JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 43
·20268-20282
·
IF 3.5
Qiu Hongfang,Peng Jian,Xu Weiwei,Fang Xiong,Lu Junyu,Di Xiaochuang,Lu Zhao,Chen Yang,Zou Huawei
The use of microwave absorption (MA) materials in practical aerospace applications would be challenging without a dependable mechanical support structure. However, achieving a wide effective absorption bandwidth (EAB) in aramid honeycomb structures at low weight gain is crucial for the practical aerospace applications of MA materials. To address this challenge, this study proposes a combination of porous carbon foam and high structural strength honeycomb to achieve broadband microwave absorption in structural devices through the synergistic effect of carbon foam absorption and honeycomb structure. The uniform filling process of ultra-lightweight reduced GO aerogel is achieved through freeze-drying, solving the issues of uneven dispersion and incomplete filling of traditional absorbers in honeycombs. Further optimization and comprehensive evaluation of filling concentration and reduction process were carried out. The freeze-drying process combined with chemically reduced honeycomb samples filled with different concentrations of GO all exhibit broadband absorption performance. At a specific standard honeycomb thickness of 15 mm, uniformly filled honeycomb samples with 0.1 to 0.3% GO exhibit triple resonance peaks near 2–3 GHz, 8–9 GHz, and 15 GHz, with effective absorption peaks all below − 10 dB. Moreover, the incorporation of transparent wave honeycomb walls in conjunction with honeycomb materials enhances the overall impedance matching, leading to a further improvement in the EAB to 10.53 GHz for the honeycomb sample filled with 0.2% freeze-dried and reduced GO. CST simulation data confirms that the loss in the honeycomb samples originates from uniform conduction loss, and the electric field stably enters the interior of the honeycomb. This approach, based on the rapid and efficient filling of uniform RGO by freeze-drying, provides a new way to achieve broadband microwave absorption in aramid honeycombs and has significant potential for development in the field of aerospace stealth.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Qiaomei Sun,Pengjun Duan,Wenqing Zhang,Yuxuan Xie,Xiang Ni,Jianzhong Zheng
Photocatalytic technology is an attractive option for environmental remediation because of its green and sustainable nature. However, the inefficient utilization of solar energy and powder morphology currently impede its practical application. Here, we designed a floatable photocatalyst by anchoring 0D Cu2(OH)PO4 (CHP) nanoparticles on 2D graphene to construct 0D/2D CHP/reduced graphene oxide (rGO) aerogels. The CHP/rGO aerogels have interconnected mesopores that provide a large surface area, promoting particle dispersion and increasing the number of active sites. Moreover, the optical response of the CHP/rGO aerogel has been significantly expanded to cover the full spectrum of the solar light. Notably, the 20%CHP/rGO aerogel displayed a high degradation rate (k = 0.178 min–1) taking methylene blue (MB) as a model pollutant under light irradiation (λ > 420 nm). The enhanced photocatalytic activity is ascribed to the rapid electron transfer in the CHP/rGO heterostructures, as supported by the DFT theoretical calculations. Our research highlights the utilization of full spectrum responsive photocatalysts for the elimination of organic pollutants from wastewater under solar light irradiation, as well as the potential for catalyst recovery using floatable aerogels to meet industrial requirements.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2025
·Vol. 21
·期 42
·e05135
·
IF 12.1
Jinwei Zhang,Xiaolin Zhang,Junmin Xu,Xinyue Li,Dezhi Xiao,Zhixia Duan,Han Zhou,Xinchang Wang,Paul K. Chu
