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
RESEARCH ON CHEMICAL INTERMEDIATES
·
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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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Jianfeng Zhu,Dan Wang,Daming Chen,Baorui Song,Yanhuai Li,Fei Liu,Jian Chen
Mixed transition metal oxides with low-cost elements such as ZnFe 2 O 4 have been considered as the promising candidate as anode materials for Li-ion batteries (LIBs) owing to the high capacity originated from versatile redox reactions . However, poor conductivity and huge volume expansion during charging/discharging cause drastic capacity decay, which hinders their commercial application. Herein, we designed a unique core-shell N doped ZnFe 2 O 4 embedded in B, N doped graphene network (B/N-ZFO@rGO) using ionic liquids as multi-heteroatom source through facile hydrothermal reaction . Benefiting from the enhanced conductivity and structural stability, the B/N-ZFO@rGO as anode material for LIBs not only shows significantly improved specific capacity (668.1 mAh g −1 at 1 A g −1 after 100 cycles), but also remarkable rate capacity and long cycle life (377.4 mAh g −1 at 5 A g −1 after 1200 cycles), demonstrating great potential in future applications. Moreover, such rational design of structure as well as multiple elements doping using ionic liquids can be extensively applied in other electrode materials.
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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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Materials Today Communications
·
2020
·
IF 2.678
Jing He,Hua Wang,Qiqi Qu,Zheng Su,Tengfei Qin,Yunsheng Da,Xingyou Tian
Reduced graphene oxide (rGO) has been excellent three-dimensional network carries due to unique flexibility and high thermal conductivity. However, restricted by excellent electrical property of rGO, it remains blocking to fabricate high performance polymer composites applied in the electronic packaging field. In this work, a novel GO-assisted method was used to prepare different rGO@SiC structure as efficient heat pathways in polymer composites achieving desirable performance. The as-prepared epoxy composite, at a filler loading of 30 wt% and SiC particles of 600 nm, exhibited not only a high thermal conductivity (1.02 W/mK) but also the lowest electrical conductivity (1.18 × 10 −12 S/cm). An effective medium theory model (EMT) was constructed to perfectly predict the thermal conductivity of the composites and precisely calculate the interfacial thermal resistance. The research provides a creative insight to the design of rGO structure and high-performance composites with a bright application prospect in advanced thermal managing materials.
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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
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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CERAMICS INTERNATIONAL
·
2020
·
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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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
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Junying Huang,Mengting Chen,Tao Tang,Weipeng Liu,Yingju Liu
The self-supporting catalytic electrode is useful in the industry, since it can reduce the complex pre-treatment of catalytic materials and avoid the use of binders. In this work, a ternary self-supporting electrode including Cu mesh-supported graphene and molybdenum disulfide (MoS 2 ) was prepared by electroplating zinc and hydrothermal reaction . Due to the excellent conductivity of copper and the hydrogen evolution catalytic ability of MoS 2 , this self-supporting electrode showed a low Tafel slope as 54 mV dec −1 and a current density of 400 mA cm −2 at an overpotential of -300 mV in hydrogen evolution reaction (HER). In addition, due to the metal flexibility of the Cu mesh substrate, the MoS 2 –rGO Cu ternary self-supporting electrode can be bent or cut into any desired shape. Even shaped as an elongated one, curved "S", this self-supporting electrode still kept itself from any deformation when hydrogen bubbles were rapidly generated. Therefore, a strategy for green, simple, and low-cost self-supporting electrode was provided, which may increase the large-scale operation of the catalytic electrode in HER.
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Nano Energy
·
2020
·
IF 16.602
Haitao Li,Charlynn Sher Lin Koh,Yih Hong Lee,Yihe Zhang,Gia Chuong Phan-Quang,Chao Zhu,Zheng Liu,Zhensheng Chen,Howard Yi Fan Sim,Chee Leng Lay,Qi An,Xing Yi Ling
Harvesting solar energy via pyroelectric technology is highly desired because it is a sustainable and clean solution to yield electricity. However, the low power output (below 5mW/m 2 ) and bulky device design of traditional devices hinder their practical applicability. Herein, we demonstrate a highly efficient sunlight-triggered pyroelectric nanogenerator (S-PENG) design that achieves unprecedented performance of 21.3 mW/m 2 under one sun irradiation. This is achieved via enhancing both the solar harvesting properties and the pyroelectric efficiencies rationally by employing polyethyleneimine (PEI) chemically modified reduced graphene oxide (rGO-PEI), and a pyroelectric layer based on a polarized polyvinylidene fluoride (PVDF) film respectively. Moreover, we demonstrate its practical application by adapting the S-PENG into a wearable outdoor bracelet. Using a facile hand-waving motion to replace the traditional bulky sunlight-alternating device, our compact bracelet can charge a fitness tracker after only 1 h of outdoor exposure, demonstrating its capability to be seamlessly integrated with outdoor sports activities. We expect our rational design to promote the development of S-PENG and pave the way for the utilization of sunlight as a viable on-the-go electrical source.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 13
·5445-5457
·
IF 3.553
Zhang Xinmeng,Mao Zixuan,Zhao Yuanxiao,Wu Yuanting,Liu Changqing,Wang Xiufeng
Co 3 O 4 is often used to detect H 2 O 2 . However, there are many problems such as low sensitivity and the long detection time when detecting H 2 O 2 in various cobalt oxide composites. Therefore, it is a great challenge to develop different morphologies of the Co 3 O 4 electrode to improve the detection performances of H 2 O 2 effectively. In this paper, we had successfully prepared a novel Co 3 O 4 /reduced graphene oxide/carbon cloth (Co 3 O 4 /rGO/CC) composite. We used a simple template method. Co 3 O 4 nanosheets with a diameter of about 47.7 nm were obtained by using graphene oxide as a template. Then, CC was used as a three-dimensional conductive support material. CC can inhibit the agglomeration of rGO to increase specific surface area and to enhance the conductivity of Co 3 O 4 . In this study, the electrochemical performances of the Co 3 O 4 /rGO/CC electrode were tested by the electrochemical workstation. The trigger response of the modified electrode was reduced by 0.067% and the relative standard deviation was 0.013% after 30 consecutive tests. The range of linearity was 0.387–63.523 mM. Besides, this electrode has the limit of detection (0.022 μM) and a higher sensitivity (0.9683 mA mM −1 cm −2 ). It indicated that the electrode has excellent electrochemical sensing performance and high stability. These excellent performances are mainly due to the synergistic effect of Co 3 O 4 nanosheets, rGO, and CC.
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