RSC Advances
·
2016
·Vol. 6
·期 91
·88897-88903
·
IF 3.289
Na Wang,Xiaofeng Li,Jing Yang,Yuxia Shen,Jin Qu,Song Hong,Zhong-Zhen Yu
To enhance the recyclability while maintaining the high efficiency for the removal of organic dyes, monolithic polyurethane@reduced graphene oxide@manganese dioxide (PU@RGO@MnO2) hybrid sponge with a hierarchical structure and satisfactory flexibility is fabricated by self-assembly of RGO on a PU sponge followed by uniform coating of MnO2 nanoparticles onto RGO by means of an in situ redox reaction between RGO and KMnO4. RGO acts as an ideal substrate to accommodate MnO2 nanoparticles and prevents their aggregation, whereas the numerous hydrophilic MnO2 nanoparticles play dual roles of adsorption and catalytic degradation of methylene blue (MB) dye. The resultant hybrid sponge shows a hierarchical porous structure that provides fast transport channels and abundant active sites, benefiting the diffusion and removal of MB. By enhancing the mass transfer with the help of a micro-pump, the monolithic hybrid sponge acts as a filter for dye removal. Under the dynamic mode, the adsorption efficiency of the PU@RGO@MnO2 hybrid sponge for MB (50 ppm, 30 mL) reaches 94% after 20 min, whereas it is as low as 5% under the static mode. With the assistance of H2O2, the removal efficiency of the hybrid sponge is 96% at first time under the dynamic mode, whereas it is only 14% in the static mode. The monolithic hybrid sponge is highly efficient in adsorption and catalytic degradation of MB based on an adsorption–oxidation–desorption process. Even after being used 4 times, it still maintains excellent removal efficiency and recyclability.
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WATER AIR AND SOIL POLLUTION
·
2015
·Vol. 226
·期 11
·1-12
·
IF 1.554
Ahmad Ayyaz,Gu Xiaogang,Li Li,Lu Shuguang,Xu Yisheng,Guo Xuhong
In this study, nanosized zero-valent iron-reduced graphene oxide (nZVI-rGO)-activated persulfate (PS) was used to investigate the generation of reactive oxygen species (ROS) for the degradation of trichloroethylene (TCE) in the aqueous solution. More than 98 % of TCE was degraded within 2 min under experimental conditions. The generation of ·OH increased when the pH was shifted toward the basic region while ·SO 4
− radicals’ intensity increased in the acidic pH. Different scenarios have been observed in ·O 2
− generation in the neutral and strong basic pH and decreased in acidic or slightly basic pH. In addition, the intensity of ·OH was increased with the addition of HCO 3
− (10 mM) and NO 3
− (100 mM) but decreased in the presence of Cl − (10 and 100 mM), HCO 3
− (100 mM), and NO 3
− (10 mM). The degradation of anisole, probe for both ·OH and ·SO 4
− , was slightly enhanced by 10 mM NO 3
− anions but decreased in 100 mM salt solution. ·O 2
− intensity was increased while HCO 3
− (10 and 100 mM) and NO 3
− (100 mM) anions were used. nZVI-rGO-activated PS process could remove TCE in aqueous effectively, and the ROS generation and intensity were influenced by solution pH values and anions.
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TALANTA
·
2014
·
IF 3.511
Qing Han,Xi Wang,Zaiyue Yang,Wanying Zhu,Xuemin Zhou,Huijun Jiang
Based on magnetic field directed self-assembly (MDSA) of Fe 3 O 4 @rGO composites, a novel magnetic molecularly imprinted electrochemical sensor (MIES) was fabricated and developed for the determination of the azo dye amaranth . Fe 3 O 4 @rGO composites were obtained by a one-step approach involving the initial intercalating of iron ions between the graphene oxide layers via the electrostatic interaction , followed by the reduction with hydrazine hydrate to deposit Fe 3 O 4 nanoparticles onto the reduced oxide graphene nanosheets . In molecular imprinting, the complex including the function monomer of aniline, the template of amaranth and Fe 3 O 4 @rGO was pre-assembled through π–π stacking and hydrogen bonding interactions, and then was self-assembled on the surface of magnetic glassy carbon electrode (MGCE) with the help of magnetic field induction before electropolymerization. The structures and morphologies of Fe 3 O 4 @rGO and the doped molecularly imprinted polymers (MIPs) were investigated by Fourier transform infrared spectrometer (FT-IR), Raman spectra and scanning electron microscope (SEM). Besides, the characterization by differential pulse voltammetry (DPV) showed that Fe 3 O 4 @rGO composites promoted the electrical conductivity of the imprinted sensors when doped into the MIPs. The adsorption isotherms and adsorption kinetics were employed to evaluate the performances of MIES. The detection of amaranth was achieved via the redox probe K 3 [Fe(CN) 6 ] by blocking the imprinted cavities, which avoided the interferences of oxidation products and analogs of amaranth. Furthermore, the prepared MIES exhibited good sensitivity, selectivity, reproducibility and efficiency for detecting amaranth in fruit drinks. The average recoveries were 93.15–100.81% with the RSD <3.0%.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Jia Miao,Meifen Huang,Wenlong Sun,Zhehui Weng,Qiong Wu,Tongtong Gui,Qiong Xu,Xiangying Li,Haijun Pang
