ACS Applied Materials & Interfaces
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2018
·
IF 8.097
Ranran Ding,Jie Zhang,Jie Qi,Zhenhua Li,Chengyang Wang,Mingming Chen
To address the issues of low electrical conductivity, sluggish lithiation kinetics and dramatic volume variation in Fe3O4 anodes of lithium ion battery, herein, a double carbon-confined three-dimensional (3D) nanocomposite architecture was synthesized by an electrostatically assisted self-assembly strategy. In the constructed architecture, the ultrafine Fe3O4 subunits (∼10 nm) self-organize to form nanospheres (NSs) that are fully coated by amorphous carbon (AC), formatting core–shell structural Fe3O4/AC NSs. By further encapsulation by reduced graphene oxide (rGO) layers, a constructed 3D architecture was built as dual carbon-confined rGO/Fe3O4/AC. Such structure restrains the adverse reaction of the electrolyte, improves the electronic conductivity and buffers the mechanical stress of the entire electrode, thus performing excellent long-term cycling stability (99.4% capacity retention after 465 cycles relevant to the second cycle at 5 A g–1). Kinetic analysis reveals that a dual lithium storage mechanism including a diffusion reaction mechanism and a surface capacitive behavior mechanism coexists in the composites. Consequently, the resulting rGO/Fe3O4/AC nanocomposite delivers a high reversible capacity (835.8 mA h g–1 for 300 cycles at 1 A g–1), as well as remarkable rate capability (436.7 mA h g–1 at 10 A g–1).
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高影响因子
CRYSTENGCOMM
·
2018
·Vol. 20
·期 43
·7010-7019
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IF 3.304
Ming Zhang,Fengqi Zhao,Yanjing Yang,Jiankan Zhang,Na Li,Hongxu Gao
rGO–Fe2O3 composites were prepared using different solvents (distilled water, ethanol, N-methylpyrrolidone, ethyl acetate, n-butyl alcohol and N,N-dimethylformamide) via a simple solvothermal method and characterized by SEM, TEM, XRD, FT-IR, Raman and XPS techniques. Then, the catalytic action of rGO–Fe2O3 composites (prepared in different solvents), GO, rGO and pristine Fe2O3 on the thermal decomposition of ammonium perchlorate (AP) were studied using a TG-DSC instrument. DSC results showed that GO, rGO, pristine Fe2O3 and rGO–Fe2O3 composites could effectively promote the thermal decomposition of AP. Additionally, rGO–Fe2O3 fabricated in N,N-dimethylformamide (DMF) solvent possesses the best catalytic performance among the investigated materials. This result can be attributed to the better dispersibility of Fe2O3 nanoparticles on graphene oxide prepared in DMF solvent, which was confirmed by SEM and TEM imaging. The high temperature decomposition exothermic peak (HTP) and the apparent activation energy of AP are reduced by 119.6 °C and 173.3 kJ mol−1, respectively, in the presence of Fe2O3–rGO (DMF) composite.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
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IF 4.229
Ying-Hua Zhou,Zhiyan Zhang,Suqin Wang,Nicholas Williams,Yong Cheng,Shizhong Luo,Jing Gu
The hydrogen economy is a proposed system that utilizes hydrogen to deliver energy. For the realization of this concept, how to safely, controllably and reversibly store and release hydrogen are critical problems which must be resolved. Metal alloys combined with suitable support materials are widely applied to various catalytic reactions . Here palladium nickel bimetallic nanoparticles doped with cerium oxide on a reduced graphene oxide (rGO) support were prepared by combining metal ion precursors and graphene oxide in a one-pot co-reduction approach. The as-received catalysts were characterized by XRD , TEM, SEM, XPS and ICP-OES, and the results revealed that PdNi-CeO 2 nanoparticles were uniform dispersal on rGO. The as-synthesized PdNi-CeO 2 /rGO had been adopted as a heterogeneous catalyst for the hydrogen evolution from the hydrolysis of ammonia borane (NH 3 BH 3 , AB) at room temperature . Kinetically, the hydrogen-release rate was first-order with the increased concentration of catalysts. The optimized catalyst of Pd 0.8 Ni 0.2 -CeO 2 /rGO with the CeO 2 content of 13.9 mol% exhibited an excellent activity with a turnover frequency value of 30.5 mol H 2 (mol catalyst) −1 min −1 at 298 K, and a low apparent activation energy ( E a ) of 37.78 kJ mol −1 . The robust catalytic performance of the Pd 0.8 Ni 0.2 -CeO 2 /rGO is attributed to the uniform controlled nanoparticle size, the synergic effect between the nanoparticles bimetallic properties, and the effective charge transfer interactions between the metal and support.
