ORGANIC ELECTRONICS
·
2018
·
IF 3.68
Qiufeng Meng,Qinglin Jiang,Kefeng Cai,Lidong Chen
PEDOT:PSS coated Te (PC Te) nanorod/PEDOT:PSS composite films were prepared by a drop-casting technique. H 2 SO 4 treatment was employed to enhance thermoelectric (TE) properties of the composite films. The addition of PC Te nanorods increased both the electrical conductivity and the Seebeck coefficient of the composite films. An optimized power factor of 141.9 μW/mK 2 was obtained for the film containing 90 wt% PC Te nanorods treated with 12 M H 2 SO 4 at room temperature , which was 2.75 times as high as that of the untreated composite film, corresponding to the electrical conductivity and Seebeck coefficient of 204.6 S/cm and 83.27 μV/K, respectively. XPS and GIWAXS analysis revealed the removal of insulating PSS units and the rearrangement of PEDOT chains after the H 2 SO 4 treatment. Finally, a 9-leg TE generator prototype was fabricated using the optimized composite film. The maximum output power and area output power density produced from the prototype were 47.7 nW and 57.2 μW/cm 2 , respectively, at the temperature difference of 40 K.
研究领域:
材料科学
·
物理化学
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DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
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2016
·Vol. 18
·期 12
·1-9
·
IF 2.101
Song Haijun,Cai Kefeng,Shen Shirley
Firstly, tellurium (Te) nanorods with a high Seebeck coefficient have been integrated into a conducting polymer PEDOT/PSS to form PEDOT/PSS/Te composite films. The Seebeck coefficient of the PEDOT/PSS/Te (90 wt.%) composite films is ~191 μV/K, which is about 13 times greater than that of pristine PEDOT/PSS. Then, H 2 SO 4 treatment has been used to further tune the thermoelectric properties of the composite films by adjusting the doping level and increasing the carrier concentration. After the acid treatment, the electrical conductivity of the composite films has increased from 0.22 to 1613 S/cm due to the removal of insulating PSS and the structural rearrangement of PEDOT. An optimized power factor of 42.1 μW/mK 2 has been obtained at room temperature for a PEDOT/PSS/Te (80 wt.%) sample, which is about ten times larger than that of the untreated PEDOT/PSS/Te composite film.
研究领域:
材料科学
·
能源技术
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Qiufeng Meng,Kefeng Cai,Yong Du,Lidong Chen
In this work, single-walled carbon nanotube (SWCNT)/PEDOT:PSS coated Te nanorod (PC-Te) composite films were prepared by a simple vacuum assisted filtration method, and H 2 SO 4 treatment was employed to improve the thermoelectric performance of the composite films. The addition of SWCNTs apparently improved the electrical conductivity while reduced the Seebeck coefficient of the composite films, resulting in a reduction of the power factor. After treated with H 2 SO 4 , the electrical conductivity of the composite films was further improved, and the Seebeck coefficient decreased slightly. As a consequence, an optimized power factor of 104 μW/mK 2 (corresponding to the electrical conductivity of 332 S/cm and Seebeck coefficient of 56 μV/K, respectively) was obtained for the sample containing 70 wt% SWCNTs at 300 K. A flexible thermoelectric generator prototype was fabricated to demonstrate the output properties. The open circuit voltage and maximum output power delivered from the prototype were 5.6 mV and 53.6 nW, respectively, at a temperature difference of 44 K.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Xuan Wu,Xingwu Guo,Chenjing Gao,Jing Luo,Lewen Nie,Juan Chen,Liming Peng
WO 3 -based optical hydrogen sensors, while advantageous due to their ignition-free operation and resistance to electromagnetic interference, face limitations due to slow response kinetics in hydrogen gasochromic processes. This study presents a novel post-treatment method using aqueous sulfuric acid, which significantly enhances the response speed of mesoporous Pt/WO 3 films. After treatment, the films exhibit an ultrashort response time of 2.4 s towards 4% H 2 /Ar, a marked improvement from 7.1 s prior to the treatment. The treated films also show excellent reversibility of 120 gasochromic cycles. The adsorbed acid layer is proved to be the cause of accelerated hydrogen gasochromic response. This exceptional performance is attributed to increased proton conductivity and the high porosity of the mesoporous structure. A modified model is proposed for the acceleration effect by acid post-treatment. Our post-treatment method represents a significant advancement in the reliable detection of hydrogen leaks at room temperature.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Yang Yu,Fei Huang,Yide He,Xiyang Liu,Chenjing Song,Yanhua Xu,Yongjun Zhang
