DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 42
·15422-15432
·
IF 4.39
Dong Qiu,Chengli He,Yuxuan Lu,Qiaodan Li,Yang Chen,Xiaoli Cui
Photoelectrochemical water splitting is an excellent strategy for hydrogen generation and it is pivotal to the development of photoanodes with sufficient sunlight harvesting, rapid charge separation, and enhanced electron injection efficiency. In this work, we rationally constructed a γ-graphyne/TiO2 (GY/TiO2) p–n heterojunction in which p-type γ-graphyne nanosheets were distributed in the three-dimensional space surrounding TiO2 nanotube arrays. The GY/TiO2 photoanode achieves a photocurrent density of 0.75 mA cm−2 at 1.23 V (vs. RHE), 1.7 times that of bare TiO2, and extends the electron lifetime of TiO2 from 0.51 to 1.16 ms. The improvement arises from moderate γ-graphyne modification, contributing to broadened light absorption, the suppressed recombination of electron–hole pairs, an increase in charge transfer, and a higher injection efficiency of surface electrons. This work provides a reliable approach for the utilization and conversion of sustainable solar energy.
研究领域:
材料科学
·
能源转换与存储
·
光催化
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产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2021
·Vol. 13
·期 15
·1803-1809
·
IF 2.896
Mingqing Li,Li Li,Boya Li,Liying Zhai,Baohui Wang
The design and construction of a photoelectrochemical (PEC) sensor with excellent photoelectric properties and good photoelectrocatalysis activity is significant for the effective detection of analytes. In this paper, based on a two-step anodic oxidation method and successive ionic layer adsorption (SILAR) method, a TiO2 nanotube array (TNT) photoelectrochemical sensor modified with BiOBr nanosheets was constructed and applied for the detection of H2O2 for the first time. The photocurrent of the photoelectrochemical sensor increases with the increase of the H2O2 concentration under the irradiation of an 8 W UV lamp. Excellent linearity was obtained in the concentration range from 10 nM to 100 μM with a low detection limit of 5 nM (S/N = 3). This excellent photoelectrochemical performance is due to the formation of a p–n heterojunction between BiOBr and TiO2 nanotube arrays, which provides efficient separation of charge carriers and accelerates electron transport. Moreover, it is applied to detect H2O2 in milk samples and it showed a good recovery result ranging from 95.73% to 105.65%, which provides a promising new strategy for the detection of H2O2.
研究领域:
材料科学
·
分析化学
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DOI
PubMed
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Ling Gan,Yifan Wu,Haiou Song,Chang Lu,Shupeng Zhang,Aimin Li
Self-doped TiO 2 nanotube arrays (DNTA) were prepared for the electrooxidation of resistant organics. The anatase TiO 2 NTAs had an improved carrier density and conductivity from Ti 3+ doping, and the oxygen-evolution potential remained at a high value of 2.48 V versus the standard hydrogen electrode, and thus, achieved a highly enhanced removal efficiency of phenol. The second anodization could stabilize Ti 3+ and improve the performance by removing surface TiO 2 particles. Improper preparation parameters (i.e., a short anodization time, a high calcination temperature and cathodization current density) harmed the electrooxidation activity. Although boron-doped diamond (BDD) anodes performed best in removing phenol, DNTA exhibited a higher mineralization of phenol than Pt/Ti and BDD at 120 min because intermediates were oxidized once they are produced with DNTA. Mechanism investigations using reagents such as tert-butanol, oxalic acid , terephthalic acid, and coumarin showed that the DNTA mineralization resulted mainly from surface-bound OH, and the DNTA produced more than twice the amount of OH compared with BDD. The free OH on the BDD electrode was more conducive to initial substrate oxidation, whereas the adsorbed OH on the DNTA electrode mineralized the organics in situ. The preferential removal of p -substituted phenols on DNTA was attributed mainly to their electromigration and the aromatic intermediates that are hydrophobic were beneficial to mineralization.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Rongrong Chen,Yanqi Xu,Xiangli Xie,Cunjun Li,Wenfeng Zhu,Qiankun Xiang,Guangyao Li,Di Wu,Xuemei Li,Linjiang Wang
The corrosion of 304 stainless steel (304SS) is a major global issue in the context of ships and marine engineering constructions. The photocathode anticorrosion system, composed of semiconductor material in the form of photoanode and 304SS in the form of cathode, is an effective method to solve 304SS corrosion of large components. Owing to the rapidly photoinduced charge-transfer at the semiconductor interface that supplies photogenerated electrons to the electrically connected 304SS and shifts the coupled potential to much more negative values, constructing a photoanode heterostructure material promotes charge separation and thus improves the photocathodic anticorrosion of 304SS. Herein, we fabricated TiO 2 nanotubes/nickel‑gallium layered double hydroxide (TiO 2 /NiGa-LDH) heterostructure material by the electrochemical anodization and hydrothermal method for highly-efficient photocathodic anticorrosion of 304SS. Owing to the modulated band structure and enhanced photogenerated carriers separation and transfer, TiO 2 /NiGa-LDH heterostructure material gave rise to largely reduced open circuit potential (OCP, −690 mV), which facilitated the transfer of electrons from the TiO 2 /NiGa-LDH heterostructure material to the 304SS to improve the photocathodic anticorrosion of 304SS, along with good stability after the OCP test for 72 h. This work provides a strategy for exploring LDH-based photoanodes materials toward highly-efficient photocathodic anticorrosion of 304SS.
