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Photocatalysis-Assisted Co₃O₄/g-C₃N₄ p-n Junction All-Solid-State Supercapacitors: A Bridge between Energy Storage and Photocatalysis.

ABSTRACT: Supercapacitors with the advantages of high power density and fast discharging rate have full applications in energy storage. However, the low energy density restricts their development. Conventional methods for improving energy density are mainly confined to doping atoms and hybridizing with other active materials. Herein, a Co₃O₄/g-C₃N₄ p-n junction with excellent capacity is developed and its application in an all-solid-state flexible device is demonstrated, whose capacity and energy density are considerably enhanced by simulated solar light irradiation. Under photoirradiation, the capacity is increased by 70.6% at the maximum current density of 26.6 mA cm^-2 and a power density of 16.0 kW kg^-1. The energy density is enhanced from 7.5 to 12.9 Wh kg^-1 with photoirradiation. The maximum energy density reaches 16.4 Wh kg^-1 at a power density of 6.4 kW kg^-1. It is uncovered that the lattice distortion of Co₃O₄, reduces defects of g-C₃N₄, and the facilitated photo-generated charge separation by the Co₃O₄/g-C₃N₄ p-n junction all make contributions to the promoted electrochemical storage performance. This work may provide a new strategy to enhance the energy density of supercapacitors and expand the application range of photocatalytic materials.

SUBMITTER: Bai L

PROVIDER: S-EPMC7675041 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature

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Publications

Photocatalysis-Assisted Co3O4/g-C3N4 p-n Junction All-Solid-State Supercapacitors: A Bridge between Energy Storage and Photocatalysis.

Bai Liqi L Huang Hongwei H Zhang Songge S Hao Lin L Zhang Zhili Z Li Hongfen H Sun Li L Guo Lina L Huang Haitao H Zhang Yihe Y

Advanced science (Weinheim, Baden-Wurttemberg, Germany) 20201001 22

Supercapacitors with the advantages of high power density and fast discharging rate have full applications in energy storage. However, the low energy density restricts their development. Conventional methods for improving energy density are mainly confined to doping atoms and hybridizing with other active materials. Herein, a Co3O4/g-C3N4 p-n junction with excellent capacity is developed and its application in an all-solid-state flexible device is demo ...[more]

PMID: 33240757

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Project description:Solar thermal fuel (STF) materials store energy through light-induced changes in the structures of photoactive molecular groups, and the stored energy is released as heat when the system undergoes reconversion to the ground-state structure. Solid-state STF devices could be useful for a range of applications; however, the light-induced structural changes required for energy storage are often limited or prevented by dense molecular packing in condensed phases. Recently, polymers have been proposed as effective solid-state STF platforms, as they can offer the bulk properties of solid materials while retaining the molecular-level free volume and/or mobility to enable local structural changes in photoresponsive groups. Light-induced energy storage and macroscopic heat release have been demonstrated for polymers with photoisomerizable azobenzene side groups. However, the mechanism of energy storage and the link between the polymer structure, energy density and storage duration has not yet been explored in detail. In this work, we present a systematic study of methacrylate- and acrylate-based polymers with azobenzene side groups to establish the mechanism of energy storage and release and the factors affecting energy density and reconversion kinetics. For polymers with directly attached azobenzene side groups, the energy storage properties are in line with previous work on similar systems, and the photoisomerization and reconversion properties of the azobenzene side groups mirror those of molecular azobenzene. However, the inclusion of an alkyl linker between the azobenzene side group and the backbone significantly increases the photoswitching efficiency, giving almost quantitative conversion to the Z isomeric state. The presence of the alkyl linker also reduces the glass transition temperature and leads to faster spontaneous thermal reconversion to the E isomeric form, but in all cases, half-lives of more than 4 days are observed in the solid state, which provides scope for applications requiring daily energy storage-release cycles. The maximum gravimetric energy density observed is 143 J g-1, which represents an increase of up to 44% compared to polymers with directly attached azobenzene moieties.

Dataset Information

Photocatalysis-Assisted Co₃O₄/g-C₃N₄ p-n Junction All-Solid-State Supercapacitors: A Bridge between Energy Storage and Photocatalysis.

Publications

Photocatalysis-Assisted Co<sub>3</sub>O<sub>4</sub>/g-C<sub>3</sub>N<sub>4</sub> p-n Junction All-Solid-State Supercapacitors: A Bridge between Energy Storage and Photocatalysis.

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