BIORESOURCE TECHNOLOGY
·
2021
·
IF 9.642
Cheng Wang,Xi Chen,Yingying Jiang,Na Li,Ping Zhu,Hong Xu
Facile and green fabrication of reduced graphene oxide on loofah sponge (rGOLS) carrier was applied for cell immobilization of ε-Poly- l -lysine (ε-PL) production. Due to surface properties including large specific surface area, high polarity, and low interaction energy, rGOLS-1 was employed as the optimum rGOLS to enhance immobilization of Streptomyces albulus . Compared with raw LS, batch experiments showed rGOLS-1 facilitated superior cell vitality for ε-PL production due to the presence of reduced graphene oxide. In the sequential fed-batch cultivation of Streptomyces albulus using rGOLS-1 with an aerobic plant fibrous-bed bioreactor (rGOLS-1-AFPB), the maximum ε-PL concentration and productivity reached to 39.2 ± 0.63 g/L and 0.48 g/L/h. The cells immobilized in rGOLS-1 with high vitality and ε-PL production efficiency were reused six times over a period of 624 h. This research afforded an effective approach to enhance the fermentation performance of immobilized cells with the design of an advanced immobilization carrier.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Chengzhi Li,Hailin Lu,Guangshen Xu,Feng Hu,Jianhui Li,Lisha Wang
For the rotating parts of low-speed heavy machinery, it is difficult to replace and add lubricants, so coating the mechanical surface is an effective method to reduce friction and wear. In this study, a smooth functional film with good mechanical strength was designed and prepared by combining graphene oxide (GO) with polyethylene glycol (PEG). This wachieved by grafting PEG onto the GO surface. The effects of lubrication for the cases of flexible lubricating film, no film, and single film were analysed. The lubrication characteristics of GO–PEG flexible composite film under water lubrication, are discussed in detail. The results show that the mixture of PEG and GO can significantly improve the thermal stability, film forming properties and mechanical properties of GO–PEG composites. The membrane has a good friction limit performance. Compared with the uncoated surface, the friction coefficient is reduced by 74% and the wear rate is reduced by 70%.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 12
·120542
·
IF 4.316
Ke Qu,Yuqi Bai,Miao Deng
The ever-increasing need for small and lightweight power sources for use in portable or wearable electronic devices has spurred the development of supercapacitors as a promising energy storage and conversion system. In this work, a simple, facile and easy-to-practice method has been developed to employ carbon paper (CP) as the support to coat molybdenum disulfide (MoS2) and graphene oxide (GO), followed by electrodeposition of polyaniline (PANI) to render CP/MoS2-GO-PANI. The preparation parameters, such as amounts of MoS2, GO and number of aniline electropolymerization cycles, have been optimized to render CP/MoS2-GO-PANI the best capacitive performance. The as-prepared optimal CP/MoS2-GO-PANI is characterized by X-ray powder diffraction, scanning electron microscopy, energy-dispersive spectroscopy, and X-ray photoelectron spectroscopy. The supercapacitive properties of CP/MoS2-GO-PANI as an electrode have been evaluated electrochemically via cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy testing. CP/MoS2-GO-PANI delivers a specific capacitance of 255.1 F g−1 at 1.0 A g−1 and exhibits excellent rate capability under larger current densities. Moreover, a symmetrical supercapacitor is assembled and three are connected in series to power a light-emitting diode for ∼15 min, demonstrating the promising application potential of CP/MoS2-GO-PANI-based supercapacitor.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Jia Cheng,Xiaoyang Yue,Caixia Chen,Xiaoping Shen,Shiping Zeng,Zhenyuan Ji,Aihua Yuan,Guoxing Zhu
Developing highly efficient, low-cost and stable electrocatalysts for oxygen evolution reaction (OER) is momentous to achieve the conversion and storage of sustainable energy. Herein, the CoFe(OH) x / GO composites with accordion-like CoFe(OH) x nanosheets clusters dispersed on graphene oxide (GO) sheets are prepared via a template-assisted route. It is found that the OER performance of the CoFe(OH) x / GO composites strongly depends on the content of GO and the mole ratio of Co/Fe. The optimized CoFe(OH) x / GO composites exhibit remarkably enhanced OER electrocatalytic activity in 1 M KOH with a low overpotential of 294 mV at 10 mA cm −2 and a small Tafel slope of 63.4 mV dec −1 , which are far superior to the corresponding Co(OH) 2 / GO and bare CoFe(OH) x . The enhanced electrocatalytic activity can be ascribed to the regulated electronic structure surrounding the active metal sites by introducing Fe, the improved conductivity by GO for faster charge transfer, and the accordion-like hierarchical structure with increased accessible active sites. This work demonstrates a comprehensive strategy to improve the electrocatalytic performance of transition metal hydroxide based OER catalysts.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Chengbao Liu,Dongchen Shen,Zhengkai Tu,Song Li
Li + doping is regarded as an effective strategy to enhance the room-temperature hydrogen storage of metal-organic frameworks (MOFs). In this work, Li + is doped into both MIL-100(Fe) and MIL-100(Fe)/graphene oxide (GO) composite, and it is demonstrated that the hydrogen uptake of Li + doped MIL-100(Fe)/GO (2.02 wt%) is improved by 135% compared with Li + doped MIL-100(Fe) (0.86 wt%) at 298 K and 50 bar, which is ascribed to its higher isosteric heat of adsorption (7.33 kJ/mol) resulting from its more accessible adsorption sites provided by doped Li + ions and ultramicropores. Grand canonical Monte Carlo (GCMC) simulation reveals that Li + ions distributing in the interface between MIL-100(Fe) and GO within MIL-100(Fe)/GO composite is favorable for hydrogen adsorption owing to the increased number of adsorption sites, thus contributing to the enhanced hydrogen storage capacity. These findings demonstrate that MIL-100(Fe)/GO is a more promising Li + doping substrate than MIL-100(Fe).
