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Energy conversion and storage via photoinduced polarization change in non-ferroelectric molecular [CoGa] crystals.

ABSTRACT: To alleviate the energy and environmental crisis, in the last decades, energy harvesting by utilizing optical control has emerged as a promising solution. Here we report a polar crystal that exhibits photoenergy conversion and energy storage upon light irradiation. The polar crystal consists of dinuclear [CoGa] molecules, which are oriented in a uniform direction inside the crystal lattice. Irradiation with green light induces a directional intramolecular electron transfer from the ligand to a low-spin Co^III centre, and the resultant light-induced high-spin Co^II excited state is trapped at low temperature, realizing energy storage. Additionally, electric current release is observed during relaxation from the trapped light-induced metastable state to the ground state, because the intramolecular electron transfer in the relaxation process is accompanied with macroscopic polarization switching at the single-crystal level. It demonstrates that energy storage and conversion to electrical energy is realized in the [CoGa] crystals, which is different from typical polar pyroelectric compounds that exhibit the conversion of thermal energy into electricity.

SUBMITTER: Sadhukhan P

PROVIDER: S-EPMC10256679 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature

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Energy conversion and storage via photoinduced polarization change in non-ferroelectric molecular [CoGa] crystals.

Sadhukhan Pritam P Wu Shu-Qi SQ Kanegawa Shinji S Su Sheng-Qun SQ Zhang Xiaopeng X Nakanishi Takumi T Long Jeremy Ian JI Gao Kaige K Shimada Rintaro R Okajima Hajime H Sakamoto Akira A Chiappella Joy G JG Huzan Myron S MS Kroll Thomas T Sokaras Dimosthenis D Baker Michael L ML Sato Osamu O

Nature communications 20230609 1

To alleviate the energy and environmental crisis, in the last decades, energy harvesting by utilizing optical control has emerged as a promising solution. Here we report a polar crystal that exhibits photoenergy conversion and energy storage upon light irradiation. The polar crystal consists of dinuclear [CoGa] molecules, which are oriented in a uniform direction inside the crystal lattice. Irradiation with green light induces a directional intramolecular electron transfer from the ligand to a l ...[more]

PMID: 37296168

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Project description:Dielectrics that undergo electric-field-induced phase changes are promising for use as high-power electrical energy storage materials and transducers. We demonstrate the stepwise on/off switching of large polarization in a series of dielectrics by flipping their antipolar or canted electric dipoles via proton transfer and inducing simultaneous geometric changes in their π-conjugation system. Among antiferroelectric organic molecular crystals, the largest-magnitude polarization jump was obtained as 18 μC cm-2 through revisited measurements of squaric acid (SQA) crystals with improved dielectric strength. The second-best polarization jump of 15.1 μC cm-2 was achieved with a newly discovered antiferroelectric, furan-3,4-dicarboxylic acid. The field-induced dielectric phase changes show rich variations in their mechanisms. The quadruple polarization hysteresis loop observed for a 3-(4-chlorophenyl)propiolic acid crystal was caused by a two-step phase transition with moderate polarization jumps. The ferroelectric 2-phenylmalondialdehyde single crystal having canted dipoles behaved as an amphoteric dielectric, exhibiting a single or double polarization hysteresis loop depending on the direction of the external field. The magnitude of a series of observed polarizations was consistently reproduced within the simplest sublattice model by the density functional theory calculations of dipole moments flipping over a hydrogen-bonded chain or sheet (sublattice) irrespective of compounds. This finding guarantees a tool that will deepen our understanding of the microscopic phase-change mechanisms and accelerate the materials design and exploration for improving energy-storage performance. The excellent energy-storage performance of SQA was demonstrated by both a high recoverable energy-storage density W r of 3.3 J cm-3 and a nearly ideal efficiency (90%). Because of the low crystal density, the corresponding energy density per mass (1.75 J g-1) exceeded those derived from the highest W r values (∼8-11 J cm-3) reported for several bulk antiferroelectric ceramics , without modification to relaxor forms.

Dataset Information

Energy conversion and storage via photoinduced polarization change in non-ferroelectric molecular [CoGa] crystals.

Publications

Energy conversion and storage via photoinduced polarization change in non-ferroelectric molecular [CoGa] crystals.

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