Issue 8, 2019

Ultralong cycle life and outstanding capacitive performance of a 10.8 V metal free micro-supercapacitor with highly conducting and robust laser-irradiated graphene for an integrated storage device

Abstract

Interconnected porous graphene plays a crucial role as supercapacitive material as well as a current collector in developing metal free microsupercapacitor (MSC) because of its unique structure and superior conductivity. Electrochemical reduction followed by use of a laser irradiation method shows advances for the fabrication of the conductive graphene-based robust device. Use of Raman spectra proves that the laser irradiation method is capable of healing the defects with fused interconnected sheets, as a result, high conductivity and improved crystallinity of the laser irradiated graphene (LIG) sample is achieved. The LIG film on a flexible substrate was patterned with the aim to develop an on-chip flexible MSC, which offers a large working voltage of 1.2 V in an aqueous solid electrolyte. Interestingly, the MSC, without any metal current collector, shows a unique electrical-double layer behavior and unprecedented cycling stability. It is worth noting that the retention of the initial capacitance after 100 000 continuous cycles was 100%. A large cell voltage of 10.8 V was realized by modularizing the array of devices without much degradation of the rectangular shapes of the voltammogram even at higher scan rates (100 V s−1). The array of LIG-MSC was integrated with a commercial solar cell module for hybrid energy harvesting and as a storage device. This study provides an effective strategy to build a metal free supercapacitor with exceptional cycle life and facilitates progress towards self-sustainable energy in the future.

Graphical abstract: Ultralong cycle life and outstanding capacitive performance of a 10.8 V metal free micro-supercapacitor with highly conducting and robust laser-irradiated graphene for an integrated storage device

Supplementary files

Article information

Article type
Paper
Submitted
06 May 2019
Accepted
07 Jun 2019
First published
07 Jun 2019

Energy Environ. Sci., 2019,12, 2507-2517

Ultralong cycle life and outstanding capacitive performance of a 10.8 V metal free micro-supercapacitor with highly conducting and robust laser-irradiated graphene for an integrated storage device

N. Kamboj, T. Purkait, M. Das, S. Sarkar, K. S. Hazra and R. S. Dey, Energy Environ. Sci., 2019, 12, 2507 DOI: 10.1039/C9EE01458F

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