Sodium-ion batteries (SIBs) have gained increasing attention as a promising alternative to lithium-ion batteries, owing to the abundance and low cost of sodium. However, despite these advantages, the performance of SIBs is hindered by the larger ionic radius of sodium, which not only reduces ion migration rates but also significantly lowers the specific capacity. To address this challenge, the present study explores the synthesis of Na 5 PV 2 Mo 10 O 40 (PV 2 Mo 10 )-modified reduced graphene oxide (rGO) composites by employing imidazole ionic liquid (IL) as electrostatic attraction agent, this approach not only prevents the aggregation of polyoxometalates (POMs) but also increases the interlayer distance of rGO, improving the battery’s specific capacity and enhancing the diffusion rate of Na + ions. Experimental results indicate that the PV 2 Mo 10 -rGO-IL hybrid material exhibits exceptional electrochemical properties, characterized by significantly improved conductivity and an impressive specific capacity of 290mAh g −1 while achieving nearly 100 % Coulombic efficiency over 900 cycles. Furthermore, theoretical calculations reveal that the incorporation of POMs effectively reduces the electrode impedance of rGO and enhances the structural stability of POMs during cycling. This study opens up new avenues for the design of high-performance sodium ion batteries based on POMs.
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MRS Energy & Sustainability
·
2024
·
IF 3.3
Oubla M’hamed,Idrissi Siham,Edfouf Zineb,Dinia Selma,Elouadi Brahim
Abstract The growing request of enhanced lithium-ion battery (LIB) anodes performance has driven extensive research into transition metal oxide nanoparticles, notably Fe 3 O 4 . However, the real application of Fe 3 O 4 is restricted by a significant fading capacity during the first cycle, presenting a prominent challenge. In response to this obstacle, the current research centers on the development of Fe 3 O4@rGO (with rGO is reduced graphene oxide) nanocomposite through a new two-step soft sol–gel method, incorporating a slight proportion of rGO. This targeted approach aims to resolve issues linked to the electrochemical stability of Fe 3 O 4 anode. The structure and morphological characterizations techniques confirmed the spinel crystalline structure of Fe 3 O 4 as well as the distinctive aggregate morphology of the nanoparticles, highlighting a regular arrangement of rGO-coated nanoparticles. The lithium-ion storage properties of the Fe 3 O 4 @rGO anode were examined through exhaustive electrochemical analyses. A minor irreversible capacity stands out as a particularly noteworthy feature in the Fe 3 O 4 @rGO anode. This characteristic is of paramount interest, given that the anode exhibits high specific capacity along with a high cycling stability and an outstanding rate capability. These remarkable outcomes can be directly linked to the superior morphological characteristics attained through the two-step sol–gel method. Graphical Abstract
Highlights
The Fe 3 O 4 @rGO nanocomposite, resulting from a novel two-step mild sol–gel method, exhibits a unique and promising structure for LIB technologies.
Regarding storage performance as an anode, the prepared nanocomposite exhibited a minor irreversible capacity, high reversible capacity, as well as good coulombic efficiency.
The incorporation of rGO improved the electrical conductivity and played a crucial role in facilitating Li-ion diffusion, overcoming challenges associated with volume changes during the cycling process.
Discussion
Transition metal oxide (TMO)-based anodes hold promise for future LIB technologies owing to their substantial theoretical capacities. However, the material’s tendency to expand dramatically during use, leading to electrode deterioration and capacity fade. To address this challenge, researchers have explored incorporating rGO into TMO composites.
rGO’s unique properties, including high conductivity and mechanical flexibility, effectively mitigate volume expansion and enhance electrochemical performance. The two-step soft sol–gel method could be a promising solution for fabricating rGO-TMO nanocomposites. However, further optimization and large-scale fabrication are necessary for practical applications.
Despite these challenges, the combination of TMOs and rGO could create high-performance and durable anodes for LIB. Further research should focus on optimizing material composition and fabrication processes to realize the full potential of this technology.
