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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高影响因子
SURFACE & COATINGS TECHNOLOGY
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2021
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IF 4.158
Dandan Li,Han Peng,Zaiwen Lin,Jiahui Zhu,Jing Yu,Jingyuan Liu,Rongrong Chen,Qi Liu,Jun Wang
Taking advantage of the excellent barrier properties of reduced graphene oxide (rGO) sheets and the loading capacity of mesoporous silica (SiO 2 ), silane-functionalized rGO/SiO 2 nanocontainers are synthesized and, after loaded with benzotriazole (BTA), composite corrosion protection coatings are prepared. The XRD , FTIR, XPS , SEM , and TEM are used to confirm the successful preparation of silane-functionalized rGO/SiO 2 nanocontainers, and BET and UV–visible measurements are used to estimate the loading and release behavior of BTA. Dispersion stability of the nanocontainers is observed, the surface morphology , wettability , and water absorption of coatings are characterized by SEM, water contact angle, and weight method, respectively. The corrosion behavior of pristine and scratched composite coatings is characterized by EIS , the effect of released BTA is further confirmed. The results show that silane-functionalized rGO/SiO 2 nanocontainers possess excellent dispersibility and load capacity, reduce defects and micropores in composite coatings, and provide improved permeability resistance, corrosion resistance , and self-repairing performance.
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高影响因子
APPLIED CLAY SCIENCE
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2021
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IF 5.467
Yuchuan Liu,Zongxue Yu,Qiuxiang Wang,Ximei Zhu,Runxuan Long,Xuyang Li
Layered double hydroxides (LDHs) is a typical type of anionic clay minerals. In this study, an SDS-LDH with sodium dodecyl sulfate (SDS) intercalation was prepared by the ion exchange method, and the modified SDS-LDH was successfully combined with graphene oxide (GO). In the presence of dopamine, partial reduction of GO to reduced graphene oxide (RGO). RGO/PDA/SDS-LDH (RPS) composite material was prepared successfully and used in the field of membrane separation . The RPS-2 composite membrane combines the advantages of GO and SDS-LDH, which can increase GO flux while maintaining a high rejection rate. The flux was increased from 10.21 L·m −2 h −1 bar −1 of GO to 79.24 L·m −2 h −1 bar −1 of RPS-2, and the rejection rate of various dyes was above 97%. The rejection rate of methylene blue (MB) 97.34% was maintained after 10 cycles, and its flux loss rate is only 45.32%. The composite membrane had good stability under different pH conditions , which provides a basis for the practical application of the membrane.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Honglu Wu,Zenghui Qiu
Fe 3 O 4 particles are designed to originate reversible faradaic process and carbon material with a rice-like shape and meso-pore dominated structure is designed to encapsulate the Fe 3 O 4 particles. Synthesized carbon nano rice wrapped Fe 3 O 4 are uniformly anchored on the surface of reduced graphene oxide (rGO) nano sheets in a one-pot facile hydrothermal procedure. A significant amount (13.28 at%) of N is also doped into the carbon nano rice in the hydrothermal process, simultaneously. The synthesized Fe 3 O 4 @N-Carbon nano rice/rGO (Fe 3 O 4 @N-PCNR/rGO) delivers a high capacity of 495 Cg -1 at a current density of 1 Ag -1 and high long-term stability of 70% after 1000 charge-discharge cycles at 10 Ag -1 . The Fe 3 O 4 @N-Carbon/rGO is utilized as a positive electrode, and synthesized 3D rGO aerogel is employed as a negative electrode to fabricate a supercapattery, which exhibits a wide operating potential window of 1.5 V, a high energy density of 46 W h kg -1 at 750 W kg -1 , and even 10 W h kg -1 at an elevated power density of 7500 W kg -1 . The supercapattery also performs well in terms of long-life stability with 80% of capacitance retention after 10,000 charge-discharge cycles at 10 Ag -1 .
