Frontiers in Energy Research
·
2021
·
IF 4.008
Hu Lei,Yang Xulai,Chen Yumeng,Wang Lili,Li Jiajia,Tang Yujie,Zhang Haitao
TiNb2O7 (TNO) compound has been pursued tremendously due to its high theoretical capacity, high potential, and excellent cycle stability. Unfortunately, an intrinsic low electronic and ionic conductivity feature has restricted its broad applications in electrochemical energy storage fields. Two-dimensional (2D) nanostructures can effectively shorten Li-ion transport path and enhance charge transfer. Here, hierarchical structure TNO was constructed by using ethanol and acetic acid as particularly important organic chemicals of basic raw materials via a simple solvothermal reaction. Ethanol was found to play a critical role in the formation of 2D sheet structure. Meantime, reduced graphene oxide nanosheets can effectively improve electronic conductivity. As-obtained TiNb2O7 were wrapped further by graphene oxide nanosheets through a flocculation process. Their unique structure is beneficial to the final electrochemical performance. This study not only provides a general approach for the design of novel 2D nanomaterials wrapped by graphene because of the advantage of esterification reaction and flocculation reaction, but also improves the electronic and ionic conductivity simultaneously.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 3
·1308-1317
·
IF 3.925
Xuebin Hou,Zelong Huang,Liu Hu,Qufu Wei,Yi Hu
Construction of molybdenum phosphides (MoP) that are connected to conductive composite materials has been demonstrated to be an effective strategy for improving the activity of MoP, and it is crucial for both the hydrogen evolution reaction (HER) and lithium-ion batteries (LIBs). However, increasing the exposed active sites and simultaneously enhancing the synergistic effect between MoP and the conductive substrate is challenging. Herein, constructing a multi-hierarchical conducting connection based on carbon nanoparticles and reduced graphene oxide (rGO) sheets was proposed. MoP nanoparticles were in situ grown in a carbon matrix to form flower-like MoP/C particles and were well scattered in stable lamellar rGO nanosheets. Benefiting from the conductive network and good dispersion of active sites, the resultant MoP/C-rGO hybrid exhibits efficient HER activity, with Tafel slopes of 69 mV dec−1 and 87 mV dec−1 under acidic and alkaline conditions. Significantly, even when applied as an anode for LIBs, it demonstrates excellent storage performance with a high specific capacity and long-term stability. It displays superior cycle performance of a reversible capacity of 624.6 mA h g−1 at 0.5 A g−1 after 500 cycles. This work provides insight into the construction of multi-hierarchical structures for efficient bifunctional nanostructural electrodes for energy conversion and storage.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Xianhong Zheng,Jinhao Tang,Binbin Ding,Xinghua Hong,Qiaole Hu,Zhi Liu,Lihua Zou,Xiaoshuang Zhou,Peng Wang,Changlong Li,Wenqi Nie
Aqueous zinc-ion batteries (ZIBs) have emerged as a promising alternative to traditional lithium-ion batteries due to their high safety, environmental friendliness , and cost-effectiveness, as well as their high theoretical capacity. However, developing freestanding cathodes with excellent electrochemical performance , including high specific capacity and energy density , still faces significant challenges. Herein, we present a freestanding, flexible, and interfused V 2 O 5 nanowire/reduced graphene oxide (rGO) composite fiber nonwoven fabric for the cathode of aqueous ZIBs via a novel wet-spinning and wet-fusing assembly strategy. The resulting V 2 O 5 nanowire/rGO composite fiber nonwoven fabric can be directly utilized as the cathode for aqueous ZIBs, demonstrating outstanding electrochemical performance, including high specific capacity (402.5 mAh g −1 at 0.1 A g −1 ), energy density (286.3 Wh kg −1 at 71.4 W kg −1 ), excellent rate capability, and long cycling life (4000 cycles). This study provides new insights into the development of high-performance flexible freestanding electrode materials for ZIBs
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Tingting Zhu,Jinhang Yang,Yuxiang Shen,Ting Liang,Songyu Fan,Shiming Zhang,Zebin Yu,Shuangfei Wang,Yanping Hou
