Issue 25, 2024

A Förster resonance energy transfer enabled photo-rechargeable battery with an energetically misaligned Cu-porphyrin dye/Cu:V2O5 photocathode

Abstract

This study introduces a novel photo-rechargeable battery featuring a photocathode that comprises TiO2 co-sensitized with copper tetraphenylporphyrin (CuTPP) dye and copper-doped vanadium pentoxide (Cu:V2O5). In an unbiased mode under illumination, this architecture facilitates charging up to 1.4 V, delivering a photocharging capacity of 91 mA h g−1, a feat made possible by Förster Resonance Energy Transfer (FRET) from Cu:V2O5 to CuTPP dye. The energy level mismatch inherent in these materials restricts direct photo-excited charge injection but enables a highly proficient energy transfer, accomplishing a FRET efficiency of 29.2%, attained at a Förster distance of 3.3 nm. This process yields a photocharging capacity of 268 mA h g−1 under 1 sun irradiance, a significant enhancement from 210 mA h g−1 capacity in the dark, both determined at 100 mA g−1. The V2O5 analogue of this photo-battery exhibits a reduced performance owing to lower electrical conductivity and inefficient charge separation. Both V2O5 and Cu:V2O5-based photo-batteries demonstrate respectable overall photoconversion and storage efficiencies, recording 3.9% and 3.3% respectively. The TiO2/CuTPP/Cu:V2O5/Zn2+/Zn flakes-activated carbon/Ni photo-battery shows promising longevity as it maintains ∼100% of its initial capacity in light, indicating a commendable cycling stability. This investigation proposes a paradigm shift for photo-battery development by obviating the necessity for energy-level-aligned photocathodes.

Graphical abstract: A Förster resonance energy transfer enabled photo-rechargeable battery with an energetically misaligned Cu-porphyrin dye/Cu:V2O5 photocathode

Supplementary files

Article information

Article type
Paper
Submitted
13 Oct 2023
Accepted
04 Mar 2024
First published
14 Mar 2024

J. Mater. Chem. A, 2024,12, 15203-15226

A Förster resonance energy transfer enabled photo-rechargeable battery with an energetically misaligned Cu-porphyrin dye/Cu:V2O5 photocathode

S. Naskar, D. Maity, A. Dixit, M. Freitag, K. Kumari, S. K. Singh and M. Deepa, J. Mater. Chem. A, 2024, 12, 15203 DOI: 10.1039/D3TA06248A

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