Abstract
Rechargeable aqueous batteries with high power density and energy density are highly desired for electrochemical energy storage. Despite the recent reports of various cathode materials with ultrahigh pseudocapacitance exceeding 3000 F g−1 (or 800 mA h g−1), the development of anode materials is relatively insufficient, which limits the whole performance of the devices far from practical applications. Herein, we report the preparation of mesoporous Fe3O4@C nanoarrays as high-performance anode for rechargeable Ni/Fe battery by a self-generated sacrificial template method. ZnO/Fe3O4 composite was first synthesized by a co-deposition process, and ZnO was subsequently removed by alkali etching to construct the mesoporous structure. A thin carbon film was introduced onto the surface of the electrode by the carbonization of glucose to increase the structural stability of the electrode. The unique mesoporous nanoarray architecture endows the electrode with larger specific surface area, faster charge/mass transport and higher utilization of Fe3O4, which shows an ultrahigh specific capacity (292.4 mA h g−1 at a current density of 5 mA cm−2) and superior stability in aqueous electrolyte (capacitance retention of 90.8% after 5000 cycles). After assembled with hierarchical mesoporous NiO nanoarray as a cathode, an optimized rechargeable Ni/Fe battery with double mesoporous nanoarray electrodes was fabricated, which provided high energy/power densities (213.3 W h kg−1 at 0.658 kW kg−1 and 20.7 kW kg−1 at 113.9 W h kg−1, based on the total mass of the active materials) in the potential window of 1.5 V with excellent cyclability (81.7% retention after 5000 charge/discharge cycles).
摘要
阴极材料的开发对于可充电水相电池的发展具有重要意义. 本 文通过自牺牲模板法和碳包覆法相结合制备了碳包覆介孔Fe3O4纳米 阵列阴极材料(Fe3O4@C MNAs). 得益于包覆碳层、介孔结构和纳米 阵列结构的优异特性, Fe3O4@C MNAs电极表现出良好的倍率性能和 优秀的循环稳定性. 在组装的Ni/Fe电池器件中, Fe3O4@C MNAs表现 出较高的能量密度及功率密度(在能量密度为213.3 W h kg−1时功率 密度为0.658 kW kg−1和在功率密度为20.7 kW kg−1时能量密度为 113.9 W h kg−1)和出色的循环稳定性(约5000次循环后保持81.7%).
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Acknowledgements
This work was financially supported by the National Key Research and Development Program of China (2018YFA0702000), the National Natural Science Foundation of China (NSFC), Beijing Natural Science Foundation (2204089), and the Fundamental Research Funds for the Central Universities.
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Meng G, Han A and Liu J designed the project; Zhang T, Yang C, Sun S and Huang Y conducted the experiments. Zhang T and Yang C wrote the paper with support from Meng G, Han A and Liu J. All authors contributed to the general discussion.
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The authors declare that they have no conflict of interest.
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Supplementary data are available in the online version of the paper.
Tianyu Zhang received his BSc degree from Nankai University in 2013. Currently, he is a PhD student in the group of Prof. Junfeng Liu at Beijing University of Chemical Technology (BUCT). His research interests are related to supercapacitors and electrocatalysts.
Can Yang received her BSc degree from Beijing Jiaotong University in 2017. Currently, she is a graduate student in the group of Prof. Junfeng Liu at BUCT. Her research interests are related to supercapacitors and electrocatalysts.
Ge Meng received his BSc degree from Qingdao University in 2012. He received his Master and Doctoral degrees in the group of Prof. Junfeng Liu at BUCT in 2015 and 2018, respectively. Currently, he is a postdoctor at Tsinghua University. His research interests are related to supercapacitors, electrochemical and heterogeneous catalysis.
Aijuan Han received her BS degree and PhD in chemistry from Shandong University in 2010 and the National University of Singapore in 2015, respectively. After postdoctoral work at Tsinghua University, she joined the College of Chemistry, BUCT, in 2018 as an Associate Professor. Her main research interests focus on the synthesis and characterization of singe-atom catalysts, as well as their applications in electrocatalysis, photocatalysis, and heterogeneous catalysis.
Junfeng Liu received her BS degree and PhD in chemistry from Tsinghua University in 2002 and 2007, respectively. She joined the State Key Laboratory of Chemical Resource Engineering, BUCT, in 2008. Her main research interests focus on functional inorganic materials and their applications in catalysis and energy field.
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Zhang, T., Yang, C., Sun, S. et al. Mesoporous Fe3O4@C nanoarrays as high-performance anode for rechargeable Ni/Fe battery. Sci. China Mater. 64, 1105–1113 (2021). https://doi.org/10.1007/s40843-020-1510-4
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DOI: https://doi.org/10.1007/s40843-020-1510-4