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Journal Article 2

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2017 1

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Photoelectrochemistry 1

Photogenerated charge separation 1

Si 1

aromatic unit 1

band structure engineering 1

photoelectrochemistry 1

polyimide (PI) film 1

α-Fe₂O₃ 1

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Enhanced photoelectrochemical water splitting with a donor-acceptor polyimide

Frontiers in Energy doi: 10.1007/s11708-023-0910-8

Abstract: Polyimide (PI) has emerged as a promising organic photocatalyst owing to its distinct advantages of high visible-light response, facile synthesis, molecularly tunable donor-acceptor structure, and excellent physicochemical stability. However, the synthesis of high-quality PI photoelectrode remains a challenge, and photoelectrochemical (PEC) water splitting for PI has been less studied. Herein, the synthesis of uniform PI photoelectrode films via a simple spin-coating method was reported, and their PEC properties were investigated using melamine as donor and various anhydrides as acceptors. The influence of the conjugate size of aromatic unit (phenyl, biphenyl, naphthalene, perylene) of electron acceptor on PEC performance were studied, where naphthalene-based PI photoelectrode exhibited the highest photocurrent response. This is resulted from the unification of wide-range light absorption, efficient charge separation and transport, and strong photooxidation capacity. This paper expands the material library of polymer films for PEC applications and contributes to the rational design of efficient polymer photoelectrodes.

Keywords： polyimide (PI) film photoelectrochemistry band structure engineering aromatic unit

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Covering α-Fe

Jing Gu, Hongtao Yu, Xie Quan, Shuo Chen

Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 6, doi: 10.1007/s11783-017-0957-z

Abstract: The spontaneous oxidation process of pristine silicon (Si) limits its application as photocatalyst or electrode in aqueous solution or moist air. Covering a protection layer on Si surface is an effective approach to overcome this disadvantage. In this paper, α-Fe O is demonstrated to be an excellent alternative as a protection material. α-Fe O layer was deposited around each p-type Si micropillar (SiMP) in well-ordered array by chemical bath deposition method. The diameter of SiMP was 5 mm and the thickness of α-Fe O layer was about 20 nm. The photoeletrochemical stability of SiMP/α-Fe O was proved by 10 circles cyclic voltammetry testing. Compared with SiMP, its optical absorption and photocurrent density improved 2 times and 4 times, respectively, and its onset potential for hydrogen evolution moved positively about 0.4 V. These improved performances could be ascribed to the enhanced photogenerated-charge-separation efficiency deriving from built-in electric field at the interface between Si and α-Fe O . The above results show an effective strategy to utilize Si material as photocatalyst or electrode in aqueous solution or moist air.

Keywords： Si α-Fe₂O₃ Photoelectrochemistry Photogenerated charge separation