JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
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IF 3.014
Kai Wan,Fang Wu,Yuanyao Dou,Liang Fang,Caiying Mao
Hexagonal Bi 2 Te 3 nanosheets with uniform morphology were facilely synthesized through a hydrothermal method at 180 °C. X ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and selected area electron diffraction (SAED) were employed to characterize the Bi 2 Te 3 nanosheets . The results clearly indicate that uniform Bi 2 Te 3 nanosheets with a side length of 300–400 nm were obtained. Bi 2 Te 3 nanosheet/ZnO nanoparticle (Bi 2 Te 3 NS/ZnO NP) composite photoanodes were fabricated with Bi 2 Te 3 NS concentration in the range of 0–0.25 at.%. The effect of Bi 2 Te 3 NS contents in composite photoanode on the performance of dye-sensitized solar cells (DSSCs) was systematically investigated. The photocurrent density-voltage ( J-V ) characteristics indicate that the DSSCs with Bi 2 Te 3 NS/ZnO NP composite photoanode exhibit significantly improved photovoltaic performance . Typically, the highest energy conversion efficiency of 4.10% which is increased by 46.95% compared with that of the bare ZnO can be achieved in the DSSC with 0.15 at.% Bi 2 Te 3 NS embedding. The EIS results further confirm that a moderate amount of Bi 2 Te 3 NS in photoanode could not only improve the electrons transport and suppress the charge recombination rate, but also enhance the electron collection efficiency. Furthermore, the excellent thermoelectric performance of Bi 2 Te 3 NS in the photoanode could greatly increase the electron density and lower the temperature of the DSSCs effectively. All these results suggest that the Bi 2 Te 3 NS/ZnO NP composite photoanode could highly enhance the performance of the DSSCs.
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高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Ling Li,Ningqiang Shi,Xiangqian Jiang,Weiping Chen,Chuncheng Ban,Jiandong Hao
Energy recovery and reuse, industrial waste heat, and thermal energy recovery and conversion in emerging electronic devices are topics of widespread interest. Flexible composite thermoelectric (TE) films have become the key to TE conversion, and many studies and synthesis methods related to them have made great progress. However, little research has been performed on the corresponding composites of typical TE materials with low-dimensional nanotubular materials, particularly modulation of the overall TE properties using doped low-dimensional nanotubular materials. In this work, high-quality bismuth telluride (Bi2Te3) nanowires and boron nitride nanotubes (BNNTs) were prepared using electrolytic deposition and high-temperature catalytic deposition, respectively. Bi2Te3–BNNTs composite films were prepared using a solvent hot pressing method. The Bi2Te3–BNNTs composite film conductivity reached 179.6 S/cm at room temperature (300 K), the corresponding Seebeck coefficient was 171.4 μV/K, and the power factor (PF) was 52.8 nW/mK2. Carbon doping of BNNTs resulted in carbon–boron nitride nanotubes (BCNNTs), and Bi2Te3–BNNTs composite films were prepared. The Bi2Te3–BCNNTs composite films obtained a conductivity of 4629.6 S/cm, at room temperature (300 K), a corresponding Seebeck coefficient of 181.2 μV/K, and a PF of 1520.0 nW/mK2. This study has important reference value for the application of TE conversion. Moreover, the electrical conductivity decreased by no more than 10% after 400 cycles of bending tests, and the electrical conductivity showed signs of recovery after repressing thermally, which undoubtedly proves that Bi2Te3–BCNNTs composite films have good flexibility and thermal stability, and this has contributed to the application and promotion of flexible thermoelectric materials.
