期刊
CHEMICAL ENGINEERING JOURNAL
卷 429, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.132184
关键词
Cations Concentration Variation; Chemical Bath Deposition; Hybrid Asymmetric Supercapacitor; Microflowers; Microsheets; Nickel cobalt phosphate
资金
- Ministry of Science and Technology India, Department of Science and Technology-Innovation in Science Pursuit for Inspired (DST-INSPIRE) [DST/INSPIRE/04/2016/000260]
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [2020R1A5A1019131]
- Science and Engineering Research Board (DST-SERB), New Delhi, India [CRG/2019/005730]
A rational combination of metal cations is necessary for improved electrochemical energy storage performance of bimetal compounds. Adjusting the ratio of nickel and cobalt can enhance the physicochemical properties and electrochemical capacitive performances of nickel cobalt phosphate materials. The synergy between nickel and cobalt species in the thin film electrodes contributes to the excellent electrochemical capacitive performance of hybrid asymmetric devices.
A rational combination of metal cations is necessary to obtain a synergistic effect leading to improved electrochemical energy storage performance of bimetal compounds. So, the effect of concentration variation of reactants (nickel and cobalt ratio) in nickel cobalt phosphate material and their influence on physicochemical properties and electrochemical capacitive performances are investigated. The morphological evolution from microflowers (nickel phosphate) to microsheets (cobalt phosphate) is observed with increasing cobalt content in nickel cobalt phosphate thin films. The optimum nickel and cobalt composition (similar to 1:1) in nickel cobalt phosphate (Ni1.38C- o(1.62)(PO4)(2).8H(2)O) thin film electrode demonstrate maximum specific capacitance (capacity) of 1116 F g(-1) (446 C g(-1)) at 0.5 A g(-1) current density. Also, a fabricated hybrid asymmetric aqueous device consists of nickel cobalt phosphate thin film as cathode and rGO as an anode in 1 M KOH electrolyte delivers a higher specific capacitance of 120 F g(-1) with a high energy density of 42.3 Wh kg- 1 at a power density of 1 kW kg(-1). Moreover, a hybrid asymmetric solid-state device fabricated using PVA-KOH gel electrolyte exhibits a maximum specific capacitance of 102 F g(-1) with an energy density of 36.2 Wh kg(-1) at 160 W kg(-1) power density and 83.7 % initial capacitance retention after 4000 GCD cycles. Such excellent electrochemical capacitive performance of hybrid asymmetric devices is attributed to the synergy between nickel and cobalt species in nickel cobalt phosphate thin film electrodes, suggesting its potential application as a cathode in hybrid energy storage devices.
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