用于高效混合超级电容器的插层有零维多金属氧酸盐的镍 - 铬层状双氢氧化物逐层纳米杂化物。

Layer-by-layer nanohybrids of Ni-Cr-LDH intercalated with 0D polyoxotungstate for highly efficient hybrid supercapacitor.

作者信息

Padalkar Navnath S, Sadavar Shrikant V, Shinde Rohini B, Patil Akash S, Patil Umakant M, Dhawale Dattatray S, Bulakhe Ravindra N, Kim Hyungsang, Im Hyunsik, Vinu Ajayan, Lokhande Chandrakant D, Gunjakar Jayavant L

机构信息

Centre for Interdisciplinary Research, D. Y. Patil Education Society, Deemed to be University, Kolhapur 416 006, India.

Department of Polymer Science and Engineering, Department of IT-energy convergence (BK21 FOUR), Korea National University of Transportation, Chungju 380-702, South Korea.

出版信息

J Colloid Interface Sci. 2022 Jun 15;616:548-559. doi: 10.1016/j.jcis.2022.02.091. Epub 2022 Feb 21.

DOI:10.1016/j.jcis.2022.02.091

PMID:35228050

Abstract

The layer-by-layer mesoporous nanohybrids of Ni-Cr-layered double hydroxide (Ni-Cr-LDH) and polyoxotungstate nanoclusters (Ni-Cr-LDH-POW) are prepared via exfoliation reassembling strategy. The intercalative hybridization of Ni-Cr-LDH with POW nanoclusters leads to forming a layer-by-layer stacking framework with significant expansion of the interplanar spacing and surface area. The aqueous hybrid supercapacitor (AHSC) and all-solid-state hybrid supercapacitor (SSHSC) devices are fabricated using Ni-Cr-LDH-POW nanohybrid as a cathode and reduced graphene oxide (rGO) as an anode material. Notably, the NCW-2//rGO AHSC device delivers an ED of 43 Wh kg at PD of 1.33 kW kg and excellent electrochemical stability over 10,000 charge-discharge cycles. Moreover, NCW-2//rGO SSHSC exhibits an ED of 34 Wh kg at PD of 1.32 kW kg with capacitance retention of 86% after 10,000 cycles. These results highlight the excellent electrochemical functionality and advantages of the Ni-Cr-LDH-POW nanohybrids as a cathode for hybrid supercapacitors.

摘要

通过剥离-重组策略制备了镍-铬层状双氢氧化物（Ni-Cr-LDH）和多金属氧酸盐纳米团簇的逐层介孔纳米杂化物（Ni-Cr-LDH-POW）。Ni-Cr-LDH与POW纳米团簇的插层杂交导致形成具有显著层间距和表面积扩展的逐层堆叠框架。以Ni-Cr-LDH-POW纳米杂化物为阴极、还原氧化石墨烯（rGO）为阳极材料制备了水系混合超级电容器（AHSC）和全固态混合超级电容器（SSHSC）器件。值得注意的是，NCW-2//rGO AHSC器件在功率密度为1.33 kW kg时能量密度为43 Wh kg，并且在10000次充放电循环中具有优异的电化学稳定性。此外，NCW-2//rGO SSHSC在功率密度为1.32 kW kg时能量密度为34 Wh kg，在10000次循环后电容保持率为86%。这些结果突出了Ni-Cr-LDH-POW纳米杂化物作为混合超级电容器阴极的优异电化学功能和优势。