研究领域:
材料科学
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腐蚀与防护
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电化学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Jinzhe Li,Chuyun Fu,Qiufeng Lin,Tao Zeng,Da Wang,Xinwen Huang,Shuang Song,Cong Li,Feilong Dong
Ferrate (Fe(VI), FeO 4 2- ) has been widely used in the degradation of micropollutants with the advantages of high redox potential , no secondary pollution and inhibition of disinfection byproducts . However, the low transformation of Fe(V) and/or Fe(IV) by Fe(VI) and incomplete mineralization of pollutants limit their application. In this work, we designed a photo electric cell with TiO 2 nanotubes (TNTs) and Pt serving as the anode and cathode to enhance the utilization of Fe(VI) (Fe(VI)-TNTs system). TNTs accelerated the generation of •OH via h VB + oxidation of OH - and photogenerated electrons at Pt boosted the transformation of Fe(VI) to Fe(V) and/or Fe(IV), resulting in a 22.2 % enhancement of chloroquine (CLQ) removal compared to Fe(VI) alone. The results from EPR and quenching tests showed that Fe(VI), Fe(V), Fe(IV), •OH, O 2 •- and h VB + coexisted in the Fe(VI)-TNTs system, among which Fe(V) and Fe(IV) were testified as the primary reactive substances accounting for 59 % of CLQ removal. The performance tests and recycling tests demonstrated that the Fe(VI)-TNTs system maintained excellent performance in an authentic water environment. The plausible degradation pathway of CLQ oxidized in the Fe(VI)-TNTs system was proposed with nine identified oxidation products via N-C cleavage, electrophilic addition and carboxylation processes. Based on the ECOSAR calculation, the constructed reaction system allowed a decrease in acute and chronic toxicity. Our findings provide a highly efficient and cost-effective strategy to enhance Fe(VI) application for micropollutant degradation in the future.