研究领域:
材料科学
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能源工程
·
纳米技术
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DOI
PubMed
高影响因子
Materials Today Physics
·
2024
·
IF 10
Jingwen Pan,Chenchen Zhao,Dongbo Wang,Jiamu Cao,Bingke Zhang,Donghao Liu,Sihang Liu,Zhi Zeng,Tianyuan Chen,Gang Liu,Shujie Jiao,Zhikun Xu,Xuan Fang,Liancheng Zhao,Jinzhong Wang
Photothermal co-catalysis with the partial conversion of solar energy to thermal energy has the potential to overcome the current bottleneck of realizing efficient photocatalytic hydrogen production with zero artificial energy consumption. However, it is still challenging to design highly efficient photocatalysts that can make use of light and thermal energy synergistically. In this work, we successfully improved the photothermal effect and visible-light-catalyzed hydrogen evolution performance by constructing a novel heterojunction based on the topological insulator Bi 2 Te 3 and graphene oxide (GO) synergistically modified with Zn 0.67 Cd 0.33 S. The photocatalytic hydrogen evolution rate of the 1.1 wt% Bi 2 Te 3 @0.05% GO@Zn 0.67 Cd 0.33 S heterojunctions reached 11.52 mmol/h/g (Apparent Quantum Yield of 21.7%), which was 12.9 times higher than that of pure Zn 0.67 Cd 0.33 S. Furthermore, the hydrogen production rate reached 71.79 mmol/h/g without cooling. The improved photocatalytic activity originated from the synergistic enhancement of visible-light absorption and the systematic enhancement of the photothermal effect by the Bi 2 Te 3 and GO. In addition, the high electrical conductivity of Bi 2 Te 3 and the high proton conductivity of GO not only increased the electron transfer rate but also synergistically mediated the acceleration of the hydrogen generation reaction. A strong built-in electric field is formed between Bi 2 Te 3 and Zn 0.67 Cd 0.33 S, which greatly facilitates the efficient separation of photogenerated carriers . The obtained results illustrate a promising strategy for the development of efficient new photothermal catalysts.
研究领域:
材料科学
·
能源科学
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高影响因子
Materials Today Nano
·
2026
·
IF 7.6
Wen He,Duoduo Ling,Yanghao Bi,Dongbo Wang,Lei Chen,Yinze Zhang,Qiudan Geng,Ali Raza,Yiming Zhao,Sihan Zhang,Xiaoxue Yu,Bangsheng Li,Lianshe Fu,Jinzhong Wang
Electron beam evaporation and post-annealing enable low-cost, high-quality Bi 2 Te 3 /GaN heterojunction fabrication. • The Bi 2 Te 3 /GaN photodetector achieves a specific detectivity of 2.01 × 10 12 Jones at 0 V. • Built-in field of heterojunction separates photogenerated carriers for self-powered UV-NIR detection. • This device is used as a single-pixel sensor and achieves high-quality multi-wavelength imaging. Self-powered broadband photodetectors are critical for energy-efficient optoelectronics in the Internet of Things, environmental sensing, and wearable imaging, yet achieving broadband response with high specific detectivity in a device through a scalable fabrication method remains a major challenge. In this work, we report a Bi 2 Te 3 /GaN heterojunctionphotodetector that integrates narrow- and wide-bandgap semiconductors to realize self-powered operation from ultraviolet to near infrared region. The Bi 2 Te 3 /GaN heterostructure is fabricated by depositing a homogeneous Bi 2 Te 3 film with high crystallinity on a GaN substrate through the electron beam evaporation method followed by a post-annealing. Without any external bias, the photodetector exhibits a broadband specific detectivity above 10 9 Jones and a fast response lower than 100 m s in the 367-850 nm spectral range, attributed to efficient photogenerated carrier separation across the heterojunctiondue to the built-in electric field at the interface. Under 367 nm light irradiation, the device achieves a responsivity of 80.39 mA/W and a specific detectivity of 2.01 × 10 12 Jones. The device also demonstrates excellent cycling durability, maintaining stable photoresponse over 100 cycles at 638 nm illumination, and supports high-resolution and multi-wavelength imaging. This work provides a cost-effective, scalable strategy for constructing Bi 2 Te 3 /GaN heterojunctions and highlights the potential of Bi 2 Te 3 -based detectors for next-generation self-powered broadband photodetection technologies. Download: Download high-res image (369KB) Download: Download full-size image
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Shuang Xia,Yuanyuan Bai,Ju Bai,Shen Yuan,Shengzhao Li,Ting Zhang,Tie Li
Flexible sensors that interface the physical world with digital intelligence have faced a trade-off among sensing accuracy, response selectivity, and signal decoupling. This key challenge arises from the design of high-performance sensitive materials. In this study, a dual-mode flexible sensor is assembled by a new-style dual-gradient HEC-CNT/Bi 2 Te 3 nanowire aerogel prepared via the synchronous processes of directional freeze casting and gravity-induced self-sedimentation. This cooperative top-to-bottom pore-size and bottom-to-up compositional dual-gradient architecture enables the effective spatial partitioning of pressure and temperature sensing behaviors via generating two independent response patterns for piezoresistive and thermoelectric mechanisms, respectively. As a result, the derived device possesses the ultra-low pressure and temperature detection limit/resolution of 5 Pa/2 Pa (sensitivity of −7.97% kPa −1 ) and 0.1 K/0.1 K (Seebeck coefficient of −20.79 µV K −1 ) without any mutual interference, respectively, which is perfectly superior to that of a non-gradient device. Furtherly, this capability of the device is leveraged for robust pattern recognition and predictive analytics, achieving the ultrahigh identification accuracies of 100% and 97% for the effective warning capacities of battery thermal runaway and skin inflammation stages via using the latest convolutional neural network algorithm with transfer learning, respectively. This dual-gradient strategy establishes a feasible design paradigm for high-precision multimodal perception.
