CARBON
·
2021
·
IF 9.594
Jingyi Zhang,Benwei Fu,Chengyi Song,Wen Shang,Peng Tao,Tao Deng
Mesoporous graphene and other carbon derivative nanospheres have attracted intensive research attention owing to their many unique characteristics and fascinating properties. However, facile synthesis of these mesoporous nanospheres with a small particle size and controllable morphology is still a grand challenge. Herein, we report a Kirigami-inspired approach to prepare mesoporous spherical graphene oxide (MSGO) particles through spray drying of holey GO sheets. By increasing pore size and porosity of the holey GO sheets, the spray-dried particles underwent the transition from rough crumpled structure to smooth spherical shape. The prepared MSGO particles have tunable diameters smaller than 200 nm and a high specific surface area of 503 m 2 /g, which enable consistent high-efficiency physical adsorption removal of organic dyes such as Rhodamine B from polluted water with a high adsorption rate of 335.6 mg/(g min). Moreover, the reported synthetic route provides the freedom to easily incorporate other functional nanoparticles such as TiO 2 , CuO or post-dope MSGO with nitrogen elements for construction of multifunctional composite particles with tailorable structures, which may enable a broad range of promising applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Environmental Science-Nano
·
2018
·Vol. 5
·期 12
·3004-3010
·
IF 6.087
Gaoliang Wei,Xie Quan,Chao Li,Shuo Chen,Hongtao Yu
Membranes have shown excellent performance in water treatment but still suffer from two important technical limitations—the compromise between permeability and selectivity, and membrane fouling. Empirical evidence suggests that ultrathin membranes may achieve the ultimate permeation and the preclusion of irreversible fouling. Considering the atomic thickness of graphene, we present for the first time a direct growth method of molecularly thin porous graphene membranes, through a synchronous thermal conversion and chemical etching process. Such graphene membranes allow for ultrafast water permeation, affording a permeance of up to 182 000 L m−2 h−1 bar−1, which is 2 orders of magnitude higher than that of conventional membranes, with a similar pore size of approximately 50 nm, and comparable to that of the reported state-of-the-art membranes. Additionally, much higher recalcitrance to irreversible fouling (in terms of higher flux recovery after a simple hydrodynamic flush) is observed, compared with polyvinylidene fluoride ultrafiltration membranes, during the filtration of engineered polystyrene nanoparticles and humic acid molecules. Both the high permeability and resistance to irreversible fouling of the graphene membranes can be attributed to their molecularly thin structure, perpendicular pore channels and appropriate surface chemistry.
研究领域:
材料科学
·
环境工程
·
纳米技术
✓ 已验证
DOI
高影响因子
RARE METALS
·
2022
·Vol. 41
·期 6
·2084-2093
·
IF 6.318
Cai Zhuo,Ma Yi-Fei,Wang Mei,Qian A.-Niu,Tong Zhao-Min,Xiao Lian-Tuan,Jia Suo-Tang,Chen Xu-Yuan
MXene has given great promises to supercapacitor electrode material due to its high conductivity and redox properties. However, the self-agglomeration of the MXene lamella will reduce its contact area with the electrolyte and generate a tortuous transportation pathway of the electrolyte ions, thereby reducing its capacitive performance and rate capability. In this work, we engineered the electrolyte ion channels by adjusting the MXene lamella size and inserting holey graphene (HG) nanosheets into the interlayer of the MXene flakes. The developed MXene/HG electrode can not only avoid the self-restacking of MXene but also provide unimpeded ion transport channels. As a result, the supercapacitive and rate performances of the small MXene lamella-based MXene/HG (S-MXene/HG) supercapacitor are prominently ameliorated. By adjusting the content of HG, the S-MXene/HG 0.05 electrode exhibits excellent gravimetric capacitance of 446 F·g −1 and a rate capability of 77.5%. The S-MXene/HG 0.05 -based symmetric supercapacitor provides an impressive energy density of 14.84 Wh·kg −1 with excellent cyclic stability of 96% capacitance retention after 10,000 cycles. This demonstration of the engineering of the ion channels shows great potential in two-dimensional material-based supercapacitor electrodes. Graphical abstract
