Constructing Internal Electric Field in g-C 3 N 4 Significantly Promotes the Photocatalytic Performance for H 2 O 2 Gene
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Constructing Internal Electric Field in g‑C3N4 Significantly Promotes the Photocatalytic Performance for H2O2 Generation Chuan Wang1,2 · Kai Wang1,2 · Xinxia He1,2 · Yang Liao1,2 · Hui Mao1,2 · Shilin Zhao1,2 · Jun Ma1,2 Received: 3 May 2020 / Accepted: 7 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Solar-to-H2O2 photocatalytic conversion has attracted increasing attention since H 2O2 is a vital oxidizing reagent and the solar energy is inexhaustible and sustainable. Though it has been widely recognized that the photocatalytic performance for H2O2 generation could be enhanced through P incorporating into g-C3N4 framework, its intrinsic reason is still ambiguous. In the present work, internal electronic field (IEF) was ascertained to be constructed in the framework of P doped g-C3N4 (PDCN), and its intensity could be feasibly adjusted through changing the P doping amount. Particularly, PDCN-10, as the optimum photocatalyst synthesized when the P doping amount was 10%, possessed an IEF intensity of 3.1 times than the pristine g-C3N4, leading to 10.0-folds higher of H 2O2 yield. The present research for the first time discloses the intrinsic reason for the promoted photocatalytic performance for H 2O2 generation over P doped g-C3N4, thereby providing a new insight for the design of photocatalyst with satisfactory performance via constructing IEF. Grapic Abstract
Keywords Photocatalytic generation of H2O2 · P-doped g-C3N4 · Internal electric field Chuan Wang and Kai Wang have contributed equally to this work. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10562-020-03389-4) contains supplementary material, which is available to authorized users. * Jun Ma [email protected] 1
College of Chemistry and Materials Science, Sichuan Normal University, 610068 Chengdu, People’s Republic of China
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The Engineering Research Center for the Development of Farmland Ecosystem Service Functions, Sichuan Province Institutions of Higher Education, 610068 Chengdu, People’s Republic of China
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1 Introduction
2 Experimental Section
At present, solar-to-H 2 O 2 chemical conversion has attracted increasing attentions since H 2O 2 is an important oxidizing regent and the solar energy is inexhaustible and sustainable [1, 2]. However, photocatalytic activity for H2O2 generation has always been restricted by its low apparent quantum, due to the fast combination of photogenerated charge carriers over photocatalyst [3–5]. Therefore, it is vital to further develop more suitable photocatalysts with higher efficiency for H2O2 generation. Among all the photocatalysts, g-C3N4, a metal-free polymer semiconductor, has emerged as a vital alternative to TiO2, BiVO4 and ZnO et al., due to its feasible synthesis procedure and stable physicochemical properties [6–10]. In 2014, g-C3N4 was firstly employed by Shiraishi’s group for the photocatalytic H 2O2 generation in aqueous solution [7].
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