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Ultrahigh capacitive performance from both Co(OH)2/graphene electrode and K3Fe(CN)6 electrolyte
Open accessAbstract
Pseudocapacitance is commonly associated to the reversible redox reactions from electrode materials, but the enhancement in pseudocapacitance that only relies on electrode materials is limited. Here, we explore the possibility of enhancing pseudocapacitance through both Co(OH)₂/graphene nanosheets (GNS) electrode and K₃Fe(CN)₆ electrolyte. With a good conductivity and favoring electron transfer, GNS are hybridized with Co(OH)₂ to improve the pseudocapacitance of Co(OH)₂, including enhancing its rate capability and electrochemical stability. Adding K₃Fe(CN)₆ into KOH electrolyte further enhances the pseudocapacitance via both directly contributing pseudocapacitance to Co(OH)₂/GNS and promoting the electron gain and loss of Co ions. This novel Co(OH)₂/GNS-K₃Fe(CN)₆/KOH electrode system shows an ultrahigh specific capacitance of 7514 Fg⁻¹ at 16 Ag⁻¹ in mixed 1 M KOH and 0.08 M K₃Fe(CN)₆, more than 100% coulombic efficiency, and long-term cycling stability (the capacitance retention is 75% after 20000 continuous charge-discharge cycles in mixed 1 M KOH and 0.04 M K₃Fe(CN)₆.
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Cites
Ni(OH) 2 Nanoplates Grown on Graphene as Advanced Electrochemical Pseudocapacitor Materials
Wang, H., Casalongue, H. S., Liang, Y., & Dai, H. (2010) · Journal of the American Chemical Society · doi:10.1021/ja102267j · Cited by 2,042
Self-citation
Cited by
Supercapacitors Performance Evaluation
Zhang, S., & Pan, N. (2015) · Advanced Energy Materials · doi:10.1002/aenm.201401401 · Cited by 1,529
Wang, Q., Yan, J., & Fan, Z. (2016) · Energy & Environmental Science · doi:10.1039/c5ee03109e · Cited by 1,225
Sundriyal, S., Shrivastav, V., Kaur, H., Mishra, S., & Deep, A. (2018) · ACS Omega · doi:10.1021/acsomega.8b02065 · Cited by 361
Metadata
- Authors
- Zhao, C., Zheng, W., Wang, X., Zhang, H., Cui, X., & Wang, H.
- Venue
- Scientific Reports
- Published
- 2013-10-18
- Volume
- 3
- Issue
- 1
- Pages
- 2986-2986
- ISSN
- 2045-2322 (ISSN-L)
- OpenAlex
- W2015821228
- Cited by
- 196
- References
- 1
- FWCI
- 6.47
- Type
- journal article
- Language
- en
- Open access
- gold
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- Zhao, C., Zheng, W., Wang, X., Zhang, H., Cui, X., & Wang, H. (2013). Ultrahigh capacitive performance from both Co(OH)2/graphene electrode and K3Fe(CN)6 electrolyte. Scientific Reports. https://doi.org/10.1038/srep02986
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