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OPTICAL MATERIALS
·
2024
·
IF 3.8
Liguo Wei,Xiaohu Xu,Lishuang Zhao,Junyun Liu,Run Wang,Xindan Zhang
To improve the photovoltaic performance of the traditional TiO 2 photoanode for dye-sensitized solar cells (DSSCs), a series of layered TiO 2 /rGO composited DSSCs photoanode was assembled by changing the morphologies of the TiO 2 and introducing reduced graphene oxide (rGO) into different areas of the photoanode films. Firstly, TiO 2 nanoflowers (TiO 2 -NFs), TiO 2 nanorods (TiO 2 -NRs) were prepared employing the hydrothermal method and used as photoanode materials to explore the synergistic effect of TiO 2 with different morphologies in layered photoanode. Then, TiO 2 -NFs/rGO composited photoanode (TNF/rGO) were fabricated to research the mechanism of rGO on improving electron transmission in the layered photoanode. The effect of adding rGO at different parts of the layered photoanode on the performance of DSSCs was also investigated. Attributing to the enhancement of light absorption and charge transfer, a champion power conversion efficiency ( η ) of 9.21 % ( J sc = 23.36 mA cm −2 , V oc = 0.74 V, FF = 0.53) was achieved with the layered TiO 2 /rGO composited photoanode containing two consecutive layers of TiO 2 -NFs/rGO and P25/rGO, which exhibited an 82.01 % increase than traditional TiO 2 (pure P25) photoanode ( η = 5.06 %, J sc = 12.09 mA cm −2 , V oc = 0.73 V, FF = 0.58). It is an effective way to design and fabrication of layered TiO 2 /rGO composited photoanode to regulate the photovoltaic performance of traditional TiO 2 photoanode for DSSCs based on the synergistic effect of its multi-layer structure, TiO 2 morphologies and introduction of rGO.
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CARBON
·
2024
·
IF 10.5
Runze Feng,Mingnv Guo,Zhongqing Yang,Jiaqi Qiu,Ziqi Wang,Yongliang Zhao
The photothermal-catalyzed CO 2 reduction is severely limited by the low carrier transport capacity. In this paper, the in-situ construction of 0D/2D Bi 2 MoO 6 (BMO)/reduced Graphene Oxide (rGO) heterojunction was synthesized. The excellent photothermal conversion ability of rGO promotes the high dispersion of BMO quantum dots (QDs). The size of synthesized BMO QDs is about 4.26 nm and the temperature of the catalysts can quickly rise to 68.0 °C. XPS results show that the C–O–Bi interfacial electronic bridge between surface oxygen-containing groups and BMO QDs was successfully induced by modulating the degree of GO reduction. Electrons generated by BMO QDs migrate to the rGO surface rapidly, inducing rGO as a new electron-rich surface for rapid activation of CO 2 . The 1:5 BMO/rGO (NaBH 4 ) CO yield reaches 186.87 μmol/g, which is 4.64 times as much as BMO QDs.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Siyu Liu,Xingmin Liu,Xiaoyu Cui,Mingwei Zhu,Shaowei Lu
3D direct ink writing technology based on two-dimensional (2D) MXene nanomaterial inks receives attention in the field of pressure sensing for simplicity of fabrication, programmable geometry with controllable function and performance. However, it is still a huge challenge to print excellent macro-structure with ultralow-concentration MXene inks, attributed to its weak gelation ability. Herein, we construct a MXene/reduced graphene oxide (MX/rGO) architecture (0.012 g cm −3 ) with macroscopic (hierarchical lattice) and microscopic (porous) structure by using ultralow-concentration emulsion-based inks of MXene (5.882 mg mL −1 ). The introduction of octadecylamine enhances the bonding between the MXene and GO, significantly improving the gelation ability of the ink with low-concentration 2D nanomaterials. More importantly, the MX/rGO pressure sensor achieves a high sensitivity (166.957 kPa −1 ), wide sensing range (0.028∼100 kPa), and excellent cyclic stability (10500 cycles) due to its 3D hierarchical lattice porous structure. These sensing capabilities enable the sensor to detect various human motions, such as pulse beating, vocal cord vibration, facial expressions, different joint movements and pressure distribution. Undoubtedly, this work provides a broad development prospect for the customized flexible pressure sensors based on MXene ink 3D printing technology.
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Journal of Energy Storage
·
2025
·
IF 9.8
Wenjing Chen,Lan Jiang,Xiaowu Hu
Phase change material (PCM) is a promising energy material for applications, but their inherent drawbacks, such as poor thermal conductivity and vulnerability to leakage, strongly limit their use in efficient energy storage and thermal management. To overcome these drawbacks, this paper innovatively uses a high-temperature one-step reduction method to simultaneously prepare Ag particles and reduced graphene oxide (rGO) and carbonize melamine foam (CMF) to improve thermal conductivity as well as photo-thermal conversion, and ultimately a series of shape-stable thermally conductive reinforced composite phase change material (CPCM) are prepared using vacuum impregnation. The high-density three-dimensional thermal conductivity network of Ag@rGO-CMF was able to significantly increase the thermal conductivity of CPCM (up to 104.2 % enhancement). The prepared CPCM have high loading ratios (96.9 % ~ 97.8 %), high enthalpies (154–157.7 J/g), high photo-thermal conversion efficiencies (81.3 % ~ 90.5 %), and excellent thermal management capabilities of electronic devices. This study provides a simple and feasible method for the preparation for high performance CPCM.