研究领域:
环境科学
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化学工程
·
材料科学
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产品关联
DOI
PubMed
高影响因子
CHINESE CHEMICAL LETTERS
·
2023
·
IF 9.1
Yifen He,Chao Qu,Na Ren,Dawei Liang
ABSTRACT Recently, a novel 2-electron oxygen reduction reaction (ORR) based electro-oxidation (EO) system was developed, which utilizes a H 2 O 2 generation cathode instead of H 2 evolution cathode. A Ti-based Ni-Sb co-doped SnO 2 (Ti/NATO) anode was selected for efficient degradation of refractory organics and O 3 production. The synergistic reaction of O 3 /H 2 O 2 further accelerated the generation of hydroxyl radicals ( • OH) in the ORR-EO system. However, the catalytic activity and long-term effectiveness of the Ti/NATO anode limited the large-scale application of the ORR-EO process. In this study, a blue TiO 2 nanotube array (blue-TiO 2 -NTA) inter-layer was introduced into the fabrication process between the Ti substrate and NATO catalyst layer. Compared to the Ti/NATO anode, the Ti/blue-TiO 2 -NTA/NATO anode achieved higher efficiency of organic removal and O 3 generation. Additionally, the accelerated lifetime of the Ti/blue-TiO 2 -NTA/NATO anode was increased by 7 times compared to the Ti/NATO anode. When combined with CNTs-C/PTFE air cathode in ORR-EO system, all anodic oxidation and O 3 /H 2 O 2 processes achieved higher • OH production. Over 92% of TOC in leachate bio-effluent was effectively eliminated with a relatively low energy cost of 45 kWh/t.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2024
·Vol. 99
·期 4
·978-988
·
IF 2.8
Likai Dai,Zheng Fang,Anxian Peng,Yunhong Chen,Yitong Liu,Huimei Chen,Rongjun Yan,Rencheng Zhou,Mingming Du
BACKGROUND Photothermal catalytic oxidation technology for synthesis of high value-added chemicals has become a hot topic of research at home and abroad. As a special structure, titania (TiO 2 ) nanotubes (Ti-NTs) possess larger specific surface area and adsorption capacity, which have shown great application prospects in photothermal catalytic oxidation. RESULTS In this work, high-performance palladium (Pd-Ti-NTs catalyst were prepared and applied to the photothermal catalytic oxidation of 5-hydroxymethyl (HMF) and benzyl alcohol. The photothermal dependence on catalytic activity and selectivity of HMF and benzyl alcohol oxidation was studied in detail. The results revealed that compared with thermal catalytic oxidation, the catalysts showed significantly higher conversions of both benzyl alcohol and HMF under light. in particular, HMF conversion increase from 55.6% to 99.7%. Aldehyde oxidation is inhibited by alcohol and can be dramatically promoted by light radiation. This is probably because alcohol can inhibit the adsorption of aldehyde, and this inhibiting effect is weakened through light radiation, thus promoting the oxidation of aldehydes. Therefore, the selectivity of the final products 2,5-furandicarboxylic acid (FDCA) and benzoic acid were dramatically increased in both systems under light radiation, and the selectivity for FDCA was obviously increased from 5.8% to 61.3%, and the yield reached 61.0%, which is higher than that of most of the reported Pd-TiO 2 -based catalysts for FDCA. CONCLUSIONS In this paper, we verify that Pd-Ti-NTs could preferentially promote the conversion of aldehydes to acids in the presence of light, and obtained catalysts with high catalytic performance and high stability for benzyl alcohol and HMF oxidation. © 2024 Society of Chemical Industry (SCI).
研究领域:
催化
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材料科学
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化学工程
·
纳米技术
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Qianxilong Wang,Jiakuo Chen,Jiansheng Wang,Xiongfeng Zeng,Ruimin Wang,Yingna Zhao
In this paper, TiO 2 nanotube arrays with gap characteristics were designed and fabricated. Moreover, by adjusting the ratio of metal ions to ligands (1:20), a fully coated Co-MOF/TiO 2 composite photoanode was obtained; Secondly, tests such as XPS and EPR were adopted and combined with theoretical calculations to verify the construction of Type II heterojunctions, which promoted the separation of photogenerated electron-hole pairs and thereby enhanced the cathodic protection effect of the composite photoanode. Finally, to promote green and environmentally friendly anti-corrosion materials, an in-depth study was conducted on the anti-corrosion and anti-pitting effects of composite photoanodes on 304SS with different application areas (1cm 2 ,25cm 2 ,100cm 2 ).
研究领域:
材料科学
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电化学
·
防腐蚀工程
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产品关联
DOI
高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 7
·3277-3282
·
IF 1.821
Qingxiang Zhou,Zhi Fang
Triazine herbicides are effective herbicides, which are widely used all over the world, but their residues pose a great threat to the environment and human health. Thus, it is crucial to develop a rapid and sensitive method for monitoring the triazine concentrations in the environment. The present study establishes a simple, sensitive and reliable method for determination of four triazine herbicides including atrazine, prometryn, propazine and simazine in water samples. Ordered titanium dioxide (TiO2) nanotube arrays were prepared using an anodization method and were then used as the adsorbent in the development of a micro-solid phase extraction for the enrichment of triazine herbicides before analysis using high performance liquid chromatography. The experimental results demonstrated that TiO2 nanotube arrays showed good adsorption of triazine herbicides, and the proposed method had satisfactory sensitivity with limits of detection in the range of 0.19–0.50 μg L−1. The proposed method was validated using four real environmental water samples and spiked recoveries were in the range of 84.3–101.9%. All the results demonstrated that the proposed method was an effective analytical tool and would be a useful method for the determination of such pollutants.