In this study, heterogeneous Fenton-like degradation of ofloxacin (OFX) was investigated by sludge derived carbon (SC). The effects of SC catalyst, temperature and pH on the efficiency of ofloxacin degradation were investigated. SC treated with sulfuric acid (SC-H 2 SO 4 ) performed high catalytic activity , indicating that sulfate group produced low pH of the surface and was beneficial for heterogeneous Fenton-like degradation. The removal of ofloxacin and TOC was 91.5% and 62.3%, respectively, after 180 min adsorption and 540 min oxidation, at pH 6 and a dosage of 138 mg L −1 H 2 O 2 . It was found that OFX conversion increased with the decrease of pH and OFX was degraded under the wide range of pH (3–6) by SC-H 2 SO 4 . These promising results clearly demonstrate the potential of the heterogeneous Fenton-like process for the effective degradation of ofloxacin by SC-H 2 SO 4 . Based on intermediated products identified by gas chromatography–mass spectrometry, a possible OFX oxidation pathway in Fenton-like reaction was proposed.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2024
·
IF 15.8
Peng Li,Henan Wang,Zhongshi Ju,Zhongzheng Jin,Jiangang Ma,Lin Yang,Xiaoning Zhao,Haiyang Xu,Yichun Liu
Hydrogels are emerging as stretchable electromagnetic interference (EMI) shielding materials because of their tissue-like mechanical properties and water-rich porous cellular structures. However, achieving high-performance hydrogel shields remains a challenge because enhancing conductivity often results in a compromise in deformation adoptability. This work proposes a treatment strategy involving sulfuric acid/titanium carbide MXene, which can simultaneously enhance the conductivity and stretchability of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/poly(vinyl alcohol) (PVA) double-network hydrogels. Multiple spectroscopic characterizations reveal that sulfuric acid promotes the linear conformation transition of the PEDOT molecular chain, while MXene increases charge delocalization and hydrogen bond cross-linking sites. The hydrogels, synthesized with a combined content of 0.6 wt % of MXene and PEDOT:PSS, exhibit an average X-band EMI SE of 41 dB. This performance is sustained at 94.5%, even following stretching and release at a strain of 200%. Interestingly, the EMI SE is found to linearly increase, reaching a value of 99 dB as the frequency is increased to 26.5 GHz. This increase is attributed to the enhanced water molecular polarization process, as supported by theoretical calculations of the impedance and attenuation constant. This work introduces a post-treatment technique that optimizes double-network hydrogels, providing deep insights into their EMI shielding mechanism and enabling high-performance EMI shielding with an ultralow conductive filler content.
研究领域:
材料科学
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电子工程
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产品关联
DOI
PubMed
高影响因子
ACS ES&T Engineering
·
2024
·
IF 7.4
Xiaojian Wang,Hang Zhang,Yingkang Chen,Jialin Zheng,Heping Chen,Kang Liu,Junwei Fu,Zhang Lin,Liyuan Chai,Min Liu
Tetrafluoromethane (CF4), as a typical perfluorocarbon (PFC), has a remarkable global warming potential (GWP) of 7390 and an ultralong lifetime of 50 000 years, making its effective treatment crucial for mitigating environmental impact. Catalytic hydrolysis is a promising way for its effective decomposition, in which Al-based materials have been widely used as efficient catalysts. However, the deficiency of strong Lewis acidic-tricoordinated Al (AlIII) sites strongly limits their catalytic performance. In this work, efficient CF4 decomposition was achieved via promoting AlIII sites over ZnAl2O4 through a facile acid treatment strategy. Among various acid treatments, it was found that H2SO4 treated ZnAl2O4 could achieve 100% CF4 decomposition under a relatively low temperature of 600 °C and kept above 70% removal for over 160 h running. The 27Al magic angle spinning nuclear magnetic resonance (MAS NMR) spectra demonstrated that the proportion of AlIII was increased from ∼0% of the pristine one to 7.5% after H2SO4 treatment. Pyridine-infrared (Py-IR) spectroscopy and NH3 temperature-programmed desorption (NH3-TPD) and CF4-TPD tests indicated that the amount of acid sites and the adsorption capacity of CF4 were dramatically improved after acid treatment. This work proposes a new strategy to improve CF4 decomposition.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Fiber Materials
·
2024
·Vol. 6
·期 2
·607-618
·
IF 17.2
Wu Ting,Shi Xiao-Lei,Liu Wei-Di,Li Meng,Yue Fang,Huang Pei,Liu Qingfeng,Chen Zhi-Gang
