Fabrication of MOF-derived mixed metal oxides with carbon residues for pseudocapacitors with long cycle life

• 作者: Yuan-Fu Ren Zhi-Liang He Hao-Zhen Zhao Ting Zhu
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2022,（3）
• 所属期刊栏目: LETTERS
• 页码范围: 830-835
• 页数: 6页
• 语种: 英文

摘要

High electroactivity and good mechanical robustness of electrode materials are essential to deliver excellent elec-trochemical energy storage performance.Herein,metal-organic frameworks(MOF)derived mixed metal oxides(MMO,ZnO@NiO and Co3O4@NiO)are prepared by a two-step annealing process in air.Zinc-based MOF(ZIF-8)and cobalt-based MOF(ZIF-67)were employed,respec-tively,as hard templates for the chemical encapsulation of Ni(OH)2 nanostructures by hydrothermal synthesis.The as-prepared ZIF-8@Ni(OH)2 and ZIF-67@Ni(OH)2 were then converted to corresponding MMO through annealing in air.Meanwhile,MOF-derived carbon was preserved in the as-fabricated MMO structure,thus improving the electronic conductivity as well as the mechanical stability of the materials.In virtue of these features,high specific capaci-tance of 1017 and 744 F·g-1 can be delivered at a current density of 1 A.g-1 for the Co3O4@NiO and ZnO@NiO samples,respectively.In addition,both of the samples have shown excellent cycling performance,which exhibited excellent capacitance retentions of 90.1％and 93.0％after 10,000 cycles for the Co3O4@NiO and ZnO@NiO sam-ples,respectively,demonstrating their very promising use in next-generation pseudocapacitors.