研究领域:
环境科学
·
分析化学
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产品关联
DOI
高影响因子
Scientific Reports
·
2015
·Vol. 5
·期 1
·1-10
·
IF 5.578
Lian Zichao,Wang Wenchao,Xiao Shuning,Li Xin,Cui Yingying,Zhang Dieqing,Li Guisheng,Li Hexing
A plasmonic Ag/TiO 2 photocatalytic composite was designed by selecting Ag quantum dots (Ag QDs) to act as a surface plasmon resonance (SPR) photosensitizer for driving the visible-light driven photoelectrocatalytic hydrogen evolution. Vertically oriented hierarchical TiO 2 nanotube arrays (H-TiO 2 -NTAs) with macroporous structure were prepared through a two-step method based on electrochemical anodization. Subsequently, Ag QDs, with tunable size (1.3-21.0 nm), could be uniformly deposited on the H-TiO 2 NTAs by current pulsing approach. The unique structure of the as-obtained photoelectrodes greatly improved the photoelectric conversion efficiency. The as-obtained Ag/H-TiO 2 -NTAs exhibited strong visible-light absorption capability, high photocurrent density and enhanced photoelectrocatalytic (PEC) activity toward photoelectrocatalytic hydrogen evolution under visible-light irradiation (λ > 420 nm). The enhancement in the photoelectric conversion efficiency and activity was ascribed to the synergistic effects of silver and the unique hierarchical structures of TiO 2 nanotube arrays, strong SPR effect and anti-shielding effect of ultrafine Ag QDs.
研究领域:
材料科学
·
能源科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Lijia Wang,Wenhong Gu,Pengtao Sheng,Zhiwei Zhang,Bing Zhang,Qingyun Cai
CdS/CuInS 2 /Au/TiO 2 nanotube arrays (NTAs) were fabricated by deposition and dipping technique as well as successive ionic layer adsorption and reaction method, where Au nanoparticles were used to improve the interfacial electron transfer and quantum dots (QDs) of CdS and CuInS 2 (4.1 nm) to stimulate the formation of an ideal stepwise band edge structure with TiO 2 . High and stable photocurrent responses were observed on the NTA electrode. A photoelectrochemical aptasensor toward cytochrome c (cyt c) was then fabricated by immobilization of HS-aptamer on the NTAs via Cd-S bond and Cu-S bond. Sensitive and selective detection of cyt c was achieved with a detection range of 5 pM to 100 nM.
研究领域:
生物化学
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分析化学
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纳米材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2020
·Vol. 6
·期 12
·1250h9
·
IF 1.929
Weiting Qi,Ning Wang,Xingyu Chen,Hongyan Liang
The partially reduced TiO2 nanotube arrays (R-TNTs) has been extensively investigated for photoelectrochemical (PEC) water splitting. However, the severe charge recombination and limited light harvesting hinder their photocurrent output. Herein, we present a strategy for prepared R-TNTs photoanode which can facilitate the charge separation and transfer simultaneously via formation of homojunction induced by the Ti3+ self-doping and oxygen vacancies. Additionally, we deposited plasmonic Au nanoparticles on the R-TNTs surface to extend the light absorption in visible region and accelerate the charge transfer at the solid-liquid interface via plasmonic effect. As a result, in PEC water splitting experiments, the optimized Au modified R-TNTs (Au@R-TNTs) photoanode exhibits a photocurrent density of 1.64 mA·cm−2 with solar-to-hydrogen conversion efficiency up to 0.55% under AM 1.5 G illumination, 4-fold and 2-fold higher than that of the pristine TNTs, respectively. The photocatalytic activity in the visible region was dramatically improved. The exploration of interfacial carrier dynamics in homojuntion and the investigation of the synergistic effects of plasmonic enhanced photocatalyst provides guideline for designing solar energy harvesting devices.
研究领域:
材料科学
·
能源科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）