JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Lijuan Yang,Yujie Zhao,Lijun Zhu,Daohong Xia
Superionic conductors regulated transition metal chalcogenides are the newly emerged electrocatalyst in water electrolysis into clean hydrogen and oxygen. However, there is still much room for the development of structural design, electronic modulation and heterogeneous interface construction to improve the overall water splitting performance in pH-universal solutions, especially in alkaline and neutral mediums. Herein, using β-cyclodextrin (β-CD) and citric acid (CA) organics with abundant hydroxyl (–OH) and carboxyl (–COOH), a special Ag 2 Se nanoparticles-decorated CoSe 2 flower-like nanosheets loaded on porous and conductive nickel foam substrate (Ag 2 Se-CoSe 2 /NF) was successfully constructed by a new method of monometallic cation release of coordinated cobalt. The Ag 2 Se phase exerts the nature characteristics of superionic conductors to modulate the morphological and electronic structures of CoSe 2 as well as improve its conductivity. The generated rich active interfaces and abundant Se vacancy defects facilitate numerous active sites exposure to accelerate the hydrogen ion transport and charge transfer. Compared to the single-phase Ag 2 Se/NF-8 and CoSe 2 /NF, the prepared Ag 2 Se-CoSe 2 /NF-8 with a two-phase synergistic effect achieves an outstanding pH-universal electrocatalytic hydrogen production performance by water electrolysis, as evidenced by a lower overpotential (60 mV, 212 mV and 85 mV vs RHE at 10 mA cm −2 for pH = 0.36, 7.00 and 13.70, respectively). Only a voltage of 1.55 V at 10 mA cm −2 is required to implement the overall water splitting in an alkaline electrolyzer. This work provides significant guidance for the future designation and practical development of transition metal chalcogenides with superionic conductors applied in the electrocatalytic field.
研究领域:
材料科学
·
电催化
·
能源转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Toxicology Research
·
2017
·Vol. 6
·期 5
·693-704
·
IF 1.969
Tang Huan,Yang Sheng-Tao,Ke Da-Ming,Yang Yi-Fan,Liu Jia-Hui,Chen Xing,Wang Haifang,Liu Yuanfang
Ag2Se quantum dots (QDs) are novel fluorescent probes in the second near-infrared window with great imaging quality and biocompatibility. Surface modification is an essential step to disperse Ag2Se QDs into biological fluids, and endow Ag2Se QDs with diverse surface chemistry. However, the effect of surface chemistry on the biological behaviors and chemical fates of Ag2Se QDs has not been studied, which hinders the design of suitable Ag2Se QDs for biomedical applications. Here, the distribution, degradation, excretion and toxicity of 2-aminoethanethiol and mercaptopropionic acid coated Ag2Se QDs (denoted as QDs-MEA and QDs-MPA, respectively) were systematically investigated in mice for a 28-day observation period after a single intravenous injection. Ag2Se QDs with different surface chemistries displayed similar trends in all observations, such as fast blood clearance, main uptake in the liver and spleen, severe biotransformation, Ag excretion through feces, and low toxicity. The major different behaviors observed were the partially pulmonary deposition, the faster transformation at the initial stage, the lower excretion percentage, and the more obvious damage to the liver by QDs-MEA compared to QDs-MPA. The surface chemistry of Ag2Se QDs regulated their biological behaviors and chemical fates in vivo, and surface chemistry should be fully regarded when designing Ag2Se QDs for biomedical applications from the biosafety perspective.
研究领域:
生物医学
·
纳米材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Scientific Reports
·
2024
·Vol. 14
·期 1
·1-11
·
IF 3.8
Tian Gailing,Shi Weipeng,Guo Rui,Guo Rui,Zhang Wenjing,Liu Dan,Xue Chenyang
The development of thermoelectric devices provides an ideal solution for self-sustaining Internet of Things (IoT) applications. However, existing thermoelectric devices face issues such as low integration levels and poor stability. To address these challenges, this paper presents a novel method for fabricating flexible thermoelectric devices using Ag 2 Se/MgAgSb, which combines MEMS lithographic lift-off techniques to achieve precise control over the dimensions of the thermoelectric functional layer while also reducing fabrication costs. The optimal cell dimensions were identified through simulations. The device achieved an open circuit voltage of 0.49 mV at a temperature difference of 50 K. Additionally, the output power density of the Ag₂Se/MgAgSb flexible Y-type thermoelectric device reached 3.39 µW/m² at a temperature difference of 5 K. The device also demonstrated excellent flexibility; even after being bent 800 times around a glass rod with a diameter of 4 mm, its conductivity decreased by only 12%. Furthermore, it maintained stability under high humidity conditions. This work offers a novel strategy for the miniaturization and large-area controllable fabrication of flexible and reliable thermoelectric devices, as well as an enhancement in their reliability.