Organic thermoelectric fibers have great potential as wearable thermoelectric textiles because of their one-dimensional structure and high flexibility. However, the insufficient thermoelectric performance, high fabrication cost, and mechanical fragility of most organic thermoelectric fibers significantly limit their practical applications. Here, we employ a rapid and cost-effective wet-spinning method to prepare dimethyl sulfoxide-doped poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) fiber bundles, followed by rational post-treatment with concentrated sulfuric acid (98% H 2 SO 4 ) to enhance their thermoelectric performance. The wearable fiber bundles composed of multiple individual PEDOT:PSS fibers have effectively reduced resistance and overall high tensile strength and stability. Rational treatment with H 2 SO 4 partially removes excessive PSS, thereby increasing the electrical conductivity to 4464 S cm ‒1 , while the parallel bundle is also a major factor in improving the power factor of up to 80.8 μW m ‒1 K ‒2 , which is super-competitive compared with those of currently published studies. Besides, the thermoelectric device based on these fiber bundles exhibits high flexibility and promising output power of 2.25 nW at a temperature difference of 25 K. Our work provides insights into the fabrication of all-organic flexible high-conductivity textiles with high thermoelectric properties. Graphical
研究领域:
材料科学
·
纳米技术
·
热电材料
·
柔性电子学
·
高分子科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Qianqian Lan,Chao Feng,Kaiqin Ou,Zicheng Wang,Yong Wang,Tianxi Liu
Membranes with sub-10-nm pores are receiving growing interest in recognizing and separating nanocolloids , biomolecules, and soluble salts from water, but suffer from difficulty of optimizing pore structures and inferior stability. Herein, we report an efficient method for the preparation of robust nanoporous phenolic membranes with widely tunable pore sizes in the range of nanofiltration and tight-ultrafiltration. Solutions of resol precursors and poly(ethylene glycol)s (PEGs) are spin-coated to form thin films and then heated to thermopolymerize resols into phenolics. Subsequently, the films are treated in H 2 SO 4 solution to degrade PEGs, producing nanoporous phenolic membranes. Thus-prepared phenolic membranes exhibit adjustable effective pore sizes and tunable separation performances from nanofiltration to tight-ultrafiltration, which is otherwise inaccessible. Due to the thin thicknesses and rich water channels, the membranes exhibit higher permeances than other tight-ultrafiltration membranes and commercial ultrafiltration membranes with similar rejections. Furthermore, thanks to the robust frameworks and good chemical resistance of phenolics, the membranes deliver stable performances in long-term operations, elevated pressures, and acidic conditions. This work provides a facile and universal strategy for the synthesis of membranes with sub-10-nm pores for nanofiltration and tight-ultrafiltration.
研究领域:
材料科学
·
环境工程
·
膜技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2024
·Vol. 16
·期 17
·8378-8389
·
IF 5.8
Yao Yang,Bin Wang,Qian Liu,Zhenghua Wei,Ziye Mou,Quan Li,Chunfa Chen,Zaichun You,Bang Lin Li,Guansong Wang,Zhi Xu,Hang Qian
Bacterial infection is one of the most serious clinical complications, with life-threatening outcomes. Nature-inspired biomaterials offer appealing microscale and nanoscale architectures that are often hard to fabricate by traditional technologies. Inspired by the light-harvesting nature, we engineered sulfuric acid-treated sunflower sporopollenin exine-derived microcapsules (HSECs) to capture light and bacteria for antimicrobial photothermal therapy. Sulfuric acid-treated HSECs show a greatly enhanced photothermal performance and a strong bacteria-capturing ability against Gram-positive bacteria. This is attributed to the hierarchical micro/nanostructure and surface chemistry alteration of HSECs. To test the potential for clinical application, an in situ bacteria-capturing, near-infrared (NIR) light-triggered hydrogel made of HSECs and curdlan is applied in photothermal therapy for infected skin wounds. HSECs and curdlan suspension that spread on bacteria-infected skin wounds of mice first capture the local bacteria and then form hydrogels on the wound upon NIR light stimulation. The combination shows a superior antibacterial efficiency of 98.4% compared to NIR therapy alone and achieved a wound healing ratio of 89.4%. The current study suggests that the bacteria-capturing ability and photothermal properties make HSECs an excellent platform for the phototherapy of bacteria-infected diseases. Future work that can fully take advantage of the hierarchical micro/nanostructure of HSECs for multiple biomedical applications is highly promising and desirable.
研究领域:
生物医学工程
·
材料科学
·
微生物学
·
光疗
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）