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高影响因子
Nanoscale
·
2020
·Vol. 12
·期 30
·16208-16214
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IF 6.895
Qingtao Wang,Kai Cui,Jian Li,Yanxia Wu,Yaoxia Yang,Xiaozhong Zhou,Guofu Ma,Zhiwang Yang,Ziqiang Lei,Shufang Ren
The introduction of defects can enhance the active sites on transition metal dichalcogenides, which can cause changes in crystal structures, and then lead to a change in the original catalytic performance. Herein, an efficient method of introducing defects was reported. In this method, high-energy iron ions were irradiated on the surface of Bi2Te3 nanosheets by ion irradiation technology, which resulted in the generation of a variety of defects. Compared to the original Bi2Te3 nanosheets, the Bi2Te3 nanosheets irradiated by iron ions showed significant improvement in the hydrogen evolution reaction performance in acidic solution. After the iron ion irradiation, the electric double layer capacitance of the Bi2Te3 nanosheets increased significantly, which indicated an increase in the number of active sites on the surface of Bi2Te3. Analysis of high-resolution transmission electron microscopy images reveals the occurrence of various defects on the surface of Bi2Te3 after the iron ion irradiation, which increased the active sites. Moreover, the conductivity of the iron ion-irradiated Bi2Te3 nanosheets was also significantly improved. It is noteworthy that iron ion irradiation changed the characteristic of the Bi2Te3 surface from hydrophobic to hydrophilic, which facilitated the release of hydrogen bubbles from the catalyst surface and exposed the active sites in time. At the same time, the damage caused by the large bubbles to the electrode material could be avoided, and the stability of the material was improved. This efficient iron ion irradiation method provides an innovative idea for the design of other high-efficient catalysts.
研究领域:
材料科学
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催化化学
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PubMed
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Huaiyin Liu,Penglun Zheng,Jingmin Cai,Bo Zhu,Weibin Xu,Yun Zheng
Low-temperature liquid phase sintering (LPS) has proven to be cost effective in preparing Bi2Te3-based pellets with promising thermoelectric properties. The previous work explored deionized water as the transient liquid phase with a low boiling point (100 °C), making it challenging to produce densified pellets at high temperatures. In this work, we opted for an ethylene glycol (EG) solution with a higher boiling point (∼200 °C) as the liquid phase. The EG solution serves as a suitable alternative and enhances the electrical conductivity and power factor of n-type Bi2Te2.7Se0.3 (BTS) materials. Moreover, the BTS samples were heat treated to assess the effectiveness in increasing the ZT value. The BTS samples subjected to LPS with 3% EG addition and followed by a heat treatment at 300 °C exhibited a power factor of 1056 μW/mK2. A lattice thermal conductivity of 0.69 W/mK was achieved at room temperature, originating from enhanced phonon scattering by enriched grain boundaries and other crystal defects. These samples demonstrate a maximum ZT value of 0.43 at 381 K, ∼72% improvement over the deionized water-treated samples (ZTmax = 0.25). The findings highlight the significance of liquid phase selection and heat treatment in optimizing the thermoelectric properties of the BTS materials.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yang-Wei Wang,Yu Wang,Hao Liang,Yi-Xin Zhang,Jing Feng,Zhen-Hua Ge