研究领域:
材料科学
·
纳米技术
·
能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Science-Materials in Engineering
·
2025
·Vol. 20
·期 1
·1-10
·
IF 0
Wang Ruoxi,Sun Rongke,Ren Yanmei,Ma Yanqing,Ma Lei
There is still limited research on the influence of polymer content in inorganic/organic materials on thermoelectric properties. In this study, we systematically investigated the influence of the content of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) in the Ag 2 Se nanowires/PEDOT:PSS (Ag 2 Se NWs/PEDOT:PSS) composite films on the thermoelectric properties. When the content of PEDOT:PSS is 1.54 wt%, the composite film achieved the highest power factor (PF) of ~ 2074.0 µW m −1 K −2 at room temperature. The maximum output power ( P max ) of the single-leg thermoelectric device based on the composite film is approximately 49.42 nW, and the maximum power density (PD max ) is 4.28 W m −2 at a temperature difference of 25 K. Furthermore, the film exhibits superior flexibility with 94.3% of the original performance retention after 2000 bending cycles around a rod with a diameter of 5 mm. This work provides valuable guidance for the design and fabrication of high-performance flexible inorganic/organic composite thermoelectric materials.
研究领域:
材料科学
·
纳米技术
·
能源转换
·
高分子化学
✓ 已验证
产品关联
DOI
Materials Today Physics
·
2020
·
IF 10.443
Y. Lu,Y. Qiu,K. Cai,X. Li,M. Gao,C. Jiang,J. He
The thermoelectric (TE) properties of organic/inorganic composite materials have been extensively studied for nearly one decade but there still has no significant breakthrough. Herein, we developed a facile method to prepare poly(3,4-ethylenedioxythiophene) (PEDOT)/Ag 2 Se/CuAgSe ternary composite films with ultrahigh performance and superior flexibility. First, PEDOT:poly(styrenesulfonate) (PSS)–coated Se (PC-Se) nanowires (NWs) were chemically in situ synthesized, then the PC-Se NWs were used as templates to prepare PEDOT:PSS coated Ag 2 Se/CuAgSe NWs, and finally highly flexible PEDOT/Ag 2 Se/CuAgSe ternary composite films on porous nylon membrane were fabricated by vacuum assisted filtration and then hot pressing. An optimized composite film with hierarchical microstructure defects shows a record power factor (PF) of ~1603 μW m −1 K −2 (corresponding 0.6 < ZT < 1.05) at 300 K, which is the record value for TE organic/inorganic composite materials. After bending for 1000 cycles around a 4-mm radius rod , about 92% of the initial PF is maintained, exhibiting an excellent flexibility, which is attributed to the synergetic effect of the flexible nylon membrane, the porous PEDOT/Ag 2 Se/CuAgSe film, and specifically the PEDOT as a binder. Moreover, a flexible TE module composed of 11 single-leg of the film generates a voltage of 45.8 mV and a maximum power of 3.2 μW (power density of 8.4 W m −2 ) at a temperature gradient of 36 K, verifying excellent TE properties of the film. This work provides a great idea for design and fabrication of high-performance flexible TE films, which can be extended to other chalcogenides/PEDOT composites and will certainly promote the development and application of TE organic/inorganic composite films.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2021
·Vol. 17
·期 8
·2006111
·
IF 13.281
Mengxuan Yu,Xiaohu Yang,Yejun Zhang,Hongchao Yang,Haoying Huang,Zan Wang,Jinyi Dong,Rong Zhang,Ziqiang Sun,Chunyan Li,Qiangbin Wang
Ag 2 Se quantum dots (QDs) as an effective biological probe in the second near-infrared window (NIR-II, 1000–1700 nm) have been widely applied in bioimaging with high tissue penetration depth and high spatiotemporal resolution. However, the ions deficiency and crystal defects caused by the high Ag + mobility in Ag 2 Se crystals are mainly responsible for the inefficient photoluminescence (PL) of Ag 2 Se QDs. Herein, a tailored route is reported to achieve controllable doping of Ag 2 Se QDs in which Ag is exchanged by Pb via cation exchange (CE), which is unattainable by direct synthetic methods. The Pb-doped Ag 2 Se QDs (denoted as Pb:Ag 2 Se QDs) present fire-new optical features with significantly enhanced PL intensity of 4.2 folds. Photoelectron spectroscopy confirms that Pb acts as an n-type dopant for Ag 2 Se QDs and therefore the electronic impurities provide additional carriers to fill the traps. Moreover, the general validity of this method is demonstrated to convert different sized Ag 2 Se into Pb:Ag 2 Se QDs, so that a wide range of NIR-II PL with high intensity is obtained. The bright NIR-II emission of Pb:Ag 2 Se QDs is further successfully performed in lymphatic system mapping.
