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Wang Z, Wu H, Wu Q, Zhao YM, Shen L. Magnetic ε-Phosphorene for Sensing Greenhouse Gas Molecules. Molecules 2023; 28:5402. [PMID: 37513274 PMCID: PMC10384796 DOI: 10.3390/molecules28145402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2023] [Revised: 07/08/2023] [Accepted: 07/12/2023] [Indexed: 07/30/2023] Open
Abstract
It is critical for gas sensors that sense greenhouse gas molecules to have both good sensitivity and selectivity for water molecules in the ambient environment. Here, we study the charge transfer, IV curves, and electric field tuning of vanadium-doped monolayer ϵ-phosphorene as a sensor for NO, NO2, and H2O gas molecules via first-principle and transport calculations. We find that the paramagnetic toxic molecules of NO and NO2 have a high adsorption energy on V-ϵ-phosphorene, which originates from a large amount of charge transfer driven by the hybridisation of the localised spin states of the host with the molecular frontier orbital. Using the non-equilibrium Green's function, we investigate the IV responses with respect to the adsorption of different molecules to study the performance of gas molecule sensors. Our IV curves show a larger amount of changes in resistance of the paramagnetic NO and NO2 than nonmagnetic H2O gas molecules, suggesting both sensitivity and selectivity. Moreover, our calculations show that an applied external electric field (gate voltage) can effectively tune the amount of charge transfer. More charge transfer makes the sensor more sensitive to the molecule, while less charge transfer can reduce the adsorption energy and remove the adsorbed molecules, allowing for the repeated use of the sensor.
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Affiliation(s)
- Zengyao Wang
- Engineering Science Programme, Faculty of Engineering, National University of Singapore, Singapore 117575, Singapore
| | - Hao Wu
- Department of Mechanical Engineering, National University of Singapore, Singapore 117575, Singapore
| | - Qingyun Wu
- Science, Mathematics and Technology, Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372, Singapore
| | - Yi-Ming Zhao
- Department of Mechanical Engineering, National University of Singapore, Singapore 117575, Singapore
| | - Lei Shen
- Engineering Science Programme, Faculty of Engineering, National University of Singapore, Singapore 117575, Singapore
- Department of Mechanical Engineering, National University of Singapore, Singapore 117575, Singapore
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Wang Y, Wang G, Huang M, Luo Z, Wang J, Ding Z, Guo X, Liu X. Electrocatalytic activity of MoSi 2N 4monolayers decorated with single transition metal atoms: a computational study. NANOTECHNOLOGY 2023; 34:245705. [PMID: 36917847 DOI: 10.1088/1361-6528/acc409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Accepted: 03/14/2023] [Indexed: 06/18/2023]
Abstract
Two-dimensional (2D) MoSi2N4is a newly created material that has superstability and ultrahigh carrier mobility. Besides, the hydrogen evolution reaction activity was proved excellent by doping transition metal (TM) atoms and introducing N vacancies. But, the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) of 2D MoSi2N4is unclear even. We have explored the electrocatalytic properties (OER/ORR) of MoSi2N4by introducing Si vacancies and attaching various TM atoms. The structure and optoelectronic characteristics of MoSi2N4have been researched in detail using density functional theory calculations. By analyzing the density of states, the free energy change diagram and contour maps of TM@VSi-MoSiN, the results show that Co@VSi-MoSiN has the lowest OER overpotential (0.53 V) among all samples. Additionally, the d-band center is used to explain the electrocatalytic origin of the OER and ORR of TM@VSi-MoSiN. Our discoveries expand the 2D TM@VSi-MoSiN applicability in the realm of catalysis.