Bismuth telluride-based materials has been applied in thermoelectric cooling wildly, but the properties still can be further enhanced by doping, microstructure controlling and compositing strategies. Herein, we demonstrate an anomalous doping strategy in (Bi, Sb) 2 Te 3 (BST) materials, where the strong n type dopant of PbBr 2 acts as p-type dopant, introducing holes in BST materials. The anomalous doping is attributed to the dissolution of Pb and Br elements into the matrix in a non-stoichiometric ratio, with Pb predominantly occupying Sb vacancies and Br enriching the in-situ generated Sb 2 O 3 , resulting in the increased hole concentration and improved electrical conductivity. The maximum power factor (PF) ultimately increases to 3972 μW m −1 K −2 for the 0.3 mol% PbBr 2 doped BST sample. Moreover, the enhanced multi-scale wavelength phonon scattering centers cause the lattice thermal conductivity fall to 0.52 W m −1 K −1 . Finally, the peak ZT is effectively enhanced to 1.3 at 323 K, which is 22 % higher than that of pristine sample. Furthermore, a direct conversion efficiency of 4.6 % is achieved in a single 0.3 mol% PbBr 2 -doped BST leg at a temperature gradient of ΔT = 200 K. Thus, this study underscores the anomalous PbBr 2 doping in Bi 0.42 Sb 1.58 Te 3 , promoting the wider application of BST-based materials.
研究领域:
材料科学
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凝聚态物理
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功能材料
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热电转换
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半导体掺杂
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高影响因子
Journal of Physics-Energy
·
2020
·Vol. 3
·期 1
·014003
·
IF 0
Guanda Zhou,Ting Zhao,Oumin Wang,Xin Xia,Jia Hong Pan
Rutile TiO2 nanorod arrays vertically aligned on conductive fluorine-doped tin oxide glass are optimized for photocatalysis in terms of the density and diameter of nanorods by tuning the concentration of Ti precursor and reaction time during the hydrothermal process. Quantum dots (QDs) of V2VI3( V = Bi; VI = Se, Te) topographic insulators are then employed as sensitizers to enhance the visible-light response of TiO2. Electrochemical measurements show that the decoration of Bi2Se3 or Bi2Te3 significantly increases the photocurrent due to the enhanced light harvesting properties and the charge carrier separation capability mediated by the topographic isolation effect of V2VI3 QDs. Photoelectrocatalytic (PEC) activity evaluation is conducted towards the decoloration of azo dyes, including methyl orange and methylene blue under the sunlight irradiation. The elaborated Bi2Se3/TiO2 nanorod array exhibits the superior PEC performances, presenting shows great potentials in environmental remediation.
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Journal of Materials Chemistry C
·
2025
·
IF 5.1
Zheng Jiang,Shengqiang Cui,Shan Wang,Yajing Wang,Xinxin Wang,Guangmeng You,Xueke Gu,Pengli Si,Gui Yang,Chao Wang
Enhancing phonon scattering has emerged as an effective strategy for suppressing lattice thermal conductivity (κL), thereby improving the performance of bulk thermoelectric materials. Compared with other strategies, the primary purpose of introducing more grain boundaries is to enhance the scattering of mid to low-frequency phonons, consequently reducing the κL at the near-room temperature, which proves advantageous for enhancing the thermoelectric properties of Bismuth telluride-based materials. In this study, MnS/MoS2 as a heterojunction compound was incorporated into a Bi2Te2.7Se0.3 matrix, resulting in the formation of a unique (Bi2Te2.7Se0.3 → MnS → MoS2) three grain boundary interface structure, which significantly enhanced phonon scattering. Additionally, the MnSe secondary phase was observed and confirmed through both X-ray diffraction (XRD) and transmission electron microscopy (TEM). The introduction of 0.3% MnS/MoS2 leads to a reduction in the κL from 0.58 W m−1 K−1 to 0.41 W m−1 K−1 at 300 K. Simultaneously, the synergistic optimization of electrical properties results in a PF of 33 µW cm−1 K−2 at 300 K. Finally, a high ZT value ∼1.17 (375 K) and an average ZTave ∼ 1.08 (300–500 K) were achieved for Bi2Te2.7Se0.3–0.3% MnS/MoS2, which was enhanced 54% and 57% compared with those of the Bi2Te2.7Se0.3 alloy, respectively.
