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Substrate integrated Lead-Carbon hybrid ultracapacitor with flooded, absorbent glass mat and silica-gel electrolyte configurations

Banerjee, A and Ravikumar, MK and Jalajakshi, A and Kumar, Suresh P and Gaffoor, SA and Shukla, AK (2012) Substrate integrated Lead-Carbon hybrid ultracapacitor with flooded, absorbent glass mat and silica-gel electrolyte configurations. In: Journal of Chemical Sciences, 124 (4). pp. 747-762.

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Official URL: http://link.springer.com/article/10.1007/s12039-01...

Abstract

Lead-Carbon hybrid ultracapacitors (Pb-C HUCs) with flooded, absorbent-glass-mat (AGM) and silica-gel sulphuric acid electrolyte configurations are developed and performance tested. Pb-C HUCs comprise substrate-integrated PbO2 (SI-PbO2) as positive electrodes and high surface-area carbon with graphite-sheet substrate as negative electrodes. The electrode and silica-gel electrolyte materials are characterized by XRD, XPS, SEM, TEM, Rheometry, BET surface area, and FTIR spectroscopy in conjunction with electrochemistry. Electrochemical performance of SI-PbO2 and carbon electrodes is studied using cyclic voltammetry with constant-current charge and discharge techniques by assembling symmetric electrical-double-layer capacitors and hybrid Pb-C HUCs with a dynamic Pb(porous)/PbSO4 reference electrode. The specific capacitance values for 2 V Pb-C HUCs are found to be 166 F/g, 102 F/g and 152 F/g with a faradaic efficiency of 98%, 92% and 88% for flooded, AGM and gel configurations, respectively.

Item Type: Journal Article
Additional Information: Copyright for this article is belongs to Indian Academy of Sciences.
Keywords: Hybrid ultracapacitor;substrate-integrated PbO2 electrode; silica-gel electrolyte
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 07 Dec 2012 10:23
Last Modified: 07 Dec 2012 10:23
URI: http://eprints.iisc.ernet.in/id/eprint/45209

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