Hydrogen Production Improvement on Water Decomposition Through Internal Interfacial Charge Transfer in M3(PO4)2-M2P2O7 Mixed-Phase Catalyst (M = Co, Ni, and Cu)

In this study, three types of Nasicon-type materials, Co3(PO4)2-CO2P2O7, Ni3(PO4)2-Ni<sub&...

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Main Authors:	Junyeong Kim, Jun Neoung Heo, Jeong Yeon Do, Seog Joon Yoon, Youngsoo Kim, Misook Kang
Format:	Article
Language:	English
Published:	MDPI AG 2019-07-01
Series:	Catalysts
Subjects:	M<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-M<sub>2</sub>P<sub>2</sub>O<sub>7</sub> mixed-phase catalyst hydrogen production water photosplitting Internal interfacial charge transfer
Online Access:	https://www.mdpi.com/2073-4344/9/7/602

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spelling	doaj-d4eb8c5a3cab4775bd82597f313c37472020-11-25T00:42:41ZengMDPI AGCatalysts2073-43442019-07-019760210.3390/catal9070602catal9070602Hydrogen Production Improvement on Water Decomposition Through Internal Interfacial Charge Transfer in M<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-M<sub>2</sub>P<sub>2</sub>O<sub>7</sub> Mixed-Phase Catalyst (M = Co, Ni, and Cu)Junyeong Kim0Jun Neoung Heo1Jeong Yeon Do2Seog Joon Yoon3Youngsoo Kim4Misook Kang5Department of Chemistry, College of Science, Yeungnam University, Gyeongsan, Gyeongbuk 38541, KoreaDepartment of Chemistry, College of Science, Yeungnam University, Gyeongsan, Gyeongbuk 38541, KoreaDepartment of Chemistry, College of Science, Yeungnam University, Gyeongsan, Gyeongbuk 38541, KoreaDepartment of Chemistry, College of Science, Yeungnam University, Gyeongsan, Gyeongbuk 38541, KoreaDepartment of Chemistry, College of Science, Yeungnam University, Gyeongsan, Gyeongbuk 38541, KoreaDepartment of Chemistry, College of Science, Yeungnam University, Gyeongsan, Gyeongbuk 38541, KoreaIn this study, three types of Nasicon-type materials, Co<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-CO<sub>2</sub>P<sub>2</sub>O<sub>7</sub>, Ni<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-Ni<sub>2</sub>P<sub>2</sub>O<sub>7</sub>, and Cu<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-Cu<sub>2</sub>P<sub>2</sub>O<sub>7</sub>, were synthesized as mixed-phase catalysts (MPCs) for evaluating their potential as new photocatalytic candidates (called Co<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-CO<sub>2</sub>P<sub>2</sub>O<sub>7</sub>mpc, Ni<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-Ni<sub>2</sub>P<sub>2</sub>O<sub>7</sub>mpc, and Cu<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-Cu<sub>2</sub>P<sub>2</sub>O<sub>7</sub>mpc herein). Based on various physical properties, it was confirmed that there are two phases, M<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> and M<sub>2</sub>P<sub>2</sub>O<sub>7</sub>, in which a similar phase equilibrium energy coexists. These colored powders showed UV and visible light responses suitable to our aim of developing 365-nm light-response photocatalysts for overall water-splitting. The photocatalytic performance of Ni<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>-Ni<sub>2</sub>P<sub>2</sub>O<sub>7</sub> MPC showed negligible or no activity toward H<sub>2</sub> evolution. However, Co<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>-Co<sub>2</sub>P<sub>2</sub>O<sub>7</sub> MPC and Cu<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-Cu<sub>2</sub>P<sub>2</sub>O<sub>7</sub> MPC were determined as interesting materials because of their ability to absorb visible light within a suitable band. Moreover, an internal interface charge transfer was suggested to occur that would lower the recombination rate of electrons and holes. For Cu<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-Cu<sub>2</sub>P<sub>2</sub>O<sub>7</sub> MPC, the charge separation between the electron and hole was advantageously achieved, a water-splitting reaction was promoted, and hydrogen generation was considerably increased. The performance of a catalyst depended on the nature of the active metal added. In addition, the performance of the catalyst was improved when electrons migrated between the inter-phases despite the lack of a heterojunction with other crystals.https://www.mdpi.com/2073-4344/9/7/602M<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-M<sub>2</sub>P<sub>2</sub>O<sub>7</sub> mixed-phase catalysthydrogen productionwater photosplittingInternal interfacial charge transfer
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Junyeong Kim Jun Neoung Heo Jeong Yeon Do Seog Joon Yoon Youngsoo Kim Misook Kang
spellingShingle	Junyeong Kim Jun Neoung Heo Jeong Yeon Do Seog Joon Yoon Youngsoo Kim Misook Kang Hydrogen Production Improvement on Water Decomposition Through Internal Interfacial Charge Transfer in M<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-M<sub>2</sub>P<sub>2</sub>O<sub>7</sub> Mixed-Phase Catalyst (M = Co, Ni, and Cu) Catalysts M<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-M<sub>2</sub>P<sub>2</sub>O<sub>7</sub> mixed-phase catalyst hydrogen production water photosplitting Internal interfacial charge transfer
