CARBON
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2021
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IF 9.594
Weili Teng,Qinqin Zhou,Xuekai Wang,Junyan Gao,Peng Hu,Yucheng Du,Hongyi Li,Jinshu Wang
Enhancing the specific capacitance and rate performance of graphene based fiber-shaped supercapacitors (FSSCs) is critical to achieving advanced energy storage devices with desired performance. Here, hierarchically porous reduced graphene oxide/poly (3,4-ethylenedioxythiophene):poly (4-styrenesulfonate) (rGO/PEDOT:PSS) hybrid fiber was constructed by co-assembling confined growth and acid treatment strategy. The rationally designed hybrid fiber addressed the issues of excellent conductivity and abundant porous channels for fast electrons transfer and rapid ions diffusion. As indicated, highly-oxidized small-sized GO precursor was utilized to endow rGO fiber with abundant ions diffusion channels and ions adsorption interfaces for double-layer capacitance, as well as ample oxygen functional groups for additional pseudocapacitance . The incorporation of acid-treated PEDOT:PSS also prevents the stacking of rGO sheets, improves the electrical conductivity and provides partial capacitance. Attributed to the synergy, the obtained hybrid fiber exhibits remarkably improved performance in FSSC with volumetric/areal specific capacitance of 226.5 F cm −3 /279.3 mF cm −2 at 0.5 A cm −3 and rate performance of 74.7% capacitance retention at 50 A cm −3 , which is much superior to the counterpart of previously-reported FSSC devices. Meanwhile, the resultant FSSC device also exhibits superb electrochemical stability (91%, 10000 cycles), holding a great application prospect in wearable electronics .
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高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 9
·期 3
·599-606
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IF 6.569
Shiyu Zhou,Jiapeng Ji,Tong Qiu,Liguang Wang,Wenbin Ni,Sheng Li,Wenjun Yan,Min Ling,Chengdu Liang
Hydrogen (H2) sensors based on metal oxide semiconductors (MOSs) have attracted considerable attention for safety concerns of traditional industries and energy storing devices. ZnO has been widely studied as an n-type MOS in H2 sensing due to the excellent stability, mobile conductive carriers, and wide bandgap. However, the poor selectivity and high working temperature limit its practical applications. Herein, we designed a heterostructure based on ZIF-8-derived ZnO by rGO functionalization to boost the selective H2 sensing. This composite demonstrated dramatic H2 selectivity against other flammable gases, particularly ethanol, which was improved by deoxygenation to reduce the surface oxygen functional groups. This sample showed excellent H2 sensing with a high response of ∼18 to 200 ppm H2, and a response/recovery time of 50/7 s at 400 °C. Even at a certain low temperature of 200 °C, the composite showed evident response to H2. The excellent gas sensing behavior could be attributed to the heterojunctions and enhanced electron mobility. Regulation of the surface oxygen-containing functional groups opens up a promising approach to adjust the gas sensing selectivity of MOS-based materials.
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高影响因子
CARBON
·
2021
·
IF 9.594
Jin-Bo Cheng,Yan-Qin Wang,Ai-Ning Zhang,Hai-Bo Zhao,Yu-Zhong Wang
Nowadays, there is an urgent need for microwave absorbing materials with light weight, thin thickness, and strong absorbing ability to solve the problem of electromagnetic radiation. In this study, we report a novel high-performance aerogel absorber by growing MoO 3 -doped WO 3 nanoflakes on reduced graphene oxide (rGO) sheets. The resultant rGO-Mo-WO 3 aerogel displays a low density (∼75 mg/cm 3 ) and unique hierarchical architectures including 3D porous microstructures, 2D rGO skeleton, and binary transition metal oxide of Mo-WO 3 nanoflakes, thus leading to excellent microwave absorption performances . Typically, rGO-Mo-WO 3 aerogel exhibits an ultra-strong reflection loss (RL) of −61.8 dB with a thin coating thickness of 1.54 mm. And a wide effective absorption bandwidth of 6.24 GHz can be achieved at a low filler loading of 8 wt%, much superior to previous ones. The synergistic effect of moderate polarization relaxation loss and weak conduction loss together with the porous microstructure for the aerogel result in the suitable impedance matching and strong microwave attenuation ability. This work may demonstrate a promising method to fabricate hierarchically nanostructured absorbers with the advantages of light weight, ultra-strong microwave absorption, and thin coating thickness.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Qian Zhou,Bo Jin,Ping Zhao,Shijin Chu,Rufang Peng
