Nanomaterials
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2020
·Vol. 10
·期 12
·2449
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IF 4.324
Shiliang Heng,Lei Li,Weiwei Li,Haiyan Li,Jingyu Pang,Mengzhen Zhang,Yan Bai,Dongbin Dang
The development of high-efficiency, recyclable, and inexpensive photocatalysts for water splitting for hydrogen production is of great significance to the application of solar energy. Herein, a series of graphene-decorated polyoxoniobate photocatalysts Nb6/PPy-RGO (Nb6= K7HNb6O19, RGO = reduced graphene oxide, PPy = polypyrrole), with the bridging effect of polypyrrole were prepared through a simple one-step solvothermal method, which is the first example of polyoxoniobate-graphene-based nanocomposites. The as-fabricated photocatalyst showed a photocatalytic H2evolution activity without any co-catalyst. The rate of 1038 µmol g−1in 5 h under optimal condition is almost 43 times higher than that of pure K7HNb6O19·13H2O. The influencing factors for photocatalysts in photocatalytic hydrogen production under simulated sunlight were studied in detail and the feasible mechanism is presented in this paper. These results demonstrate that Nb6O19acts as the main catalyst and electron donor, RGO provides active sites, and PPy acted as an electronic bridge to extend the lifetime of photo-generated carriers, which are crucial factors for photocatalytic H2production.Keywords:polyoxoniobate;Nb6/PPy-RGO composites;electronic bridge;H2production
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Materials Science & Engineering C-Materials for Biological Applications
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2020
·
IF 5.88
Yuanyuan Li,Li Tang,Dongmei Deng,Haibo He,Xiaoxia Yan,Jinhua Wang,Liqiang Luo
The construction of metal-oxide heterojunction architecture has greatly widened applications in the fields of optoelectronics, energy conversions and electrochemical sensors. In this study, olive-like hetero-structured MnO-Mn 3 O 4 microparticles wrapped by reduced graphene oxide (MnO-Mn 3 O 4 @rGO) were synthesized through a facile solvothermal-calcination treatment. The morphology and structure of MnO-Mn 3 O 4 @rGO were characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, and X-ray diffraction. The as-synthesized MnO-Mn 3 O 4 @rGO exhibited prominent catalyzing effect on the electroreduction of H 2 O 2 , due to the combination of good electrical conductivity of rGO and the synergistic effect of MnO and Mn 3 O 4 . The MnO-Mn 3 O 4 @rGO modified glassy carbon electrode provided a wide linear response from 0.004 to 17 mM, a low detection limit of 0.1 μM, and high sensitivity of 274.15 μA mM −1 cm −2 . The proposed sensor displayed noticeable selectivity and long-term stability. In addition, the biosensor has been successfully applied for detecting H 2 O 2 in tomato sauce with good recovery, revealing its promising potential applications for practical electrochemical sensors.
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Journal of the Taiwan Institute of Chemical Engineers
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2020
·
IF 4.794
Xuan Jing,Li Chen,Yaxin Wang,Yunyun Wang,Xinyan Yang,Jiangdong Dai,Xiaohui Dai,Yinhua Jiang,Yan Liu,Zhanchao Liu,Yongsheng Yan
Efficient incorporation of large-mesoporous silica materials with the film structure to fabricate hybrid film materials has been promising for water treatment. The modified large-mesoporous silica films possessed superior adsorbability, but the poor mechanical behavior hampered the application of adsorbents. We proposed the fabrication of La modified rGO/silica mesoporous films for efficient phosphate removal to deal with this problem. Consider the problem of plugging of mesopores , La/Si molar ratio of 1/10 was a conventionally reported loading ratio in the literatures. In this paper, the film materials also retained pore size (19.97 nm) comparable with that of the pristine large-mesoporous silica films (20.53 nm) when the La/Si molar ratio was 1/5. In the adsorption experiments, the maximum phosphate capacities achieved 55.045 mg g −1 . And multi-adsorption mechanisms were confirmed by the results of analysis. The formation of rod-like crystal LaPO 4 was the main pathway in the adsorption process. The film material might create a new way for phosphate removal.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Yiyi Liu,Peiman Xu,Zhifeng Ye,Tianlun Cen,Xiaomin Peng,Dingsheng Yuan,Haiyan Wu
Transition metal oxides , as newly earth-abundant and low-cost catalysts, have been regarded as promising materials for electrocatalytic oxygen evolution. However, they are rarely used as an electrocatalyst in hydrogen evolution reaction (HER) due to the poor HER activity. Herein, we present a facile two-step method to synthesize P doped CoMoO 4 /RGO (P-CoMoO 4 /RGO) with different atomic ratios of Co 2+ /Co 3+ through a simple phosphorization strategy by changing the mass of NaH 2 PO 2 . The effective P-doping into CoMoO 4 /RGO can modify the electronic properties and modulate the atomic ratio of Co 2+ /Co 3+ , which promotes the electron transfer and creates more activity sites. Therefore, the optimized P-CoMoO 4 /RGO with a relatively larger atomic ratio of Co 2+ /Co 3+ shows superior HER performances in alkaline media , which affords a current density of 10 mA cm −2 at a small overpotential of 90 mV and a low Tafel slope of 62 mV dec −1 along with having satisfactory long-term stability. This work provides a valuable route to enhance the HER activity of transition metal oxides.
