COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Xusen Li,Bingxin Sun,Liwei Lin,Yuanzhe Piao,Guowang Diao,Wang Zhang
This paper proposes a simple and rapid microwave-assisted phosphorus-oxygen doped porous carbon (P/O-PC) preparation strategy is proposed using potassium citrate, Phytic acid (PA), and ethanol under air atmosphere. PA can be used as both a phosphorus source and a microwave absorbing agent. The P/O-PC500–0.75 has a large specific surface area of 905 cm 2 /g. P/O doping introduces defects into the carbon structure, which enhances the capacitance of the porous carbon. The P/O-PC500–0.75 demonstrates excellent capacitance values of 330 F/g and 389.4 F/g in 6.0 M KOH and 1.0 M H 2 SO 4 , respectively (1 A/g). In addition, the symmetrical supercapacitors assembled with the P/O-PC500–0.75 exhibit good electrochemical stability over 5000 cycles at 5 A/g, with a capacitance loss of only 3.6%. This microwave-assisted strategy offers simplicity in operation and low energy consumption, providing a new and efficient pathway to prepare carbon materials in a fast and simple manner.
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
CARBON
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2022
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IF 11.307
Zhiwei Zhang,Jingqi Chen,Xuetao Yan,Xiaowei Liu,Yingying Chen,Chuanqi Zhao,Lingyan Feng
Carbon dots (CDs) due to their excellent photostability, good biocompatibility and multicolor fluorescence, have been preferentially selected as luminescent fluorophores and co-assembled with various chiral host templates in recent years. The as-prepared composites exhibit marvellous circularly polarized luminescence (CPL) activity and show promising potentials in the fields of stereopsis and optoelectronic display, which have drawn increasing attention. However, the fussy assembly procedure and over-reliance on template chirality extremely limit the design and application of CDs-composited materials in the field of CPL. In this work, we directly prepared the CDs-composited G-quartet hydrogels with CPL activity using a one-step microwave-assisted method, and their helical chiral structure and CPL orientation can be arbitrarily switched back and forth between left-handed and right-handed through K + and formation kinetics. Finally, the CDs-composited G-quartet hydrogels can be applied in anti-counterfeiting printing for encrypted information transfer, and their outstanding thermal cycling stability and CPL dissymmetry factor (g lum ) of up to 10 −1 demonstrate a wider application potential in CPL active materials based on CDs.
研究领域:
材料科学
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光学
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化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
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2024
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IF 6.1
Qingtao Wang,Xia Hu,Kai Cui,Yanxia Wu,Guofu Ma,Ziqiang Lei,Shufang Ren
An oxygen reduction reaction (ORR) catalyst is a crucial component of metal–air batteries. Herein, modified carbon nanotubes are used to support iron phthalocyanine, followed by the fabrication of single-atom and cluster coexisting catalysts by the fast microwave method. The two catalysts have Fe–N5 and Fe–P–N4 coordination structures, respectively. Electrochemical tests show that the FeNC/Fe–N5–C and FeNC/Fe–P–N4–C catalysts have half-wave potentials of 0.906 and 0.886 V in an alkaline solvent, respectively. The Zn–air battery prepared with the FeNC/Fe–N5–C catalyst has a specific capacity of 791 mA h g−1 and a maximum power density of 190 mW cm−2. DFT calculations show that the axial coordination bonds in FeNC/Fe–N5–C and FeNC/Fe–P–N4–C are conducive to the acceleration of the transfer of electrons. The d-band centers of the axial coordination Fe–N5 and Fe–P–N4 are closer to the Fermi level, confirming that the presence of the axial coordination bonds enhances the adsorption of the reaction intermediates and reduces the ORR barriers.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2020
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IF 8.247
Yayun Zheng,Yunrui Tian,Shatila Sarwar,Jujie Luo,Xinyu Zhang
This work reports the fabrication of carbon nanotube (CNT) decorated NiSe 2 nanosheets (NiSe 2 @CNT) by a rapid microwave process in 2 min. Interestingly, NiSe 2 @CNT has a lamellar and tubular interwoven morphology. The specific capacitance of the prepared electrodes with different microwave conditions for supercapacitors were studied. Meanwhile, we compared the electrochemical performances of NiSe 2 @CNT with the presence of different amount of CNT. The optimal NiSe 2 @CNT electrode can demonstrate a high specific capacitance of 980.5 F g −1 at a current density of 1 A g −1 and good cycling stability of 82% retention after 9000 cycles at 5 A g −1 . In addition, an asymmetric supercapacitor was assembled by NiSe 2 @CNT as positive electrode and activated carbon (AC) as negative electrode , which successfully light four white light emitting diodes (LEDs) for 6 min with an energy density of 25.61 Wh kg −1 at a power density of 810 W kg −1 .
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
CARBON
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2018
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IF 7.082
Yican Wang,Wenlong Wang,Jing Sun,Chenggong Sun,Yukun Feng,Zhe Li
Microwave-metal discharge was proposed as a facile methodology to prepare unique Fe-cored carbon nanocapsules (Fe@CNCs) with high purity, novel stability and extraordinary electromagnetic wave (EMW) absorption performance . The effect of microwave power, irradiation time and cyclohexane/ferrocene ratio on the production of Fe@CNCs was examined and the properties of the nanocapsules, such as their Fe content , phase, yield, degree of graphitization and associated microstructures were investigated in detail. It was found that the prepared Fe@CNCs, which can easily be separated from the reaction system, displayed exceedingly high electromagnetic wave (EMW) absorption performance over the 2–18 GHz range. At the minimal reflection loss (RL) values over −10 dB, the EMW absorption bandwidth can reach up to 13.8 GHz with an absorber thickness of 1.5–5 mm. In addition, novel thermo-oxidative stability and super anti-corrosion property were also obtained for the Fe@CNCs as no signs of any corrosion or oxidative degradation loss were observed from the accelerated degradation tests in air and acid at temperatures up to 420 °C. The exceedingly high EMW absorption performance coupled with the superior anti-degradation and anti-corrosion properties of the prepared nanocomposite microcapsules highlights the novel capability of microwave-metal discharge in synthesizing advanced metal-cored nanocarbon microcapsules with promising application potentials in diverse fields, such as but not limited to microwave absorption, EM shielding and advanced separations etc.
研究领域:
材料科学
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电磁学
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2020
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IF 6.444
Ao Zhong,Jinhui Li,Yu Zhang,Fan Zhang,Tao Wang,Guoping Zhang,Rong Sun,Ching-Ping Wong
The mechanical brittleness and structure collapse of three-dimensional (3D) graphene composite construction is still an enormous issue in flexible performance of complex. In addition, low temperature and efficient process become increasingly significant and noticeable in field of semiconductor device to prevent from huge resource waste and energy consumption. Herein, we report a special method to prepare 3D graphene/polyimide (rGO/PI) aerogel with low temperature and rapid procedure. The aerogel is synthesized by introducing water-soluble polyamic acid ionic salt (PAS) and ice-templating directional solidification to establish unique oriented structure, and by energy-efficient microwave to realize low temperature and rapid imidization. The preparative rGO/PI nanocomposite aerogels hold excellent electrical conductivity , desirable flexibility, superior pressure-responsive properties, remarkable compression sensitivity and durability, so that adapt to multifarious deformations with huge potential for flexible wearable devices .
研究领域:
材料科学
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纳米技术
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柔性电子
✓ 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）