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
You Zhou,Zhengyong Huang,Huijun Liao,Jian Li,Hanxiang Wang,Yu Wang
Graphene, as a family of 2D materials , can be used as film electrodes in energy storage devices because of its high surface area, electrical conductivity , and environmental stability. However, the pure graphene electrode attains aggregating nature, which significantly limits its practical application. To solve the overstacking problems, we construct a 3D porous reduced graphene (rGN) film by a novel and green Cu 2 O template-assisted route based on “coordinating etching and precipitating” process. Noticeably, a brand new material-NiCo 2 O 4 is generated when the template is removed by optimizing the coordinating etchant and the reaction conditions. It is observed that NiCo 2 O 4 perfectly imitates the shape of Cu 2 O template and has a hollow hydrangea-like structure. Furthermore, these emerging hollow NiCo 2 O 4 hydrangeas not only prevent the re-accumulation of sheet layers, but also afford 3D porous structure for film, and greatly enhance the energy storage properties on account of the pseudocapacitance of NiCo 2 O 4 . The 3D graphene/NiCo 2 O 4 film (3D rGN/NiCo 2 O 4 ) exhibits high specific capacity of 708.36 F g −1 at 1 A g −1 , remarkable rate performance of 582.11 F g −1 even at 16 A g −1 , and superior circulation ability with 94.3% capacitance retention after 6000 cycles at 10 A g −1 , indicating the potential applications in energy storage.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Shucheng Wu,Lili Xiao,Zhenzhen Du,Haoqiang Wang,Qunhui Yuan,Hengxing Ji
In this study, an activated porous graphite oxide (PG) with a superior surface area of ~ 3010 m 2 g − 1 was applied as electrode component for discrimination of dopamine (DA) and uric acid (UA) via cyclic voltammetry (CV), in the presence of high content of ascorbic acid (AA). Contributable to microwave exfoliation and KOH assisted activation, the as-prepared PG remarkably improves the signal at glassy carbon electrode (GCE) for analyte. The electrochemical performance of PG/GCE was studied with CV and electrochemical impedance spectroscopy (EIS) measurements. The CV data implied that the PG film effectively enlarges the electro-active area of the working electrode while the EIS data revealed that the PG modification enhances the electron transfer kinetics between analyte and electrode. The peak separations between DA, UA and AA were remarkably enlarged and their redox peak currents were enhanced. This makes the proposed sensor feasible for simultaneous determination of DA and UA in the presence of AA. Under optimum conditions, the oxidation peak currents for DA and UA increased linearly over concentration ranges of 0.5–60 μM and of 0.5–100 μM, with detection limits of 0.04 μM and 0.02 μM (at a signal-to-noise ratio of 3, S/N = 3), respectively. Applications of the PG/GCE for urine and serum analyses were investigated. The results with good recoveries indicate the feasibility of the developed electrode in clinic sensing application.
研究领域:
分析化学
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材料科学
·
生物医学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Micun Yun,Yifei Ma,Zhuo Cai,Haomin Ji,Jiemin Han,Mei Wang,Zhaomin Tong,Liantuan Xiao,Suotang Jia,Xuyuan Chen
A composite of Co 3 O 4 /holey graphene (Co 3 O 4 /HG) was prepared via a facile hydrothermal route, and was then processed into an electrode by an electrophoretic deposition process. Holey graphene (HG) wrapped Co 3 O 4 to form a 3D skeleton network, thereby providing high electrical conductivity , and the holes in HG could further shorten the electrolyte ion diffusion pathway. Therefore, by adjusting the mass ratio of Co 3 O 4 to HG, the Co 3 O 4 /HG composite afforded an enhanced capacitance of 2714 F g −1 (at a current density of 1 A g −1 ), which is 20 times higher than that of pure Co 3 O 4 . To further explore the practical applications of Co 3 O 4 /HG, a symmetric supercapacitor employing Co 3 O 4 /HG was fabricated. The supercapacitor functioned stably at potentials up to 1.2 V, with an enhanced energy density of 165 Wh kg −1 and a high power density of 0.6 kW kg −1 at 1 A g −1 .
