JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2014
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IF 3.679
Jian Yu,Wan-Feng Lin,Le-Hui Leng,Shao-Kui Bao,Jian-Ping Zou,Xu-Biao Luo,De-Zhi Chen,Sheng-Lian Luo,Chak-Tong Au
Novel heterostructured TiO 2 /Co 4 S 4.23 Se 3.77 composites were synthesized by a combination of solid-state and sol–gel methods, and were characterized by single-crystal X-ray diffraction, powder X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, UV–vis diffuse reflectance spectroscopy, and photocurrent measurements. The results of photocatalytic degradation of methylene blue over the as-prepared materials indicate that photocatalytic efficiency is closely related to the composition of the materials, and the 30%TiO 2 /Co 4 S 4.23 Se 3.77 catalyst exhibits the best adsorption and photodegradation efficiency under sunlight or visible-light irradiation. The adsorption capacity of 30%TiO 2 /Co 4 S 4.23 Se 3.77 for methylene blue is 18.59 mg/g calculated based on the Langmuir adsorption model. Adsorption kinetics studies show that the process fits well with a pseudo-second-order rate mechanism. Recycle experiments confirm that the 30%TiO 2 /Co 4 S 4.23 Se 3.77 catalyst is stable. The present work illustrates a new way for the design and syntheses of stable and high-efficiency catalysts applicable for the degradation of organic pollutants.
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SUPERLATTICES AND MICROSTRUCTURES
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2017
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IF 2.123
Qiqian Gao,Lianfeng Duan,Xueyu Zhang,Itaru Kamiya,Wei Lü
In the present work, {001}-faceted TiO 2 nanosheets were prepared via a one-step hydrothermal method and used as backbone scaffold of photoanodes of solar cells. The graphitic carbon nitride (g-C 3 N 4 ) was obtained by simple solid-state heat treatment and applied to modify the {001}-faceted TiO 2 nanosheet photoanodes. Compared with the photoanodes prepared from pure {001}-faceted TiO 2 nanosheets, the power conversion efficiency (PCE) of g-C 3 N 4 modified {001}-faceted TiO 2 nanosheet photoanodes was enhanced due to the suitable band-alignment between g-C 3 N 4 and TiO 2 . With 20% loading of g-C 3 N 4 in the photoanode, a maximum PCE of 4.23% with an open circuit voltage of 0.58 V, a short circuit current density of 15.5 mA/cm 2 , and a fill factor (FF) of 0.48 was achieved, giving 24.7% enhancement in the cell efficiency. Various characterizations were performed to understand the role of g-C 3 N 4 on the device performance, and the mechanisms that account for the improvement are suggested.
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Journal of Materials Chemistry A
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2017
·Vol. 5
·期 26
·13591-13600
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IF 8.867
Yongchao Tang,Zongbin Zhao,Xiaojuan Hao,Yuwei Wang,Yang Liu,Yanan Hou,Qi Yang,Xuzhen Wang,Jieshan Qiu
Nanostructured CoSe2 anode materials hold great promise for sodium ion batteries (SIBs), drawing much recent research attention. However, high-performance CoSe2 based anodes are still challenging to obtain. Herein, using zeolitic imidazolate framework-67 (ZIF-67) particles as the starting material, nondestructive hollow polyhedral hybrids have been synthesized successfully, which are structured from CNT-bridged carbon-coated CoSe2 nanospheres (CoSe2@C/CNTs). During the synthesis, the controlled in situ growth of CNTs introduces additional mesopores and open channels to the hybrids, and avoids serious agglomeration of the CoSe2 nanospheres. When employed as anode materials for SIBs with ether-based electrolyte, the CoSe2@C/CNTs show overwhelming merits over graphitic carbon-coated CoSe2 nanosphere polyhedral hybrids (CoSe2@GC) and bare CoSe2 particles. Specifically, the CoSe2@C/CNTs anode displays a high reversible capacity (∼470 mA h g−1 at 0.2 A g−1), a good rate capability of ∼373 mA h g−1 even at 10 A g−1, and an excellent cycling stability of over 1000 cycles with a capacity retention of ∼100% calculated from the 70th cycle. In addition, the electrochemical reaction dynamics analysis indicates a considerable capacitive contribution during the discharge–charge cycles, which is beneficial to enhance the rate capability and cyclability of the CoSe2@C/CNTs anode. Such results could be ascribed to the stable ether-based electrolyte-active material intermediates, improved electrolyte-active material contact, and shortened charge transfer paths afforded by the unique hybrid nanostructure.