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Nanoscale
·
2018
·Vol. 10
·期 21
·10033-10040
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IF 7.233
Gang Ge,Yichen Cai,Qiuchun Dong,Yizhou Zhang,Jinjun Shao,Wei Huang,Xiaochen Dong
High-performance stretchable and wearable electronic skins (E-skins) with high sensitivity and a large sensing range are urgently required with the rapid development of the Internet of things and artificial intelligence. Herein, a reduced graphene oxide (rGO)/polyaniline wrapped sponge is prepared via rGO coating and the in situ synthesis of polyaniline nanowires (PANI NWs) on the backbones of sponge for the fabrication of pressure sensors. From the as-prepared flexible sensor, tunable sensitivity (0.042 to 0.152 kPa−1), wide working range (0–27 kPa), fast response (∼96 ms), high current output (∼300 μA at 1 V), frequency-dependent performance reliable repeatability (∼9000 cycle) and stable signal waveform output can be readily obtained. In addition to tiny physiological activities (voice recognition, swallowing, mouth opening, blowing and breath), robust human motions (finger bending, elbow movement and knee squatting–arising) can also be detected in real-time by the flexible sensors based on rGO/polyaniline wrapped sponge. All the results demonstrate that the flexible pressure sensor based on the functional-sponge is a promising candidate for healthcare monitoring and wearable circuitry in artificial intelligence.
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RSC Advances
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2019
·Vol. 9
·期 26
·15033-15041
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IF 3.049
Ya Gao,Yongjie Zheng,Jixing Chai,Jingzhi Tian,Tao Jing,Deqing Zhang,Junye Cheng,Huiqing Peng,Bin Liu,Guangping Zheng
Effective separation and rapid transfer of photogenerated electron–hole pairs are key features of photocatalytic materials with high catalytic activity, which could be achieved in co-catalysts. It is reported that the two-dimensional (2D) MoS2 is a promising co-catalyst due to its unique semi-conductive properties and graphene-like layered structure. However, the application of MoS2 as a co-catalyst is limited by its poor electrical conductivity. On the other hand, it is worth noting that TiO2 possesses reactive crystal facets, which is one of the dominant mechanisms for the separation of photogenerated electron–hole pairs. In this work, we prepared MoS2/RGO hybrids as co-catalysts which were doped to TiO2 with highly reactive {001} planes via the hydrothermal method. It was found that the {001}-TiO2/MoS2/RGO photocatalysts with 7 wt% MoS2/RGO co-catalyst show the highest photodegradation activity for the degradation of Rh B under visible light irradiation (λ > 400 nm), which could result from the synergy of the effective separation of electron–hole pairs by the {001} facets in TiO2 and the rapid transfer of electron–hole pairs in MoS2/RGO. The results show that the {001}-TiO2/MoS2/RGO hybrid is a low-cost and stable photocatalyst for the effective degradation of Rh B under visible light.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
·
IF 11.698
Zhenying Jiang,Lingzhi Wang,Juying Lei,Yongdi Liu,Jinlong Zhang
The application of photo-Fenton process is restricted by the acidic pH and additional hydrogen peroxide (H 2 O 2 ). In order to overcome these drawbacks, a photo-Fenton system of CdS/rGO/Fe 2+ which can perform at natural pH with in situ -generated H 2 O 2 has been successfully developed. Highly efficient photo-Fenton degradation of phenol was achieved under the visible light irradiation via the CdS/rGO/Fe 2+ system. Experimental results showed that phenol could be degraded completely in 1 h at natural pH. The plentiful in situ generation of H 2 O 2 was further proved to act as an important role in phenol degradation with the addition of Fe 2+ . The advantages of degradation at natural pH with in situ -generated H 2 O 2 can provide a new prospective to the environmental-friendly Fenton process.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2018
·Vol. 24
·期 52
·13830-13838
·
IF 5.16
Xiangming Li,Yihe Zhang,Zequn Ma,Meng Fu,Qi An
