Materials Today Energy
·
2020
·
IF 5.604
Jun Xu,Rixin Wang,Xing Chen,Ru Zhou,Junjun Zhang
Copper-containing bimetallic sulfides are regarded as an emerging low-cost catalyst for electrocatalytic hydrogen generation. In this work, we report for the first time the ternary Cu 2 SnS 3 (CTS) nanocrystals anchored reduced graphene oxide (rGO) nanosheets (CTS@rGO) as a superior electrocatalyst for efficient hydrogen generation. The CTS nanocrystals with 5–10 nm are much homogeneously distributed on the surface of rGO nanosheets. In the CTS@rGO composite, the rGO works as a robust scaffold that can effectively suppress aggregation of the CTS nanocrystals and ensure more exposed active sites on CTS surfaces. Furthermore, the conductive rGO is beneficial to fast charge transfer. Therefore, the CTS@rGO catalyst possesses a large electrocatalytic active surface area and a small charge transfer resistance. As a result, the CTS@rGO exhibits significantly enhanced catalytic activity for hydrogen evolution reaction (HER) in both the acid and alkaline electrolytes in comparison with the pristine CTS nanocrystals. The CTS@rGO delivers a striking catalytic kinetic metrics of a small Tafel slope of 54 mV dec −1 , a low overpotential of 252 mV at a current density of 10 mA cm −2 , long operation stability of 4 day in the acid electrolyte.
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高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 9
·1633
·
IF 4.324
Zhi Zhang,Zichuan Yi,Liming Liu,Jianjun Yang,Chongfu Zhang,Xinjian Pan,Feng Chi
Lithium-sulfur battery (LSB) will become the next generation energy storage device if its severe shuttle effect and sluggish redox kinetics can be effectively addressed. Here, a unique three-dimensional hollow reduced graphene oxide microsphere decorated with ZnO nanoparticles (3D-ZnO/rGO) is synthesized to decrease the dissolution of lithium polysulfide (LiPS) into the electrolyte. The chemical adsorption of ZnO on LiPS is combined with the physical adsorption of 3D-rGO microsphere to synergistically suppress the shuttle effect. The obtained 3D-ZnO/rGO can provide sufficient space for sulfur storage, and effectively alleviate the repeated volume changes of sulfur during the cycle. When the prepared S-3D-ZnO/rGO was used as the cathode in LSB, an initial discharge specific capacity of 1277 mAh g−1was achieved at 0.1 C. After 100 cycles, 949 mAh g−1can still be maintained. Even at 1 C, a reversible discharge specific capacity of 726 mAh g−1was delivered.Keywords:ZnO;graphene;spray drying;hollow structure;lithium-sulfur battery
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 47
·18601-18610
·
IF 3.069
Siwen Xia,Yu Yang,Changli Lü
Functionalized two-dimensional graphene oxide sheets and their inorganic–organic nanohybrids have aroused great interest because of their excellent synergetic effect on metal-based nanocatalyst PdNPs supported on highly hydrophilic quaternized polyhedral oligomeric silsesquioxane (QPOSS) functionalized reduced graphene oxide (rGO) and were successfully constructed as a nanohybrid catalyst for efficient heterogeneous catalytic reactions. Octaammonium POSS (OAPOSS) was first covalently grafted to carboxylated GO nanosheets through an amidation reaction, and then the OAPOSS decorated on rGO nanosheets was quaternized with glycidyltrimethylammonium chloride (GDTMAC) via an epoxide ring-opening reaction to obtain a highly functional hydrophilic QPOSS@rGO hybrid. Finally, the PdNPs were loaded onto QPOSS@rGO nanosheets through an in situ reduction route. The quaternary ammonium groups on QPOSS@rGO can strongly coordinate with PdNPs, making it particularly advantageous for stabilizing PdNPs and preventing the leaching of Pd metals. Compared to the PdNPs@rGO catalyst without modification with hydrophilic QPOSS, the low-dose PdNPs@QPOSS@rGO nanocatalysts exhibited outstanding catalytic efficiency in the reduction of methylene blue and nitrophenols. In addition, the as-designed nanocatalysts also showed high catalytic activity for the Suzuki coupling reaction when utilizing pure water as a green solvent. It was proved that QPOSS and rGO can synergistically catalyze and promote the diffusion of reactants. In particular, the PdNPs@QPOSS@rGO nanohybrid catalyst showed no significant loss of catalytic activity after reusing it five times. Our results demonstrated that highly hydrophilic QPOSS endows the resulting PdNPs@QPOSS@rGO nanohybrid with good dispersibility and stability in water, which remarkably further improves the catalytic activity of the nanocatalyst.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Bingbing Hu,Chuanlan Xu,Muhammad Kashif Aslam,Yuan Cen,Jiahong Hu,Yan Li,Yuping Liu,Chaozhong Guo,Danmei Yu,Changguo Chen