Z-scheme heterojunction photocatalysts can restrain carriers’ recombination while retaining high redox capacity. Herein, a novel ZnTe/rGO/WO 3 (ZRW) Z-scheme heterojunction was constructed for simultaneous removal of TC and Cu (II) from wastewater. The highly conductive rGO served as a bridge connecting the ZnTe and WO 3 whereby forming a tight interaction interface, beneficial to carriers transfer and separation. The removals of TC and Cu (II) using the optimized ZRW-10% achieved 90.6% and 89.5% within 150 min of light exposure, which were much higher than those from the ZnTe and WO 3 . Results of free radical trapping experiments and electron spin resonance analysis suggested that·O 2 - and·OH were the key active species for TC oxidation while e - dominated Cu (II) reduction. Based on the identified TC degradation intermediates, two possible degradation pathways for TC were proposed, and the ecotoxicity of most intermediates were less than TC. This study can advance research development of designing efficient Z-scheme photocatalyst and elimination of complex pollutants.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Wenkang Wang,Mengliang Hu,Zongtao Qu,Yao Dai,Kaixuan Chen,Shushen Lyu
Silicon suboxide (SiO x ) anodes have garnered significant attention from both academia and industry due to their superior theoretical capacity compared to graphite, as well as their improved capacity retention in comparison to pure silicon. Nevertheless, SiO x electrodes still confront the challenge of substantial volume expansion (>160 %) during the alloying process, resulting in electrode structural damage or even fragmentation and severely impacting cycling performance. Here, a three-dimensional (3D) conductive network was constructed by ethylenediamine (EDA) cross-linking reduced graphene oxide (rGO), which was encapsulated on the surface of SiO x spheres generated in situ via a magnesium thermal reduction reaction. Accordingly, the SiO x @rGO-EDA anode was prepared successfully with high reversible capacity (892 mAh g −1 after 100 cycles at 1 A g −1 ) and fascinating rate performance (447 mAh g −1 at 4 A g −1 ). In full cell, the SiO x @rGO-EDA anode also exhibits outstanding cycling stability (154 mAh g −1 after 100 cycles at 0.1C) and rate capability. The scanning electron microscopy (SEM) images captured from a top-view perspective indicate that the surface of SiO x @rGO-EDA electrode is smooth and dense without any noticeable cracks, and it maintains its structural integrity throughout the cycling process. The cross-sectional thickness of the electrode remains essentially the same. These results illustrate the superior structural stability of the EDA cross-linked graphene conductive network cladding structure, enabling it to adapt to dynamic changes and ensure efficient transport of lithium ions and electrons. The facile and versatile synthesis method of SiO x @rGO-EDA structures by incorporating cross-linking agents provides inspiration for the design of next-generation high-performance anodes.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yeqi Zhu,Chao Jin,Zhonghao Ning,Wenyan Huang,Shengjian Mao,Zhichao Xue,Siqi Lan,Qianwen Tao,Rongqian Yao
Actualization of well-balanced high porosity with simultaneous increase in hardness/fracture toughness for thermal insulation composites in hypersonic aerospace vehicle components is always of great challenge. Considering significant toughening effect of unique Mo 4.8 Si 3 C 0.6 -SiC composites microstructure, an agile strategy is proposed to prepare porous Mo 4.8 Si 3 C 0.6 /SiC(rGO) polymer-derived ceramics (PDCs) via re-pyrolysis of ball-milling-induced MoSi 2 -SiC(rGO) p /polycarbosilane-vinyltriethoxysilane-graphene oxide (PVG) precursors blends with polystyrene (PS) as pore-forming agent. In-situ formed Mo 4.8 Si 3 C 0.6 -β-SiC nanocrystals , possessing eminent mechanical properties and good compatibility with SiO x C y /C free , can significantly strengthen interface bonding and increase disorder of ceramic network. Such effective hindrance to crack propagation moderates the inherent brittleness while retaining high hardness of SiC PDCs. Moreover, dense Mo 4.8 Si 3 C 0.6 -β-SiC/SiO x C y /C free (rGO) framework, with spontaneous regular pore structure , well balances loading/thermal insulation capacity. Particularly, samples with 10 wt.% PS exhibit outstanding mechanical performances (hardness: 5.10 GPa; fracture toughness: 2.24 MPa·m 1/2 ; compressive strength : 58.15 MPa) and low thermal conductivity (0.8427 W·m - 1 ·K - 1 ). As demonstrated, products remain decent structural integrity after ablation of butane blowtorch flame for 1-20 min. The synergy oxidation with fast response of Mo 4.8 Si 3 C 0.6 and durability of β-SiC facilitates great anti-oxidation ability, opening up manufacture of SiC-based composites for thermal protection system (TPS) of hypersonic vehicles and re-entry spacecraft with ultra-high speed.
