Hollow Fluffy Co3O4 Cages as Efficient Electroactive Materials for Supercapacitors and Oxygen Evolution Reaction

ACS Applied Materials & Interfaces
Xuemei ZhouYongquan Qu

Abstract

Nano-/micrometer multiscale hierarchical structures not only provide large surface areas for surface redox reactions but also ensure efficient charge conductivity, which is of benefit for utilization in areas of electrochemical energy conversion and storage. Herein, hollow fluffy cages (HFC) of Co3O4, constructed of ultrathin nanosheets, were synthesized by the formation of Co(OH)2 hollow cages and subsequent calcination at 250 °C. The large surface area (245.5 m2 g(-1)) of HFC Co3O4 annealed at 250 °C ensures the efficient interaction between electrolytes and electroactive components and provides more active sites for the surface redox reactions. The hierarchical structures minimize amount of the grain boundaries and facilitate the charge transfer process. Thin thickness of nanosheets (2-3 nm) ensures the highly active sites for the surface redox reactions. As a consequence, HFC Co3O4 as the supercapacitor electrode exhibits a superior rate capability, shows an excellent cycliability of 10,000 cycles at 10 A g(-1), and delivers large specific capacitances of 948.9 and 536.8 F g(-1) at 1 and 40 A g(-1), respectively. Catalytic studies of HFC Co3O4 for oxygen evolution reaction display a much higher turnover frequency of 1.67×10...Continue Reading

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Citations

Aug 12, 2016·Scientific Reports·Thazhe Veettil VineeshTharangattu N Narayanan
Dec 15, 2016·ACS Applied Materials & Interfaces·Zixu TaoXingguo Li
Jan 25, 2017·ACS Applied Materials & Interfaces·Jing JiangLunhong Ai
Nov 16, 2018·Advanced Materials·Keke HuangShouhua Feng
Feb 27, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Malik Dilshad KhanNeerish Revaprasadu
Feb 28, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·P S GaikarRajaram S Mane
Jul 6, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Ming ChengRongming Wang
Oct 30, 2020·Nanoscale·Qicheng ZhangXiaobin Fan
Feb 26, 2021·Nanotechnology·Guojie ChengYi Liu
Feb 7, 2018·ACS Applied Materials & Interfaces·Renjie WeiJohnny C Ho

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