Abstract
The design of the electrode with high-area and mass capacitance is important for the practical application of supercapacitors. Here, we fabricated the porous NiCoP nanowalls supported by Ni foam (NiCo-P/NF) for supercapacitors with win-win high-area and mass capacitance. The NiCoOH nanowall precursor was prepared by controlling the deposition rate of Ni2+ and Co2+ on NF through a sodium acetate-assisted (floride-free) process. After the phosphorization, the NiCo-P nanowalls formed with high loading about 8.6 mg cm-2 on NF. The electrode combined several advantages favorable for energy storage: the plentiful pores beneficial for ion transport, the nanowalls for easy accommodation of electrolyte, good conductivity of NiCo-P for easy transport of electrons. As expected, the NiCo-P/NF exhibited a high specific mass capacitance (1,861 F g-1 at 1 A g-1, 1,070 F g-1 at 10 A g-1), and high area capacitance (17.31 F cm-2 at 5 mA cm-2 and 10 F cm-2 at 100 mA cm-2). The asymmetric supercapacitor (ASC) composed of NiCo-P/NF positive electrode coupled with commercial active carbon negative electrode exhibited a high energy density of 44.9 W h kg-1 at a power density of 750 W kg-1. The ASC can easily drive fans, electronic watch and LED lamps, implying their potential for the practical application.
摘要
设计同时具有大面积和高质量电容的电极对于超级电容器 的实际应用非常重要. 本文, 我们将多孔NiCoP纳米围墙置于Ni泡 沫(NF)上得到(NiCo-P/NF)电极, 以该电极制备的超级电容器具有 高的面积电容和和质量电容. 首先通过NaAc辅助(不含氟)工艺控 制Ni2+和Co2+在NF上的沉积速率制备NiCoOH纳米围墙母体. 可控 磷化后, 在NF上形成具有约8.6 mg cm−2的高负载量的NiCo-P纳米 围墙. 该电极具有以下特点: 有利于离子传输的丰富孔隙; 易于容纳 电解质的纳米围墙; NiCo-P易于传输电子的良好导电性. NiCo-P/NF表现出高比质量电容(在1 A g−1时为1861 F g−1, 在10 A g−1时为 1070 F g−1), 并且具有大的面积电容(在5 mA cm−2 时为 17.31 F cm−2, 在100 mA cm−2时为10 F cm−2). 由NiCo-P/NF正极与 商业活性炭负极组成的非对称超级电容器(ASC)在功率密度为 750 W kg−1时表现出44.9 W h kg−1的高能量密度. ASC可以轻松驱 动风扇、电子表和LED灯, 表明其具有实际应用的潜力.
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Acknowledgements
We gratefully acknowledge the support from the National Natural Science Foundation of China (21571054, 21631004, 21805073 and 21771059), the Natural Science Foundation of Heilongjiang Province (QC2018013), and the basic research fund of Heilongjiang University in Heilongjiang Province (RCYJTD201801).
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Xiaomeng Zhang received her BSc and MSc degrees from Heilongjiang University in 2013 and 2016, respectively. She is currently a PhD candidate in inorganic chemistry under the supervision of Prof. Honggang Fu at Heilongjiang University. Her current research focuses on the design and synthesis of nanomaterials for energy storage.
Chungui Tian received his BSc degree in 1997 from Inner Mongolia University for Nationalities. In 2004 and 2007, he received his MSc and PhD degrees from Northeast Normal University under the guidance of Prof. Enbo Wang. Then, he joined Heilongjiang University as a lecturer. He became an assistant professor and a full professor in 2009 and 2014, respectively. His interest focuses on the designed synthesis and electrocatalytic application of W(Mo,V)-based nanomaterials. Up to now, he has published over 30 SCI papers as corresponding author with over 1,000 citations.
Honggang Fu received his BSc degree in 1984 and MSc degree in 1987 from Jilin University, China. Then, he joined Heilongjiang University as an assistant professor. In 1999, he received his PhD degree from Harbin Institute of Technology, China. He became a full professor in 2000. Currently, he is a Cheung Kong Scholar. His interest focuses on the oxide-based semiconductor nanomaterials for solar energy conversion and photocatalysis, carbon-based nanomaterials for energy conversion and storage, and W(Mo,V)-based catalysts for HER and OER. Up to now, he has published over 300 SCI papers as corresponding author with over 13,000 citations and H-index of 60.
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Zhang, X., Su, D., Wu, A. et al. Porous NiCoP nanowalls as promising electrode with high-area and mass capacitance for supercapacitors. Sci. China Mater. 62, 1115–1126 (2019). https://doi.org/10.1007/s40843-019-9405-8
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DOI: https://doi.org/10.1007/s40843-019-9405-8