Graphical The heat is on : A facile and efficient approach for the preparation of pH responsive self-assembled (electrostatic interactions) rGO-polymer-DOX nanocomposites for photothermal and chemical therapy is reported (see figure). The development of well-controlled drug carriers that are stable and highly effective for the delivery of anticancer agents is challenging. Herein, we report a novel pH-controlled drug delivery system, utilizing reducing graphene oxide (rGO)-polymer self-assembly films as carriers, for the preparation of effective drug nanorods and nanoparticles. In this system, the rGO-polymer carriers were constructed by the alternating assembly of poly- l -lysine (PLL) and polyaspartic acid (PASP) around the rGO sheets. Furthermore, the rGO-polymer cores, which possess a positively charged surface as the desired template, could assemble with negatively charged doxorubicin (DOX) via electrostatic interactions. The DOX embedding efficiency and the morphology of the drug nanocomposites could be controlled by the number of rGO-polymer bilayers and concentration of the rGO-polymer bilayers and the initial DOX concentration. Importantly, the release of DOX could be regulated by controlling the pH and by using a NIR laser. Under acidic conditions, the interactions between the PASP layer and DOX molecules can be broken, resulting in gradual release of the DOX molecules. Upon NIR irradiation, the release of DOX could be further accelerated and a photothermal effect from rGO induced. Cellular uptake and cytotoxicity experiments indicate that the drug nanocomposites possess effective anticancer activity. Thus, in this work, we present a useful strategy for the fabrication of pH-responsive drug nanocomposites for combined photothermal and chemical therapy. The nanocomposite can be used as a potential drug delivery system for practical cancer treatment.
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JOURNAL OF ENZYME INHIBITION AND MEDICINAL CHEMISTRY
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2018
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IF 3.638
Songsong Zhang,Beibei Qiu,Jinhua Zhu,Weiping Hu,Fanyi Ma,M. Z. H. Khan,Xiuhua Liu
Present study aimed to immobilise the α-glucosidase on suitable supports to construct enzymatic microreactors and their subsequent applicability in efficient inhibitor screening from the Chinese Yam (Dioscorea opposita Thunb.) peel. A type of lamellar and porous composites (rGO@Fe3O4) were synthesised with a facile one-step solvothermal method and employed as carriers to construct enzymatic microreactors for screening α-glucosidase ligand from the Chinese Yam peel in league with the high performance liquid chromatography and mass spectrometry (HPLC-MS). The immobilisation amount of α-glucosidase on rGO@Fe3O4 under the optimised conditions was about 40 μg α-glucosidase/mg carriers. Furthermore, the binding capacities of screened inhibitors, 2,4-dimethoxy-6,7-dihydroxyphenanthrene and batatasin I, were 35.6 and 68.2%, respectively. Hence, considering their high screening efficiency and excellent magnetic separation ability, these as-prepared nanocomposite consisting of rGO and Fe3O4 may be potential supports for the enzyme (such as α-glucosidase) immobilisation for rapid α-glucosidase inhibitors screening from the diverse nature resources.
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BIOSENSORS & BIOELECTRONICS
·
2017
·
IF 7.78
Jingyi Luo,Danfeng Jiang,Tao Liu,Jingmeng Peng,Zhenyu Chu,Wanqin Jin
In this work, a novel sandwich-type aptasensor was designed for the ultrasensitive recognition of trace mercury ions in water. Numerous oriented platinum nanotube arrays (PtNAs) were in-situ crystallized on a flexible electrode as a sensing interface, while thionine labelled Fe 3 O 4 /rGO nanocomposites as signal amplifiers. Both PtNAs/CF and nanocomposites were synthesized by easy hydrothermal processes. With their large surface area, it was favorable for electrochemical performance and immobilization of capture DNAs (cDNA) and report DNAs (rDNA). Upon the existence of Hg 2+ , partial linker DNAs were tightly bound with cDNAs through thymine-Hg 2+ -thymine pairing (T-Hg 2+ -T). Then rDNAs attached Fe 3 O 4 /rGO nanoprobes were fixed on the electrode through the match of remaining linker DNAs and rDNAs. Under the optimal conditions, the Hg 2+ aptasensor showed a synergistic amplification performance with a wide linear range from 0.1nM to 100 nM, as well as a low detection limit of 30 pM. Moreover, the as-prepared aptasensor also exhibited reliable performance for assay in real lake water samples.
