Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 50, Pages 34455-34463Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b12672
Keywords
gel electrolyte; vanadium oxide hydrates; electrochemistry; cyclic stability; hybrid supercapacitors
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT, and Future Planning [NRF-2016R1A2A2A05005327]
- Technology Innovation Program - Ministry of Trade, Industry & Energy (MI, Korea) [10047681]
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Gel electrolytes are considered to be promising candidates for the use in supercapacitors. It is worthy to systematically evaluate the internal electrochemical mechanisms with a variety of cations (poly(vinyl alcohol) (PVA)based Li+, Na+, and K+) toward redox-type electrode. Herein, we describe a quasi-solid-state PVA-KCl gel electrolyte for V2O5 center dot 0.5H(2)O-based redox-type capacitors, effectively avoiding electrochemical oxidation and structural breakdown of layered V2O5 center dot 0.5H(2)O during 10 000 charge-discharge cycles (98% capacitance retention at 400 mV s(-1)). With the gel electrolyte, symmetric V2O5 center dot 0.5H(2)O-reduced graphene oxide (V2O5 center dot 0.5H(2)O-rGO) devices exhibited a volumetric capacitance of 136 mF cm 3, which was much higher than that of 68 mF cm-3 for PVA-NaCl and 45 mF cm(-3) for PVA-LiCl. Additionally, hybrid full cells of activated carbon doth//V2O5 center dot 0.5H(2)O-rGO delivered an energy density of 102 mu Wh cm(-3) and a power density of 73.38 mW cm3 over a wide potential window of 2 V. The present study provides direct experimental evidence for the contribution of PVA-KCl gel electrolytes toward quick redox reactions for redox-type capacitors, which is also helpful for the development of neutral pH gel electrolytes for energy storage devices.
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