Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 586, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2019.124232
Keywords
Co3O4/RGO hybrid materials; Phosphate ion functionalization; Mesopore structure; Electrochemical properties
Categories
Funding
- National Natural Science Foundation of China [21471093, 51772182]
- 111 Project
- Fundamental Research Funds for the Central Universities [GK201801010]
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By using surfactants P123 as directional growth agent of Co(OH)(2) nanosheets, Co3O4 nanosheet/reduced graphite oxide (RGO) hybrid material was prepared by calcining precursor Co(OH)(2)/graphite oxide (GO) at 275 degrees C for 2 h and followed by thermal annealing at 500 degrees C for 1.5 h in Ar atmosphere. With a mass ratio of Co3O4/RGO to NaH2PO2 center dot H2O being 10, phosphate-ion functionalized Co3O4 nanosheets/RGO (denoted as P-Co3O4/RGO-10) was finally prepared by phosphating treating Co3O4/RGO at 225 degrees C for 30 min. The phase transition from Co (OH)(2) nanosheets to Co3O4 nanosheets was a topochemical process and Co3O4 nanosheets with porous characteristic were uniformly dispersed on the surface of RGO. Phosphating treatment not only improved the surface reaction activity of Co3O4 nanosheets and rate performance of the obtained electrode materials, but also caused thin nanosheet pores favorable to the transport of electrolyte ions. P-Co3O4/RGO-10 hybrid electrode showed improved specific capacitance (448 F g(-1)) at a current density of 1 A g(-1), extremely outstanding rate capability (78 %) at various current densities from 1 to 10 A g(-1) and good cycling performance after continuous 5000 cycles. Phosphating treatment technology is an effective surface engineering technology to improve rate capability and specific capacitance for pseudocapacitive materials.
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