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Affiliation(s)
- Yi Wang
- College of Big Data and Information Engineering, Guizhou University, Guiyang 550025, People's Republic of China
- Power Semiconductor Device Reliability Research Center of the Ministry of Education, Guizhou University, Guiyang 550025, People's Republic of China
- Key Laboratory of Micro-Nano-Electronics of Guizhou Province, Guiyang 550025, People's Republic of China
| | - Guang Wang
- College of Big Data and Information Engineering, Guizhou University, Guiyang 550025, People's Republic of China
| | - Mengya Huang
- College of Big Data and Information Engineering, Guizhou University, Guiyang 550025, People's Republic of China
- Key Laboratory of Micro-Nano-Electronics of Guizhou Province, Guiyang 550025, People's Republic of China
| | - Zijiang Luo
- School of Information, Guizhou University of Finance and Economics, Guiyang 550025, People's Republic of China
| | - Jihong Wang
- College of Big Data and Information Engineering, Guizhou University, Guiyang 550025, People's Republic of China
| | - Zhao Ding
- College of Big Data and Information Engineering, Guizhou University, Guiyang 550025, People's Republic of China
- Power Semiconductor Device Reliability Research Center of the Ministry of Education, Guizhou University, Guiyang 550025, People's Republic of China
- Key Laboratory of Micro-Nano-Electronics of Guizhou Province, Guiyang 550025, People's Republic of China
| | - Xiang Guo
- College of Big Data and Information Engineering, Guizhou University, Guiyang 550025, People's Republic of China
- Power Semiconductor Device Reliability Research Center of the Ministry of Education, Guizhou University, Guiyang 550025, People's Republic of China
- Key Laboratory of Micro-Nano-Electronics of Guizhou Province, Guiyang 550025, People's Republic of China
| | - Xuefei Liu
- School of Physics and Electronic Science, Guizhou Normal University, Guiyang 550025, People's Republic of China
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Structural and Optical Characterization of g-C 3N 4 Nanosheet Integrated PVC/PVP Polymer Nanocomposites. Polymers (Basel) 2023; 15:polym15040871. [PMID: 36850153 PMCID: PMC9967550 DOI: 10.3390/polym15040871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 02/03/2023] [Accepted: 02/04/2023] [Indexed: 02/12/2023] Open
Abstract
The present work considers the integration of g-C3N4 nanosheets into PVC/PVP polymer nanocomposites at ratios of 0.0, 0.3, 0.6, and 1.0 wt%. The XRD data scans showed semicrystalline structures for all PVC/PVP/g-C3N4 polymer blend films. The FTIR and Raman measurements revealed intermolecular hydrogen bonding between the g-C3N4 surface and the OH- groups of the PVC/PVP network. ESEM morphology analysis for PVC/PVP/g-C3N4 nanocomposite films displayed homogeneous surface textures. The data of TGA showed improved thermal stability as the decomposition temperature increased from 262 to 276 °C with the content of g-C3N4 (0.0-1.0 wt%). The optical absorbance data for PVC/PVP films improved after the addition of g-C3N4. The optical energy gaps showed compositional dependence on the g-C3N4 content, which changed from 5.23 to 5.34 eV at indirect allowed transitions. The refractive index for these blend films enhanced (1.83-3.96) with the inclusion of g-C3N4. Moreover, the optical susceptibility for these nanocomposite films increased as the content of g-C3N4 changed from 0.0 to 1.0 wt%. Finally, the values of the nonlinear refractive index showed improvement with the increased percentage of g-C3N4. When g-C3N4 was added up to 1.0 wt%, the DC conductivity improved from 4.21 × 10-8 to 1.78 × 10-6 S/cm. The outcomes of this study prove the suitable application of PVC/PVP/g-C3N4 in optoelectronic fiber sensors.
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Mikheev IV, Byvsheva SM, Sozarukova MM, Kottsov SY, Proskurnina EV, Proskurnin MA. High-Throughput Preparation of Uncontaminated Graphene-Oxide Aqueous Dispersions with Antioxidant Properties by Semi-Automated Diffusion Dialysis. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:4159. [PMID: 36500782 PMCID: PMC9739863 DOI: 10.3390/nano12234159] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 11/17/2022] [Accepted: 11/21/2022] [Indexed: 06/17/2023]
Abstract
A semi-automated diffusion-dialysis purification procedure is proposed for the preparation of uncontaminated graphene oxide (GO) aqueous dispersions. The purification process is integrated with analytical-signal processing to control the purification degree online by several channels: oxidation-reduction potential, conductivity, and absorbance. This approach reduces the amounts of reagents for chemical treatment during dialysis. The total transition metal (Mn and Ti) content was reduced to a sub-ppb level (assessed by slurry nebulization in inductively coupled plasma optical atomic emission spectroscopy). Purified aqueous GO samples possess good stability for about a year with a zeta-potential of ca. -40 mV and a lateral size of ca. sub-µm. Purified GO samples showed increased antioxidant properties (up to five times compared to initial samples according to chemiluminometry by superoxide-radical (O2-) generated in situ from xanthine and xanthine oxidase with the lucigenin probe) and significantly decreased peroxidase-like activity (assessed by the H2O2-L-012 system).