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Zhao Li,Zhi Liu,Yang Li,Qiu Wang
In this article, a simple yet effective in situ hydrothermal method has been developed to synthesize a series of CeO 2 and reduced graphene oxide (RGO) stepwise-doped CoAl-LDH (CACR) composites with CoAl-LDH/CeO 2 (CAC) as the intermediate. The smart design well integrates the photo-electrochemical merits of CoAl-LDHs and CeO 2 with conductive RGO to form an optimized formula with high light-harvesting ability, efficient charge separation, and rapid electron transfer . Owing to these features, the sample of CAC-5-R-10 containing 5 wt% CeO 2 and 10 wt% RGO, is found to be the most efficient one as the catalyst for CO 2 photoreduction with a high average CO evolution rate of 5.5 μmol·g −1 ·h −1 at 25 °C without sacrifice reagent or extra photosensitizer under ultraviolet light, which surpasses those of the single CeO 2 , CoAl-LDHs, the intermediate of CAC, and many reported LDH-based counterparts. With the assistance of Mott–Schottky curves, the Z-scheme mechanism is proposed for the significantly enhanced photo-activity of the CAC-5-R-10. The present work provides a good sample for integrating LDHs with a second semiconductor and conductive RGO for collaborative optimization of photoelectric characteristics towards enhanced CO 2 photoreduction.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Lingjie Li,Zhonghao Ning,Wenyan Huang,Liang Liao,Yinong Zheng,Kun Zhuang,Siqi Lan,Yinggan Zhang,Rongqian Yao
An ingenious strategy to prepare in-situ formed SiC(Al, rGO) bulk polymer-derived ceramics (PDCs) from re-pyrolyzing SiC(Al, rGO) p /polyaluminocarbosilane-vinyltriethoxysilane-graphene oxide (PACS-VTES-GO, PAVG) blends is highlighted. Flexible PAVG modified by Al with highly cross-linked structure effectively improves molecular weight and formability of precursors. Rigid SiC(Al, rGO) p fillers provide high mechanical properties owing to their unique microstructure which is consistent with SiC(Al, rGO) bulk PDCs. β-SiC nanocrystals are well dispersed in amorphous SiO x C y /C free , and rGO exhibits good compatibility with SiO x C y /C free . Besides, possible Al 2 O 3 is beneficial to relaxing thermal stress at β-SiC nanocrystalline boundaries. Interestingly, introduction of Al could avoid coarsening of β-SiC grains to enhance elevated temperature resistance. Furthermore, effect of re-pyrolysis temperature on the formation and microstructure of SiC(Al, rGO) bulk PDCs was also investigated. Particularly, lightweight samples re-pyrolyzed at 1300 °C display optimal fracture toughness (3.32 MPa m 1/2 ), compressive strength (177.16 MPa) and flexural strength (51.25 MPa), high ceramic yield (94.46%) and low linear shrinkage (4.38%), by far superior to those of most PDCs. As treated via precursor infiltration and pyrolysis (PIP) route and heated by butane gun flame in air, such products possess stable structures under elevated temperatures and have potential emerging uses in aerospace components.