研究领域:
材料科学
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凝聚态物理
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功能材料
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热电转换
·
纳米复合材料
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DOI
高影响因子
Acta Biomaterialia
·
2023
·
IF 9.7
Xinyu Dai,Yiping Liu,Fanrong Meng,Qiqing Li,Fengxia Wu,Jianguo Yuan,Haoran Chen,Huixin Lv,Yanmin Zhou,Yulei Chang
Periodontitis is a biofilm-related disease characterized by damage to the periodontal tissue and the development of systemic diseases. However, treatment of periodontitis remains unsatisfactory, especially with deep-tissue infections. This study describes rationally designed multifunctional photothermocatalytic agents for near-infrared-II light-mediated synergistic antibiofilm treatment, through modification of Lu-Bi 2 Te 3 with Fe 3 O 4 and poly(ethylene glycol)-b-poly(l-arginine) (PEG- b -PArg). Notably, 1064-nm laser irradiation led to photothermal/thermocatalytic effects, resulting in the synergistic generation of reactive oxygen species (ROS) and reactive nitrogen species (RNS) and consequent damage to the biofilm. This treatment was based on the thermoelectric and photothermal conversion properties of Lu-Bi 2 Te 3 , the peroxidase-like catalytic capacity of Fe 3 O 4 , and the guanidinium polymer, PEG- b -PArg. Oxidative damage to biofilm was further enhanced by H 2 O 2 , resulting in the effective elimination of biofilm both in vitro and in vivo. These findings suggest that this synergistic therapeutic strategy is effective for the clinical treatment of periodontitis. Statement of Significance : The current treatment for periodontitis involves time-consuming and labor-intensive clinical scaling of the teeth. The present study is the first to assess the efficacy of a photothermal catalyst for periodontitis treatment. This used near-infrared-II light at 1064 nm to induce oxidative damage in the biofilm, resulting in its degradation. The synergistic photothermal/thermoelectric effect produced deep tissue penetration and was well tolerated, and can kill the biofilm formed by periodontitis pathogens up to 5 orders of magnitude, effectively treating the biofilm-induced periodontitis.
研究领域:
牙科学
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材料科学
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生物医学工程
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纳米技术
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xin Guo,Cunyin Zhang,Zhongyuan Liu,Pan He,Robert Szczęsny,Fangjun Jin,Wanqiang Liu,Duncan H. Gregory
Improvements in the thermoelectric performance of n-type Bi2Te3 materials to more closely match their p-type counterparts are critical to promote the continued development of bismuth telluride thermoelectric devices. Here the unconventional heteroatom dopant, niobium, has been employed as a donor in Bi2Te3. Nb substitutes for Bi in the rhombohedral Bi2Te3 structure and exhibits multiple roles in its modulation of electrical transport and defect-induced phonon scattering. The carrier concentration is significantly increased as electrons are afforded by aliovalent doping and formation of vacancies on the Te sites. In addition, incorporation of Nb in the pseudoternary Bi2–xNbxTe3−δ system increases the effective mass, m*, which is consistent with cases of “conventional” elemental doping in Bi2Te3. Lastly, inclusion of Nb induces both point and extended defects (tellurium vacancies and dislocations, respectively), enhancing phonon scattering and reducing the thermal conductivity. As a result, an optimum zT of 0.94 was achieved in n-type Bi0.92Nb0.08Te3 at 505 K, which is dramatically higher than an equivalent undoped Bi2Te3 sample. This study suggests not only that is Nb an exciting and novel electron dopant for the Bi2Te3 system but also that unconventional dopants might be utilized with similar effects in other chalcogenide thermoelectrics.
研究领域:
材料科学
·
热电材料
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固态化学
·
缺陷工程
·
能源材料
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高影响因子
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