化 活性, 其析氢和析氧过电位分别为68和170 mV, 优于最近报道的过渡金 属基电催化剂. 该催化剂优异的催化性能主要归因于CoNi2S4与Co9S8之 间较强的界面耦合、多维结构以及定制电子结构优势. 密度泛函理论 表明, Co9S8和CoNi2S4之间的界面优化了多个中间体的吸附, 进一步促 进了水裂解动力学. 本工作为高效异质结构工程催化体系的设计提供 了一种通用的方法.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (22005273, 21825106, and 21671175) and the Program for Science & Technology Innovative Research Team in the University of Henan Province (20IRTSTHN007). Ostrikov K thanks the Australian Research Council and QUT Centre for Materials Science for partial support.
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Chen W designed and engineered the samples; Chen W analyzed the data and wrote the paper with the support from Zang SQ; Hu Y conducted the theoretical simulation; Cui J and Wang J performed the experiments; Ostrikov K and Peng P helped to revise and polish the paper; Wei W and Zhang Y helped to conduct some characterizations. All authors contributed to the general discussion.
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Supporting data are available in the online version of the paper.
Shuang-Quan Zang received his PhD degree in chemistry from Nanjing University in 2006 under the supervision of Prof. Qingjin Meng. After postdoctoral research with Prof. Thomas C. W. Mak at The Chinese University of Hong Kong, he joined the College of Chemistry, Zhengzhou University. He received the National Science Fund for Distinguished Young Scholars in 2018. He is serving as the Dean of the College of Chemistry and Green Catalysis Center, Zhengzhou University. His current scientific interests focus on atomically-precise metal clusters, cluster-assembled materials, and functional metal-organic frameworks.
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Chen, W., Hu, Y., Peng, P. et al. Multidimensional Ni-Co-sulfide heterojunction electrocatalyst for highly efficient overall water splitting. Sci. China Mater. 65, 2421–2432 (2022). https://doi.org/10.1007/s40843-021-1994-8
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DOI: https://doi.org/10.1007/s40843-021-1994-8