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MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Hao Tian,Jie Ma,Bai Yang,Ran Li,Ronghai Yu
It is necessary to broaden absorption bandwidth, regulate applied frequency, reduce the weight and maintain strong absorption for magnetic microwave absorbing materials by constructing suitable material structures to satisfy the requirements for wide applications in various electromagnetic devices. In this work, well-structured amorphous-Co@Nd(BO 2 ) 3 /rGO nanocomposites have been fabricated using a selective chemical reduction in a mixed aqueous solution containing Co 2+ and Nd 3+ ions along with GO sheets reduced by NaBH 4 as the reductant, in which only Co 2+ and GO but no Nd 3+ ions were reduced. Very low coercivity of 0.4 Oe is achieved in amorphous-Co@Nd(BO 2 ) 3 /rGO nanocomposites due to amorphous Co@Nd(BO 2 ) 3 core-shell nanoparticles uniformly anchored on rGO sheets. These soft magnetic rGO-based nanocomposites exhibit high-frequency microwave absorption performance including a minimum reflection loss ( RL min ) value of −84.09 dB at 15.38 GHz for a 2.1 mm thickness at an applied frequency range (12.31–18 GHz) covering almost the entire Ku band. Moreover, a much wider absorption band of 7.24 GHz (10.67–17.89 GHz, RL ≤ −10 dB) with a 2.3 mm thickness along with a RL min value of −35.92 dB is also achieved. These rGO-based magnetic composites also show good structural stability , low density and easily controlled material compositions along with facile chemical fabrication suitable for mass production, which promises their latent use in high-performance microwave absorbing devices. Crystallization behavior of a new amorphous Nd(BO 2 ) 3 phase was also investigated.
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ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Junhua Lu,Hedong Jiang,Pingchun Guo,Jiake Li,Hua Zhu,Xueyun Fan,Liqun Huang,Jian Sun,Yanxiang Wang
In recent years, significant progress has been made in the development of supercapacitors (SCs) for high-power applications, including electric vehicles, consumer electronics, military, and industrial uses. One crucial research area focuses on enhancing the electrochemical properties of SCs through the development of superior electrode materials. A composite electrode material (CuS/Cu 2 S/rGO) that combines Cu-sulfur compounds and graphene has been synthesized using the continuous ion layer adsorption (SILAR) method on reduced graphene thin films (rGO). The CuS/Cu 2 S/rGO film SC demonstrates exceptional electrochemical properties, attributed to the synergistic effect of CuS, Cu 2 S, and rGO. At a current density of 0.5 A g −1 , the mass-specific capacitance reaches 355.70 F g −1 , with a high energy density of 49.40 Wh kg −1 and a peak power density of 8511.49 W kg −1 . Even at an increased current density of 5 A g −1 , the mass-specific capacitance remains impressive at 239.62 F g −1 , indicating excellent rate performance. Furthermore, after 1000 constant current charge and discharge cycles, the material maintains a capacity retention rate of 87.13 %, underscoring its robust cycling stability.
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Nano Research
·
2024
·
IF 9.5
Guo Chan,Shao Shiping,Zhang Xin,Tang Yunxiang,Wang Luxue,Liu Jiurong,Wu Lili,Bi Ke,Wang Fenglong
Aerogel-based composites hold promising application prospects as potential electromagnetic wave (EMW) absorption materials, yet the construction of such materials with ingenious microstructures, appropriate magnetic/dielectric multi-components, and integrated multifunctionality remains considerably challenging. Herein, a multicomponent Co/MnO/Ti 3 C 2 T x MXene/rGO (CMMG) hybrid aerogel featured with three-dimensional (3D) vertical directional channel architecture is reported. Benefiting from the synergistic effect arising from the 3D conductive networking structure, diverse heterogeneous interfaces, magnetic/dielectric multicomponent, and multiple loss pathways, the optimized CMMG-2 aerogel delivers fascinating EMW absorption capabilities, characterized by a minimal reflection loss (RL min ) of −77.41 dB and an effective absorption bandwidth (EAB) of 6.56 GHz. Additionally, the remarkable hydrophobicity, exceptional thermal insulation capabilities, and outstanding photothermal properties of CMMG-2 aerogel make it highly promising for multiple application in diverse and demanding environments. Interestingly, the distinctive pore structure of hybrid aerogel also allows it for sensitive and reliable detection of electrical signals caused by pressure changes and human motion. Thus, this research provides a viable design strategy for the development of lightweight, efficient, and multifunctional aerogel-based EMW absorption materials for various application scenarios.
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