author_facet	Junyeong Kim Jun Neoung Heo Jeong Yeon Do Seog Joon Yoon Youngsoo Kim Misook Kang
author_sort	Junyeong Kim
title	Hydrogen Production Improvement on Water Decomposition Through Internal Interfacial Charge Transfer in M<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-M<sub>2</sub>P<sub>2</sub>O<sub>7</sub> Mixed-Phase Catalyst (M = Co, Ni, and Cu)
title_short	Hydrogen Production Improvement on Water Decomposition Through Internal Interfacial Charge Transfer in M<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-M<sub>2</sub>P<sub>2</sub>O<sub>7</sub> Mixed-Phase Catalyst (M = Co, Ni, and Cu)
title_full	Hydrogen Production Improvement on Water Decomposition Through Internal Interfacial Charge Transfer in M<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-M<sub>2</sub>P<sub>2</sub>O<sub>7</sub> Mixed-Phase Catalyst (M = Co, Ni, and Cu)
title_fullStr	Hydrogen Production Improvement on Water Decomposition Through Internal Interfacial Charge Transfer in M<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-M<sub>2</sub>P<sub>2</sub>O<sub>7</sub> Mixed-Phase Catalyst (M = Co, Ni, and Cu)
title_full_unstemmed	Hydrogen Production Improvement on Water Decomposition Through Internal Interfacial Charge Transfer in M<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-M<sub>2</sub>P<sub>2</sub>O<sub>7</sub> Mixed-Phase Catalyst (M = Co, Ni, and Cu)
title_sort	hydrogen production improvement on water decomposition through internal interfacial charge transfer in m<sub>3</sub>(po<sub>4</sub>)<sub>2</sub>-m<sub>2</sub>p<sub>2</sub>o<sub>7</sub> mixed-phase catalyst (m = co, ni, and cu)
publisher	MDPI AG
series	Catalysts
issn	2073-4344
publishDate	2019-07-01
description	In this study, three types of Nasicon-type materials, Co<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-CO<sub>2</sub>P<sub>2</sub>O<sub>7</sub>, Ni<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-Ni<sub>2</sub>P<sub>2</sub>O<sub>7</sub>, and Cu<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-Cu<sub>2</sub>P<sub>2</sub>O<sub>7</sub>, were synthesized as mixed-phase catalysts (MPCs) for evaluating their potential as new photocatalytic candidates (called Co<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-CO<sub>2</sub>P<sub>2</sub>O<sub>7</sub>mpc, Ni<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-Ni<sub>2</sub>P<sub>2</sub>O<sub>7</sub>mpc, and Cu<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-Cu<sub>2</sub>P<sub>2</sub>O<sub>7</sub>mpc herein). Based on various physical properties, it was confirmed that there are two phases, M<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> and M<sub>2</sub>P<sub>2</sub>O<sub>7</sub>, in which a similar phase equilibrium energy coexists. These colored powders showed UV and visible light responses suitable to our aim of developing 365-nm light-response photocatalysts for overall water-splitting. The photocatalytic performance of Ni<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>-Ni<sub>2</sub>P<sub>2</sub>O<sub>7</sub> MPC showed negligible or no activity toward H<sub>2</sub> evolution. However, Co<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>-Co<sub>2</sub>P<sub>2</sub>O<sub>7</sub> MPC and Cu<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-Cu<sub>2</sub>P<sub>2</sub>O<sub>7</sub> MPC were determined as interesting materials because of their ability to absorb visible light within a suitable band. Moreover, an internal interface charge transfer was suggested to occur that would lower the recombination rate of electrons and holes. For Cu<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-Cu<sub>2</sub>P<sub>2</sub>O<sub>7</sub> MPC, the charge separation between the electron and hole was advantageously achieved, a water-splitting reaction was promoted, and hydrogen generation was considerably increased. The performance of a catalyst depended on the nature of the active metal added. In addition, the performance of the catalyst was improved when electrons migrated between the inter-phases despite the lack of a heterojunction with other crystals.
topic	M<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-M<sub>2</sub>P<sub>2</sub>O<sub>7</sub> mixed-phase catalyst hydrogen production water photosplitting Internal interfacial charge transfer
url	https://www.mdpi.com/2073-4344/9/7/602
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_version_	1725280993519075328

Hydrogen Production Improvement on Water Decomposition Through Internal Interfacial Charge Transfer in M<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>-M<sub>2</sub>P<sub>2</sub>O<sub>7</sub> Mixed-Phase Catalyst (M = Co, Ni, and Cu)

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