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Electrochemical Anion-Exchanged synthesis of porous Ni/Co hydroxide nanosheets for Ultrahigh-Capacitance supercapacitors
Hu, Qiang1; Chai, Yuru2; Zhou, Xinyi1; Ding, Shixiang1; Lin, Dunmin1; Jiang, Na1; Huo, Yu1; Zheng, Qiaoji1; Zhao, Jingxin4; Qu, Guoxing3
Source PublicationJournal of Colloid and Interface Science

The commonly reported calcination strategy usually requires high temperature to crack the metal–organic frameworks (MOFs) particles, which often lead to uncontrollable growth of nanomaterials. Here, for the first time, we utilize an electrochemical anion-exchanged method to control the hydrolysis of MOFs and synthesize porous Ni/Co hydroxide nanosheets. After the electrochemical anion-exchange, the organic ligands of MOFs nanosheets can be recycled and reused. Applying an electric field to the MOFs bulk in alkaline solution can accelerate the nucleation rate of hydroxide and change the migration behavior of charged ions/molecules, which can tailor the microstructure of derivatives and improve deep charge and discharge capability of the electrodes. As a result, the hydroxide with the optimized Ni:Co molar ratio of 7:3 and electric-field application time of 1000 cycles [NiCo(OH)-1000c] provides much better electrochemical properties than the materials synthesized without electric-field assistance: a high specific capacitance of 2115C g (4230F g). A hybrid supercapacitor with the NiCo(OH)-1000c electrode shows a high energy density of 74.7 Wh kg, an improved power density (5,990.6 W kg), and an excellent cyclic stability (8,000 cycles). This study not only provides a novel strategy for the preparation of low-cost, deep-discharge electrodes for supercapacitors, but also proposes an unconventional method for mild synthesizing MOFs materials into porous nanoscale derivatives with tailored micromorphology.

KeywordElectric-field Assistance Hierarchical Nanosheets Hybrid Supercapacitors Hydroxide Metal–organic Framework
URLView the original
Indexed BySCIE
WOS Research AreaChemistry
WOS SubjectChemistry, Physical
WOS IDWOS:000670310000001
Scopus ID2-s2.0-85106215634
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Cited Times [WOS]:2   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Corresponding AuthorZheng, Qiaoji; Zhao, Jingxin; Qu, Guoxing
Affiliation1.College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China
2.Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
3.School of Materials Science and Engineering, Nanchang University, Nanchang, 330031, China
4.Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, 999078, China
Recommended Citation
GB/T 7714
Hu, Qiang,Chai, Yuru,Zhou, Xinyi,et al. Electrochemical Anion-Exchanged synthesis of porous Ni/Co hydroxide nanosheets for Ultrahigh-Capacitance supercapacitors[J]. Journal of Colloid and Interface Science,2021,600:256-263.
APA Hu, Qiang,Chai, Yuru,Zhou, Xinyi,Ding, Shixiang,Lin, Dunmin,Jiang, Na,Huo, Yu,Zheng, Qiaoji,Zhao, Jingxin,&Qu, Guoxing.(2021).Electrochemical Anion-Exchanged synthesis of porous Ni/Co hydroxide nanosheets for Ultrahigh-Capacitance supercapacitors.Journal of Colloid and Interface Science,600,256-263.
MLA Hu, Qiang,et al."Electrochemical Anion-Exchanged synthesis of porous Ni/Co hydroxide nanosheets for Ultrahigh-Capacitance supercapacitors".Journal of Colloid and Interface Science 600(2021):256-263.
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