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Dark photocatalysis is the ability of a photocatalyst to accumulate photocarriers during light irradiation and consume them for redox reactions under dark conditions. This phenomenon of photocatalysts storing photocarriers is known as charge accumulation. Dark photocatalysts can mitigate fluctuations in photocatalytic reaction efficiency in response to fluctuating solar irradiation. Potassium poly(heptazine imide) (K-PHI) has attracted considerable attention due to its high photocatalytic efficiency and ability to undergo dark photocatalysis. However, the detailed mechanism of charge accumulation in K-PHI remains unclear because photochromism, potassium ion desorption, and charge accumulation occur simultaneously triggered by light irradiation, limiting the comprehensive understanding of this mechanism. To elucidate the charge accumulation mechanism in K-PHI, highly oriented K-PHI thin films were prepared. Then, their fundamental physical properties and optical response of their electrical properties were investigated. We succeeded in separately observing photochromism, potassium ion desorption, and charge accumulation induced by light irradiation on K-PHI and proposed a comprehensive model to explain these phenomena. This study not only provides insights into the unique physical phenomena exhibited by K-PHI but also contributes to the development of solar energy–storage materials in the future.

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• https://creativecommons.org/licenses/by/3.0/legalcode
  

Keyword: Dark photocatalysts, Potassium poly(heptazine imide), Charge accumulation mechanism, Light irradiation

Date published: 2024-07-09

Publisher: Royal Society of Chemistry (RSC)

Journal:

• Physical Chemistry Chemical Physics (ISSN: 14639076) vol. 26 issue. 30 p. 20585-20597

Funding:

• Japan Society for the Promotion of Science 23KJ1967
• Japan Science and Technology Agency JPMJSP2151

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1039/d4cp02012j

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Updated at: 2024-11-11 16:30:21 +0900

Published on MDR: 2024-11-11 16:30:22 +0900