Article
Chemistry, Physical
Longzhong Wu, Ruiwen Shu, Jiabin Zhang, Xueting Chen
Summary: Nitrogen-doped reduced graphene oxide/cerium oxide (NRGO/CeO2) composite aerogels with low bulk density and unique 3D porous structure were fabricated via a hydrothermal route. The addition of CeO2 nanoparticles and careful regulation of CeO2 contents significantly improved the microwave dissipation performance of NRGO aerogels. The composite aerogel with a CeO2 content of 44.11 wt% exhibited excellent microwave attenuation capacity.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
M. M. Atta, M. I. A. Abdel Maksoud, O. I. Sallam, A. S. Awed
Summary: A one-step method using gamma-rays was developed to synthesize reduced graphene cotton yarn as a wearable supercapacitor. Increasing yarn concentration in the graphene oxide solution controlled the weight of deposited reduced graphene oxide sheets on the yarns, leading to improved electrochemical performance and stability.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
Junfeng Qiu, Haopeng Cao, Jun Liao, Rongxiao Du, Kai Dou, Natalia Tsidaeva, Wei Wang
Summary: Three-dimensional (3D) porous coral-like Co1.29Ni1.71O4 microspheres were successfully combined with reduced graphene oxide (rGO) to form Co1.29Ni1.71O4/rGO aerogels, serving as efficient microwave absorbers. The electromagnetic parameters of the composites can be effectively tuned by adjusting the mass ratio of Co1.29Ni1.71O4 microspheres and rGO, thereby improving their microwave absorption performance.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Energy & Fuels
Sevda Yetiman, Hilal Pecenek, Fatma Kilic Dokan, M. Serdar Onses, Erkan Yilmaz, Ertugrul Sahmetlioglu
Summary: This study presents the microwave-assisted preparation of cobalt oxide-based nanocomposite electrodes doped with carbon dots and reduced graphene oxide. The electrodes with carbon dots exhibit the highest specific capacitance and good rate capability, even at high current densities. The optimized electrodes are used to fabricate a symmetric supercapacitor with high specific capacitance and long cycle life.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Materials Science, Multidisciplinary
Wenshuai Jiang, Shumin Wang, Zhenxin Li, Yongtao Zhu, Yi Yu
Summary: The luminescence spectra of reduced graphene oxide (RGO) have been found to vary with different initial heat treatment temperatures, with a new spectral line appearing at 670 nm at temperatures above 500 degrees C. Additionally, changes in spectral lines at 588 and 765 nm (769 nm) were observed with varying initial heat treatment temperatures. A heat treatment of 400 degrees C was shown to facilitate the preparation of high-quality graphene with smaller defects, larger domain size, and higher conductivity with microwave irradiation.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Chemistry, Physical
Wanxi Li, Boqiong Li, Yali Zhao, Xiaoqin Wei, Fang Guo
Summary: Component regulation and microstructure design are effective strategies to improve microwave absorption performance. A sandwich-like graphene-based absorbent with adjustable Fe3O4 content was synthesized through ultrasonic dispersion, blast drying, and roasting. The sandwich structure formed multiple interfaces, prevented nanoparticle aggregation, and facilitated interface polarization, resulting in enhanced impedance matching and microwave attenuation. The absorbent achieved an effective absorption bandwidth of 5.7 GHz and a minimum reflection loss value of -49.9 dB. Moreover, the synthesis process is simple and suitable for large-scale production and industrial applications. This facile route provides new ideas for designing graphene-based nanocomposites.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Anisoara Oubraham, Daniela Ion-Ebrasu, Felicia Vasut, Amalia Soare, Ioan-Sorin Sorlei, Adriana Marinoiu
Summary: This paper presents the preparation of platinum on a reduced graphene oxide matrix (PtrGO) using the microwave-assisted method with three different pH solutions. The platinum concentration determined by energy-dispersive X-ray analysis (EDX) was 4.32 (weight%), 2.16 (weight %) and 5.70 (weight%), corresponding to pH 3.3, 11.7 and 7.2, respectively. Pt functionalization of reduced graphene oxide (rGO) decreased the rGO specific surface, as shown by Brunauer, Emmett and Teller (BET) analysis.
