DALTON TRANSACTIONS
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2020
·Vol. 50
·期 5
·1780-1787
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IF 4.174
Tingting Wei,Zhanbin Jin,Fengyan Li,Zhixia Sun,Lin Xu
Efficient solar-powered water oxidation over BiVO4-based anodes requires coupling photoactive semiconductors to improve inferior activity and stability. Herein, we examine how functionalization with coated tungsten trioxide WO3 affects the photoelectrocatalytic performance of TaON–BiVO4 photoanodes prepared by the doctor-blade method. The effects of the formation of the particularly-porous microstructure and PEC performance of the resulting anodes are explored. Significant enhancements were achieved in water oxidation photocurrent densities at 1.23 V (vs. RHE) with the use of TaON–BiVO4/WO3 photoanodes compared to unmodified TaON–BiVO4. All the composites and photoanodes were studied via numerous characterization methods. Besides, the formation process and probable transfer mechanism of photoinduced carriers were also investigated in detail.
研究领域:
材料科学
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可再生能源
·
电化学
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DOI
高影响因子
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
·
2019
·Vol. 19
·期 1
·80-87
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IF 2.408
Tingting Wei,Zhanbin Jin,Fengyan Li,Dandan Yan,Lin Xu
In this work, a series of samples of Cd0.5Zn0.5S (ZCS) nanoparticles decorated with porous TaON were successfully prepared as a direct Z-scheme system. The photocatalytic evolution of H2 with a high efficiency was explored using NiS decorated with TaON sensitized ZCS nanocomposites (NiS-TaON/ZCS) and Na2SO3/Na2S as sacrificial reagents. The results showed that 0.5 wt% NiS deposited on the surface of 4 wt% TaON-ZCS nanocomposites could reach the highest photocatalytic H2 evolution rate of 34.8 mmol h−1 g−1 with a maximum quantum yield of about 25.5% under 420 nm monochromatic light. The activity of the TaON-ZCS photocatalyst for photocatalytic H2 evolution is higher than that of either pure ZCS or TaON. This high photocatalytic performance is ascribed firstly to the hierarchical structure of the coupled semiconductor system and secondly to the efficient transfer and separation of photogenerated charge carriers with NiS as a cocatalyst, which could serve as an electron collector.
研究领域:
材料科学
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能源科学
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化学工程
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DOI
高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 151
·期 6
·1728-1737
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IF 2.482
Huang Huiting,Shen Lijuan,Yang Shuai,Hu Wenjian,Zhang Lili,Feng Jianyong,Jiang Lilong,Yu Tao,Li Zhaosheng,Zou Zhigang
Abstract In addition to traditional metal oxides, N-containing compound would become efficient catalyst for H 2 S selective oxidation. TaON and Ta 3 N 5 , taking as examples, with porous structure are able to selectively oxidize H 2 S into sulfur. TaON exhibits ca. 99% H 2 S conversion and ca. 89% sulfur selectivity at 250 ℃, while Ta 3 N 5 exhibits near complete H 2 S conversion (~ 100%) and 86% sulfur selectivity at 250 ℃. TaON of lower N content shows higher sulfur selectivity (~ 90–100%) above 130 ℃, compared with that (~ 86–95%) over Ta 3 N 5 . Whereas, Ta 3 N 5 of higher N content demonstrates higher H 2 S conversion (~ 30–40%) below 160 ℃, compared with that (~ 6–30%) over TaON. Temperature programmed desorption results show that Ta 3 N 5 owns larger amount of acid sites and weaker basic sites than TaON. Over Ta 3 N 5 , the reactant molecules could dissociatively adsorb on acid sites more frequently and could be easier to move across the weaker basic sites, thus increasing probability for reaction at low temperature. Manipulating both cations and anions in N-containing compound can alter surface property for optimization of selective H 2 S oxidation. Graphic Abstract
研究领域:
催化化学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Zhongliang Li,Lili Cao,Ting Yang,Jinwei He,Zelin Wang,Jinlu He,Yan Zhao,Zhanli Chai
