Enhanced Photocarrier Separation in Hierarchical Graphitic-C3N4-Supported CuInS2 for Noble-Metal-Free Z-Scheme Photocatalytic Water Splitting

Xiaoxue Li; Keyu Xie; Long Song; Mengjia Zhao; Zhipan Zhang

doi:10.1021/acsami.7b06030

Enhanced Photocarrier Separation in Hierarchical Graphitic-C₃N₄-Supported CuInS₂ for Noble-Metal-Free Z-Scheme Photocatalytic Water Splitting

Xiaoxue Li
, Keyu Xie
, Long Song
, Mengjia Zhao
, Zhipan Zhang

School of Materials Sience and Engineering

Ministry of Education of the People's Republic of China

Research output: Contribution to journal › Article › peer-review

114 Scopus citations

Abstract

The effective separation of photogenerated electrons and holes in photocatalysts is a prerequisite for efficient photocatalytic water splitting. CuInS₂ (CIS) is a widely used light absorber that works properly in photovoltaics but only shows limited performance in solar-driven hydrogen evolution due to its intrinsically severe charge recombination. Here, we prepare hierarchical graphitic C₃N₄-supported CuInS₂ (denoted as GsC) by an in situ growth of CIS directly on exfoliated thin graphitic C₃N₄ nanosheets (g-C₃N₄ NS) and demonstrate efficient separation of photoinduced charge carriers in the GsC by forming the Z-scheme system for the first time in CIS-catalyzed water splitting. Under visible light illumination, the GsC features an enhanced hydrogen evolution rate up to 1290 μmol g^-1 h^-1, which is 3.3 and 6.1 times higher than that of g-C₃N₄ NS and bare-CIS, respectively, thus setting a new performance benchmark for CIS-based water-splitting photocatalysts.

Original language	English
Pages (from-to)	24577-24583
Number of pages	7
Journal	ACS Applied Materials and Interfaces
Volume	9
Issue number	29
DOIs	https://doi.org/10.1021/acsami.7b06030
State	Published - 26 Jul 2017

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SDG 7 Affordable and Clean Energy

Keywords

Z-scheme
copper indium sulfide
graphitic carbon nitride
hydrogen generation
photocatalytic water splitting

Access to Document

10.1021/acsami.7b06030

Cite this

@article{0120dad995ed4fd7931dc12cd10f0248,

title = "Enhanced Photocarrier Separation in Hierarchical Graphitic-C3N4-Supported CuInS2 for Noble-Metal-Free Z-Scheme Photocatalytic Water Splitting",

abstract = "The effective separation of photogenerated electrons and holes in photocatalysts is a prerequisite for efficient photocatalytic water splitting. CuInS2 (CIS) is a widely used light absorber that works properly in photovoltaics but only shows limited performance in solar-driven hydrogen evolution due to its intrinsically severe charge recombination. Here, we prepare hierarchical graphitic C3N4-supported CuInS2 (denoted as GsC) by an in situ growth of CIS directly on exfoliated thin graphitic C3N4 nanosheets (g-C3N4 NS) and demonstrate efficient separation of photoinduced charge carriers in the GsC by forming the Z-scheme system for the first time in CIS-catalyzed water splitting. Under visible light illumination, the GsC features an enhanced hydrogen evolution rate up to 1290 μmol g-1 h-1, which is 3.3 and 6.1 times higher than that of g-C3N4 NS and bare-CIS, respectively, thus setting a new performance benchmark for CIS-based water-splitting photocatalysts.",

keywords = "Z-scheme, copper indium sulfide, graphitic carbon nitride, hydrogen generation, photocatalytic water splitting",

author = "Xiaoxue Li and Keyu Xie and Long Song and Mengjia Zhao and Zhipan Zhang",

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T1 - Enhanced Photocarrier Separation in Hierarchical Graphitic-C3N4-Supported CuInS2 for Noble-Metal-Free Z-Scheme Photocatalytic Water Splitting

AU - Li, Xiaoxue

AU - Xie, Keyu

AU - Song, Long

AU - Zhao, Mengjia

AU - Zhang, Zhipan

PY - 2017/7/26

Y1 - 2017/7/26

N2 - The effective separation of photogenerated electrons and holes in photocatalysts is a prerequisite for efficient photocatalytic water splitting. CuInS2 (CIS) is a widely used light absorber that works properly in photovoltaics but only shows limited performance in solar-driven hydrogen evolution due to its intrinsically severe charge recombination. Here, we prepare hierarchical graphitic C3N4-supported CuInS2 (denoted as GsC) by an in situ growth of CIS directly on exfoliated thin graphitic C3N4 nanosheets (g-C3N4 NS) and demonstrate efficient separation of photoinduced charge carriers in the GsC by forming the Z-scheme system for the first time in CIS-catalyzed water splitting. Under visible light illumination, the GsC features an enhanced hydrogen evolution rate up to 1290 μmol g-1 h-1, which is 3.3 and 6.1 times higher than that of g-C3N4 NS and bare-CIS, respectively, thus setting a new performance benchmark for CIS-based water-splitting photocatalysts.

AB - The effective separation of photogenerated electrons and holes in photocatalysts is a prerequisite for efficient photocatalytic water splitting. CuInS2 (CIS) is a widely used light absorber that works properly in photovoltaics but only shows limited performance in solar-driven hydrogen evolution due to its intrinsically severe charge recombination. Here, we prepare hierarchical graphitic C3N4-supported CuInS2 (denoted as GsC) by an in situ growth of CIS directly on exfoliated thin graphitic C3N4 nanosheets (g-C3N4 NS) and demonstrate efficient separation of photoinduced charge carriers in the GsC by forming the Z-scheme system for the first time in CIS-catalyzed water splitting. Under visible light illumination, the GsC features an enhanced hydrogen evolution rate up to 1290 μmol g-1 h-1, which is 3.3 and 6.1 times higher than that of g-C3N4 NS and bare-CIS, respectively, thus setting a new performance benchmark for CIS-based water-splitting photocatalysts.

KW - Z-scheme

KW - copper indium sulfide

KW - graphitic carbon nitride

KW - hydrogen generation

KW - photocatalytic water splitting

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