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Mantilla Á, Guerrero-Araque D, Sierra-Uribe JH, Lartundo-Rojas L, Gómez R, Calderon HA, Zanella R, Ramírez-Ortega D. Highly efficient mobility, separation and charge transfer in black SnO 2-TiO 2 structures with co-catalysts: the key step for the photocatalytic hydrogen evolution. RSC Adv 2024; 14:26259-26271. [PMID: 39161446 PMCID: PMC11332590 DOI: 10.1039/d4ra03731f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2024] [Accepted: 07/26/2024] [Indexed: 08/21/2024] Open
Abstract
Oxygen vacancies and co-catalysts enhance photocatalytic hydrogen production by improving the charge carrier separation. Herein, the black SnO2-TiO2 structure (BST) was synthesized for the first time by two consecutive methods. First, the sol-gel nucleation method allowed TiO2 to form on the SnO2 nanoparticles, creating a strong interaction and direct contact between them. Subsequently, this structure was reduced by NaBH4 during thermal treatment, generating (Ti3+/Sn2+) states to form the BST. Then, 2 wt% of Co, Cu or Pd was impregnated onto BST. The results showed that the activity raised with the presence of Ti3+/Sn2+ states, reaching a hydrogen generation rate of 147.50 μmol g-1 h-1 with BST in comparison with the rate of 99.50 μmol g-1 h-1 for white SnO2-TiO2. On the other hand, the interaction of the co-catalysts with the BST structure helped to increase the photocatalytic hydrogen production rates: 154.10 μmol g-1 h-1, 384.18 μmol g-1 h-1 and 480.20 μmol g-1 h-1 for cobalt-BST, copper-BST and palladium-BST, respectively. The results can be associated with the creation of Ti3+/Sn2+ at the BST interface that changes the lifetime of the charge carrier, improving the separation of photogenerated electrons and holes and the co-catalysts in the structures move the flat band position and increasing the photocurrent response to having electrons with greater reducing power.
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Affiliation(s)
- Ángeles Mantilla
- Instituto Politécnico Nacional, Laboratorio de Fotocatálisis, CICATA-Legaria Legaria 694, Col. Irrigación 11500 Mexico City Mexico
| | - Diana Guerrero-Araque
- CONAHCyT-Universidad Autónoma Metropolitana, Departamento de Química Av. San Rafael Atlixco 156 09340 Mexico City Mexico
| | - Jhon Harrison Sierra-Uribe
- Universidad Autónoma Metropolitana, Departamento de Química Av. San Rafael Atlixco 156 09340 Mexico City Mexico
| | - Luis Lartundo-Rojas
- Instituto Politécnico Nacional, Centro de Nanociencias y Micro y Nanotecnología, Zacatenco Mexico City Mexico
| | - Ricardo Gómez
- Universidad Autónoma Metropolitana, Departamento de Química Av. San Rafael Atlixco 156 09340 Mexico City Mexico
| | - Héctor A Calderon
- Instituto Politécnico Nacional, ESFM, Departamento de Física, UPALM Miguel Othon de Mendizabal s/n 07320 Mexico City Mexico
| | - Rodolfo Zanella
- Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de México, Ciudad Universitaria Circuito Exterior S/N, Coyoacan 04510 Mexico City Mexico
| | - David Ramírez-Ortega
- Instituto Politécnico Nacional, Laboratorio de Fotocatálisis, CICATA-Legaria Legaria 694, Col. Irrigación 11500 Mexico City Mexico
- Instituto Politécnico Nacional-ENCB Edificio 8, Av. Luis Enrique Erro S/N, UPALM 07738 Mexico City Mexico
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Otgonbayar Z, Kim J, Jekal S, Kim CG, Noh J, Oh WC, Yoon CM. Designing a highly near infrared-reflective black nanoparticles for autonomous driving based on the refractive index and principle. J Colloid Interface Sci 2024; 667:663-678. [PMID: 38670010 DOI: 10.1016/j.jcis.2024.04.133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 03/30/2024] [Accepted: 04/19/2024] [Indexed: 04/28/2024]
Abstract
HYPOTHESIS The development of highly NIR reflective black single-shell hollow nanoparticles (BSS-HNPs) can overcome the Light Detection and Ranging (LiDAR) sensor limitations of dark-tone materials. The crystalline phase of TiO2 and the refractive index can be controlled by calcination temperature. The formation of hollow structure and the refractive index is expected to simultaneously increase the light reflection and LiDAR detectability. EXPERIMENTS The BSS-HNPs are synthesized using the sol-gel method, calcination, NaBH4 reduction, and etching to form a hollow structure with true blackness. The computational bandgap calculation is conducted to determine the bandgap energy (Eg) of the white and black TiO2 with different crystalline structures. The blackness of the as-synthesized materials is determined by the Commission on Illumination (CIE) L*a*b* color system. FINDINGS The hydrophilic nature of BSS-HNPs enables the formulation of hydrophilic paints, allowing the mono-layer coating. With the synergistic effects of hollow structure and the refractive index, BSS-HNPs manifested superb NIR reflectance at LiDAR detection wavelengths. The high detectability, blackness, and hollow structure of BSS-HNPs can expand the variety of LiDAR-detectable dark-tone materials.