Radioactive pollution is extremely harmful to humans and the environment and is difficult to manage. Therefore, finding an economical and efficient adsorbent for the treatment of uranium-contaminated wastewater is urgent. A composite carbon aerogel (CNQDs/rGO) was prepared by a simple one-step hydrothermal method by using CNQDs and graphene oxide as monomers. The ZIF-67 crystal was directly deposited on the template (expressed as CNQDs/rGO/ZIF-67 carbon aerogel (CGZCA)). The combination of CNQDs and graphene can not only graft some target groups (–OH, –COOH, and –NH-) onto the surface of 3D graphene carbon aerogels to promote adsorption, but also transform the zeta potential of rGO/ZIF-67 from positive to negative, which is more conducive to the adsorption process. The material observed by SEM and TEM shows that ZIF-67 and CNQDs are distributed on the carbon aerogel. The relationship of the adsorption of CGZCA to UO 2 2+ with contact time and initial concentration is examined. Results show that the adsorption of UO 2 2+ follows a pseudo-second-order kinetic model (R 2 = 0.999), and is consistent with the Langmuir adsorption isotherm model (R 2 = 0.991). The adsorption mechanism of the prepared adsorbent to UO 2 2+ is studied by XPS. Various parameters are studied in detail in the static adsorption experiment, and the removal of uranyl by adsorbents in different water bodies is simulated. In addition, dynamic adsorption behavior and adsorption effect of CGZCA on UO 2 2+ are investigated, which provides an appropriate reference basis for practical applications. Results show that the prepared ternary composite carbon aerogel is expected to be used in the extraction of uranium in wastewater and large-scale industrial production applications.
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高影响因子
MICROCHEMICAL JOURNAL
·
2021
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IF 4.821
Jianhua Zhang,Huaying Hu,Lianqiao Yang
A highly stable acetylcholinesterase (AChE) sensor based on titanium oxide nanorods (TiO 2 -NRs) and reduced graphene oxide (rGO) for detecting dichlorvos (DDVP) is successfully developed. The sensor adopts a layer-by-layer assembly method to sequentially assemble chitosan (CS)-modified reduced graphene oxide (denoted CS&rGO), gold nanoparticles (Au-NPs), TiO 2 -NRs, and acetylcholinesterase (AChE) on the surface of a glassy carbon electrode (GCE). The catalytic activity, impedance characteristics, material effects, the relationship between the inhibition rate of the sensor and the dichlorvos (DDVP) concentration, interference studies, real sample detection, and storage stability of the sensor were all evaluated using electrochemical characterization. The sensor’s response to DDVP ranged from 2.26 nM to 565 nM, with a limit of detection of 2.23 nM, and it displayed good repeatability, selectivity, and storage stability.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
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IF 4.65
Jianfei Xiao,Yuan Wang,Tian C. Zhang,Shaojun Yuan
A novel porous carbon derived from glucose and dicyandiamide incorporated with reduced graphene oxide (rGO) was prepared for CO 2 capture and supercapacitors . In this synthesis, one-pot hydrothermal and KOH activation were employed to obtain reducing graphene oxide/N-doped porous carbon (rGO/NPC) composites. Among the rGO/NPC composites derived, the sorbent rGO/NPC-600-2-1 (1 represents the addition amount of graphene oxide is 1% of the total mass of glucose and dicyandiamide, 2 represents the mass ratio of potassium hydroxide to the precursor of carbon composite material is 2 and 600 means activation temperature is 600 °C) had a large surface area of 865.1 m 2 g −1 , a rich nitrogen doping amount of 7.07 wt%, and a high CO 2 capture ability of 5.77 mmol/g at 298 K. Additionally, the as-synthesized rGO/NPC-600-2-1 was used as a supercapacitor electrode, providing a specific capacitance 210.8 F g −1 in 6 M KOH electrolyte under ambient conditions and excellent charge and discharge long cycle stability (circa 100% capacitance retention at a current density of 10 A g −1 after 10000 cycles). Even at a high current density of 20 A g −1 , a capacity of 141.1 F g -1 is still maintained. The results above suggested that the rGO/NPC composites are applicable candidates for both electrochemical energy storage and CO 2 capture.