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NANOTECHNOLOGY
·
2021
·Vol. 32
·期 37
·375710
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IF 3.874
Yaoguo Shen,Lin Wu,Yingwu Zhou,Hong Lin,Cheng Zhang,Hualiang Yu,Jun Wang,Lei Yu
Two-dimensional (2D) materials have attracted extensive attention owing to their unique electronic/physiochemical properties, and wide application potential in energy storage and conversion. However, 2D materials are often tendency to aggregate due to the strong van der Waals interactions, leading to gradually decrease of an efficient mass transfer pathway and accessible surface area for the electrolyte. Here, we demonstrate an efficient approach for large-scale production of a hybrid nanostructures (Ti3C2Tx/rGO) based on ultrathin MXene nanosheets anchored on layered reduced graphene (rGO) supported by porous Ni-foam via a plain chemical dipping method followed by high temperature annealing process. Ti3C2Tx/rGO electrode exhibits a porous structure, excellent ionic and electrical conductivities, and remarkable specific capacitance. Furthermore, it shows ultra-high cycle stability, for example, 88.70% of its specific capacity can be maintained through 3000 cycles. This kind of porous nanostructure and integrated design idea is significant to design other energy storage modules.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Yingying Lai,Lizhang Lv,Heqing Fu
In this work, Al 2 O 3 @PPy@rGO composites were successfully synthesized by a “coating-coating” route. The structure of Al 2 O 3 @PPy@rGO composites was characterized by XRD , Raman and SEM. The coaxial wire method was used to measure the electromagnetic properties of Al 2 O 3 @PPy@rGO composites, which was carried on the vector network analyzer (VNA, 3672A/B/C-S) over the 2–18 GHz frequency range. Compared with Al 2 O 3 (about 50 nm), the particle size of Al 2 O 3 @PPy composites (about 70 nm) enhanced, which verified the alumina was coated by PPy . In addition, the Al 2 O 3 @PPy composites are tightly attached by the rGO with a diameter of about 30 nm Al 2 O 3 @PPy@rGO composites have excellent thermal stability, and they remain 53 wt% when the temperature is up to 800 °C. When the thickness of Al 2 O 3 @PPy@rGO composites is 3.0 mm, they reach the maximum reflection loss of −39.7 dB at 13.2 GHz with 15 wt% Al 2 O 3 @PPy@rGO-wax. And the broad effective microwave absorption bandwidth of Al 2 O 3 @PPy@rGO composites is 5.5 GHz in 10.5–16.0 GHz. In addition, the electromagnetic wave absorption mechanism of Al 2 O 3 @PPy@rGO composites was analyzed.