In this work, multilayer networks lanthanum-doped V 2 O 5 · n H 2 O@OAB (noted as La-VOH@OAB) binder-free thin film positive electrode has been first successfully synthesized via a simple and economical sol-gel and drop-coating methods. Benefiting from its unique architecture and the favorable synergetic contributions for rare earth metal ions of La 3+ and hydrophilic carbon of OAB, after the condition optimization, the 20%La-VOH@OAB-4 exhibits an excellent electrochemical performance with an ultrahigh specific capacitance of 612 F g −1 at a current density of 1 A g −1 , good rate capability (81.1%, the current density increases tenfold) and outstanding cycling stability (90.4% capacitance retention over 2000 cycles). In addition, flexible Fe 2 O 3 @rGO binder-free thin film negative electrode prepared with the similarly facile strategy demonstrates a high specific capacitance of 366 F g −1 due to Fe 2 O 3 nanoparticles tightly anchored on the rGO surface. The assembled 20%La-VOH@OAB-4//Fe 2 O 3 @rGO ASCs device within a voltage window of 1.7 V delivers a relatively high specific energy density of 56.3 Wh kg −1 at a power density of 849.9 W kg −1 with exceptional cycling stability (81.3% capacitance retention after 5000 cycles), moreover, two ASCs devices in parallel can light up a red LED for 3 min, demonstrating its potential in practical applications. This work provides a certain reference for the fabrication of environmentally friendly thin film electrodes for developing high efficient energy storage systems.
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高影响因子
Catalysts
·
2019
·Vol. 9
·期 10
·848
·
IF 3.444
Cheng Gong,Shiyin Xu,Peng Xiao,Feifan Liu,Yunhui Xu,Jin Yang,Rui Li,Xuan Wang,Jun Du,Hailong Peng
A hybrid material of indium tin-oxide (ITO) wrapped titanium dioxide and reduced graphene oxide (ITO-rGO and TiO2) was prepared using a facile hydrothermal technique. TiO2nanorods were in situ grown on the surface of rGO (rGO and TiO2), and which was then assembled onto ITO substrate layer by layer with formation of a 3D structure. ITO-rGO and TiO2exhibit low charge transfer resistance at the electrode-electrolyte interface and have good photoresponsive ability. Methylene blue (MB) can be effectively adsorbed and enriched onto ITO-rGO and TiO2surface. The adsorption kinetics and thermodynamics of ITO-rGO and TiO2were evaluated, showing that the exothermic and entropy-driven reaction were the main thermodynamic processes, and the Langmuir isotherm was the ideal model for adsorption fitting. Meanwhile, ITO greatly improved degradation of rGO and TiO2because electrons can be collected by ITO before recombination and MB can easily enter into the 3D structure of rGO and TiO2. The highest photodegradation rate of MB reached 93.40% for ITO-rGO and TiO2at pH 9. Additionally, ITO-rGO and TiO2successfully solved the problems of being difficult to recycle and causing secondary pollution of traditional TiO2catalysts. Therefore, ITO-rGO and TiO2may be a potential photocatalyst for degrading organic pollutants in water.Keywords:ITO-rGO and TiO2;methylene blue;photocatalysis;adsorption;mechanisms
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 46
·18240-18250
·
IF 3.069
Xiaoying Hu,Qi Zhang,Haoshan Nan,Ming Wang,Liang Qiao,Hongwei Tian
Compared to the traditional type II heterojunction photocatalyst (Cu2O/BiVO4), bulk BiVO4 was modified in this study by reduced graphene oxide (RGO) with a Schottky structure to optimize the coupling interface of BiVO4. Cu2O nanoparticles were then grown in situ on the RGO/BiVO4 surface to yield a heterojunction structure with an internal electric field, allowing movement of photogenerated electrons and holes in opposite directions to participate in redox reactions. The as-obtained optimized Cu2O/RGO/BiVO4 material exhibited excellent photocatalytic degradation performance towards organic pollutants. The reaction rate constant of rhodamine B (RhB) was estimated as 0.0324 min−1, which was almost 5.94, 5.15 and 1.94-fold higher than those of bare BiVO4, 4%RGO/BiVO4 and 5%Cu2O/BiVO4, respectively. Moreover, the optimized material displayed good activity in the degradation of the colorless organic contaminant tetracycline hydrochloride (TC). The reaction rate constant was estimated as 0.0219 min−1, which was almost 1.6-, 1.4- and 1.63-fold higher than those of bare BiVO4, 4%RGO/BiVO4 and 5%Cu2O/BiVO4, respectively. The hole and superoxide radical worked as active species for degradation of organic matter. Such a significant increase in degradation efficiencies was attributed not only to the formation of a heterojunction structure but also to rapid electron transfer between interfaces.
