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A new approach exploiting thermally activated delayed fluorescence molecules to optimize solar thermal energy storage

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  • Fan-Yi Meng

    (National Taiwan University, R.O.C)

  • I-Han Chen

    (National Taiwan University, R.O.C)

  • Jiun-Yi Shen

    (National Taiwan University, R.O.C)

  • Kai-Hsin Chang

    (National Taiwan University, R.O.C)

  • Tai-Che Chou

    (National Taiwan University, R.O.C)

  • Yi-An Chen

    (National Taiwan University, R.O.C)

  • Yi-Ting Chen

    (National Taiwan University, R.O.C)

  • Chi-Lin Chen

    (National Taiwan University, R.O.C)

  • Pi-Tai Chou

    (National Taiwan University, R.O.C)

Abstract

We propose a new concept exploiting thermally activated delayed fluorescence (TADF) molecules as photosensitizers, storage units and signal transducers to harness solar thermal energy. Molecular composites based on the TADF core phenoxazine–triphenyltriazine (PXZ-TRZ) anchored with norbornadiene (NBD) were synthesized, yielding compounds PZDN and PZTN with two and four NBD units, respectively. Upon visible-light excitation, energy transfer to the triplet state of NBD occurred, followed by NBD → quadricyclane (QC) conversion, which can be monitored by changes in steady-state or time-resolved spectra. The small S1-T1 energy gap was found to be advantageous in optimizing the solar excitation wavelength. Upon tuning the molecule’s triplet state energy lower than that of NBD (61 kcal/mol), as achieved by another composite PZQN, the efficiency of the NBD → QC conversion decreased drastically. Upon catalysis, the reverse QC → NBD reaction occurred at room temperature, converting the stored chemical energy back to heat with excellent reversibility.

Suggested Citation

  • Fan-Yi Meng & I-Han Chen & Jiun-Yi Shen & Kai-Hsin Chang & Tai-Che Chou & Yi-An Chen & Yi-Ting Chen & Chi-Lin Chen & Pi-Tai Chou, 2022. "A new approach exploiting thermally activated delayed fluorescence molecules to optimize solar thermal energy storage," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28489-0
    DOI: 10.1038/s41467-022-28489-0
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    References listed on IDEAS

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    1. Tschopp, Daniel & Tian, Zhiyong & Berberich, Magdalena & Fan, Jianhua & Perers, Bengt & Furbo, Simon, 2020. "Large-scale solar thermal systems in leading countries: A review and comparative study of Denmark, China, Germany and Austria," Applied Energy, Elsevier, vol. 270(C).
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    1. Li, Chuan & Li, Qi & Ge, Ruihuan, 2023. "Comparison of performance enhancement in a shell and tube based latent heat thermal energy storage device containing different structured fins," Renewable Energy, Elsevier, vol. 206(C), pages 994-1006.

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