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Affiliation(s)
- Zambaga Otgonbayar
- Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejeon 34158, Korea
| | - Jiwon Kim
- Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejeon 34158, Korea
| | - Suk Jekal
- Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejeon 34158, Korea
| | - Chan-Gyo Kim
- Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejeon 34158, Korea
| | - Jungchul Noh
- McKetta Department of Chemical Engineering and Texas Material Institute, The University of Texas at Austin, Austin, TX 78712, USA
| | - Won-Chun Oh
- Department of Advanced Materials Science & Engineering, Hanseo University, 46 Hanseo 1-ro, Seosan-si, Chungnam 356-706, Korea
| | - Chang-Min Yoon
- Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejeon 34158, Korea.
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Hu Y, Yan Z, Du L, Yu Y, Huang W, Shi Q. Mesoporous black TiO 2 hollow shells with controlled cavity size for enhanced visible light photocatalysis. OPTICS EXPRESS 2023; 31:33883-33897. [PMID: 37859158 DOI: 10.1364/oe.503344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 09/18/2023] [Indexed: 10/21/2023]
Abstract
Black TiO2 formed by introducing lattice disorder into pristine TiO2 has a narrowed band gap and suppresses the recombination of charge carriers. This provides a potential strategy for visible light photocatalysis. However, the microstructural design of black TiO2 for a higher optimization of visible light is still in high demand. In this work, we proposed the preparation of black TiO2 hollow shells with controllable cavity diameters using silica spheres as templates for the cavities and the NaBH4 reduction method. The decreased cavity size resulted in a hollow shell with an enhanced visible-light absorption and improved photocatalytic performance. Moreover, we demonstrated that this cavity can be combined with gold nanoparticles (AuNPs) to form AuNPs@black TiO2 yolk-shells. The AuNPs provided additional visible light absorption and promoted the separation of photogenerated carriers in the yolk-shell structures. This further improved the photocatalysis, the degradation rate of Cr(VI) can reach 0.066 min-1. Our work evaluated the effect of the cavity size on the photocatalytic performance of hollow and yolk-shell structures and provided concepts for the further enhancement of visible-light photocatalysis.
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Wang X, Ma S, Liu B, Wang S, Huang W. Imperfect makes perfect: defect engineering of photoelectrodes towards efficient photoelectrochemical water splitting. Chem Commun (Camb) 2023; 59:10044-10066. [PMID: 37551587 DOI: 10.1039/d3cc02843g] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/09/2023]
Abstract
Photoelectrochemical (PEC) water splitting for hydrogen evolution has been considered as a promising technology to solve the energy and environmental issues. However, the solar-to-hydrogen (STH) conversion efficiencies of current PEC systems are far from meeting the commercial demand (10%) due to the lack of efficient photoelectrode materials. The recent rapid development of defect engineering of photoelectrodes has significantly improved the PEC performance, which is expected to break through the bottleneck of low STH efficiency. In this review, the category and the construction methods of different defects in photoelectrode materials are summarized. Based on the in-depth summary and analysis of existing reports, the PEC performance enhancement mechanism of defect engineering is critically discussed in terms of light absorption, carrier separation and transport, and surface redox reactions. Finally, the application prospects and challenges of defect engineering for PEC water splitting are presented, and the future research directions in this field are also proposed.
