Graphene-based miniaturized supercapacitors, obtained via laser conversion of suitable precursors, have been attracting recent attention for the production of energy storage small-scale devices. In this work, a one-pot synthesis of TiO2 nanoparticles embedded in porous graphene-based electrodes has been obtained with the LightScribe® technology, by converting the precursor materials through the absorption of a DVD burner infrared laser light. Enhanced electrochemical performance of devices has been achieved thanks to the combination of faradic surface reactions, arising from metal oxide nanoparticles, with the conventional electrochemical double layer capacitance, arising from porous graphene. Microsupercapacitors, consisting of TiO2-graphene electrodes, have been tested by investigating two hydrogel polymer electrolytes, based on polyvinyl alcohol/H3PO4 and polyvinyl alcohol/H2SO4, respectively. Specific areal capacitance up to 9.9 mF/cm2 are obtained in TiO2-graphene devices, corresponding to a volumetric capacitance of 13 F/cm3 and doubling the pristine graphene-based device results. The microsupercapacitors achieved specific areal energy and specific areal power of 0.22 mWh/cm2 and 39 mW/cm2, along with a cyclability greater than 3000 cycles. These high-performance results suggest laser-scribed TiO2-graphene nanostructures as remarkable candidates in micro-supercapacitors for environmentfriendly, large-scale and low-cost applications.

In situ decoration of laser-scribed graphene with TiO2 nanoparticles for scalable high-performance micro-supercapacitors / Fornasini, Laura; Scaravonati, Silvio; Magnani, Giacomo; Morenghi, Alberto; Sidoli, Michele; Bersani, Danilo; Bertoni, Giovanni; Aversa, Lucrezia; Verucchi, Roberto; Riccò, Mauro; Lottici, Pier Paolo; Pontiroli, Daniele. - In: CARBON. - ISSN 0008-6223. - 176(2021), pp. 296-306. [10.1016/j.carbon.2021.01.129]

In situ decoration of laser-scribed graphene with TiO2 nanoparticles for scalable high-performance micro-supercapacitors

Fornasini, Laura;Scaravonati, Silvio;Magnani, Giacomo;Morenghi, Alberto;Sidoli, Michele;Bersani, Danilo;Riccò, Mauro;Lottici, Pier Paolo;Pontiroli, Daniele
2021

Abstract

Graphene-based miniaturized supercapacitors, obtained via laser conversion of suitable precursors, have been attracting recent attention for the production of energy storage small-scale devices. In this work, a one-pot synthesis of TiO2 nanoparticles embedded in porous graphene-based electrodes has been obtained with the LightScribe® technology, by converting the precursor materials through the absorption of a DVD burner infrared laser light. Enhanced electrochemical performance of devices has been achieved thanks to the combination of faradic surface reactions, arising from metal oxide nanoparticles, with the conventional electrochemical double layer capacitance, arising from porous graphene. Microsupercapacitors, consisting of TiO2-graphene electrodes, have been tested by investigating two hydrogel polymer electrolytes, based on polyvinyl alcohol/H3PO4 and polyvinyl alcohol/H2SO4, respectively. Specific areal capacitance up to 9.9 mF/cm2 are obtained in TiO2-graphene devices, corresponding to a volumetric capacitance of 13 F/cm3 and doubling the pristine graphene-based device results. The microsupercapacitors achieved specific areal energy and specific areal power of 0.22 mWh/cm2 and 39 mW/cm2, along with a cyclability greater than 3000 cycles. These high-performance results suggest laser-scribed TiO2-graphene nanostructures as remarkable candidates in micro-supercapacitors for environmentfriendly, large-scale and low-cost applications.
In situ decoration of laser-scribed graphene with TiO2 nanoparticles for scalable high-performance micro-supercapacitors / Fornasini, Laura; Scaravonati, Silvio; Magnani, Giacomo; Morenghi, Alberto; Sidoli, Michele; Bersani, Danilo; Bertoni, Giovanni; Aversa, Lucrezia; Verucchi, Roberto; Riccò, Mauro; Lottici, Pier Paolo; Pontiroli, Daniele. - In: CARBON. - ISSN 0008-6223. - 176(2021), pp. 296-306. [10.1016/j.carbon.2021.01.129]
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11381/2888033
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 17
  • ???jsp.display-item.citation.isi??? 17
social impact