Article
Energy & Fuels
Natarajan Sivakumar, Perumal Nagaraju, Ali Alsalme, Ali Alghamdi, Ramasamy Jayavel
Summary: The lanthanum ferrite decorated reduced graphene oxide nanocomposite prepared by in-situ microwave irradiation method exhibits enhanced electrochemical performance, with a specific capacitance of 170 Fg(-1), admirable cyclic stability, better Columbic efficiency, and improved capacitance retention, showing great potential for supercapacitor applications.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Physical
Chenxu Miao, Xianzhi Yin, Genglei Xia, Kai Zhu, Ke Ye, Qian Wang, Jun Yan, Dianxue Cao, Guiling Wang
Summary: The study shows that CoSe2/RGO composites exhibit excellent specific capacitance and durability, with the best performance achieved at 35.2 wt% RGO content. The hybrid supercapacitor using solid-state materials broadens the voltage window and enhances energy density.
APPLIED SURFACE SCIENCE
(2021)
Article
Electrochemistry
S. Jayasubramaniyan, S. Balasundari, Su Jeong Yeom, N. Naresh, T. Rani, E. Vijayakrishna Rapaka, N. Satyanarayana, Hyun-Wook Lee, P. Muralidharan
Summary: Supercapacitors are promising energy storage devices due to their long cycle stability, fast charge-discharge, and high power density, with the performance depending on the morphology and nanostructure of electrode materials. Materials with porous nanostructures are of interest for providing more active sites for reactions and facilitating utilization of active materials' full capacity.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Physical
Nannan Wang, Jun Wang, Jingjuan Zhao, Junhai Wang, Junqi Pan, Jiarui Huang
Summary: A nanosheet-like porous-carbon@reduced graphene oxide (PC@rGO) composite was prepared successfully via a facile method, showing high capacity and reversible capacity in Li-S batteries, indicating a promising direction for research on high energy density Li-S batteries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
T. Kavinkumar, N. Naresh, Georgeena Mathew, B. Neppolian
Summary: The study showed that porous reduced graphene oxide nanosheets serve as favorable nucleation sites for the growth of NiCo2O4 nanorods, resulting in a hybrid with superior specific capacity and high-rate performance. Assembled supercapacitors with NiCo2O4/RGO electrode demonstrated high energy density and long cycle life, and a flexible transparent supercapacitor device achieved large areal capacity, high energy density, and outstanding mechanical flexibility.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Talal F. Qahtan, Emre Cevik, Mohammed A. Gondal, Ayhan Bozkurt, Sultan Akhtar, Muhammad Hassan
Summary: A novel and green technique involving laser-induced photocatalytic reduction was developed to synthesize binder-free composite materials based on reduced graphene oxide (rGO) for flexible supercapacitors. The resulting supercapacitors demonstrated significant improvement in electrochemical performance due to the intrinsic characteristics of rGO such as high surface area, excellent electrical conductivity, and mechanical flexibility. The method is scalable, cost-effective, and can be used to produce all binder-free AC/rGO based composites for flexible energy-storage devices.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Zengyong Chu, Min Xiao, Qichao Dong, Guochen Li, Tianjiao Hu, Ye Zhang, Zhenhua Jiang
Summary: In this study, an efficient method was proposed to prepare ultrasensitive gas sensors based on porous reduced graphene oxide (PRGO) through photo-Fenton etching. The controlled etching enriched the vacancy defects of GO nanosheets and formed porous graphene oxide (PGO). The PGO was drop-coated on interdigital electrodes and hydrothermal reduced to achieve controllable reduction by varying the water amount. The gas sensor based on PRGO-5 min-6 h exhibited superior sensing and selective performance toward nitrogen dioxide (NO2), with an exceptional high sensitivity up to 12 ppm(-1) and a theoretical limit of detection down to 0.66 ppb. The excellent performance could be mainly attributed to the typical vacancy defects of PRGO, and the residue carboxylic groups on the edges facilitated the adsorption of polar molecules. The proposed process has great potential for scalable fabrication of high-performance NO2 gas sensors.