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高影响因子
COMPOSITES COMMUNICATIONS
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2020
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IF 4.915
Zhiyang Jiang,Haoxu Si,Xin Chen,Huimin Liu,Lei Zhang,Yahong Zhang,Chunhong Gong,Jingwei Zhang
In this work, to meet the comprehensive demands for efficiency and lightweight electromagnetic wave absorption (EWA) material, boron nitride/reduced graphene oxide (BN/RGO) nanocomposites were prepared via a one-step thermal nitridation process. The insulative BN component in the obtained nano BN/RGO hybrids realized the regulation of conductivity and thus impedance matching, and the large interface area of the hybrids facilitated the high-frequency polarization effect and contributed to the enhanced EWA performance. Remarkably, the EWA performance of optimized BN/RGO hybrids reached a strong reflection loss ( RL ) of −48.9 dB in a broad effective absorption bandwidth of 4.2 GHz with a low filler content of 3.0 wt. % and at a thin thickness of 2.6 mm, which well outperforms that of most other reported dielectric absorption materials. Our results may light a new way on introducing light element component to produce high-efficiency RGO-based EWA materials with facile and low-cost production process.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Tian Tao,Yang Zhou,Mingyu Ma,Hanping He,Nan Gao,Zhiwei Cai,Gang Chang,Yunbin He
A novel graphene electrochemical transistor (GECT) based on zirconia/reduced graphene oxide (ZrO 2 /rGO) nanocomposites functionalized gate electrode and graphene as channel was successfully designed and fabricated for highly sensitive detection of methyl parathion (MP). ZrO 2 /rGO nanocomposites were co-electrodeposited on a glassy carbon electrode considering the special affinity of ZrO 2 toward phosphate groups and high specific surface area of rGO. The sensing mechanism is attributed to the change of effective gate voltage applied to GECT induced by the electrochemical reactions of MP at the functionalized gate electrode, thus tuning the channel carrier concentration and the channel current. Due to the excellent electrocatalytic activity of ZrO 2 /rGO on the gate and the high carrier mobility of graphene in the channel, the developed sensor exhibited excellent sensing performances with ultra-low detection limit (10 pg/mL) and ultra-wide linear range from 10 pg/mL to 10 μg/mL, which especially stand out of the reported devices. The GECT sensor also showed good selectivity toward usual interferents and strong practicality through testing MP in Chinese cabbage samples. The developed GECT devices provided not only the novel platform for pesticide detection with high sensitivity but the new method of enhancing the sensing performance through specifically functionalized gate electrode.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
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2021
·Vol. 47
·期 6
·2297-2310
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IF 2.914
Song Yupeng,Zhou Feng,Chai Yongheng,Zhan Su
Marine pollution has become ever more serious, and photocatalysts have potential prospects in the application of marine anti-pollution. The RGO/Bi 2 WO 6 composite with the microsphere structure was synthesized by the hydrothermal method. The results showed that the sterilization rate of 2% RGO/Bi 2 WO 6 coating increased to more than 93% under visible light. The high performance was attributed to the improvement of the charge separation efficiency and the enhancement of the utilization rate of light. The formation mechanism of microspheres was discussed. Radical capture experiments proved that hydroxyl radical was the major active substance. Photocurrent and EIS experiments indicated that 2%RGO/Bi 2 WO 6 had excellent carrier separation efficiency.
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高影响因子
MATERIALS & DESIGN
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2020
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IF 6.289
Xianhong Zheng,Wenqi Nie,Qiaole Hu,Xuewei Wang,Zongqian Wang,Lihua Zou,Xinghua Hong,Haiwei Yang,Jiakun Shen,Changlong Li
With the rapid development of information technology and electronics, the traditional textiles hardly fulfill the requirements of wearable electronics. Multifunctional textile-based electronics integrated with energy storage, joule heating, electromagnetic interference (EMI) shielding and sensing has become a favorable solution. Herein, a scalable spray-coating and dip-coating strategy is developed to fabricate the multifunctional reduced graphene oxide/Ti 3 C 2 T x MXenes decorated cotton fabrics. The RGO/MXene modified fabrics show hydrophilic surface, high electrical conductivity, good flexibility and breathability. In addition, the RGO/MXene modified fabrics demonstrate excellent electrochemical performance, and the assembled all-solid-state supercapacitors show one of the highest specific capacitances of 383.3 F g −1 (258 mF cm −2 ). More importantly, the RGO/MXene fabrics show distinctive negative resistance variation and high sensitivity when they are applied as the strain sensors to detect the human motions including the bending of finger, elbow, knee and swallowing process. Moreover, the RGO/MXene fabrics show good joule heating and EMI shielding performance. This work may shed light on cost-effective but high-performance textile-based strain sensors, EMI shielding and electrochemical energy storage devices, and paves the way for the development of multifunctional wearable electronics.