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Xiaohua Zhu,Yong Liang,Xiaoxi Zuo,Ruiping Hu,Xin Xiao,Junmin Nan
A novel graphene-based nanomaterial , multi-nanopore graphene (mp-GR), modified glassy carbon electrode (mp-GR/GCE) is prepared for the simultaneous determination of dopamine (DA) and uric acid (UA) in the presence of ascorbic acid (AA). After a hydrothermal reaction of the graphene oxide in the presence of H 2 O 2 at 180 °C for 2 h, the water-soluble mp-GR is obtained from the hydrothermal suspension. This mp-GR exhibits abundant carboxylic and/or hydroxide groups, edges, and defective sites due to the reaction and structure disruption caused by the hydrothermal treatment . The mp-GR appears an enhanced electrocatalytic activity toward DA and UA due to the unique structure and composition . The oxidation peak current of DA at the mp-GR/GCE is about 2.70 and 8.61 times higher than at the GR/GCE and the GCE, respectively. Using the mp-GR/GCE, the simultaneous differential pulse voltammetry determination of DA and UA in the presence of AA is successfully carried out, the detection limits (S/N = 3) for DA and UA are 1.5 × 10 −6 mol L −1 and 2.0 × 10 −6 mol L −1 , respectively. In addition, this mp-GR/GCE exhibits high selectivity, reproducibility, and stability, and also can detect DA and UA in real human blood serum, showing its promising application in the electroanalysis of real samples.
研究领域:
分析化学
·
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2017
·
IF 4.075
Yiwei Zheng,Xiaoxia Wang,Shuang Wei,Baoqin Zhang,Mingxun Yu,Wei Zhao,Jingquan Liu
Graphene is a promising lightweight microwave absorption (MA) absorber, but the limited dielectric loss and nonmagnetic characteristic have impeded its further applications. Through the structure modification, porous (1–2.5 μm) graphene was successfully prepared via a simple pyrolysis process, and the minimum reflection loss (RL) value reached −48 dB at 9.8 GHz, which demonstrated that porous graphene (PG) showed outstanding MA performance than the ordinary graphene (OG). In order to strengthen the magnetic loss, and then boost the impedance matching, Fe 3 O 4 nanoparticles (∼10 nm) were deposited uniformly on the surface of PG via in situ precipitation to synthesize porous graphene-Fe 3 O 4 (PG-Fe 3 O 4 ) composites. It was found that the as-prepared PG-Fe 3 O 4 composites showed especially high MA performance, and the minimum RL of −53.0 dB was achieved at 5.4 GHz with the thickness of 6.1 mm. The absorption bandwidth of RL less than −10 dB was from 12.6 to 18.0 GHz (5.4 GHz) with a thin thickness of 2.7 mm. The excellent MA properties of PG-Fe 3 O 4 composites were the consequence of the perfect impedance matching, porous structure as well as the multi-polarization. These results demonstrated that the PG-Fe 3 O 4 composites with excellent MA properties and lightweight should be promising absorbers for practical applications.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Xiuxian He,Zheng Tang,LianLian Gao,Fangyuan Wang,Jinping Zhao,Zhichao Miao,Xiaozhong Wu,Jin Zhou,Yang Su,Shuping Zhuo
Engineering graphene with efficient ion and electron transport properties is vital for development of high performance, next generation energy storage devices. The protocols generally involve pore generation and doping of graphene with the heteroatoms. Herein we report the realization of pore generation, control, and N-doping of graphene in one single process using reduced metal salt as etching agent and environment friendly N 2 gas as doping agent. Furthermore, we found the porous structure (pore size and density), the dopant bonding configuration and doping amount can be controlled by change the metal salt and nitrogen source, which allows us to investigate the influence of pore and N-doping structure of porous graphene (PG) in their supercapacitor performance . Specifically, the N-doping, PG prepared by Ni salt (PG-Ni) shows the smaller pore size (average pore size of ~20–30 nm) and larger pore density. PG-Ni exhibits high specific capacitance of 575 F/g along with the energy density of 51.2 Wh/kg at 0.5 A/g current density and also shows good rate, cycling performances. Considering the excellent performance, ease of the process, and pore structure controllability, we believe the method provides a new route for developing graphene based high performance supercapacitors.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Xiaozhong Zhou,Xiaoyan Zheng,Hejie Lu,Hongling Deng,Zheyi Liu,Jiangwei Deng