CHINESE CHEMICAL LETTERS
(2023)
Article
Chemistry, Physical
Ok-Kyung Park, Nam Hoon Kim, Joong Hee Lee
Summary: The study proposes a simple and effective one-pot hybrid reduction process for mass production of high-quality reduced graphene oxide (rGO) by simultaneously conducting deoxygenation and healing reactions. The newly formed sp(2)-hybridized C-C bond in the rGO surface significantly enhances its crystallinity, thermal stability, and electrical properties. The reduction of GO using microwave-irradiated thermal reduction with a carbon-source supplement proves to be a powerful approach for commercial mass production of high-quality rGO.
Article
Chemistry, Physical
Jie Sheng, Jingshan He, Dun Ma, Yuanbo Wang, Wu Shao, Tian Ding, Ronghao Cen, Jingwen He, Zhihao Deng, Wenjun Wu
Summary: This study presents an innovative approach to improve the photovoltaic conversion characteristics and stability of perovskite solar cells through carbon electrode interface modification. By in-situ polymerization and carbonization on the surface of nano-graphite, a dendritic structure carbon electrode is formed, reducing the work function and aligning the energy levels with perovskite. This leads to improved charge and hole collection efficiency, resulting in increased photovoltaic conversion efficiency. Furthermore, the modified carbon electrode-based perovskite solar cells exhibit exceptional stability, maintaining high efficiency even without encapsulation.
Article
Chemistry, Physical
Guodong Shi, Jian Song, Xiaoxiao Tian, Tongtong Liu, Zhanjun Wu
Summary: This study demonstrates the improvement of mechanical properties and reduction of coefficient of thermal expansion (CTE) in graphene oxide (GO)/epoxy (EP) nanocomposites by enhancing the interface between GO and EP through functionalization and incorporating rigid-flexible interphases. The results reveal that the SiO2-PEA-GO hybrid exhibits better strengthening and toughening effects, as well as lower CTE, compared to the PEA-GO hybrid due to the presence of rigid-flexible interfaces with higher bonding strength and better energy dissipation mechanisms. Additionally, the nanocomposites with longer polyetheramine (PEA) molecules in the rigid-flexible interphases demonstrate higher strength and toughness, while maintaining a lower CTE. This work provides a promising strategy for constructing adjustable flexible-rigid interfacial structures and offers potential in developing GO/EP nanocomposites with high mechanical properties and low CTE.
Article
Chemistry, Physical
Rafal Janus, Sebastian Jarczewski, Jacek Jagiello, Piotr Natkanski, Mariusz Wadrzyk, Marek Lewandowski, Marek Michalik, Piotr Kustrowski
Summary: In this study, a facile procedure for the synthesis of CMK-1 and CMK-2 carbon replicas was developed. The method utilizes basic laboratory equipment and a renewable carbon source, and operates under mild conditions. The resulting carbon mesostructures exhibit exquisite replication fidelity and structural homogeneity, making them suitable for applications in various fields.
Article
Chemistry, Physical
Anqi Wang, Connor J. MacRobbie, Alex Baranovsky, Jean-Pierre Hickey, John Z. Wen
Summary: In this study, a novel polymer-free nanothermite aerogel with a wide range of nanoparticle loading was fabricated via a new additive manufacturing process. The SEM images showed a unique porous structure formed by extra thin rGO sheets, wrapping individual nanothermite clusters. The DSC-TGA results and high-speed combustion videos confirmed the enhanced energetic performance of the printed specimen.
Article
Chemistry, Physical
Wanze Wu, Misheng Zhao, Shiwei Miao, Xiaoyan Li, Yongzhong Wu, Xiao Gong, Hangxiang Wang
Summary: Superhydrophobic solar-driven interfacial evaporator is an energy-efficient technology for seawater desalination, which is easily fabricated using robust photothermal superhydrophobic coating and substrate. The created bifunctional coating on the melamine sponge substrate shows stable and highly efficient photothermal and superhydrophobic performance for seawater desalination. This superhydrophobic solar-driven interfacial evaporator is expected to have wide applications in seawater desalination.
Article
Chemistry, Physical
Zichen Xiang, Zhi Song, Tiansheng Wang, Menghang Feng, Yijing Zhao, Qitu Zhang, Yi Hou, Lixi Wang
Summary: This study presents a co-electrospinning synthesis strategy to fabricate lightweight and porous Co@C composite nanofibres with wideband microwave attenuation capacity. The addition of MOF-derived Co additives enhances the low-frequency absorption performance.
