Direct growth of honeycomb-like NiCo2O4@Ni foam electrode for pouch-type high-performance asymmetric supercapacitor
Direct growth of honeycomb-like NiCo2O4@Ni foam electrode for pouch-type high-performance asymmetric supercapacitor
复制标题
DOI：
10.1016/j.jallcom.2020.155370
复制
发表时间：
2020-09-25
影响因子：
6.2
通讯作者：
Shim, Jae-Jin
中科院分区：
文献类型：
--
作者：
Kumar, Deivasigamani Ranjith;Prakasha, K. R.;Shim, Jae-Jin
本研究重点是通过简单的燃烧方法在泡沫镍上无粘合剂直接生长蜂窝状 NiCo2O4 结构及其作为超级电容器电极的应用。以甘氨酸为燃料，硝酸盐为氧化剂，采用适当的甘氨酸与镍/硝酸钴摩尔比形成蜂窝状NiCo2O4@Ni泡沫（NF）。使用不同浓度的甘氨酸和硝酸镍/钴优化了 NF 上 NiCo2O4 的质量负载。蜂窝状NiCo2O4@NF电极在1 A g(-1)电流密度下表现出646.6 F g(-1)的高比电容，在9 A g(-1)电流密度下表现出32%电容保持率的相当倍率性能。此外，使用 6 M KOH 制备了以 NiCo2O4@NF 作为阴极、糖衍生碳 (SC) 作为阳极的双电极袋型不对称超级电容器 (NiCo2O4@NF//SC)。 NiCo2O4@NF//SC电极在1.5 A g(-1)电流密度下表现出较高的电荷存储容量，比电容为169 F g(-1)。更重要的是，该非对称超级电容器在功率密度为1076 W kg(-1)时表现出48 W h kg(-1)的高能量密度，并且具有出色的循环稳定性，3000次循环后电容保持率为96.5%。这些结果表明这种蜂窝结构的 NiCo2O4@NF 材料可能成为超级电容器的有前途的阴极电极。 (C) 2020 Elsevier B.V. 保留所有权利。
This study focuses on the binder-free direct growth of a honeycomb-like NiCo2O4 structure on Ni foam by a simple combustion method and its application as a supercapacitor electrode. With glycine as a fuel and nitrate as an oxidizer, an appropriate glycine-to-nickel/cobalt-nitrate molar ratio was used for the formation of the honeycomb-like NiCo2O4@Ni foam (NF). The mass loading of NiCo2O4 on NF was optimized using different concentrations of glycine and nickel/cobalt nitrate. The honeycomb-like NiCo2O4@NF electrode exhibited a high specific capacitance of 646.6 F g(-1) at a current density of 1 A g(-1) and a comparable rate performance of 32% capacitance retention at 9 A g(-1). Furthermore, two-electrode pouch-type asymmetric supercapacitors with NiCo2O4@NF as the cathode and sugar-derived carbon (SC) as the anode were fabricated (NiCo2O4@NF//SC) using 6 M KOH. The NiCo2O4@NF//SC electrode exhibited a high charge storage capacity with a specific capacitance of 169 F g(-1) at a current density of 1.5 A g(-1). More importantly, the asymmetric supercapacitor exhibited a high energy density of 48 W h kg(-1) at a power density of 1076 W kg(-1) and outstanding cycling stability with 96.5% capacitance retention after 3000 cycles. These results suggest that this honeycomb-structured NiCo2O4@NF material could be a promising cathode electrode for supercapacitors. (C) 2020 Elsevier B.V. All rights reserved.