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Journal of Materials Chemistry C
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2017
·Vol. 5
·期 12
·3035-3041
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IF 5.256
Kaisi Liu,Bin Yao,Yongfeng Li,Zhanhui Ding,Hao Sun,Yuhong Jiang,Gang Wang,Daocheng Pan
Herein, we successfully prepared dithiocarbamate-based Cu2ZnSnS4 (CZTS) precursor solutions using various amino groups such as methylamine, ethylamine, propylamine, butylamine, amylamine, hexylamine, octylamine, and ethanolamine. These solutions exhibited a distinguishing wetting behavior, viscosity, and stability and could be used to fabricate CZTS thin films by a simple spin-coating and annealing process. We compared the thermogravimetric analysis of the precursor solutions and the XRD patterns of the as-prepared CZTS films and clear differences between the samples were observed. Furthermore, we fabricated high-quality CZTS films using the ethanoldithiocarbamate-based CZTS precursor solution, and the Cu2ZnSn(S,Se)4 solar cell with the best power conversion efficiency (7.66%) under 1.5 AM illumination was achieved.
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JOURNAL OF CRYSTAL GROWTH
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2015
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IF 1.698
Huacheng Cai,Wendong Wang,Peiwen Liu,Guangming Wang,Ankang Liu,Zhe He,Zhaofang Cheng,Shengli Zhang,Minggang Xia
We demonstrate tin (Sn) nanowires growth enhanced by Selenium (Se) atoms via physical vapor transport (PVT) method. The Raman spectroscopy, X-ray diffraction, scanning electron microscopy and high-resolution transmission electron microscopy show that Sn nanowires are synthesized with a large quantity, good quality and high purity of Sn. The growth of Sn nanowires is attributed to Solid–Vapor–Liquid mechanism. The effects of gold nanoparticles catalyst, Si substrate, and Se atoms on Sn nanowires growth are discussed in detail. We find that Se atom plays a key role in the growth of Sn nanowires. The gaseous Sn atoms are absorbed by the eutectic alloy droplets of Se–Au at first. Then Sn atoms precipitate at the liquid–solid phase interface due to a supersaturated solution and form a one-dimensional nanostructure. In all, this PVT method could provide a simple and quick way to synthesize monocrystalline Sn nanowires with an advantage in both quality and quantity. The optical transmittance of Sn nanowires thin film with 2 μm 2 density approaches 85–90% in visible wavelength. Therefore, the Sn nanowires thin film can be applied to transparent electrode along with their metallic property.
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APPLIED SURFACE SCIENCE
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2015
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IF 2.711
Chao Gong,Miaoliang Huang,Pei Zhou,Zhixian Sun,Leqing Fan,Jianming Lin,Jihuai Wu
Mesoporous Co 0.85 Se nanosheets on Ni foam for high-performance supercapacitors were prepared by a facile one-step hydrothermal method. The as-synthesized Co 0.85 Se electrodes possess high pseudocapacitive performance with large specific capacitance and excellent cycling stability. The specific capacitance can achieve a maximum of 1378 F g −1 at a current density of 1 A g −1 , which can still keep 95.5% of capacitance retention after 1000 cycles. Then, an asymmetric supercapacitor was fabricated by using Co 0.85 Se nanosheets as positive material and activated carbon (AC) as negative material. The asymmetric configuration can extend voltage window to 1.6 V, which lead to a significant increase in the energy density to 39.7 W h kg −1 at a power density of 789.6 W kg −1 , couples with outstanding cycle stability. The results demonstrate that the mesoporous Co 0.85 Se nanosheets are promising electrode materials for supercapacitors.