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NANOTECHNOLOGY
·
2020
·Vol. 31
·期 12
·125101
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IF 3.551
Jingchen Li,Jie Zheng,Yadong Yu,Zhen Su,Lihui Zhang,Xiaojun Chen
The abuse of antibiotics has led to the emergence of numerous super resistant bacteria, which pose a serious threat to public health. Developing nanomaterials with novel modes of bactericidal activity offers the promise of fighting pathogens without the risk of causing drug resistances. Here, we used reduced graphene oxide (rGO), bulk molybdenum disulfide (MoS2) and silver nitrate (AgNO3) to synthesize a ternary nanocomposite, rGO–MoS2–Ag, via a simple one-pot method. The resulting rGO–MoS2–Ag presented as crumpled and sheet-like structures decorated with Ag nanoparticles. The minimum inhibitory concentration and minimum bactericidal concentration of rGO–MoS2–Ag against Escherichia coli were 50 and 100 μg ml−1, while Staphylococcus aureus reacted only to twice higher concentrations of 100 and 200 μg ml−1, respectively. Notably, rGO–MoS2–Ag exhibited better antibacterial activity towards E. coli and S. aureus than rGO, MoS2, or rGO–MoS2. This result can be attributed to the excellent performance of rGO–MoS2–Ag in destroying the bacterial cell membrane and inducing the generation of reactive oxygen species. The Ag+ ion release of rGO–MoS2–Ag was delayed, endowing the nanocomposite with long-term antibacterial capabilities and better biosafety. Our results indicate that the as-prepared rGO–MoS2–Ag has promising potential for application in biomedicine and public health.
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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Jingjing Wu,Hongqiang Li,Xuejun Lai,Zhonghua Chen,Xingrong Zeng
Piezoresistive pressure sensors with high sensitivity, fast response, and simplified signal collection play an important role in a wide variety of fields. However, most of them are water-sensitive and easily attacked by water, leading to serious signal distortion in practical application. Herein, we fabricated a conductive and superhydrophobic 1H,1H,2H,2H-perfluorooctyltriethoxysilane (FAS) modified reduced graphene oxide@carbon nanotubes/chitosan (F-rGO@CNTs/CS) aerogel for piezoresistive pressure sensor. Benefiting from the porous structure of aerogel and the synergy of CNTs and rGO, the aerogel sensor achieved high sensitivity and fast response. Moreover, the sensor maintained a stable electrical resistance response after 1000 loading-unloading cycles. Importantly, owing to the rough structure constructed by CNTs and multi-pores and the low surface energy of FAS, the sensor possessed superhydrophobic property with a high water contact angle of 154°, and exhibited remarkable water repellency even during compression process. In addition, the sensor was successfully applied for detecting human behaviors from small-scale muscle movements to large-scale body motions. Our findings provide a new direction to fabricate functional and high-performance piezoresistive pressure sensor for various applications even under water or wet environment.
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ACS Applied Energy Materials
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2019
·
IF 0
Chuan-Shan Hu,Hui-Juan Li,Jia-Yun Wang,Abdul Haleem,Xi-Chuan Li,Muhammad Siddiq,Wei-Dong He
Lacking clean water has become a matter of urgency and harvesting solar energy for water evaporation is an efficient solution. Loading photothermal materials into porous and hydrophilic matrix prominently facilitates the water evaporation efficiency. In this work, cryopolymerization was adopted first to fabricate macroporous and hydrophilic matrix–cryogel of polyacrylamide (PAM) while reduced graphene oxide (rGO) was hybridized during the fabrication with thermal reduction of graphene oxide (GO). Inspired by the transpiration of natural mushroom, the solar-heating device was integrated with the stipe of PAM cryogel, which expedited the transport of water from the water reservoir to the pileus and the elimination of heating energy loss, and the pileus composed of rGO/PAM hybrid cryogel, which enabled the high efficiency of solar light absorption and solar-heating conversion. Such a mushroom-like device achieved rapid water vapor generation and high overall efficiency of solar-heating evaporation under one-sun illumination. As well, this mushroom-like device exhibited the identical practicability of solar-heating evaporation for the different water sources such as the wastewater containing salt, surfactant, or oil, compared with pure water. Within 10 cycles, those mushroom-like rGO/PAM hybrid cryogels retained the analogous solar-heating evaporation performance. The mushroom bioinspiration and cryopolymerization would afford a novel and convenient route for highly efficient solar-heating water evaporation.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 31