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高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Jiawei Ji,Zheng Zhou,Chaoze Liu,Song Yan,Shaobo Yang,Rongjuan Zhang,Yanming Xue,Chengchun Tang
The two-dimensionally layered material tin disulfide (SnS2) has a large layer spacing (0.59 nm) that accelerates the diffusion of Li+ and electrons. However, the poor conductivity and huge volume expansion limit its further use. Herein, a covalently tightly assembled SnS2@NRGO hybrid nanostructure with high porosity was successfully synthesized by sacrificing PMMA template support strategies. The high porosity and pore volume of SnS2@NRGO not only increases the permeability of active material and electrolyte and improves the utilization of active material, but also provides buffer space for the huge volume expansion of ultrathin SnS2 during the charging and discharging process. In addition, the strong synergistic effect of the covalent bonding and stable hybridization nanostructure provides an efficient Li+ transport path through the 3D tightly connected NRGO network. N doping introduces a large number of defects and adds more active sites for lithium intercalation. The SnS2@NRGO-3 used as the anodes for LIBs deliver excellent rate performance (540.1 mAh g–1 at a rate of 30 A g–1) and outstanding cycle stability (1031.9 mAh g–1 after 500 cycles at 5 A g–1; the capacity degradation rate of 0.048% per cycle), which attributed to stable hybrid nanostructure and high pore volume. Therefore, the SnS2@NRGO created by us would be a very promising candidate for the future advanced high-rate long-life Li+ storage anode.
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高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Jintao Liang,Fei Guo,Jiaying Huang,Xiaohong Tan,Lixian Sun,Zhide Zhou,Guiyin Li
Golgi protein-73(GP73) is one of the most common biomarkers with outstanding sensitivity and specificity in the diagnosis of hepatocellular carcinoma. Herein an ultrasensitive label-free electrochemical aptasensing platform was constructed for GP73 detection based on reduced graphene oxide-ferrocene formic acid-tripterythrine tetroxide nanocomposites (RGO-Fc-Mn 3 O 4 ) and GP73 aptamer (GP73 Apt ). Gold@poly-o-phenylenediamine (Au@PoPD) was electrodeposited on the surface of screen-printed electrode (SPE) as the conductive substrate. RGO-Fc-Mn 3 O 4 was then drop-coated on Au@PoPD/SPE as a signal probe to generate measurable redox peaks due to the electroactivity of Fc in RGO-Fc-Mn 3 O 4 . GP73 Apt was anchored on the surface of RGO-Fc-Mn 3 O 4 NPs/Au@PoPD/SPE to constitute an electrochemical aptasensing biosensor. When GP73 was captured via the specific affinity of GP73 Apt and formed GP73-GP73 Apt complex onto the aptasensing platform, the formation GP73-GP73 Apt complex impeded the electron transfer on the electrode interface, resulting in a decrease in the peak current recorded by differential pulse voltammetry method. Thus, GP73 can be detected by measuring the change of Fc redox peak current in RGO-Fc-Mn 3 O 4 . Log-linear calibration curve for GP73 concentration (0.01–1000 ng/mL) was obtained with good correlation coefficients of 0.99485 and a lower limit of detection of 0.01 ng/mL. The human serum samples were tested by direct detection method, and the relative error and relative standard deviation are 4.21–9.87% and 3.28–9.40%, respectively. All these results demonstrate that the proposed aptasensor would be a promising tool for clinical analysis of GP73 in the diagnosis of hepatocellular carcinoma.
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高影响因子
ANALYTICAL LETTERS
·
2023
·
IF 2
Yu Yan,Si Zeng,Fang Xu,Yongmei Hu,Haiping Huang
Acetaminophen (AP) is one of the most commonly used antipyretics. Accurate and efficient determination of its concentration is of great significance to human health. In this work, FeNi alloy nanoparticles and reduced graphene oxide (rGO) were compounded by an ultrasonic method to obtain FeNi/rGO nanocomposites. The nanocomposites were analyzed by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), and cyclic voltammetry (CV). Due to the catalytic activity of FeNi alloy nanoparticles and the synergy between the high specific surface area and conductivity of reduced graphene oxice (rGO), a FeNi/rGO nanocomposite showed excellent electrocatalysis for acetaminophen determination. With differential pulse voltammetry (DPV) as the analytical method, the linear range for acetaminophen is from 1 to 100 and 100 to 3,000 μM with a limit of detection (LOD) equal to 0.3 μM. Moreover, the sensor also has good reproducibility and selectivity with high recoveries in practical analysis.