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APPLIED SURFACE SCIENCE
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2015
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IF 2.711
Wenchao Wang,Fang Li,Dieqing Zhang,Dennis Y.C. Leung,Guisheng Li
CdSe nanoparticles enhanced TiO 2 nanotube arrays electrodes (CdSe/TNTAs) were explored as the photoanode for driving the photoelectrocatalytic (PEC) generation of hydrogen and simultaneous degradation of organic pollutants in a PEC system. The evolution hydrogen and the simultaneous degradation of organic pollutants were performed in an electrolytic cell (three electrodes system) under visible-light ( λ > 400 nm). Such CdSe/TiO 2 based PEC system exhibited both high efficiency of hydrogen generation and effective oxidation of methyl orange (MO). Such high PEC performance of CdSe/TNTAs was attributed to the high dispersity of CdSe nanoparticles on both outside and inside of the pore walls of TiO 2 nanotube arrays, the strong combination and heterojunctions between CdSe and TiO 2 through Cd O bonds via electrodeposition with ion-exchange method.
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RSC Advances
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2014
·Vol. 5
·期 6
·4184-4190
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IF 3.708
Qingwen Tian,Yong Cui,Gang Wang,Daocheng Pan
The metal chalcogenides are excellent choices as absorbers and buffer-layers in thin film solar cells. Versatile chemical approaches provide endless possibilities to prepare metal sulfide precursor solutions. Recently, Cu2ZnSnS(Se)4 thin films have played an important role in fabricating low-cost and high-efficiency solar cells. Here, we present a robust and low-cost 1,2-ethanedithiol/ethanolamine/2-methoxyethanol ternary solution process to prepare Cu2ZnSnS4 precursor solution and high-quality Cu2ZnSnS4 thin films. Low-cost Cu2O, ZnO and SnO are used as the raw materials, which can be easily dissolved in the 2-methoxyethanol solution of 1,2-ethanedithiol and ethanolamine at room temperature in air. By tuning the composition of the Cu2ZnSn(S,Se)4 thin film with a selenization process, an active-area power conversion efficiency of 7.34% has been achieved for Cu2ZnSn(S,Se)4 solar cell.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2017
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IF 3.133
Hongchao Li,Jianpeng Zou,Senlin Xie,Xian Leng,Di Gao,Hongzhi Yang,Xu Mao
Inexpensive graphite substrate is applied to grow WSe 2 nanofilms for catalytic application in the hydrogen evolution reaction . W nanofilms with a thickness of about 10 nm were deposited onto the graphite substrate by direct-current magnetron sputtering . The graphite with 10 nm W nanofilms was rapidly selenized at 600 °C in horizontal tube furnace to form WSe 2 nanofilms. Scanning electron microscopy, Raman spectroscopy , high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy indicated that graphite surface was covered by nano-sized vertically aligned WSe 2 platelets. The effects of the N 2 pressure in the selenization process on the HER performance have been studied in details. Turning of the selenization parameters can optimize the HER performance of the WSe 2 nanofilms, which has been evaluated via linear sweep voltammetry and Tafel slope. WSe 2 nanofilms prepared at the highest N 2 pressure of 0.08 MPa behave optimal performance. The current density reaches 10 mA cm −2 at an over potential around −189 mV vs reversible hydrogen electrode and corresponding Tafel slopes is ∼72 mV dec −1 . WSe 2 nanofilms electrodes exhibit high stability in acidic solution which shows no degradation after 10000 continuous cycles. Thus, WSe 2 nanofilms exhibit superior electrocatalytic performance which is much better than those recently reported grown on carbon paper substrate and W foil.