Antimony oxides are of great promise for lithium storage due to their high theoretical capacity, but low intrinsic conductivity and large volume change during lithium-ion insertion/extraction lead to inferior cycling stability. Herein, Sb 6 O 13 nanocrystals were successfully embedded in three-dimensional (3D) honeycomb-like reduced holey graphene oxides (HrGO) sheets by H 2 O 2 -assisted solvothermal method, and the as-synthesized Sb 6 O 13 /HrGO composite was demonstrated to deliver superior electrochemical lithium-storage performance. During the preparation process, graphene oxides (GO) sheets were pretreated with H 2 O 2 to boost formation of in-plane nanoholes, which play crucial roles in both constructing Sb 6 O 13 /HrGO with unique 3D honeycomb-like structure and boosting lithium-storage kinetics. 3D interconnect HrGO sheets with honeycomb-like structure construct a stereoscopic conductive network skeleton for fast electron transfer and alleviating volume expansion of active components during charging/discharging process. Moreover, abundant in-plane nanoholes enable lithium ions to migrate cross graphene sheets, resulting in shortening diffusion distance and fastening diffusion kinetics. Thus, Sb 6 O 13 /HrGO electrode exhibited a high reversible capacity of 956.1 mA h g −1 (200 mA g −1 ) based on conversion-alloying mechanism and superior high-rate capability (493.4 mA h g −1 at 1000 mA g −1 ) for lithium storage. This work provides a facile, environmental-friendly and scalable strategy to fabricate composites with special structures for high-rate energy storage.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Zahira Bano,Muhammad Akram,Naveed Zafar Ali,Muhammad Usman Khan,Fengyun Wang,Linrui Li,Mingzhu Xia
In this research, a novel composite of maleic acid derived 3D porous graphene and zeolatic imidazolate framework (ZIF-67) was developed by using one step in-situ preparation method. The synergistic impact of ZIF-67 embedded on 3D porous graphene network enhances the adsorption capacity of the organic dyes (Congo Red and Methylene Blue). The obtained structured composite material possesses macroporous and mesoporous channels up to 14.42 nm with enhanced morphological stability. The resultant 3DPGZF composite exhibits the maximum adsorption capacity towards the CR (589.46 mg g −1 ) and MB (350.79 mg g −1 ), with a removal rate of 100 % within 50 min. The kinetic study and isothermal analysis showed that pseudo second-order-kinetic model and non-linear form of the Freundlich isotherm model were more fitted with adsorption data. The adsorption of CR and MB occurred spontaneously and exhibited an endothermic nature. The DFT studies and characterization after utilization of the composite demonstrated that electrostatic attractions, pi-pi interaction, pore filling and surface binding reactions were the primary forces of the sorption process. The after adsorption XPS, FTIR, TEM and XRD results revealed that the prepared composite 3DPGZF is highly stable and was successfully regenerated multiple times without deforming its internal structure and morphology.
研究领域:
材料科学
·
环境科学
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2018
·Vol. 25
·期 2
·573-581
·
IF 2.347
Zhang Chengyi,Zhang Wen,Mu Yingxin,Fang Feifei,Huang Chengde,Wang Yuxin
In this work, a novel holey graphene oxide bonded with sulfonic acid groups (S-HGO) was developed using a facile and eco-friendly strategy: erosion and oxidation of graphene oxide (GO) by H 2 O 2 and sulfonation by 4-benzenediazoniumsulfonate. The freestanding paper fabricated by S-HGO shows a high proton conductivity of 4.97 × 10 −2 S cm −1 at 60 °C and 100% relative humidity (RH), which is comparable to Nafion 115 (7.67 × 10 −2 S cm −1 ) at the same condition. The holes on S-HGO provide shortcut channels for proton transfer across the GO nanosheet. The chemical-linked sulfonic acid groups afford additional hop sites for proton conduction and endow itself an enhanced thermostability. Under 100% RH and ambient pressure, the freestanding S-HGO deliver a peak power density of 103 mW cm −2 at a load current density of 273 mA cm −2 , which is about three times more than that of GO at 35 °C. The results demonstrate that this S-HGO paper is a promising nanoscale inorganic material for proton exchange membranes.
研究领域:
材料科学
·
能源科学
✓ 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）