The incorporation of cocatalyst cobalt sulfide into graphitic carbon nitride: Boosted photocatalytic hydrogen evolution performance and mechanism exploration
2D-layered graphitic carbon nitride (g-C3N4) is regarded as a great prospect as a photocatalyst for H2 generation. However, g-C3N4's photocatalytic hydrogen evolution (HER) activity is significantly restricted by the recombination of photocarriers. We find that cobalt sulfide (CoS2) as a cocata...
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KeAi Communications Co., Ltd.
2023-06-01
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| Series: | Nano Materials Science |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2589965122000162 |
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| author | Zhangqian Liang Yanjun Xue Xinyu Wang Xiaoli Zhang Jian Tian Hongzhi Cui |
| author_facet | Zhangqian Liang Yanjun Xue Xinyu Wang Xiaoli Zhang Jian Tian Hongzhi Cui |
| author_sort | Zhangqian Liang |
| collection | DOAJ |
| description | 2D-layered graphitic carbon nitride (g-C3N4) is regarded as a great prospect as a photocatalyst for H2 generation. However, g-C3N4's photocatalytic hydrogen evolution (HER) activity is significantly restricted by the recombination of photocarriers. We find that cobalt sulfide (CoS2) as a cocatalyst can promote g-C3N4 nanosheets (NSs) to realize very efficient photocatalytic H2 generation. The prepared CoS2/g-C3N4 hybrids display highly boosted photocatalytic H2 generation performance and outstanding cycle stability. The optimized 7%-CoS2/g-C3N4 hybrids show a much improved photocatalytic H2 generation rate of 36.2 μmol−1 h−1, which is about 180 times as much as bare g-C3N4 (0.2 μmol−1 h−1). In addition, the apparent quantum efficiency (AQE) of all the samples was computed under light at λ=370 nm, in which the AQE of 7%-CoS2/g-C3N4 hybrids is up to 5.72%. The experimental data and the DFT calculation suggest that the CoS2/g-C3N4 hybrid's excellent HER activity is attributable to the lower overpotential and the smaller Co-H bond activation energy for HER. Accordingly, the CoS2 cocatalyst loading effectively boosts the photocatalytic performance of g-C3N4 for H2 evolution. The project promotes fast development of high-efficiency photocatalysts and low-cost for photocatalytic H2 generation. |
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| format | Article |
| id | doaj.art-069a3ba7e4884392912d69d76273385e |
| institution | Directory Open Access Journal |
| issn | 2589-9651 |
| language | English |
| last_indexed | 2024-03-13T00:27:41Z |
| publishDate | 2023-06-01 |
| publisher | KeAi Communications Co., Ltd. |
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| series | Nano Materials Science |
| spelling | doaj.art-069a3ba7e4884392912d69d76273385e2023-07-11T04:06:39ZengKeAi Communications Co., Ltd.Nano Materials Science2589-96512023-06-0152202209The incorporation of cocatalyst cobalt sulfide into graphitic carbon nitride: Boosted photocatalytic hydrogen evolution performance and mechanism explorationZhangqian Liang0Yanjun Xue1Xinyu Wang2Xiaoli Zhang3Jian Tian4Hongzhi Cui5School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, ChinaSchool of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, ChinaSchool of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, ChinaSchool of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, ChinaSchool of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, China; Corresponding author.School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, China; Corresponding author.2D-layered graphitic carbon nitride (g-C3N4) is regarded as a great prospect as a photocatalyst for H2 generation. However, g-C3N4's photocatalytic hydrogen evolution (HER) activity is significantly restricted by the recombination of photocarriers. We find that cobalt sulfide (CoS2) as a cocatalyst can promote g-C3N4 nanosheets (NSs) to realize very efficient photocatalytic H2 generation. The prepared CoS2/g-C3N4 hybrids display highly boosted photocatalytic H2 generation performance and outstanding cycle stability. The optimized 7%-CoS2/g-C3N4 hybrids show a much improved photocatalytic H2 generation rate of 36.2 μmol−1 h−1, which is about 180 times as much as bare g-C3N4 (0.2 μmol−1 h−1). In addition, the apparent quantum efficiency (AQE) of all the samples was computed under light at λ=370 nm, in which the AQE of 7%-CoS2/g-C3N4 hybrids is up to 5.72%. The experimental data and the DFT calculation suggest that the CoS2/g-C3N4 hybrid's excellent HER activity is attributable to the lower overpotential and the smaller Co-H bond activation energy for HER. Accordingly, the CoS2 cocatalyst loading effectively boosts the photocatalytic performance of g-C3N4 for H2 evolution. The project promotes fast development of high-efficiency photocatalysts and low-cost for photocatalytic H2 generation.http://www.sciencedirect.com/science/article/pii/S2589965122000162Non-precious-metal cocatalystsPhotocatalytic hydrogen evolution reactionCoS2 cocatalysts2D-layered g-C3N4 |
| spellingShingle | Zhangqian Liang Yanjun Xue Xinyu Wang Xiaoli Zhang Jian Tian Hongzhi Cui The incorporation of cocatalyst cobalt sulfide into graphitic carbon nitride: Boosted photocatalytic hydrogen evolution performance and mechanism exploration Nano Materials Science Non-precious-metal cocatalysts Photocatalytic hydrogen evolution reaction CoS2 cocatalysts 2D-layered g-C3N4 |
| title | The incorporation of cocatalyst cobalt sulfide into graphitic carbon nitride: Boosted photocatalytic hydrogen evolution performance and mechanism exploration |
| title_full | The incorporation of cocatalyst cobalt sulfide into graphitic carbon nitride: Boosted photocatalytic hydrogen evolution performance and mechanism exploration |
| title_fullStr | The incorporation of cocatalyst cobalt sulfide into graphitic carbon nitride: Boosted photocatalytic hydrogen evolution performance and mechanism exploration |
| title_full_unstemmed | The incorporation of cocatalyst cobalt sulfide into graphitic carbon nitride: Boosted photocatalytic hydrogen evolution performance and mechanism exploration |
| title_short | The incorporation of cocatalyst cobalt sulfide into graphitic carbon nitride: Boosted photocatalytic hydrogen evolution performance and mechanism exploration |
| title_sort | incorporation of cocatalyst cobalt sulfide into graphitic carbon nitride boosted photocatalytic hydrogen evolution performance and mechanism exploration |
| topic | Non-precious-metal cocatalysts Photocatalytic hydrogen evolution reaction CoS2 cocatalysts 2D-layered g-C3N4 |
| url | http://www.sciencedirect.com/science/article/pii/S2589965122000162 |
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