Journal of Materials Chemistry A
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2021
·Vol. 9
·期 44
·25104-25113
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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.
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FUEL
·
2021
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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 .
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BIORESOURCE TECHNOLOGY
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2021
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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.
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ENERGY CONVERSION AND MANAGEMENT
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2021
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IF 9.709
Shengnan Yan,Zhenggui Li,Xiaobing Liu,Fang Chen,Wangxu Li,Jie Cheng
Magnetically driven photothermal conversion and energy storage techniques can enhance the energy storage performance of phase change materials (PCMs) and thus have immense potential in energy applications. Paraffin is a common PCM that melts slowly and has poor rate of heat storage capacity. In this study, the effect of a controllable magnetic field on the photothermal and heat storage properties of paraffin was investigated. First, a reduced-graphene-oxide/nickel foam (rGO@Ni foam) composite film with good photothermal ability, corrosion resistance, and oxidation resistance was prepared, and photothermal conversion and energy storage processes under different magnetic fields were experimentally studied. The movement of the composite film could be adjusted by the action of magnetic force, especially to enhance the phase interface movement, accelerate paraffin melting, and improve the photothermal capacity and heat storage characteristics of the material. The composite film and phase interface could be dynamically tuned by regulating the magnetic field, thus enhancing the photothermal conversion effect. In particular, with increasing magnetic field strength, the thermal energy storage efficiency and speed of phase interface movement increased by 29% and 50%, respectively. The proposed magnetic force-driven method will enhance solar energy conversion and promote direct solar energy applications.
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IONICS
·
2021
·Vol. 28
·期 1
·273-281
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IF 2.817
Zhao Hu,Li Mingqiang,Fang Ziren
Hybrid dual-ion batteries have attracted much attention due to their low cost, high working voltage, and environmental friendliness. Since most of the reported hybrid dual-ion batteries use organic electrolytes, their safety issues remain to be studied, and their electrochemical performance is still unsatisfactory. In this work, we proposed an aqueous hybrid dual-ion battery based on Zn/MoSe 2 and realized the fast charging of the aqueous hybrid dual-ion battery for the first time. This novel hybrid dual-ion battery exhibits a high specific capacity of 134 mAh g −1 and excellent cycle stability (cycle life of 1000 times above) at a rate of 2C. In addition, the battery can store 84% of the battery capacity in 5 min after charging, with the specific capacity of 93 mAh g −1 , which shows its potential in high-rate fast charge–discharge energy storage applications.
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Nanomaterials
·
2021
·Vol. 11
·期 12
·3201
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IF 5.076
Huijun Li,Xin Xu,Jiwei Wang,Xuefeng Han,Zhouqing Xu
Tetracycline (TC) contamination in water has progressively exacerbated the environmental crisis. It is urgent to develop a feasible method to solve this pollution in water. However, polluted water often contains oil. This paper reported a glass fiber (FG)-assisted polyvinylidene fluoride (PVDF) hybrid membrane with dual functions: high TC degradation efficiency in emulsion and oil-water separation. It can meet the catalytic degradation of tetracycline in complex water. This membrane was decorated by coating the glass fiber with PVDF solution containing hydrophilic graphene oxide hybridized NH2-MIL-101(Fe) particles. Moreover, due to its strong mechanical strength enhanced by the glass fiber, it can be reused as TC degradation catalysts for dozens of times without cracking. Thanks to the hydrophobicity of PVDF and the surface pore size of MOFs, the prepared membrane showed a good oil-water separation performance. Besides, the hydrophilic graphene oxide (GO) and NH2-MIL-101(Fe) improved the membrane’s anti-fouling performance, allowing it to be reused as the separation membrane. Therefore, the outstanding stability and recoverability of the membrane make it as a fantastic candidate material for large-scale removal of TC as well as oil-water separation application.Keywords:GO/NH2-MIL-101(Fe);PVDF membrane;glass fiber;tetracycline degradation;oil-water separation
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APPLIED SURFACE SCIENCE
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2021
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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.
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高影响因子
CELLULOSE
·
2021
·Vol. 29
·期 1
·223-232
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IF 5.044
Huang Wei,Li Hongqiang,Lai Xuejun,Chen Zhonghua,Zheng Longzhu,Zhong Yu,Zeng Xingrong
With the increasing importance of electronic devices in modern industry, considerable efforts have been devoted to solving the problem that the electronic devices fail to work normally in a cold environment. Herein, we designed and fabricated a graphene wrapped wood-based phase change composite with electro-thermal conversion and energy storage capabilities by delignification of natural wood, coverage and reduction of graphene oxide (GO), impregnation of 1-tetradecanol (TD) and package of epoxy resin. The phase change composite exhibited large latent heat of fusion (218.5 J/g), excellent shape stability with high TD packing content of 88.4% and favorable reliability even after 50 heating–cooling cycles. More importantly, the Joule heat conversed by the rGO layer under voltage was able to quickly transfer to the surrounded TD, leading to the increase of the overall temperature of the composite and the efficient storage of energy. The findings conceivably stand out a sustainable strategy to fabricate an electrically driven wood-based phase change composite for preheating and heat preservation of electronics.