A porous KVPO 4 F/reduced graphene oxide (KVPF/rGO) microgrid aerogel electrode is designed and fabricated using direct ink writing 3D printing for high-performance potassium-ion battery cathodes. This 3D-printed KVPF/rGO aerogel electrode, which integrates well-dispersed KVPO 4 F microspheres in the reduced graphene oxide matrix, shows enhanced structural integrity and electrical conductivity, thereby facilitating efficient ion and electron transport. The KVPF/rGO electrode achieves a reversible discharge capacity of 99.0 mAh g −1 at a current density of 50 mA g −1 in the voltage range between 2.0 and 5.0 V. It retains 93.9% of its capacity after 100 cycles and delivers a discharge capacity of 72.6 mAh g −1 at a high current density of 500 mA g −1 , demonstrating good rate capability. The role of rGO in improving charge transfer and minimizing polarization is demonstrated. The flexibility of the 3D-printed electrodes is validated by fabricating soft-pack batteries, which maintain stable performance under mechanical stress, an essential requirement for wearable electronics. The results highlight the large potential of 3D printing technology to enhance the properties and flexibility of potassium-ion batteries and pave the way for future advancements in energy storage devices.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Wenqian Yan,Kunmeng Zhu,Yi Cui,Yanhan Li,Tao Dai,Sheng Cui,Xiaodong Shen
A new material of Ag-SnO 2 /rGO aerogel is fabricated by the sol-gel method and freeze-drying technique. The SnO 2 particles are tightly arranged on the rGO sheets to form a p-n heterojunction , and the rGO aerogel possesses abundant pore structures for effective adsorption. Besides, the Ag particles are dispersed on the surface as a catalyst to improve the internal electron mobility, further promoting the gas-sensing performance. To be noted, the Ag-SnO 2 /rGO aerogel can exhibit a response of 2.13 towards 50 ppm NO 2 at RT instead of heating conditions, and shows a cyclic capacitance property of redox. Moreover, the non-linear growth between gas concentration and response is observed, which proves the chemical adsorption that results in the high selectivity.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Xue Qi,Hongmin Gao,Lei Wu,Yang Zhou,Hehua Zhang,Dong Chang,Hongzhi Pan
Accurate and sensitive detection of the neurotransmitter dopamine (DA) plays a significant role in medical diagnosis and human health assessment. Herein, an electrochemical sensing platform for ultrasensitive determination of DA was constructed based on porous Co 3 O 4 nanocubes anchored to three-dimensional Ti 3 C 2 MXene-reduced graphene oxide aerogel (Co 3 O 4 /3D MX-rGO). The 3D MX-rGO aerogel with a high specific surface prevents aggregation of Co 3 O 4 nanocubes and exposes more active sites, resulting in excellent electrocatalytic activity and outstanding sensing properties. The electrochemical reaction kinetic was investigated in detail, a possible sensing mechanism was proposed, and the interaction mechanism between the composites and DA was revealed combined with density functional theory (DFT) calculations. Under optimized experimental conditions, the sensor developed using Co 3 O 4 /3D MX-rGO modified glassy carbon electrodes (GCE) exhibited low detection limits (40 nM) in the range of 0.1–300 μM for DA with good selectivity, reproducibility, and stability. The sensor has been successfully use to detect DA in human serum and urine samples with recoveries of 95.3 %-103.7 %, which has great potential for practical applications.
研究领域:
生物医学工程
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Honglu Wu,Dawei He,Yongsheng Wang
The core shell structure of Cobalt@carbon nano rod/reduced graphene oxide (Co@CNR/rGO) is facilely synthesized with a one-pot hydrothermal process. Nitrogen is also introduced into the carbonaceous materials during the synthesis process. Calcination is added to graphitize the carbonaceous material, and simultaneously crystallize the Co particles. To assemble an electrode, the calcined Co@N-CNR/rGO material is uniformly loaded onto a collector of nickel foam by electrophoretic deposition . The specific capacitance is measured to be as high as 3233.3 F g -1 at a current density of 0.1 A g -1 . Three-dimensional rGO aerogels with desirable rate ability and cyclic stability are self-assembled with a hydrothermal reduction process from graphene oxide . Practically, the calcined Co@N-CNR/rGO and 3D rGO aerogel are utilized as cathode and anode to fabricate an asymmetric supercapacitor device, respectively. The operating voltage window of the device is increased to 1.5 V, and the energy density reached 31.8 Whkg −1 at a power density of 302 W kg -1 , and 11.2 Whkg −1 at 45,000 W kg -1 , respectively. The cyclic galvanostatic charge discharge stability is also measured and showed 99.2% capacity retention after 10,000 cycles at a current density of 5 A g -1 .
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）