·期 1
·667-676
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IF 2.195
Zhang Qi,Liu Miao,Liu Shujie,Qiao Liang,Hu Xiaoying,Tian Hongwei
BiVO 4 is known for its ability to decompose water under visible light irradiation. However, BiVO 4 overall suffers from rapid recombination of photogenerated carriers, low photochemical conversion efficiency, low specific surface area, poor conductivity, and weak adsorption capacity of dye. These features limited its application in photocatalysis. In this work, ternary Z-scheme g-C 3 N 4 /RGO/BiVO 4 nanocomposites were successfully fabricated by in situ electrostatic adsorption of g-C 3 N 4 sheets on RGO/BiVO 4 surface using hydrothermal and thermal oxidations processes. The ternary Z-scheme g-C 3 N 4 /RGO/BiVO 4 nanocomposites were then tested for photodegradation of Rhodamine B. The introduction of graphene into direct Z-scheme g-C 3 N 4 /BiVO 4 nanocomposites as an electronic accelerator efficiently enhanced the photocatalytic properties. The as-prepared g-C 3 N 4 /RGO/BiVO 4 composites exhibited optimal visible light responses with significantly improved photocatalytic performances toward degradation of Rhodamine B. The degradation efficiency using ternary photocatalyst reached 100% after 20 min of irradiation time. The reaction rate constant was estimated to 1.537, which was almost 29- and 20-folds higher than those of pure g-C 3 N 4 and binary g-C 3 N 4 /BiVO 4 , respectively. The synergistic effect between BiVO 4 , RGO and g-C 3 N 4 yielded g-C 3 N 4 /RGO/BiVO 4 composites with Z-scheme charge transfer mechanism, promoting rapid separation and slow recombination of photogenerated electron–hole pairs with strong photocatalytic activity. Overall, these findings look promising for design of future Z-scheme photocatalysts for environmental degradation of organic dyes.
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CERAMICS INTERNATIONAL
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2018
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IF 3.057
Bin Xiao,Bao Zhang,Lin-bo Tang,Chang-sheng An,Zhen-jiang He,Hui Tong,Wan-jing Yu,Jun-chao Zheng
V 2 O 3 is a promising anode material and has attracted the interests of researchers because of its high theoretical capacity of 1070 mAh g −1 , low discharge potential, inexpensiveness, abundant sources, and environmental friendliness. However, the development and application of V 2 O 3 have been hindered by the low conductivity and drastic volume change of V 2 O 3 composites. In this work, V 2 O 3 /reduced graphene oxide (rGO) nanocomposites are successfully prepared through a facile solvothermal method and annealing process. In this synthesis protocol, V 2 O 3 nanoparticles (NPs) are encapsulated by rGO. This unique structure enables rGO to inhibit volume changes and improve the ion and electronic conductivity of V 2 O 3 . In addition, V 2 O 3 NPs, which exhibit sizes of 5–40 nm, are uniformly dispersed on rGO sheets without aggregation. The Li + storage behavior of V 2 O 3 /rGO is systematically investigated in the potential range 0.01–3.0 V. The V 2 O 3 /rGO nanocomposite can achieve a high reversible specific capacity of 823.4 mAh g −1 under the current density of 0.1 A g −1 , and 407.3 mAh g −1 under the high current density of 4.0 A g −1 . The results of this study provide insight into the fabrication of rGO-based functional materials with extensive applications.
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Nano-Micro Letters
·
2019
·Vol. 11
·期 1
·1-15
·
IF 9.043
Zhang Deqing,Liu Tingting,Cheng Junye,Cao Qi,Zheng Guangping,Liang Shuang,Wang Hao,Cao Mao-Sheng
Two-dimensional (2D) nanomaterials are categorized as a new class of microwave absorption (MA) materials owing to their high specific surface area and peculiar electronic properties. In this study, 2D WS 2 –reduced graphene oxide (WS 2 –rGO) heterostructure nanosheets were synthesized via a facile hydrothermal process; moreover, their dielectric and MA properties were reported for the first time. Remarkably, the maximum reflection loss (RL) of the sample–wax composites containing 40 wt% WS 2 –rGO was − 41.5 dB at a thickness of 2.7 mm; furthermore, the bandwidth where RL < − 10 dB can reach up to 13.62 GHz (4.38–18 GHz). Synergistic mechanisms derived from the interfacial dielectric coupling and multiple-interface scattering after hybridization of WS 2 with rGO were discussed to explain the drastically enhanced microwave absorption performance. The results indicate these lightweight WS 2 –rGO nanosheets to be potential materials for practical electromagnetic wave-absorbing applications.
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