Developing carbon-supported Pt-based electrocatalysts with high activity and long-durability for the oxygen reduction reaction (ORR) is an enormous challenge for their commercial applications due to the corrosion of carbon supports in acid/alkaline solution at high potential. In this work, a Janus structural TaON/graphene-like carbon (GLC) was synthesized via an in-situ molecular selfassembly strategy, which was used as a dual-carrier for platinum (Pt). The as-obtained Pt/TaON/GLC presents high half-wave potential (0.94 V vs. RHE), excellent mass (1.48 A mg Pt -1 ) and specific (1.75 mA cm Pt -2 ) activities at 0.9 V, and superior long-term durability with a minimal loss (8.0 %) of mass activity after 10,000 cycles in alkaline solution, outperforming those of Pt/C and other catalysts. The structural characterizations and density functional theory (DFT) calculations indicate that the Pt/TaON/GLC catalyst exhibits the maximum synergies, including enhanced interfacial electron density, improved charge transfer, enhanced O 2 adsorption, and superimposed O O cleavage. This work shows a potential strategy for preparing the high-active and long-durable Pt-based electrocatalyst by synergism-promoted interface engineering.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
Energy & Environmental Science
·
2013
·Vol. 6
·期 7
·2134-2144
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IF 11.653
Zheng Wang,Jungang Hou,Chao Yang,Shuqiang Jiao,Kai Huang,Hongmin Zhu
Hierarchical tantalum-based oxide and (oxy)nitride with hollow urchin-like nanostructures have been synthesized for the first time by an in situ self-assembly wet-chemical route in addition with post-thermal nitridation. Notably, a single-phase metastable γ-TaON with hollow urchin-like spheres among the tantalum (oxy)nitrides was obtained during the phase transformation process from an orthorhombic Ta2O5 to a typical monoclinic β-TaON, corresponding the order of phase formation: Ta2O5 → γ-TaON → β-TaON → Ta3N5. The combined effect of the crystal and electronic structures and hierarchical morphology on the tunable photocatalytic and photoelectrochemical performances of the tantalum-based photocatalysts was systematically investigated. Efficient photocatalytic hydrogen production as high as 381.6 μmol h−1 with an apparent quantum efficiency of 9.5% under 420 nm irradiation (about 47.5 times higher than that of the conventional TaON) was achieved over this metastable γ-TaON architecture. Furthermore, the hierarchical γ-TaON photoanode exhibited a photocurrent density of ∼1.4 mA cm−2 at 0.8 V vs. SCE in Na2SO4 solution under visible light irradiation. This excellent photocatalytic activity is ascribed to the unique urchin-like nanostructure with large specific surface area, the metastable crystal structure and appropriate electronic structure as well as the efficient charge carrier separation.
研究领域:
材料科学
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光催化
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DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2019
·Vol. 91
·期 1
·82-91
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IF 1.986
An Lin,Han Xin,Li Yaogang,Hou Chengyi,Wang Hongzhi,Zhang Qinghong
Abstract In recent years, tantalum oxynitride (TaON) semiconductor as one of the most efficient photocatalysts has been studied intensively owing to the appropriate potentials for overall solar water splitting. In this work, ZnS/CdS/γ-TaON composite photocatalysts with wide light response were successfully prepared by nitridation of Ta 2 O 5 at 800 °C in a wet NH 3 flowing and subsequently deposition CdS and ZnS quantum dots. The powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–vis diffuse reflection spectroscopy (DRS), N 2 adsorption–desorption isothermals, X-ray photoelectron spectroscopy (XPS), and so on. The photocatalytic property for hydrogen production was also studied. The results indicated that CdS and ZnS quantum dots with a diameter of 3–8 nm were uniformly dispersed on the surface of γ-TaON, which enlarged the spectral response of the ZnS/CdS/γ-TaON photocatalysts. And the optimized H 2 evolution rate of ZnS/CdS/γ-TaON composite (839.6 μmol h −1 g −1 ) is about 14 times higher than that of CdS/γ-TaON in the absence of any noble-metal cocatalyst and 47 times higher than that of Pt loaded γ-TaON sample. The enhanced photocatalytic activity is attributed to the higher separation efficiency of electrons and holes with the heterogeneous junction between ZnS, CdS, and γ-TaON. Besides, the presence of γ-TaON and ZnS also prevent the photocorrosion of CdS. The results provide a new insight for developing the TaON-based nanocomposite photocatalysts with enhanced stability and excellent photocatalytic H 2 production activity.
