Probing the energy conversion process in piezoelectric-driven electrochemical self-charging supercapacitor power cell using piezoelectrochemical spectroscopy

Abstract

The design and development of self-charging supercapacitor power cells are rapidly gaining interest due to their ability to convert and store energy in an integrated device. Here, we have demonstrated the fabrication of a self-charging supercapacitor using siloxene sheets as electrodes and siloxene-based polymeric piezofiber separator immobilized with an ionogel electrolyte. The self-charging properties of the fabricated device subjected to various levels of compressive forces showed their ability to self-charge up to a maximum of 207 mV. The mechanism of self-charging process in the fabricated device is discussed via "piezoelectrochemical effect" with the aid of piezoelectrochemical spectroscopy measurements. These studies revealed the direct evidence of the piezoelectrochemical phenomenon involved in the energy conversion and storage process in the fabricated device. This study can provide insight towards understanding the energy conversion process in self-charging supercapacitors, which is of significance considering the state of the art of piezoelectric driven self-charging supercapacitors.

A Review of Piezoelectric PVDF Film by Electrospinning and Its Applications

“…Another recent work by Krishnamoorthy et al [ 156 ] studied SCSPC’s energy conversion and storage mechanism related to the “piezo electrochemical effect”. The authors used the components of siloxene SCSPC (such as siloxene-coated carbon cloth electrodes, siloxene–PVDF piezofibers, and ionogels) constructed in the form of symmetric supercapacitors (SSCs) with high flexibility.…”

“…( a ) represents the preparation of siloxene sheets via topochemical deintercalation of calcium from CaSi 2 in the presence of ice-cold HCl solution, ( b ) represents the fabrication process involved in the electrospinning of siloxene/PVDF piezo fibers, and ( c ) indicates the fabrication of a siloxene SCSPC device using siloxene sheets-coated carbon cloth as two symmetric electrodes and electrospun siloxene–PVDF piezo fibers impregnated with ionogel electrolyte as the separator. Reprinted with permission from [ 156 ].…”

Two‐Dimensional Siloxene–Graphene Heterostructure‐Based High‐Performance Supercapacitor for Capturing Regenerative Braking Energy in Electric Vehicles

“…In this study, a novel SC electrode was developed by hybridizing two‐layered materials including 1) graphene or reduced graphene oxide (rGO) sheets with double‐layer capacitance [ 20 ] and 2) siloxene sheets with a pseudocapacitive nature. [ 21 ] The fabricated siloxene–rGO symmetric SCs (SSCs) using 1 m tetraethylammonium tetrafluoroborate (TEABF 4 ) electrolyte displayed exceptional performance metrics (compared to those reported for state‐of‐the‐art SSCs) due to the 2D/2D heterostructures. With the extraordinary energy–power ratios and wide temperature operation (–15 to 80 °C) of siloxene–rGO SSCs, we demonstrated their feasibility as an advanced EES system for capturing regenerative braking energy in EVs.…”

Self-charging power system for distributed energy: beyond the energy storage unit

“…32 This type of piezo-electrochemical process has also been demonstrated to be applicable to electrochemical double layer (EDL) supercapacitors ( Fig. 2b), [33][34][35][36][37] pseudocapacitive supercapacitors, 31,[38][39][40][41][42] and sodium ion batteries. 25 Wang et al provided a density functional theory (DFT) simulation to understand the mechanism of the piezo-electrochemical process in this type of SCPS ( Fig.…”