Article
Chemistry, Physical
J. Snow, C. Olson, E. Torres, K. Shirley, E. Cazalas
Summary: This study investigates the use of a perovskite-based graphene field effect transistor (P-GFET) device for X-ray detection. The sensitivity and responsivity of the device were found to be influenced by factors such as X-ray tube voltage, current, and source-drain voltage. Simulation experiments were conducted to determine the dose rate and energy incident on the device during irradiation.
Article
Chemistry, Physical
Zuzana Jankovska, Lenka Matejova, Jonas Tokarsky, Pavlina Peikertova, Milan Dopita, Karolina Gorzolkova, Dominika Habermannova, Michal Vastyl, Jakub Belik
Summary: This study provides new insights into microwave-assisted pyrolysis of scrap tyres, demonstrating that it can produce microporous carbon black with potential application in xylene adsorption. Compared to conventional pyrolysis, microwave pyrolysis requires less time and energy while maintaining similar adsorption capacity.
Article
Chemistry, Physical
Max Bommert, Bruno Schuler, Carlo A. Pignedoli, Roland Widmer, Oliver Groning
Summary: A detailed understanding of the interaction between molecules and two-dimensional materials is crucial for incorporating functional molecular films into next-generation 2D material-organic hybrid devices. This study compares the energy level alignment of different-sized fullerenes on a Moire superstructure and finds that C-84 fullerenes can be either neutral or negatively charged depending on slight variations of the electrostatic potential. This discovery suggests a new path to achieve ambipolar charge transfer without overcoming the electronic gap of fullerenes.
Article
Chemistry, Physical
Yuanjing Cheng, Xianxian Sun, Ye Yuan, Shuang Yang, Yuanhao Ning, Dan Wang, Weilong Yin, Yibin Li
Summary: The dual-structure aerogel (GS) consisting of flexible silica fibers and graphene honeycomb structures exhibits excellent resilience, flexibility, and reliability. It also shows remarkable wave absorbing performance, making it an ideal candidate for microwave absorption applications such as flexible electronics and aerospace.
Article
Chemistry, Physical
Shuyu Fan, Yinong Chen, Shu Xiao, Kejun Shi, Xinyu Meng, Songsheng Lin, Fenghua Su, Yifan Su, Paul K. Chu
Summary: Graphene coatings are promising solid lubrication materials due to their mechanical properties. This study presents a new method for in situ deposition of high-quality graphene coatings on hard substrates using NiCo solid solution and competitive reaction strategies. The graphene coating deposited on substrates with deep NiCo solid solution demonstrates superior low-friction and durability.
Article
Chemistry, Physical
Mengdi Wang, Sanyin Qu, Yanling Chen, Qin Yao, Lidong Chen
Summary: The improved thermoelectric properties of conducting polymers are achieved by selectively capturing single-walled carbon nanotubes (SWNTs) in a conducting polymer film, leading to increased carrier mobility and reduced thermal conductivity. The resulting composite film exhibits significantly higher electrical conductivity and lower thermal conductivity compared to films with a mixture of SWNTs. This work provides a convenient and efficient method to enhance the thermoelectric properties of conducting polymers.
Review
Chemistry, Physical
Heng Wei, Weihua Li, Kareem Bachagha
Summary: This article reviews the research progress of carbon nanotube-based microwave absorbing materials (MAMs) in recent years, covering the fundamental theory, design strategies, synthesis methods, and future development directions.
Article
Chemistry, Physical
Chenguang Shi, Junlong Huang, Zongheng Cen, Tan Yi, Shaohong Liu, Ruowen Fu
Summary: This study developed a high-performance Li metal host material, which achieved dendrite-free Li deposition with a low nucleation overpotential and high Coulombic efficiencies through the combination of Ti3C2-g-PV4P sheets and Ag nanoparticles. The full cells assembled with the Li@host anode and LiFePO4 cathode exhibited high discharge capacity and excellent cycling stability, demonstrating a perspective design for future energy storage devices.
Article
Chemistry, Physical
Tomotaro Mae, Kentaro Kaneko, Hiroki Sakurai, Suguru Noda
Summary: A new partial prelithiation method for SiO/C-CNT electrodes was developed, which showed reduced irreversible capacity and achieved high energy densities with good reversibility. The method allows for precise control of the degree of prelithiation and is applicable to various chemistries.