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ANALYST
·
2017
·Vol. 142
·期 24
·4852-4861
·
IF 3.885
Jin Wang,Hui Xu,Shumin Li,Bo Yan,Yuting Shi,Caiqin Wang,Yukou Du
Plasmonic photocatalyst has attracted significant attention due to its valuable theoretical study and promising practical applications in solar cells, functional composites, and sensors. Herein, an interesting RGO–C3N4-supported AuAg core–Au shell (AuAg@Au) nanocomposite has been reported. Due to the surface plasmon resonance (SPR) of AuAg@Au and the accelarated electron transfer and separation of charge carriers induced by the fascinating RGO–C3N4 substrate, the newly-generated AuAg@Au/RGO–C3N4 nanomaterials show a strong photo-electrochemical response under visible-light irradiation. The AuAg@Au/RGO–C3N4 photocatalyst demonstrated an excellent photo-electrochemical performance with a broad concentration linear range of 0.064–780.904 μM and a low detection limit of 0.022 μM, high stability, and good selectivity when applied in the determination of dopamine (DA) under visible-light irradiation.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2017
·Vol. 93
·期 3
·761-775
·
IF 3.135
Qi Chen,Zongxue Yu,Fei Li,Yang Yang,Yang Pan,Yixin Peng,Xi Yang,Guangyong Zeng
BACKGROUND Membrane separation is a promising process for treatment of dye and oily wastewater if the antifouling capacity and recyclability can be improved. In recent years, the development of photocatalytic materials has provided new methods for research into membrane technology. RESULTS In this study, a novel photocatalytic membrane decorated with RGO-Ag-TiO 2 nanomaterial was fabricated by simple vacuum filtration for degradation of dye and separation of oil–water. First, TiO 2 nanowires were prepared for more effective photocatalysis, reduced graphene oxide (RGO)-Ag-TiO 2 was fabricated by a facile hydrothermal reaction, then it was directly decorated on cellulose acetate (CA) membrane using polyethylene glycol and glutaraldehyde. CONCLUSION The as-prepared photocatalytic membrane can simultaneously degrade dye and separate oil–water emulsions under visible-light irradiation in a short time. The membrane has extremely high water flux (191 L m -2 h -1 ) and rejection rates (almost 100%) of dye–oil–water emulsion. More importantly, the photocatalytic membrane shows excellent antifouling capacity and recyclability, and retains relatively stable dye–oil–water permeation flux (about 27.5 L m -2 h -1 ) and high rejection rates (up to 99%) after six cycles of experiments under visible-light irradiation. Overall, the photocatalytic membrane opens up new avenues for the treatment of wastewater. © 2017 Society of Chemical Industry
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CHEMICAL PAPERS
·
2024
·
IF 2.1
Liu Zitong,Liu Jiali
Green water-based paint cannot exhibit antibacterial property. For good antibacterial property, ZnO/reduced graphene oxide (rGO) nanofiller was added. Graphene oxide and ZnO/rGO composite were synthesized. Then, ZnO/rGO/paint composite coating with excellent antibacterial property was prepared. As ZnO content in ZnO/rGO filler is increased, antibacterial property of coating is improved. In fighting against Escherichia coli and Staphylococcus aureus , pristine coating shows low antibacterial rates of 0.50% and 0.48%, respectively. When ZnO was added, antibacterial rates of coating were be increased to 49.31% and 41.67%. When ZnO/rGO filler was used, antibacterial rates were increased to 65.46% and 62.17%. At a higher load of ZnO/rGO filler, antibacterial rates reached 93.37% and 83.38%. Friction coefficient of ZnO/rGO/paint composite coating was decreased to 0.53 compared with original coating. At a higher dose of ZnO/rGO filler, friction coefficient was decreased to 0.40. Properties of ZnO/rGO/paint coating meet a national standard for water-based wood coatings for indoor decoration. This composite coating with excellent antibacterial property and wear resistance can be applied in eco-friendly indoor decoration.
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