研究领域:
生物医学工程
·
材料科学
·
光学成像
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 15
·20295-20305
·
IF 2.478
Zhao Yaxin,Liu Dan,Yan Zhuqing,Zhang Zhidong,Zheng Yongqiu,Zhang Yanjun,Xue Chenyang
In recent years, the demand for wearable devices has promoted the research of flexible thermoelectric generators. Herein, this work reports a facile method to prepare the flexible Ag 2 Se/polyvinyl pyrrolidone (PVP) composite films. The Ag 2 Se nanorods are synthesized by the template method and then mixed with PVP solution to form the composite film optimized by the content of Ag 2 Se. The maximum power factor of the film is 16.18 µW m −1 K −2 at 320 K, and the thermoelectric generator (TEG) has an output voltage and power of 5.49 mV and 55.57 nW at a temperature difference of 40 K, respectively. Moreover, the Ag 2 Se/PVP film has good flexibility and can withstand multiple bending, the electrical conductivity reaching 89.8% and 76 % at 500 and 1000, respectively. PVP has an excellent protective capabilities effect so that the TE performance can remain stable in 40 days, and then the electrical conductivity only drops to 89 % of the initial value at 50 days. This work provides an effective method for preparing wearable thermoelectric devices, which can be extended to other composite materials.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Ting Liang,Jingwen Wei,Shiming Zhang,Jinhang Yang,Jiangli Sun,Zuji Li,Zhihong Li,Zebin Yu,Shuangfei Wang,Yanping Hou
Design of photocatalysts with high-efficiency for sunlight utilization is one of the prerequisites for CO 2 photoreduction . Besides, modulating a stable electron-donating environment to meet the energy barrier for CO 2 reduction to CO is crucial. In this work, the ZnSe/Ag 2 Se/AgBr (ZAA) heterojunction was fabricated by growing the ZnSe on the AgBr surface accompanied by in-situ generation of Ag 2 Se between the two components by hydrothermal process. Results showed that the ZAA exhibited excellent light response ability over the full wavelength range. X-ray photoelectron spectroscopy (XPS) and electron spin resonance (ESR) demonstrated that the charge transfer of the ZAA conformed to dual Z-scheme mechanism, with the Ag 2 Se acting as an electron transfer bridge, which in turn acted as an electron reservoir to accelerate electron transfer, facilitating carriers’ separation. The highest CO yield of 54.14 µmol/g/h was obtained from the optimal ZAA-2, which was 11.76 and 10.44 times of pure ZnSe and Ag 2 Se, respectively. This work demonstrated the feasibility of a dual Z-scheme heterostructure with full spectrum response for offering stable electron-donating environment and improving electron transfer for enhanced photocatalytic activity.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Energy & Environmental Science
·
2025
·
IF 30.8
Lin Zhang,Hongjing Shang,Hao Dong,Hongwei Gu,Fazhu Ding
While flexible thermoelectric materials hold promise for wearable electronics, the low performance of films and the inefficiency of devices fundamentally restrict their practical applications. Herein, we have presented a microstructure engineering strategy to fabricate high-performance Ag2Se films. Via regulation of the grain-growth process, Ag2Se grains with large sizes are obtained, in which the carrier mobility is significantly enhanced to up to ∼1300 cm2 V−1 s−1 at room temperature due to the reduced electron scattering, and low-angle grain boundaries are developed, with the room-temperature lattice thermal conductivity decreasing to 0.26 W m−1 K−1 because of the increased mid-frequency phonon scattering, thus partially decoupling the electrical and thermal properties. Benefiting from this, a high ZT of 1.15 is achieved at 300 K. Using these films, a flexible and wearable thermoelectric generator incorporating 100 pairs of thermoelectric legs was successfully developed. In the generator, a sputtering Ag buffer layer was introduced to reduce the contact resistance and interfacial reaction. As a result, this thermoelectric generator exhibits an ultra-high normalized power density of ∼9.09 μW m−1 K−2, which is also the current record-breaking value among thermoelectric film devices. The superior performance allows the thermoelectric generator to power various portable electronics, including LED lights, wristwatches, and, particularly, smartphones. This work establishes a generalizable framework for developing high-performance and manufacturable thermoelectric materials and devices, narrowing the gap between laboratory breakthroughs and industrial adoption in wearable energy harvesting.