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Affiliation(s)
- Xin Wang
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, 127 West Youyi Road, Xi'an 710072, China.
| | - Siqing Ma
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, 127 West Youyi Road, Xi'an 710072, China.
| | - Boyan Liu
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, 127 West Youyi Road, Xi'an 710072, China.
| | - Songcan Wang
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, 127 West Youyi Road, Xi'an 710072, China.
| | - Wei Huang
- Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, 127 West Youyi Road, Xi'an 710072, China.
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Noureen L, Wang Q, Humayun M, Shah WA, Xu Q, Wang X. Recent advances in structural engineering of photocatalysts for environmental remediation. ENVIRONMENTAL RESEARCH 2023; 219:115084. [PMID: 36535396 DOI: 10.1016/j.envres.2022.115084] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 12/07/2022] [Accepted: 12/14/2022] [Indexed: 06/17/2023]
Abstract
Photocatalysis appears to be an appealing approach for environmental remediation including pollutants degradation in water, air, and/or soil, due to the utilization of renewable and sustainable source of energy, i.e., solar energy. However, their broad applications remain lagging due to the challenges in pollutant degradation efficiency, large-scale catalyst production, and stability. In recent decades, massive efforts have been devoted to advance the photocatalysis technology for improved environmental remediation. In this review, the latest progress in this aspect is overviewed, particularly, the strategies for improved light sensitivity, charge separation, and hybrid approaches. We also emphasize the low efficiency and poor stability issues with the current photocatalytic systems. Finally, we provide future suggestions to further enhance the photocatalyst performance and lower its large-scale production cost. This review aims to provide valuable insights into the fundamental science and technical engineering of photocatalysis in environmental remediation.
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Affiliation(s)
- Laila Noureen
- School of Environment and Energy, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
| | - Qian Wang
- School of Advanced Materials, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
| | - Muhammad Humayun
- School of Optical and Electronics Information, Wuhan National Laboratory for Optoelectronic, Huazhong University of Science and Technology, Wuhan, 430074, China
| | | | - Qiyong Xu
- School of Environment and Energy, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China.
| | - Xinwei Wang
- School of Advanced Materials, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China.
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Ma X, Hao K, Dai Y, Song L, Yu Q, Yin X, Wang Z. Enhanced Visible‐Light Photocatalytic Activity by the Comprehensive Effects of Mesoporous and N‐Doping at the Meso‐N‐TiO
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Nanocatalysts. ChemistrySelect 2021. [DOI: 10.1002/slct.202101243] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Xiuqiang Ma
- College of Materials Science and Engineering Shandong University of Science and Technology Qingdao 266590 China
| | - Kun Hao
- College of Materials Science and Engineering Shandong University of Science and Technology Qingdao 266590 China
| | - Yalu Dai
- College of Materials Science and Engineering Shandong University of Science and Technology Qingdao 266590 China
| | - Liang Song
- College of Materials Science and Engineering Shandong University of Science and Technology Qingdao 266590 China
| | - Qing Yu
- College of Materials Science and Engineering Shandong University of Science and Technology Qingdao 266590 China
| | - Xunqian Yin
- College of Materials Science and Engineering Shandong University of Science and Technology Qingdao 266590 China
| | - Zhongwei Wang
- College of Materials Science and Engineering Shandong University of Science and Technology Qingdao 266590 China
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Ouyang L, Zhang Y, Wang Y, Wang X, Yuan S. Insights into the Adsorption and Photocatalytic Oxidation Behaviors of Boron-Doped TiO 2/g-C 3N 4 Nanocomposites toward As(III) in Aqueous Solution. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c00509] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Like Ouyang
- Low-carbon Technology & Chemical Reaction Engineering Lab, College of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Yan Zhang
- Low-carbon Technology & Chemical Reaction Engineering Lab, College of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Yuan Wang
- Low-carbon Technology & Chemical Reaction Engineering Lab, College of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Xinlong Wang
- Low-carbon Technology & Chemical Reaction Engineering Lab, College of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Shaojun Yuan
- Low-carbon Technology & Chemical Reaction Engineering Lab, College of Chemical Engineering, Sichuan University, Chengdu 610065, China
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