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Materials Today Chemistry
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2017
·
IF 0
Yan Zhang,Ying Xu,Chao Wei,Yuanying Zhang,Liu Yang,Zhongchen Song,Meidong Lang
Herein, novel multi-responsive injectable polyester hydrogels were reported based on the diselenide-containing poly(ε-caprolactone) copolymers ((mPEG-PCL-Se) 2 ). The (mPEG-PCL-Se) 2 solution remained a free-flowing state at ambient temperature but spontaneously turned into a semisolid hydrogel upon heating to physiologic temperature. The phase transition temperature was examined to be dependent on the composition and aqueous concentration of the copolymers. More importantly, the thermo-responsive hydrogels were endowed with oxidation and reduction-triggered degradation by the incorporation of diselenide groups. Accordingly, the degradation of poly(ε-caprolactone)-based hydrogels was greatly improved and the rate of degradation was well regulated by the concentration of hydrogen peroxide (H 2 O 2 ) or glutathione (GSH). This superior stimuli-responsive degradation could lead to an enhanced drug release of encapsulated drug (Doxorubicin, DOX). Thus the oxidation and reduction-triggered degradable diselenide-containing poly(ε-caprolactone) hydrogels would offer great potential for the controlled drug delivery.
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JOURNAL OF POWER SOURCES
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2017
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IF 6.395
Xiaojun He,Hao Ma,Jingxian Wang,Yuanyang Xie,Nan Xiao,Jieshan Qiu
A hydroxide-template strategy coupled with in-situ chemical activation is reported for the first time to fabricate porous carbon nanosheets (PCNSs) from coal tar. The thin PCNSs feature abundant short pores accessible for fast ion transport and high specific surface area up to 3235 m 2 g −1 for ion adsorption. As electrodes for supercapacitors , the PCNSs show a high capacitance of 296.2 F g −1 at 0.05 A g −1 in 6 M KOH electrolyte, an excellent rate performance with a capacitance of 220.7 F g −1 at 20 A g −1 and a superior cycle stability with over 97.2% capacitance retention after 11000 charge-discharge cycles at 3.5 A g −1 . This work paves a new way for efficient fabrication of sheet-like carbon materials with tuned porous structure from polycyclic aromatic hydrocarbons for high performance supercapacitors .
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Zhongjie Cui,Shuaitao Qin,Haiyang He,Jinchan Zhao,Rui Jiang,Yifeng Xing,Shiliang Mei,Wanlu Zhang,Ruiqian Guo
As one of the promising next-generation light conversion materials, indium phosphide quantum dots (InP QDs) deserve much attention due to their great optical performances and environmentally friendly properties in particular. Herein, InP-based QDs are embedded into mesoporous SBA-15 and solid QDs/SBA-15 composites are prepared, which exhibit 1.5 times higher photoluminescence quantum yield (PLQY) and narrower full width of half maximum (FWHM) than traditional QDs powder thanks to the reduction of light reabsorption and the optical waveguide effect of mesoporous structure. These advantages contribute to the performance enhancement of light-emitting diodes (LEDs). The luminous efficacy of the LED with green QDs/SBA-15 is 99.49 lm/W, which is higher than that of QDs powder (66.14 lm/W). In addition, the white LED fabricated with green and red InP-based QDs/SBA-15 shows luminous efficacy of 61.38 lm/W. More importantly, the luminous efficacy of the white LED is improved to 129.62 lm/W when using the K 2 SiF 6 :Mn 4+ instead of red InP-based QDs/SBA-15, because the K 2 SiF 6 :Mn 4+ does not absorb the emission from green InP-based QDs/SBA-15. This value is higher than those white LEDs with InP-based QDs reported previously. It is believed that this study demonstrates the promising potential of InP-based QDs for optoelectronic applications.
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