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yanyan Wang,Xian Zhang,Xin Ding,Ya Li,Bin Wu,Ping Zhang,Xiaoliang Zeng,Qian Zhang,Yuhang Du,Yi Gong,Kang Zheng,Xingyou Tian
Driven by the evolution of electronic packaging technology for high-dense integration of high-power, high-frequency, and multi-function devices in modern electronics, thermal management materials have become a crucial component for guaranteeing the stable and reliable operation of devices. Because of its admirable in-plane thermal conductivity, graphene is considered as a desired thermal conductor. However, the promise of graphene films has been greatly weakened as the existence of grain boundaries lead to a high extent of phonon scattering. Here, a stitching strategy is adopted to fabricate an rGO/g-C3N4 film, where 2D g-C3N4 works as a linker to covalently connect adjacent rGO sheets for expanding the size of graphene and forming an in-plane rGO/g-C3N4 heterostructure. The in-plane thermal conductivity of the rGO/g-C3N4 film reaches 41.2 W m–1 K–1 at a g-C3N4 content of only 1 wt %, which increased by 17.3% compared to pristine rGO. The interfaced thermal resistance between rGO and g-C3N4 is further examined by non-equilibrium molecular dynamics simulations. Furthermore, owing to the unique light absorption and welding ability of g-C3N4, the rGO/g-C3N4 film presents superior solar-thermal and electric-thermal responses to controllably regulate the chip temperature against overcooling. This work provides a facile approach to construct a large-sized rGO sheet and combines heat dissipation and heating capability in the same thermal management material for future electronics.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2021
·Vol. 13
·期 47
·5777-5786
·
IF 2.896
Jinyang Chen,Jiamei Wang,Ruihong Ye,Dihui Huang,Sheng Chen
The low conductivity of metal–organic frameworks seriously impedes their electrocatalytic performance. In this study, we prepared a fabricated sandwich structure composed of a Co-based zeolitic imidazolate framework (ZIF-67) and reduced graphene oxide (rGO) through a facile and simple one-pot hydrothermal reaction. This framework of nanocomposites, which are modified with a glassy carbon electrode, constructed a bisphenol A (BPA) electrochemical sensor for the first time. Operational parameters such as pH, electrolytes, the amount of modifiers, deposition potentials and deposition time were optimised for the sensitive detection of BPA. The performance of electrodes was evaluated by cyclic voltammetry, electrochemical impedance spectroscopy, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction and transmission electron microscopy. With differential pulse voltammetry, the detection concentration of BPA ranged from 0.05 μmol L−1 to 100 μmol L−1. The results revealed that the hierarchical nanocomposites demonstrated better electrocatalytic performance with large electrochemically active surface areas, high sensitivity and a low limit of detection (5.2 nmol L−1), compared with a physical mixture of ZIF-67 and rGO at the same ratio. These impressive features originate from the synergistic effects of ZIF-67 and rGO. This study presents a new strategy using metal–organic framework composite materials for the sensitive detection of BPA.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Scientific Reports
·
2021
·Vol. 11
·期 1
·1-12
·
IF 4.38
Tian Ying,Guo Ning,Wang Wen-Yi,Geng Wenming,Jing Li-Chao,Wang Tao,Yuan Xiao-Tong,Zhu Zeru,Ma Yicheng,Geng Hong-Zhang
Graphene oxide (GO), reduced graphene oxide (rGO) and carbon nanotubes (CNTs) have their own advantages in electrical, optical, thermal and mechanical properties. An effective combination of these materials is ideal for preparing transparent conductive films to replace the traditional indium tin oxide films. At present, the preparation conditions of rGO are usually harsh and some of them have toxic effects. In this paper, an SnCl 2 /ethanol solution was selected as the reductant because it requires mild reaction conditions and no harmful products are produced. The whole process of rGO preparation was convenient, fast and environmentally friendly. Then, SEM, XPS, Raman, and XRD were used to verify the high reduction efficiency. CNTs were introduced to improve the film conductive property. The transmittance and sheet resistance were the criteria used to choose the reduction time and the content ratios of GO/CNT. Thanks to the post-treatment of nitric acid, not only the by-product (SnO 2 ) and dispersant in the film are removed, but also the doping effect occurs, which are all conducive to reducing the sheet resistances of films. Ultimately, by combining rGO, GO and CNTs, transparent conductive films with a bilayer and three-dimensional structure were prepared, and they exhibited high transmittance and low sheet resistance (58.8 Ω/sq. at 83.45 T%, 47.5 Ω/sq. at 79.07 T%), with corresponding \({{\sigma_{dc} } \mathord{\left/ {\vphantom {{\sigma_{dc} } {\sigma_{opt} }}} \right. \kern-\nulldelimiterspace} {\sigma_{opt} }}\) values of 33.8 and 31.8, respectively. In addition, GO and rGO can modify the surface and reduce the film surface roughness. The transparent conductive films are expected to be used in photoelectric devices.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