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Xue Liang,Xiaojie Li,Yong Tang,Xiyu Zhang,Wei Wei,Xiaoya Liu
Despite great efforts have been made on epoxy resins modification, development of additives that can be used to efficiently and universally modify epoxy composites remains a challenging task. Herein, graphene oxide (GO) sheets were covalently linked with hyperbranched epoxy resin (HBPEE-epoxy) to form HBPEE-epoxy functionalized GO (HPE-GO), which was then incorporated into epoxy resin (EP) matrix to achieve efficient and all-purpose enhancement of the properties of EPs. Compared with unmodified GO sheets, the functionalized HPE-GO sheets were better dispersed and exhibited better interfacial compatibility with the epoxy matrix, and consequently, the mechanical and thermal properties of HPE-GO/EP composites improved significantly compared to unmodified GO/EP composites. The tensile strength, flexural strength, impact strength, and fracture toughness ( K IC ) of EP composites containing 0.5 wt% HPE-GO increased by 65.0%, 36.2%, 259.1%, and 178.9%, respectively, compared with those for the neat EP. The storage modulus ( E '), glass transition temperature ( T g ), and thermal stability ( T 5% ) also showed modest improvements. Furthermore, the HPE-GO/EP composites exhibited optimal thermal conductivities and thermal expansion properties, while maintaining higher volume resistivities compared with GO/EP composites. The results of this study support that HPE-GO is a promising, all-purpose modifier for EPs.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2021
·
IF 7.991
Xiang Li,Yifei Qu,Xiu Wang,Huiyang Bian,Weibing Wu,Hongqi Dai
Rubber and plastic are widely acted as substrates in flexible electromagnetic shielding (EMS) materials. However, these materials have several drawbacks in practical applications, such as potential environmental concerns and difficulties in degrading. In this work, a biodegradability paper-based material composed of electromagnetic wave loss layer (graphene/ silver nanoparticles (AgNPs) coating) and reflective layer (aluminum film layer) was successfully fabricated. The electromagnetic wave loss layer constructed three-dimensional (3D) electric conductive network to facilitate the timely transfer of electrons and heat energy obtained from electromagnetic waves. Meanwhile, the reflective layer received electrons and heat from the electric conductive network and make a small quantity of transmission wave back to the wave loss layer. The resulting material exhibited an ultrahigh electromagnetic interference shielding effectiveness (EMI SE) of 92.29 dB within 8–13 GHz, electrical conductivity of 4431 S/m, mechanical properties with a tensile strength of 32 MPa and elongation at break of 6.65%. Compared to the traditional EMS materials, the composite material integrated with excellent EMI SE, heat transfer performance, and weatherability, which has potential applications in microelectronics, high integrated circuits, and flexible electronic fields.