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高影响因子
ACS Applied Materials & Interfaces
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2020
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IF 8.758
Jin Li,Ying Song,Yanna Wang,Hui Zhang
A series of hierarchical nanosheet array-like Co–Al layered double hydroxides (LDHs)/reduced graphene oxide (rGO) hybrid supported ultrafine PdCu nanocluster (NC) catalysts m-PdCux/LDHs/rGO (x: Cu/Pd molar ratio of 1.5, 3.0, and 5.5; m: Pd loadings of ∼0.80, 0.40, 0.11, and 0.01 wt %) were assembled via an ultrasonic-assisted NaBH4 reduction–sol immobilization strategy. The as-obtained catalysts display ultrafine PdCu alloy NCs with sizes of ∼0.9–1.8 nm finely tuned by both Cu/Pd ratios and Pd loadings and mainly distributed on the edge sites of LDH nanosheets and part of LDHs–rGO junctions upon the unique hierarchical nanosheet array-like structure. Three catalysts 0.85-PdCu1.5/LDHs/rGO, 0.83-PdCu3.0/LDHs/rGO, and 0.80-PdCu5.5/LDHs/rGO exhibit excellent Heck reactivity for iodobenzene with styrene, of which the 0.83-PdCu3.0/LDHs/rGO shows the highest activity, much higher than Pd/LDHs/rGO and single LDHs or GO supported PdCu3.0 catalysts, attributed to the ultrafine PdCu3.0 NCs, the largest electron density of the Pd0 center, and the strongest PdCu3.0 NCs–LDHs–rGO three-phase synergistic effect. The lowest Pd-loading sample 0.01-PdCu3.0/LDHs/rGO shows an unprecedented turnover frequency of 210 000 h–1 (Pd dosage: 2 × 10–5 mol %) with the highest value so far, excellent adaptability for substrates, and reusability. The present work provides a versatile method for designing hierarchically structured ultrafine Pd–M alloy NC catalysts for varied catalysis processes.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2020
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IF 3.83
Gang Su,Lihua Liu,Xing Liu,Lixing Zhang,Jianrong Xue,Anping Tang
A novel magnetic Fe 3 O 4 @SiO 2 @BiFeO 3 /rGO composite was successfully fabricated via a facile hydrothermal method . This composite consisted of flower-like core-shell structured Fe 3 O 4 @SiO 2 @BiFeO 3 microspheres mounting on reduced graphene oxide (rGO) nanosheets . The specific surface areas, magnetization saturation value ( M s ), and band gap energy ( E g ) of Fe 3 O 4 @SiO 2 @BiFeO 3 /rGO (x = 0.15 g) were 139.26 m 2 /g, 20.3 emu/g, and 1.91 eV, respectively. Fe 3 O 4 @SiO 2 @BiFeO 3 /rGO (x = 0.15 g) exhibited remarkable ability to photocatalytically degrade ciprofloxacin (CIP), tetracycline hydrochloride (TC-H), methylene blue (MB), and decolorize a mixed solution of MB, methyl orange (MO), and rhodamine B (Rh B); CIP, TC-H, and MB degradation by Fe 3 O 4 @SiO 2 @BiFeO 3 /rGO conformed to a first-order kinetic reaction, and the corresponding k app values by Fe 3 O 4 @SiO 2 @BiFeO 3 /rGO (x = 0.15 g) were 0.04211, 0.02792, and 0.05967 min −1 , respectively. Excellent magnetic separation performance, recyclability, and stability were also observed. A suitable amount of rGO to the as-prepared photocatalyst could decrease the E g , accelerate the transfer of photogenerated electrons (e − ), suppress the recombination of photo-generated e − –hole (h + ) pairs, and enhance the visible-light response of the catalyst. The •OH is the dominant active species during photocatalysis . This work suggests a promising strategy to synthesize photocatalysts with enhanced ability to catalytically degrade organic pollutant under visible light and excellent recyclability.
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高影响因子
危险品化学品经营许可证（带存储）