研究领域:
材料科学
·
纳米技术
·
能量收集
·
热电材料
·
柔性电子学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2024
·Vol. 16
·期 45
·21031-21038
·
IF 5.8
Hanwen Hu,Yiyan Liao,Shanshan Tan,Chen Li,Jun Tang,Kun Zheng,Lei Yang
Ag2Se has emerged as a promising n-type thermoelectric material; however, its application is limited mainly due to the strongly coupled charge carrier and phonon transport. Enhancing phonon scattering by constructing interfacial complexes often results in low carrier mobility due to its strong carrier scattering resulting from the high energy barrier at the multiphase interface. Inspired by the cell membrane with selective permeability, we construct bio-mimic grain boundaries with TiO2 and MoS2 co-decoration in Ag2Se to decouple electron scattering from strong phonon scattering. The nanostructured TiO2 with a high dielectric constant screens the interfacial Coulomb potential, ensuring efficient carrier transport and reducing the grain boundary barriers, while the few-layer MoS2 provides significant phonon scattering to further reduce the thermal conductivity. This method effectively enhances the zT value of Ag2Se by as much as 60% and also can significantly enhance the theoretical output performance of the thermoelectric device, which highlights the effectiveness of the bio-mimic grain boundary engineering strategy.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Microstructures
·
2025
·Vol. 5
·期 4
·N
·
IF 9
Wei-Peng Shi,Rui Guo,Gai-Ling Tian,Yi Chen,Yong-Hua Wang,Dan-Feng Cui,Dan Liu,Chen-Yang Xue
Photothermoelectric (PTE) detectors hold immense potential for converting incident light signals into electrical signals, finding applications in sensing, astronomy, night vision, and communication. However, their widespread adoption is hindered by issues such as slow response times, low responsivity, and poor stability. In this study, a high-performance self-powered PTE detector based on the Ag2Se nanorods (NRs) and multi-walled carbon nanotubes (MWCNTs) is reported for the first time. The findings reveal that the electrical conductivity of the film increases with the addition of MWCNTs, albeit at the expense of the Seebeck coefficient. Notably, the film containing 0.5 wt% MWCNTs exhibited a superior power factor (303.22 μW·m-1·K-2) at 300 K. Owing to the high PTE performance, the photosensitive properties are characterized in an ultra-broadband range from the violet (405 nm) to infrared (2,500 nm) wavelengths, featuring rapid response time (1.4 s) and substantial output voltage (6.83 mV). Furthermore, the device demonstrated remarkable stability, with only a 3.4% decrease in output voltage after three months of air exposure and negligible changes in thirty cycles. Thus, the proposed device presents a novel strategy for developing PTE detectors characterized by broadband coverage, fast response times, and exceptional stability.
研究领域:
光学工程
·
纳米材料
·
电子器件
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2023
·
IF 3.7
Zhenbang Xie,Qihang Liu,Haixin Zhao,Hongtai Chen,Guozhi Jia,E. Lei,Chao Wang,Yongzhu Zhou
The low charge separation and transfer of g-C 3 N 4 hinders its industrial application in photocatalytic hydrogen evolution. Here, we design a novel co-catalyst strategy to integrate Ag 2 Se nanoparticles in situ on the surface of g-C 3 N 4 . The optimized photocatalyst, 15% Ag 2 Se/g-C 3 N 4 , demonstrates remarkable photocatalytic efficiency in the hydrogen evolution rate, reaching to 1102.8 μmol·g −1 ·h −1 , 7 times higher than g-C 3 N 4 . To further elucidate the photocatalytic activity of 15% Ag 2 Se/g-C 3 N 4 , we present a possible mechanism based on various characterizations and density functional theory calculations. This research offers potential insights for the future development of silver chalcogenide composites in photocatalysis.
研究领域:
材料科学
·
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）