In recent years, azobenzene-containing materials for photon energy storage are gaining increasing attentions. [2][3][4][5][6][7][8] To compensate the insufficient energy density of pristine azobenzene (41 kJ mol −1 ), [9] several strategies have been designed, e.g., tethering azobenzene to rigid carbon template. [10][11][12][13][14] Although with improved energy density, such materials normally require solution state for energy charging. That is because the high packing density in solid state makes trans-to-cis isomerization difficult. And as a consequence, the photoresponsive solid-to-liquid phase change used for latent heat storage becomes impossible for such materials.

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