APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Guanliang Chen,Xiujuan Lin,Jianan Li,Shifeng Huang,Xin Cheng
Polymer-based composites comprising of high dielectric constant ceramic nanoparticles are widely used in dielectric capacitors due to their excellent energy storage and processing properties. In this study, ultra-small Ni nanoparticles were used to fabricate core-satellite structured hybrid Ni@BT nanoparticles. Compared with BT/PVDF composites, the Ni@BT/PVDF nanocomposites exhibited the enhanced energy storage properties due to the low electric conductivity, small dielectric loss and improved breakdown strength. The maximum discharged energy density reached 9.55 J/cm 3 for nanocomposites with 3 vol% Ni@BT at the electric field of 350 kV/mm, which was nearly eight times of commercial BOPP (1.2 J/cm 3 at 640 kV/mm) and was around 208% compared to the pristine PVDF (4.58 J/cm 3 at 340 kV/mm). The improved energy density of the nanocomposites could be attributed to the Coulomb-blockade effect of the introduced ultra-small Ni nanoparticles exactly. This work provides an effective approach to improve the energy storage property of dielectric nanocomposites.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-13
·
IF 14.7
Xue Dongping,Yuan Yifang,Yu Yue,Xu Siran,Wei Yifan,Zhang Jiaqi,Guo Haizhong,Shao Minhua,Zhang Jia-Nan
Disentangling the limitations of O-O bond activation and OH* site-blocking effects on Pt sites is key to improving the intrinsic activity and stability of low-Pt catalysts for the oxygen reduction reaction (ORR). Herein, we integrate of PtFe alloy nanocrystals on a single-atom Fe-N-C substrate (PtFe@Fe SAs -N-C) and further construct a ferromagnetic platform to investigate the regulation behavior of the spin occupancy state of the Pt d -orbital in the ORR. PtFe@Fe SAs -N-C delivers a mass activity of 0.75 A mg Pt −1 at 0.9 V and a peak power density of 1240 mW cm −2 in the fuel-cell, outperforming the commercial Pt/C catalyst, and a mass activity retention of 97%, with no noticeable current drop at 0.6 V for more than 220 h, is attained. Operando spectroelectrochemistry decodes the orbital interaction mechanism between the active center and reaction intermediates. The Pt dz 2 orbital occupation state is regulated to t 2g 6 e g 3 by spin-charge injection, suppressing the OH* site-blocking effect and effectively inhibiting H 2 O 2 production. This work provides valuable insights into designing high-performance and low-Pt catalysts via spintronics-level engineering.
研究领域:
材料科学
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电化学
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催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
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2024
·
IF 8.9
Guiwei Yan,Jun Sun,Juanwen Yan,Bijun Fang,Shuai Zhang,Xiaolong Lu,Xiangyong Zhao,Feifei Wang,Jianning Ding
The effects of sandwich heterostructure on the energy-storage property are still existing some “mess”, detailed and systematic investigation should be carried out. In this work, novel sandwich heterostructure ceramics composed of (Ba 0.94 Li 0.02 La 0.04 )(Mg 0.04 Ti 0.96 )O 3 and 0.85(Ba 0.94 Li 0.02 La 0.04 )(Mg 0.04 Ti 0.96 )O 3 –0.15NaNbO 3 were prepared by film stacking and laminating technology and traditional solid-state sintering, to reveal the relationship between sandwich heterostructure and energy-storage performance. Sandwich heterojunction significantly affects electron-injection, space-charge, build-in electric field ( E i ) direction, interlayer-coupling, interface-blocking and clamping effect. E i direction is adjusted and electric tree growth is restrained. Interface blocking effect mainly occurs when E i direction is opposite to applied electric field . Comparatively high polarization and tilted polarization-electric field hysteresis loops are obtained. Outstanding recoverable energy-storage density of 5.81 J/cm 3 and discharge energy density of 3.99 J/cm 3 are gained with current density of 1016.71 A/cm 2 and power density of 305.01 MW/cm 3 . Satisfactory frequency stability, temperature stability and anti-fatigue feature are also achieved. Such sandwich heterostructure design develops a convenient and effective method to enhance energy-storage performance, and related research guides the study of energy-storage performance in multilayer heterostructure.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 25
·1804160
·
IF 15.621
Ming Wu,Long Yan,Ting Wang,Bo Zhou,Qinyuan Zhang
Photon upconversion multiplexing has attracted increasing interest in recent years; however, realizing the red color–based multicolor-tunable output in upconversion nanoparticles (UCNPs) at a fixed composition remains a huge challenge. Here, a novel and versatile approach to fine-control upconversion luminescence (UCL) colors from UCNPs through selectively confining specific excitation energy by the photon blocking effect is reported. Four types of dual-color switchable UCNPs capable of emitting red-blue and red-green emissions are successfully designed following this strategy, and their UCL performance shows a multiwavelength (808/980/1550 nm) excitable feature that is well sustained in a wide range of excitation power density. The use of the photon blocking effect further enables the dynamically switchable red-green-blue UCL with 808/980 nm excitations. These findings provide a general method to achieve multicolor-tunable UCL at a single nanoparticle level. Moreover, the UCNPs with red-based multicolor emissions in this work enriches the upconversion system and should have potential applications in display, anti-counterfeiting, and bioimaging.