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高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 14
·6524-6531
·
IF 11.301
Jiadong Li,Feng Wei,Changchang Dong,Wei Mu,Xiaojun Han
Indium oxide (In2O3)-based photocatalysts have great potential in photocatalytic CO2 reduction. Nevertheless, their photocatalytic activity is inhibited by rapid electron–hole recombination. Hence, a novel Z-scheme ternary hierarchical ZnFe2O4/RGO/In2O3 photocatalyst is fabricated for photocatalytic conversion of CO2 to CO and CH4. The CO production rate reaches up to 35.4 μmol g−1 under 4 h of illumination using a 20ZFO/10RGO/IO catalyst, which is 3.9 times and 9.8 times higher than those using bare In2O3 and bare ZnFe2O4, respectively. The CH4 production rate is 7.8 μmol g−1, which is 4.3 fold and 2.4 fold higher, respectively, compared to those from bare In2O3 and bare ZnFe2O4. The enhancement of photocatalytic CO2 reduction was ascribed to a Z-scheme mechanism of the hierarchical catalysts by introducing RGO in-between In2O3 and ZnFe2O4 to promote charge separation and realize efficient utilization of the high-energy electrons and holes. The oxygen-defect of ZnFe2O4 also facilitates the adsorption and activation of CO2. This work provides new insights to design ternary In2O3-based hierarchical photocatalysts with a rational Z-scheme photocatalytic mechanism to improve the CO2 conversion efficiency.
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高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 8
·1-10
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IF 6.232
Zou Lina,Yang Lingxi,Zhan Yi,Huang Di,Ye Baoxian
A photoelectrochemical platform for thrombin determination was developed based on Au-rGO-CuS as multiple signal amplification elements. CuInS 2 QDs was used to sensitize burr-shape TiO 2 (b-TiO 2 ) to obtain a strong photocurrent. Under the specific recognition between aptamer and thrombin, a sandwichlike structure was formed and the Au-rGO-CuS-labeled aptamer (S2@Au-rGO-CuS) was immobilized on the electrode surface. This induced a sharp decrease in photocurrent. The phenomenon is mainly due to the fact that CuS NPs can competitively consume the light energy and electron donor with CuInS 2 /b-TiO 2 . The rGO can increase the amount of CuS NPs and the Au NPs can accelerate charge transferring which depress the recombination of photogenerated electrons and holes in CuS to further enhance the competitive capacity of CuS. The sandwichlike structure has a steric hindrance effect. Therefore, the S2@Au-rGO-CuS has a multiple signal amplification function for thrombin determination. Under optimal conditions, the PEC aptasensor exhibited a wide linear concentration range from 0.1 pM to 10 nM with a low detection limit of 30 fM (S/ N = 3) for thrombin. Besides, the designed aptasensor performed well in the assay of human serum sample, indicating good potential for the determination of thrombin in real samples.