研究领域:
材料科学
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光催化技术
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能源转换与储存
✓ 已验证
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2022
·
IF 7.305
Dandan Yan,Min Li
It is of great significance for designing prospective composite phase change materials (PCMs) with high shape-stabilized property, good thermal conductivity and efficient energy storage and conversion capacity. This study successfully developed a novel composite PCMs that TaON nanoparticles doped polyethylene glycol/metal-organic frameworks (PEG/MOFs) using a convenient impregnation method. The inherent favorable thermal conductivity of HKUST-1 and the excellent visible light absorption ability of TaON endowed the composite PCMs with remarkably improved thermal conductivity (increased by 126.7% over pure PEG) and remarkable photo-thermal conversion ability (η: 89.9–94.6%). Furthermore, the composite PCMs exhibited not only high shape stability, high thermal energy storage capacity (148.1 J/g) but also outstanding thermal stability and reliability. Accordingly, this novel photothermal composite PCMs would be hopefully applied to efficient storage, management and utilization for solar energy.
研究领域:
材料科学
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能量存储
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纳米技术
·
太阳能技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 15
·7291-7299
·
IF 5.968
Jungang Hou,Zheng Wang,Wenbin Kan,Shuqiang Jiao,Hongmin Zhu,R. V. Kumar
Large-scale hydrogen production through water splitting using photocatalysts with solar energy can potentially produce clean fuel from renewable resources. In this work, photocatalytic evolution of H2 with a high efficiency was achieved using graphene oxide (GO) nanosheets decorated with CdS sensitized TaON core–shell composites (GO–CdS@TaON). The CdS@TaON core–shell nanocomposites were prepared by an ion-exchange route with assistance from a hydrothermal process on GO as the support. The TaON core–shell composites containing 1 wt% CdS nanocrystals showed a high rate of H2-production at 306 μmol h−1 with an apparent quantum efficiency (QE) of 15% under 420 nm monochromatic light. The rate of hydrogen formation was 68 times faster in comparison with the rate observed on pure TaON. The rate was further increased to 633 μmol h−1 with a high quantum efficiency of 31% when the GO–CdS@TaON hybrid composite was coupled with 1 wt% of graphene oxide and 0.4 wt% of Pt (about 141 times higher than that of the pristine TaON). This high photocatalytic H2-production activity is ascribed firstly to the presence of CdS nanocrystals that alter the energy levels of the conduction and valence bands in the coupled semiconductor system; secondly to the involvement of graphene oxide that serves as an electron collector and transporter to efficiently lengthen the lifetime of the photogenerated charge carriers from CdS@TaON composites. This investigation can open up new possibilities for the development of highly efficient TaON-based photocatalysts that utilize visible light as an energy source.
研究领域:
材料化学
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光催化
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能源科学
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纳米材料
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半导体物理
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可再生能源
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DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
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2012
·Vol. 22
·期 41
·21972-21978
·
IF 5.968
Zheng Wang,Jungang Hou,Shuqiang Jiao,Kai Huang,Hongmin Zhu
Photocatalytic oxygen evolution with a high efficiency was achieved using tantalum nitride (Ta3N5) quantum dots (QDs) coupled TaON hollow spheres (Ta3N5–TaON). TaON hollow spheres coupled with the surface enriched Ta3N5 QDs were prepared by an in situ chemical reduction route in ammonia solution at −45 °C and were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectra, UV-vis diffuse reflectance spectra and photoluminescence spectra. The Ta3N5–TaON composites containing 4 mol% Ta3N5 QDs showed a high rate of O2 production at 208.2 μmol h−1 with an apparent quantum efficiency of 67% under 420 nm light. The rate of oxygen formation of the Ta3N5–TaON heterojunction was 3.3 times higher than that of the pristine TaON hollow spheres. Furthermore, relative photoelectrochemical properties of Ta3N5–TaON composite photoelectrodes were investigated. The resulting 4 mol% Ta3N5–TaON heterojunction films exhibited a photocurrent of ca. 2.7 mA cm−2 under visible light irradiation at 1.0 V vs. SCE in Na2SO4 solution. This excellent photocatalytic activity is ascribed to the Ta3N5 QDs that alter the energy levels of the conduction and valence bands in the coupled semiconductor system and the slow recombination of photogenerated electron–hole pairs. Moreover, the Ta3N5–TaON composite exhibited strong durability which could be attributed to the inhibition of Ta3N5 QDs leaching owing to its strong interaction with TaON.
研究领域:
光催化
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材料科学
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能量转换
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半导体异质结构
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太阳能利用
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）