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Polymers
·
2021
·Vol. 13
·期 22
·3895
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IF 4.329
Tian Yuan,Jin Li,Shimin Wang
It is important to lower the cost and stability of the organic–inorganic hybrid perovskite solar cells (PSCs) for industrial application. The commonly used hole transport materials (HTMs) such as Spiro-OMeTAD, poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) and poly(3-hexylthiophene-2,5-diyl) (P3HT) are very expensive. Here, 3,4-ethylenedioxythiophene (EDOT) monomers are in-situ polymerized on the surface of graphene oxide (GO) as PEDOT-GO film. Compared to frequently used polystyrene sulfonic acid (PSS), GO avoids the corrosion of the perovskite and the use of H2O solvent. The composite PEDOT-GO film is between carbon pair electrode and perovskite layer as hole transport layer (HTL). The highest power conversion efficiency (PCE) is 14.09%.Keywords:perovskite solar cell;hole transport layer;carbon materials;polymeric composites;solar energy materials
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
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IF 6.953
Shuo Shi,Guocheng Wang,Jie Liu,Sunan Liu,Qiuyu Xu,Xi Lan,Jianxing Feng,Jing Sun,Wentao Zhang,Jianlong Wang
Gentiana straminea Maxim. exhibits various biological activities. However, the purification and functions of polysaccharides in Gentiana straminea Maxim. have never been reported. Herein, by proposing a flexible 3D graphene-based decoloration column (3DD column), Gentiana straminea Maxim. polysaccharide (GMP) was high-throughput obtained and its anti-inflammatory activity was investigated. Benefiting from the large macroporous network of 3D NH 2 -graphene oxide hydrogel with selective adsorption towards pigments, the 3DD column exhibits high decoloration ratio (96.41%). In addition, the 3DD column provides superior practical functionality as compared to the traditional approaches, which are time-consuming and need toxic solvents, and exhibiting widespread-application for the purification of polysaccharide from other common plant species. More importantly, the decolored GMP as a natural product has promising anti-inflammatory activity on RAW264.7 cells without negative impact on cell viability . Overall, this work reveals a new functional polysaccharides and provides a flexible approach for polysaccharide decoloration, exhibiting a promising prospect for natural polysaccharides in practical application of pharmaceutical.
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Journal of Cleaner Production
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2021
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IF 9.297
Jianhua Hou,Tingting Zhang,Ting Jiang,Xiaoge Wu,Yongcai Zhang,Muhammad Tahir,Asif Hussain,Min Luo,JiJun Zou,Xiaozhi Wang
Bismuth oxyhalides (BiOX, X = Cl, Br, I) exhibit excellent photocatalytic activity owing to their distinctive layered structures and suitable bandgaps. However, BiOX and its derived composites are usually fabricated via the liquid-phase strategy, which always produces waste liquid , thereby polluting the environment. Recently, BiOX/reduced graphene oxide (RGO) with two-dimensional/two-dimensional (2D/2D) heterostructures have been successfully prepared without using any solvent by one-pot mixing/grinding using chemicals such as bismuth nitrate pentahydrate, potassium halide , graphene oxide (GO), and BH 4 K. The fabricated BiOX/RGO heterostructures were endowed with oxygen-rich vacancies and a very short fabrication time of 15 min. During the synthesis process, BiOX can grow in situ on the GO due to Bi 3+ ions; thus, BiOX could be adsorbed easily on the GO surface, with the negatively charged oxygen-containing functional group. Significantly, BH 4 K not only reduces GO to RGO but also introduces a suitable concentration of oxygen vacancies (OVs) in BiOX, which can photo-induce the carrier separation efficiency and effectively improve visible-light absorption. BiOX/RGO with a 2D/2D heterojunction structure provided a higher specific surface area and a larger heterogeneous interface and transferred photogenerated electrons regularly. Owing to the dual synergistic effects of the aforementioned features, BiOX/RGO can produce more active substances (h + , •OH, and •O 2− ) for the photodegradation of organic pollutants. The results showed that the photocatalytic performance of BiOCl/RGO, BiOBr/RGO, and BiOI/RGO was significantly improved as the degradation rate of Rhodamine B (RhB) under visible-light irradiation was 6, 3, and 2 times higher than that of pure BiOCl, BiOBr, and BiOI, respectively. Furthermore, BiOX/RGO displayed a similar enhanced photocatalytic effect on tetracycline degradation . Therefore, this work provides a versatile, green, and fast method to synthesize BiOX/RGO composites for the photodegradation of different organic pollutants.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2021
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IF 3.995
Qian Zhang,Bing Xin Wang,Yu Lian Zhou,Jun-ming Hong,Yong Bo Yu
Doping graphene with fluorine atoms could increase the capacitance of graphene and promote the migration of ions and electrons, thereby increasing electrocatalytic activity. For energy conservation and environmental protection, fluorine-doped graphene oxide was made by an effective solvothermal method and then used as a cathode for acetaminophen (APAP) degradation under constant current and pulse current supply. Unexpectedly, the removal rate of APAP was the same under constant current and pulse current supply within 120 min. To clarify the underlying mechanism under constant current and pulse current supply, various active species generated during the reaction were analyzed. It was found that the different functional active species contributed to the efficiency under constant current and pulse current supply. O 2 •− and chloride reactive species were favorably generated during constant current supply and oxidized APAP, whereas •OH played a critical role in APAP oxidation without current supply. Two possible routes for APAP degradation are proposed under constant current and pulsed current supply. This research first uses the synergic effect of the electron storage capacity and the electrocatalytic capability of fluorine-doped graphene oxide for pollution degradation, and deepens the understanding of fluorine doping for the electrochemical catalytic oxidation of APAP.
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