Graphical abstract
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Jiawei Ji,Zheng Zhou,Kun Fu,Chaochao Cao,Jingwen Yang,Yang Huang,Jing Lin,Jun Zhang,Zhenya Liu,Zhonglu Guo,Yi Fang,Yanming Xue,Chengchun Tang
It is believed that the construction of a well-hybridized and nanoscale SnS 2 -rGO interconnection would make Li + diffusion distance shorter, cycle performance stable and high-rate property remarkable application in the LIBs anodes. Here, a novel SnS 2 /rGO aerogel with ultrathin SnS 2 nanosheets, well-hybridized networks, and desirable covalent-bonded interconnection was successfully prepared by a modified one-step hydrothermal method. The aerogels were used for anode of lithium-ion batteries (LIB), and exhibited a remarkable electrochemical performance, including an ultra-high initial specific capacity (1682 mAh g −1 ), excellent rate performance (474 mAh g −1 at the rate of 10 A g −1 ), and perfect cycle stability (1388.4 mAh g −1 after 100 cycles at 0.1 A g −1 ), superior to those of previous reports. It is obvious that the aerogel’s well-hybridized and covalent-bonded networks, super stable and intact structure, and improved electron conductivity would play a very important role during charging/discharging of the improved Li + transportation. Therefore, the SnS 2 /rGO aerogel materials created by us would be a very promising candidate for future advanced lithium-storage-type power sources.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 16
·6355-6361
·
IF 3.288
Ling Jiang,Xiangyang Xu,Jingjing Yuan,Yuanjie Zuo,Yingrui Tao,Dachuan Yao,Guangyu He,Haiqun Chen
Spherical Ni2SnO4 nanoparticles were uniformly loaded on reduced graphene oxide (RGO) sheets via a hydrothermal process. The obtained nickel stannate–reduced graphene oxide (Ni2SnO4–RGO) composite was used as a catalyst for activating persulfate (PS). The heterostructure composed of Ni2SnO4 and RGO prevents both the agglomeration of Ni2SnO4 nanoparticles and the restacking of RGO sheets. The synergy between the two components affords enhanced Ni2SnO4–RGO catalytic activity. Using Ni2SnO4–RGO to activate PS can degrade bisphenol A (BPA) at a faster rate with less PS, in comparison with the most recently reported catalysts. BPA solution (50 mL, 0.10 mM) can be 100% degraded by PS (0.02 g) within 30 min at pH 8 using Ni2SnO4–RGO (0.02 g) as the catalyst. Moreover, the preparation of Ni2SnO4–RGO is simple, inexpensive and environment-friendly. The radical scavenging study indicates that sulfate radicals () and hydroxyl radicals (˙OH) are involved in the oxidation, in which plays a leading role. In addition, Ni2SnO4–RGO retains high catalytic activity after four consecutive cycles, exhibiting greatly enhanced stability in comparison with Ni2SnO4. Besides, the effect of different inorganic anions on the degradation was also explored.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Jiuxuan Zhang,Chunhua Zhang,Hong Jiang,Yefei Liu,Rizhi Chen
Selective hydrogenation of phenol is a green strategy to produce cyclohexanone. Achieving high phenol conversion and cyclohexanone selectivity under mild conditions is a significant challenge in the design and synthesis of highly efficient catalysts. Herein, a highly efficient Pd@CN-rGO catalyst is synthesized by supporting Pd nanoparticles on the composite of ZIF-derived N-doped carbon and reduced GO (CN-rGO), which is prepared via annealing the composite of layered ZIF-L-Co and GO. The as-fabricated Pd1.2@CN-rGO-15 catalyst shows superior catalytic performance in phenol hydrogenation, and its turnover frequency (TOF) is 33.7 h–1, 3.2 times higher than that of Pd1.6/rGO and 1.5 times higher than that of Pd0.9@CN-rGO-0. The synergistic effect of CN and rGO leads to the uniform dispersion of Pd, high phenol adsorption ability, and strong antioxidizability of Pd, which contributes to the superior catalytic performance. More importantly, Pd@CN-rGO has good reusability in phenol hydrogenation. These findings will offer new insights into the development of high-performance catalysts for the selective hydrogenation of phenol.
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高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2020
·
IF 3.333
Leipeng Liu,Ying Lei,Zhicheng Zhang,Jinru Liu,Shenghua Lv,Ziyi Guo
Since dielectric elastomers (DEs) can undergo muscle-like actuation under external electric fields, they show promising applications in fields such as actuators, generators, and biomimetic robots. However, traditional DEs require strong electric fields and pre-stretching to deliver useful deformation, limiting their practical applications. Herein, a novel method for preparing polydimethylsiloxane (PDMS) composites with high actuation under low electric field without pre-stretching is reported. In this method, polydopamine (PDA) is used to modify sandwich-structured silicon dioxide@graphite oxide hybrids (PDA@SiO 2 @GO). The inclusion of the SiO 2 layer improves the dielectric constant and reduces the dielectric loss of the composite, while the PDA shell improves the dispersibility of the filler. The PDA@SiO 2 @rGO/PDMS composite containing 5 wt% PDA@SiO 2 @GO exhibits a large actuated strain of 14.23% under an electric field of 33.19 kV/mm without pre-stretching; this value is 465% larger than that of pure PDMS and superior to those of most reported DEs composites. The results provide a promising new route to prepare high-performance DEs.
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高影响因子
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