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Affiliation(s)
- Ivan V. Mikheev
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Sofiya M. Byvsheva
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Madina M. Sozarukova
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
- Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow 117901, Russia
| | - Sergey Yu. Kottsov
- Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow 117901, Russia
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Chen W, Liu S, Fu Y, Yan H, Qin L, Lai C, Zhang C, Ye H, Chen W, Qin F, Xu F, Huo X, Qin H. Recent advances in photoelectrocatalysis for environmental applications: Sensing, pollutants removal and microbial inactivation. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2021.214341] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Lin F, Gu YY, Li H, Wang S, Zhang X, Dong P, Li S, Wang Y, Fu R, Zhang J, Zhao C, Sun H. Direct Z-scheme SiNWs@Co 3O 4 photocathode with a cocatalyst of sludge-derived carbon quantum dots for efficient photoelectrochemical hydrogen production. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 796:148931. [PMID: 34280641 DOI: 10.1016/j.scitotenv.2021.148931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 07/05/2021] [Accepted: 07/05/2021] [Indexed: 06/13/2023]
Abstract
Solar driven photoelectrochemical (PEC) hydrogen production has attracted considerable attention, but the design of highly efficient, robust and low-cost photocathode still remains a significant challenge. Herein, we report a novel SiNWs@Co3O4Z-scheme heterojunction photocathode with carbon quantum dots eco-friendly derived from sludge (SCQDs) as the co-catalyst. The photocathode not only leads to effective separation of electron-hole pair, lower transmission resistance, and longer lifetime of charge carriers, but also elevates the stability by preventing direct contact between the SiNWs and the electrolyte as well as the self-oxidation. Simultaneously, the excellent electron transport properties of the SCQDs further improved the PEC performance. Correspondingly, a maximum current density of 14.88 mA·cm-2 was obtained at -0.67 V with the applied bias photon-to-current efficiency (ABPE) achieving 8.4% under visible light irradiations at pH = 7. This work provides a promising scheme for Si-based photocathodes for PEC hydrogen production with a high performance, reliable stability, and low-cost.
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Affiliation(s)
- Feifei Lin
- Shandong Key Laboratory of Oil & Gas Storage and Transportation Safety, China University of Petroleum (East China), Qingdao, Shandong 266580, China; College of Chemical Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China
| | - Ying-Ying Gu
- Shandong Key Laboratory of Oil & Gas Storage and Transportation Safety, China University of Petroleum (East China), Qingdao, Shandong 266580, China; College of Chemical Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China.
| | - Hongjiang Li
- Qingdao Water Group Co. Ltd., Qingdao, Shandong 266002, China
| | - Shuaijun Wang
- College of Chemical Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China
| | - Xiuxia Zhang
- College of Chemical Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China
| | - Pei Dong
- College of Chemical Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China
| | - Shi Li
- College of Chemical Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China
| | - Yongqiang Wang
- College of Chemical Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China
| | - Rongbing Fu
- Centre for Environmental Risk Management & Remediation of Soil & Groundwater, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Jinqiang Zhang
- School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA 6027, Australia
| | - Chaocheng Zhao
- College of Chemical Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China.
| | - Hongqi Sun
- School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA 6027, Australia
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Huang Z, Chen Z, Qayum A, Zhao X, Xia H, Lu F, Hu L. Enhanced photocatalytic degradation of 4-chlorophenol under visible light over carbon nitride nanosheets with carbon vacancies. NANOTECHNOLOGY 2021; 32:415704. [PMID: 34171851 DOI: 10.1088/1361-6528/ac0eac] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 06/24/2021] [Indexed: 06/13/2023]
Abstract
Two-dimensional graphitic carbon nitride (g-C3N4, GCN) is considered as one of the promising visible light-responsive photocatalysts for energy storage and environmental remediation. However, the photocatalytic performance of pristine GCN is restricted by the inherent shortcomings of rapid charge carrier recombination and limited absorption of visible light. Vacancy engineering is widely accepted as the auspicious approach for boosting the photocatalytic activity of GCN-based photocatalysts. Herein, a magnesium thermal calcination method has been developed to reconstruct GCN, in which magnesium serves as a carbon etcher for introducing carbon vacancies and pores into GCN (Vc-GCN). The fabricated Vc-GCN demonstrates excellent photocatalytic performances of degrading hazardous 4-chlorophenol under visible light irradiation benefiting from the improved carrier separating and light absorption ability as well as rich reactive sites. The optimal Vc-GCN sample delivers 2.3-fold enhancement from the pristine GCN. The work provides a tactic to prepare GCN photocatalysts with controllable carbon vacancies and for a candidate for the degradation of organic pollutants from the environment.
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Affiliation(s)
- Zanling Huang
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Guangdong, 515063, People's Republic of China
| | - Zhenjie Chen
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Guangdong, 515063, People's Republic of China
| | - Abdul Qayum
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Guangdong, 515063, People's Republic of China
| | - Xia Zhao
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Guangdong, 515063, People's Republic of China
| | - Hong Xia
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Guangdong, 515063, People's Republic of China
| | - Fushen Lu
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Guangdong, 515063, People's Republic of China
| | - Liangsheng Hu
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Guangdong, 515063, People's Republic of China
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