研究领域:
材料科学
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光学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sensors
·
2021
·
IF 7.711
Qiuni Zhao,Deming Sun,Si Wang,Zaihua Duan,Zhen Yuan,Guangfen Wei,Jian-Long Xu,Huiling Tai,Yadong Jiang
Titanium carbide (Ti3C2Tx) with a distinctive structure, abundant surface chemical groups, and good electrical conductivity has shown great potential in fabricating superior gas sensors, but several challenges, such as low response kinetics, poor reversibility, and serious baseline drift, still remain. In this work, γ-poly(l-glutamic acid) (γ-PGA) with a blocking effect is exploited to modify Ti3C2Tx, thereby stimulating the positive response behavior of Ti3C2Tx and improving its gas sensing performance. On account of the unique synergetic interaction between Ti3C2Tx and γ-PGA, the response of the flexible Ti3C2Tx/γ-PGA gas sensor to 50 ppm NO2has been improved to a large extent (average 1127.3%), which is 85 times that of Ti3C2Tx (only 13.2%). Moreover, the as-fabricated Ti3C2Tx/γ-PGA sensor not only exhibits a shorter response/recovery time (average 43.4/3 s) compared with the Ti3C2Tx-based sensor (∼18.5/18.3 min) but also shows good reversibility and repeatability (relative standard deviation (RSD) <1%) at room temperature within 50% relative humidity (RH). The improved gas sensing properties of the Ti3C2Tx/γ-PGA sensor can be attributed to the enhancement of effective adsorption and the blocking effect assisted by water molecules. Furthermore, the gas sensing response of the Ti3C2Tx/γ-PGA sensor is studied at different RHs, and humidity compensation of the sensor is carried out using the multiple regression method. This work demonstrates a novel strategy to enhance the gas sensing properties of Ti3C2Tx by γ-PGA modification and provides a new way to realize highly responsive gas detection at room temperature.
研究领域:
材料科学
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环境科学
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传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 6
·1-11
·
IF 6.408
Shen Yizhong,Wei Yunlong,Liu Zhenmin,Nie Chao,Ye Yingwang
Accurate and low-cost onsite assay of residual antibiotics in food and agriculture-related matrixes (e.g., milk) is of significant importance for evaluating and controlling food pollution risk. Herein, we employed hybrid Cu-doped-g-C 3 N 4 nanozyme to engineer smartphone-assisted onsite visual sensor for reliable and precise reporting the levels of tetracycline (TC) residues in milk through π-π stacking-triggered blocking effect. Benefiting from the synergetic effects of Cu 2+ and g-C 3 N 4 nanosheet, Cu-doped-g-C 3 N 4 nanocomposite exhibited an improved peroxidase-like activity, which could effectively catalyze H 2 O 2 to oxidate colorless TMB into steel-blue product oxTMB. Interestingly, owing to the blocking effect caused by the π-π stacking interaction between TC tetraphenyl skeleton and Cu-doped-g-C 3 N 4 nanozyme, the affinity of Cu-doped-g-C 3 N 4 nanocomposite toward the catalytic substrates was remarkably blocked, resulting in a TC concentration-dependent fading of solution color. Using smartphone-assisted detection a simple, low-cost, reliable, and sensitive portable colorimetric sensor-based nanozyme for onsite visual monitoring the residual TC in milk was successfully developed with a detection limit of 86.27 nM. Of particular mention is that this detection limit is comparable to most other reported colorimetric methods and below most official allowable residue thresholds in milk matrixes. This work gave a novel insight to integrate two-dimensional (2D) artificial nanozymes-based π-π stacking-triggered blocking effect with smartphone-assisted detection for developing efficient and low-cost colorimetric point-of-care testing of the risk factors in food and agriculture-related matrixes. Graphical abstract
研究领域:
分析化学
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纳米技术
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食品科学
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环境科学
✓ 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）