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Pu Wang,Lipin Li,Yu Tian,Li Sun,Wei Zhan,Shixuan Chen,Jun Zhang,Wei Zuo
Removal and recovery of phosphorus (P) from wastewater is beneficial to both environmental protection and resource sustainability. Enriching the low concentration of P in wastewater will greatly facilitate the effective recovery of P. To enhance the adsorption performance and recyclability of adsorbents for low concentration P-containing wastewater, a novel three-dimensional (3D) graphene/La(OH) 3 -nanorod aerogel (GLA) was prepared by a unique self-assembly process in this study. Benefiting from the large specific surface area of graphene aerogel , which provides sufficient loading sites for the favorable dispersion of La(OH) 3 nanorods, the GLA achieves an excellent P adsorption capacity of 76.85 mg/g. It is also highly selective for P, with adsorption capacity reduced by only 14% and 11% under the interference of high concentration of dissolved organic matter or multiple competing anions respectively. Further mechanistic investigation revealed that the whole adsorption process consists of three stages: (1) ion-exchange process; (2) La P inter-sphere coordination process; and (3) crystal evolution process. In the continuous flow adsorption-desorption cycles, the P concentration was concentrated ~25 times that of the feeding water (2 mg P/L). To our knowledge, this is the first time that La-modified graphene aerogel has been studied for P recovery. This provides a new method for the P removal and recovery of low concentration P-containing wastewater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Yuanyuan Yao,Shaohua Jin,Manman Wang,Feng Gao,Bolin Xu,Xijuan Lv,Qinghai Shu
The light weight and high integration of modern electronic equipment put forward higher and higher requirements for electromagnetic interference (EMI) shielding films. Herein, a structure of ternary MXene/graphene@Fe 3 O 4 /PVA (polyvinyl alcohol) films with high flexibility and good EMI shielding performance were prepared by simple casting method, the resulting fillers showed good compatibility with the PVA matrix. Surprisingly, the EMI SE of the resulting film with a thickness of only 1 mm reached 36 dB in X band, especially since it exhibited a shielding dominated by the absorption of electromagnetic waves (SE A was 32 dB). The obtained PVA composite films displayed classic ductile fracture characteristics, and the elongation at break was greater than 160%. Conductive MXene and graphene promoted the dielectric loss of electromagnetic waves, while magnetic Fe 3 O 4 particles were beneficial to the magnetic loss of electromagnetic waves. Furthermore, the layered ternary MXene/graphene@Fe 3 O 4 structure enhanced the multiple reflection and attenuation of electromagnetic waves inside the composites, which reinforced PVA films very promising as thinner and lighter EMI shielding materials in the field of flexible electronics.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 44
·25104-25113
·
IF 12.732
Hang Xu,Xuya Jiang,Xiangsheng Han,Hongzhen Cai,Feng Gao
Biomaterial-based flexible gels are attracting considerable interest in the areas of wearable sensors due to their conducive biocompatibility and degradability. However, concurrently integrating conductivity, toughness, adhesiveness, low-temperature tolerance, and self-recovery capability into biomaterial-based gels via simple and low-cost ways is still a great challenge. Herein, conductive reduced graphene oxide (RGO) is successfully introduced into protein networks derived from edible wheat flour dough by simple kneading, washing, and solvent exchange processes. The dense protein networks, diverse functional groups, and potential interactions among components endow the obtained organohydrogels (GGOHx) with favorable toughness (∼1.83 MJ m−3), compatible adhesion toward various materials, and self-recovery capabilities. Moreover, with the help of glycerol, GGOHx exhibit promising water retention and low-temperature tolerance. As wearable strain sensors, GGOHx with sensitive deformation-dependent conductivity can monitor both large-scale human motions (e.g., joint bending) and tiny physiological signals (e.g., swallowing) in the temperature range from −20 °C to 25 °C with long-term stability (>4000 cycles). Therefore, this work may pave a green and simple way for the fabrication of high-performance protein-based strain sensors.
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Ao Wang,Wei Xu,Yunjuan Sun,Kang Sun,Jianchun Jiang
High electrical conductivity and excellent pore affinity for electrolyte are the two necessary characteristics for high-rate performance supercapacitors based on activated carbon electrode. Nevertheless, it is fairly challenging to simultaneously improve them due to they are usually in the tug of war relationship in aqueous electrolyte. Herein, based on the different antioxidant abilities of graphitized carbon and amorphous carbon, a well-designed heterogeneous structure activated carbon (HGCAC) with graphitized carbon shell, amorphous carbon inner, and hydrophilic pores has been successfully prepared by a combined procedure of solid phase grinding, catalytic graphitization, and hydrothermal oxidation. Owing to the heterogeneous structure, HGCAC exhibits a joint improvement of electrical conductivity and the pore affinity for aqueous electrolyte, and thus leads to the remarkable enhancement of capacitance and rate capability, in comparison with the commercial coconut shell derived activated carbon (CAC) for supercapacitor. When the current density increases 100 times to 50 A g −1 , the specific capacitance of as-made HGCAC is 203.4 F g −1 , with the capacitance retention of 81.0%, being nearly 2.14 times of CAC’s capacitance (95.2 F g −1 ) and 1.6 times of its capacitance retention (51.0%). Moreover, good rate capability is still maintained when HGCAC is assembled to a coin type supercapacitor, with the capacitance retention of 82.1% at 50 A g −1 .
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2021
·
IF 6.583
Xin-ru Wang,Jing Zhong,Kai-da Zhu,Sen-lin Wang
To suppress the sulfation of the negative electrode of lead-acid batteries, a graphene derivative (GO-EDA) was prepared by ethylenediamine (EDA) functionalized graphene oxide (GO), which was used as an effective additive for the negative electrode of lead-acid batteries. The effect of GO-EDA on the performance of lead-acid batteries was studied by electrochemical methods, simulated cell performance test, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that when the negative active material (NAM) contains 0.5 wt.% GO-EDA additive (the N-0.5 cell), the initial discharge capacity of the cell at a rate of 0.05 C is 171.47 mAh g −1 . Meanwhile, the high-rate partial state of charge (HRPSoC) cycle life of the N-0.5 cell under 1 C rate is 17,970 cycles, which is 280% higher than that of the blank control cell. In a word, GO-EDA has the potential to be applied to enhance the specific capacity and HRPSoC cycle-life of lead-acid batteries.
✓ 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）