Pt Deposites on TiO2 for Photocatalytic H2 Evolution: Pt Is Not Only the Cocatalyst, but Also the Defect Repair Agent

Pt, as a common cocatalyst, has been widely used in photocatalytic H2 evolution. However, the specific role of Pt in photocatalytic H2 evolution has not been thoroughly studied. In this paper, by employing three Pt sources with different charges (positiv...

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Main Authors:	Zhan Shu, Yandi Cai, Jiawei Ji, Changjin Tang, Shuohan Yu, Weixin Zou, Lin Dong
Format:	Article
Language:	English
Published:	MDPI AG 2020-09-01
Series:	Catalysts
Subjects:	photocatalytic stability electropositive defect Pt sources electrostatic interaction defect repair
Online Access:	https://www.mdpi.com/2073-4344/10/9/1047

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spelling	doaj-26b10f243f824fb9b8e49b0db2918aa82020-11-25T03:06:07ZengMDPI AGCatalysts2073-43442020-09-01101047104710.3390/catal10091047Pt Deposites on TiO<sub>2</sub> for Photocatalytic H<sub>2</sub> Evolution: Pt Is Not Only the Cocatalyst, but Also the Defect Repair AgentZhan Shu0Yandi Cai1Jiawei Ji2Changjin Tang3Shuohan Yu4Weixin Zou5Lin Dong6Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Key Laboratory of Vehicle Emissions Control, School of Environment, Center of Modern Analysis, Nanjing University, Nanjing 210093, ChinaKey Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Key Laboratory of Vehicle Emissions Control, School of Environment, Center of Modern Analysis, Nanjing University, Nanjing 210093, ChinaKey Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Key Laboratory of Vehicle Emissions Control, School of Environment, Center of Modern Analysis, Nanjing University, Nanjing 210093, ChinaKey Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Key Laboratory of Vehicle Emissions Control, School of Environment, Center of Modern Analysis, Nanjing University, Nanjing 210093, ChinaKey Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Key Laboratory of Vehicle Emissions Control, School of Environment, Center of Modern Analysis, Nanjing University, Nanjing 210093, ChinaKey Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Key Laboratory of Vehicle Emissions Control, School of Environment, Center of Modern Analysis, Nanjing University, Nanjing 210093, ChinaKey Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Key Laboratory of Vehicle Emissions Control, School of Environment, Center of Modern Analysis, Nanjing University, Nanjing 210093, ChinaPt, as a common cocatalyst, has been widely used in photocatalytic H<sub>2</sub> evolution. However, the specific role of Pt in photocatalytic H<sub>2</sub> evolution has not been thoroughly studied. In this paper, by employing three Pt sources with different charges (positive, negative and neutral), we systematically studied the charge effect of Pt sources on photocatalytic H<sub>2</sub> evolution via TiO<sub>2</sub> catalyst. According to the results of Raman, X-ray photoelectron spectroscopy (XPS), recycle experiments and photocurrent characterizations, it was found that TiO<sub>2</sub> would produce electropositive defects during photocatalytic H<sub>2</sub> evolution, inevitably leading to the decline of H<sub>2</sub> production activity. Thanks to the electrostatic interaction, the electronegative Pt source not only promoted charge separation, but preferential deposited on electropositive defects, which acted as the defect repair agent, and thus resulted in the increased photocatalytic stability. This work may provide a new perspective for enhancing photocatalytic stability of hydrogen production.https://www.mdpi.com/2073-4344/10/9/1047photocatalytic stabilityelectropositive defectPt sourceselectrostatic interactiondefect repair
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Zhan Shu Yandi Cai Jiawei Ji Changjin Tang Shuohan Yu Weixin Zou Lin Dong
spellingShingle	Zhan Shu Yandi Cai Jiawei Ji Changjin Tang Shuohan Yu Weixin Zou Lin Dong Pt Deposites on TiO<sub>2</sub> for Photocatalytic H<sub>2</sub> Evolution: Pt Is Not Only the Cocatalyst, but Also the Defect Repair Agent Catalysts photocatalytic stability electropositive defect Pt sources electrostatic interaction defect repair
author_facet	Zhan Shu Yandi Cai Jiawei Ji Changjin Tang Shuohan Yu Weixin Zou Lin Dong
author_sort	Zhan Shu
title	Pt Deposites on TiO<sub>2</sub> for Photocatalytic H<sub>2</sub> Evolution: Pt Is Not Only the Cocatalyst, but Also the Defect Repair Agent
title_short	Pt Deposites on TiO<sub>2</sub> for Photocatalytic H<sub>2</sub> Evolution: Pt Is Not Only the Cocatalyst, but Also the Defect Repair Agent
title_full	Pt Deposites on TiO<sub>2</sub> for Photocatalytic H<sub>2</sub> Evolution: Pt Is Not Only the Cocatalyst, but Also the Defect Repair Agent
title_fullStr	Pt Deposites on TiO<sub>2</sub> for Photocatalytic H<sub>2</sub> Evolution: Pt Is Not Only the Cocatalyst, but Also the Defect Repair Agent
title_full_unstemmed	Pt Deposites on TiO<sub>2</sub> for Photocatalytic H<sub>2</sub> Evolution: Pt Is Not Only the Cocatalyst, but Also the Defect Repair Agent
title_sort	pt deposites on tio<sub>2</sub> for photocatalytic h<sub>2</sub> evolution: pt is not only the cocatalyst, but also the defect repair agent
publisher	MDPI AG
series	Catalysts
issn	2073-4344
publishDate	2020-09-01
description	Pt, as a common cocatalyst, has been widely used in photocatalytic H<sub>2</sub> evolution. However, the specific role of Pt in photocatalytic H<sub>2</sub> evolution has not been thoroughly studied. In this paper, by employing three Pt sources with different charges (positive, negative and neutral), we systematically studied the charge effect of Pt sources on photocatalytic H<sub>2</sub> evolution via TiO<sub>2</sub> catalyst. According to the results of Raman, X-ray photoelectron spectroscopy (XPS), recycle experiments and photocurrent characterizations, it was found that TiO<sub>2</sub> would produce electropositive defects during photocatalytic H<sub>2</sub> evolution, inevitably leading to the decline of H<sub>2</sub> production activity. Thanks to the electrostatic interaction, the electronegative Pt source not only promoted charge separation, but preferential deposited on electropositive defects, which acted as the defect repair agent, and thus resulted in the increased photocatalytic stability. This work may provide a new perspective for enhancing photocatalytic stability of hydrogen production.
topic	photocatalytic stability electropositive defect Pt sources electrostatic interaction defect repair
url	https://www.mdpi.com/2073-4344/10/9/1047
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Pt Deposites on TiO<sub>2</sub> for Photocatalytic H<sub>2</sub> Evolution: Pt Is Not Only the Cocatalyst, but Also the Defect Repair Agent

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