·
2020
·
IF 3.57
Sittipranee Ploychompoo,Qianwei Liang,Xin Zhou,Chen Wei,Hanjin Luo
Contamination of drinking water with heavy metals, particularly arsenic (As), is a persistent problem with serious public health implications worldwide. In this study, we present a zinc based metal-organic framework (Zn-MOF-74) and polyacrylamide polymer (PAM) coated on reduced graphene oxide (rGO) as an effective adsorbent for the removal of arsenite (As(III)) from water. Zn-MOF-74 nanoparticles were prepared by room-temperature precipitation and these were immobilized on rGO surface grafted PAM by a free-radical polymerization method, (Zn-MOF-74/rGO/PAM nanocomposites). The experimental data correlates well with the pseudo-second-order kinetic model and Langmuir isotherm, and the maximum adsorption capacity ( q max ) was 282.4 mg g −1 at pH 10, 298 K. The removal efficiency was rapid, removing more than 99.8% of As(III) from a 0.2 mg L −1 solution and achieving drinkable levels in 15 min. Thermodynamic data revealed that the process was spontaneous and endothermic. Furthermore, the adsorbent revealed high stability in pH range 4–10 and could be reused at least four times. Adsorption mechanism involved a synergistic combination of chemisorption and physisorption. FTIR and XPS analyzes revealed that the amide group (–NH 2 ) and hydroxyl group (–OH) on Zn-MOF-74/rGO/PAM dominate in their adsorption.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 10
·1-10
·
IF 6.232
Cao Liangli,Xiao Haolin,Fang Cheng,Zhao Feijun,Chen Zhencheng
Using gold and magnetic nanoparticles co-decorated reduced graphene oxide-tetraethylenepentamine (rGO-TEPA/Au-MNPs) as the magnetic platform for capturing the primary antibody (Ab 1 ), separation and preconcentration of immunocomplex, a novel homogeneous electrochemical immunosensor was successfully developed. The newly prepared magnetic rGO-TEPA/Au-MNPs, compared with MNPs, exhibited better stability and enhanced electrical conductivity attributed to rGO-TEPA, and showed higher biorecognition efficiency due to AuNPs. In addition, Au@PtNPs were prepared and modified with secondary antibody (Ab 2 ) as an efficient signal probe for signal readout. Using carcinoembryonic antigen (CEA) as a model analyte, the prepared immunosensor demonstrated satisfactory properties like high stability, good repeatability and selectivity, wide linear range (5.0 pg mL −1 ~200.0 ng mL −1 ) as well as low detection limit (1.42 pg mL −1 ). The homogenous electrochemical immunosensor was applied to the detection of CEA in human serum and was found to exhibit good correlation with the reference method. Thus, the proposed rGO-TEPA/Au-MNPs-based homogenous immunoassay platform might open up a new way for biomarker diagnosis.
Graphical Abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yingshuang Song,Yusi Peng,Nguyen Viet Long,Zhengren Huang,Yong Yang
At present, there is an urgent need to develop a highly efficient adsorbent and photocatalyst with photodegradability under visible light for the removal of dye molecules in wastewater. Herein, the multifunctional three-dimensional Ag/g-C 3 N 4 /reduced graphene oxide aerogel (Ag/g-C 3 N 4 /RGOA) has been successfully prepared by a simple “one-pot” hydrothermal method , which exhibits three kinds of improved properties including excellent surfaced-enhanced Raman scattering (SERS) activity, highly efficient adsorption and photocatalytic activity. The composite aerogel presents 3D porous network structure. Importantly, the composite aerogel exhibits excellent adsorption and photocatalytic performance with adsorption rate of 44% and degradation rate of 93%. This is mainly attributed to the synergistic effect of Ag NPs, g-C 3 N 4 and RGO, which promotes the separation of photogenerated electrons and holes. In addition, the 3D porous network structure is conducive to the utilization of visible light and the transfer of photogenerated electrons. Furthermore, Ag/g-C 3 N 4 /RGOA exhibits excellent SERS activity with a detection limit of 1 × 10 −7 M for R6G molecules. The SERS performance has been utilized to monitor the process of adsorption and photodegradation of R6G by the composite aerogel. In this research, the designed multifunctional aerogel may become an attractive material for the detection and removal of dyes in wastewater.
✓ 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）