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Bansal L, Sahu B, Rath DK, Ahlawat N, Ghosh T, Kandpal S, Kumar R. Stoichiometrically Optimized Electrochromic Complex [V 2 O 2+ξ (OH) 3-ξ ] Based Electrode: Prototype Supercapacitor with Multicolor Indicator. Small 2024:e2312215. [PMID: 38497820 DOI: 10.1002/smll.202312215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2023] [Revised: 02/29/2024] [Indexed: 03/19/2024]
Abstract
The systematic structure modification of metal oxides is becoming more attractive, and effective strategies for structural tunning are highly desirable for improving their practical color-modulating energy storage performances. Here, the ability of a stoichiometrically tuned oxide-hydroxide complex of porous vanadium oxide, namely [V2 O2+ξ (OH)3-ξ ]ξ = 0:3 for multifunctional electrochromic supercapacitor application is demonstrated. Theoretically, the pre-optimized oxide complex is synthesized using a simple wet chemical etching technique in its optimized stoichiometry [V2 O2+ξ (OH)3-ξ ] with ξ = 0, providing more electroactive surface sites. The multifunctional electrode shows a high charge storage property of 610 Fg-1 at 1A g-1 , as well as good electrochromic properties with high color contrast of 70% and 50% at 428 and 640 nm wavelengths, faster switching, and high coloration efficiency. When assembled in a solid-state symmetric electrochromic supercapacitor device, it exhibits an ultrahigh power density of 1066 mWcm-2 , high energy density of 246 mWhcm-2 , and high specific capacitance of 290 mFcm-2 at 0.2 mAcm-2 . A prepared prototype device displays red when fully charged, green when half charged, and blue when fully discharged. A clear evidence of optimizing the multifunctional performance of electrochromic supercapacitor by stoichiometrical tuning is presented along with demonstrating a device prototype of a 25 cm2 large device for real-life applications.
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Affiliation(s)
- Love Bansal
- Materials and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol, 453552, India
| | - Bhumika Sahu
- Materials and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol, 453552, India
| | - Deb Kumar Rath
- Materials and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol, 453552, India
| | - Nikita Ahlawat
- Materials and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol, 453552, India
| | - Tanushree Ghosh
- Materials and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol, 453552, India
- Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario, M5S 3G8, Canada
| | - Suchita Kandpal
- Materials and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol, 453552, India
- Department of Chemical and Biomolecular Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Rajesh Kumar
- Materials and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol, 453552, India
- Centre for Advanced Electronics, Indian Institute of Technology Indore, Simrol, 453552, India
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