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高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 38
·12999-13009
·
IF 6.4
Jinjuan Li,Jing Hu,Nan Li,Miao Cheng,Tao Wei,Qianqian Liu,Ruirui Wang,Wanfei Li,Yun Ling,Yafei Zhang,Bo Liu
Conventional metal oxide semiconductor gas sensors often suffer from high operating temperatures, low selectivity, and complex synthesis processes for NO2 detection. In this work, reduced graphene oxide (rGO) nanosheets are coated on NaOH-etched Cu2O/CuO urchin-like spheres to form Cu2O/CuO@rGO composites via a one-step green synthesis method at room temperature (RT). The gas sensor based on this material has been utilized for detecting NO2 at RT (25 °C), and the effects of Cu2O addition and reaction time on the morphology as well as gas-sensing properties of the as-prepared sensor are investigated. Of interest, the sensor based on the 550Cu2O/CuO@rGO-5 composite has an ultra-high response (S = 871) to 5 ppm NO2 gas at RT with a response/recovery time of 32/73 s, and the detection limit is as low as 90.6 ppt. In addition, the gas sensor shows excellent selectivity and repeatability. The excellent sensing performance of the as-prepared 550Cu2O/CuO@rGO sensor is attributed to the framework structure of Cu2O/CuO@rGO, the urchin-like hierarchical structure of the Cu2O/CuO and the synergistic effect of the p–p (Cu2O–CuO) heterojunction. This exploration of the present work offers a good reference for mass, green, and low-power sensing material preparation.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Wenyan Huang,Yufeng Wang,Zhonghao Ning,Shengjian Mao,Zhichao Xue,Yeqi Zhu,Qianwen Tao,Siqi Lan,Rongqian Yao
Making lightweight SiC composite ceramics with good load-bearing and remarkable surficial antioxidant capacity for use in thermal protection system is challenging. In this contribution, an ingenious strategy is reported to produce SiC(Mo x , rGO) nanocomposite polymer-derived ceramics (PDCs) for the first time by reactively re-pyrolyzing flexible polymolybdenumcarbosilane-vinyltriethoxysilane-graphene oxide (PMVG)/rigid SiC(Mo x , rGO) p fillers blends. Highly cross-linked PMVG precursors connect up to five polycarbosilane (PCS) to optimize their formability. In-situ formed MoSi 2 and Mo 4.8 Si 3 C 0.6 , compatible with β-SiC/SiO x C y /C free (rGO) matrix, can effectively strengthen interface bonding, promote nailing cracks, and even hinder β-SiC grain growth. More interestingly, using in-situ SiC nanowires (SiC nws ) by Mo-containing catalyst to decorate samples is an efficient route to reinforce the ceramic network, and SiC nws /SiC(Mo 0.1 , rGO) nanocomposite PDCs display optimal Vickers hardness (5.19 GPa), enhanced fracture toughness (4.26 MPa·m 1/2 ), high compressive strength (151.73 MPa), and low linear shrinkage (4.75%). Such products remain stability/integrity under flame scouring, their surface is covered by a dense SiO 2 passivation layer with good self-healing capacity owing to unique non-destructive oxides of embedded MoSi 2 /Mo 4.8 Si 3 C 0.6 . This work can further provide a feasible way to overcome the critical fabrication process in lightweight porous PDCs with well-balanced high load-bearing and good thermal insulation integration for aerospace vehicle components.
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高影响因子
Catalysts
·
2023
·Vol. 13
·期 6
·1012
·
IF 3.9
Jia Wang,Yongfu Lian
The poor conductivity and instability of layered dihydroxides (LDHs) limit their widespread application in oxygen evolution reaction (OER). In this study, the composite electrode of NiMn-LDHs, reduced graphene oxide (rGO) and nickel foam (NF), i.e., NiMn-LDHs/rGO/NF, was prepared by a hydrothermal method. When subjected to oxygen evolution reaction (OER) catalytic performance in a solution of 1 M KOH, the NiMn-LDHs/rGO/NF composite catalyst exhibited an overpotential of only 140 mV at a current density of 10 mA cm−2and a Tafel slope of 49 mV dec−1, which is not only better than the comparing RuO2/NF catalyst, but also better than most of the Mn-based and the Ni–Fe-containing bimetallic OER catalysts reported in the literature. The excellent electrocatalytic performance is ascribed to the efficient integration of ultrathin NiMn-LDH sheets, thin-layered rGO and NF, contributing significantly to the decrease in charge transfer resistance and the increase in electrochemically active surface area. Moreover, NF plays a role of current collector and a role of rigid support for the NiMn-LDHs/rGO composite, contributing extra conductivity and stability to the NiMn-LDHs/rGO/NF composite electrode.
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高影响因子
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