MICROCHEMICAL JOURNAL
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2018
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IF 2.746
Pingyang Cai,Hongjie Song,Yi Lv
In the present work, three different kinds of In 2 S 3 : hierarchical microspheres A, B and C (HMa, HMb and HMc), which were synthesized by a hydrothermal method in the sodium dodecyl sulfate-thiourea (SDS-thiourea) system. XRD, SEM and BET were used to characterize the prepared In 2 S 3 materials. Compared with the other two kinds of In 2 S 3 , the as-prepared In 2 S 3 hierarchical microspheres B (In 2 S 3 HMb) exhibit the best cataluminescence response to ammonium sulfide. The response and recovery times of the home-made ammonium sulfide gas sensor with In 2 S 3 hierarchical microspheres B as sensing materials were about 8 s and 24 s, respectively. The linear dependence of the sensitivity on the ammonium sulfide concentration was observed in the range of 4–200 ppm with an excellent selectivity. These results indicated that In 2 S 3 hierarchical microspheres B would be a good candidate for fabricating practical cataluminescence ammonium sulfide sensor.
研究领域:
材料科学
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化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2015
·Vol. 41
·期 10
·14501-14507
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IF 2.605
Yibing Lin,Yu Lin,Jihuai Wu,Yongguang Tu,Xiaolong Zhang,Biaopeng Fang
In this study, the different sizes of ZnO hierarchical spheres (ZnO HS) based on the aggregations of nanoparticles were synthesized through hydrolysis of zinc acetate dihydrate in water and applied to photoanodes of quantum dots-sensitized solar cells (QDSSCs). Among these, ZnO HS with a main diameter of less than 1 μm could significantly extend the traveling distance of light within the photoanode films as the scattering centers and ZnO nanoparticles could prevent the decrease of specific surface area. CdS and CdSe quantum dots were deposited by successive ionic layer absorption and reaction (SILAR) method and chemical bath deposition (CBD) respectively. Field-emission scanning electron microscopy (FE-SEM), Transmission electron microscope (TEM) and X-ray diffraction (XRD) were used to identify the surface profile and crystal structure of ZnO HS photo-electrodes before and after depositing quantum dots . CdS/CdSe co-sensitized ZnO HS photoanodes demonstrated an overall power conversion efficiency of 4.13% under one sun illumination (100 mW cm −2 ), which is higher than that of CdS/CdSe co-sensitized ZnO nanoparticles (ZnO NP) photoanodes.
研究领域:
材料科学
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光伏技术
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纳米技术
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DOI
高影响因子
ENERGY & FUELS
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2021
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IF 3.605
Longchao Wang,Dingding Kong,Fengshang Chen,Lisan Cui,Yezheng Cai,Hongqiang Wang,Xinxian Zhong,Youguo Huang,Qingyu Li,Zhaoling Ma,Sijiang Hu
Manganese dioxide (MnO2) represents a promising oxygen reduction reaction (ORR) electrocatalyst, but its catalytic activity is largely limited by the essentially low electronic conductivity and large geometric size. Herein, hierarchical ε-MnO2 nanosheets (MnO2-H) strongly coupled with silver nanoparticle spheres (Ag NPs) were developed. The introduced Ag NPs can not only enhance the electronic transfer but also tune the electronic structure of MnO2 and act as active sites for ORR. Owing to the large electrochemically active surface area, good mass/electronic transfer, and a strong coupled interface between MnO2-H and Ag NPs, the optimal Ag-MnO2-H-1.53 showed much higher catalytic activity than MnO2-H, Ag microparticles, and commercial Pt/C catalyst for ORR. Moreover, Ag-MnO2-H-1.53 displayed robust catalytic stability with negligible shift in the half-wave potential after 5000 cycles. As a cathode catalyst, a homemade zinc–air battery (ZAB) based on Ag-MnO2-H-1.53 showed a high open circuit voltage (1.52 V), maximum peak power density (120.2 mW/cm2), and specific capacity (646 mAh/g) superior to those of Pt/C-based ZAB (1.48 V, 82.3 mW/cm2, and 612 mAh/g), along with a long lifetime. This work highlights the significance of strong interface coupling between MnO2-H and Ag NPs for boosting the ORR electrocatalysis, which will inspire more work for the rational design of efficient carbon-free transition metal electrocatalysts for energy conversion.
研究领域:
材料科学
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电化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2018
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IF 3.609
Yujie Zheng,Bingjie Liu,Pei Cao,Hui Huang,Jing Zhang,Guowei Zhou
In this study, flower-like mesoporous TiO 2 hierarchical spheres (FMTHSs) with ordered stratified structure and TiO 2 nanoparticles (TNPs) were synthesized via a facile solvothermal route and an etching reaction. Multilamellar vesicles (MTSVs) and unilamellar TiO 2 /SiO 2 vesicles (UTSVs) were prepared using cetyltrimethylammonium bromide and didodecyldimethylammonium bromide as structure-directing agents under different solvothermal conditions. FMTHSs and TNPs were obtained from the etching reactions of MTSVs and UTSVs, respectively, in an alkaline system. FMTHSs display flower-like, ordered stratified structures on each petal. The thickness of the ordered stratified structure is approximately 3–6 nm, and the number of layers is approximately 2–4. The FMTHSs2 electrode exhibits the first discharge capacity of 212.4 mA h g −1 at 0.2 C, which is higher than that of TNPs electrode (167.6 mA h g −1 ). The discharge specific capacity of FMTHSs2 electrode after 200 cycles at 1 C is 105.9 mA h g −1 , which is higher than that of TNPs electrode (52.2 mA h g −1 ) after the same number of cycles. The outstanding performance of FMTHSs2 electrode is attributed to the advantages of FMTHSs. In particular, their own stratified structure can provide additional active sites for reactions. The hierarchical structure can provide short diffusion length for Li + , large electrolyte–electrode contact area, and superior accommodation of the strain of Li + intercalation/deintercalation.
研究领域:
材料科学
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能源存储与转换
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 27
·期 7
·6656-6664
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IF 1.798
Lin Yibing,Lin Yu,Wu Jihuai,Zhang Xiaolong,Fang Biaopeng
In this study, after CdS quantum dots sensitized ZnO hierarchical spheres (ZnO HS), we used a simple process to deposit CdSe QDs on ZnO by spin-coating-based SILAR, and applied to photoanodes of quantum dots-sensitized solar cells. Before CdS and CdSe QDs deposition, the ZnO HS photoanodes were modified by Zn(CH 3 COO) 2 ·2H 2 O methanol solution to further enhance the open-circuit voltage and power conversion efficiency (PCE). The program of modifying photoanodes and the number of CdSe spin-SILAR cycles are evaluated on the optical and electrochemical properties of the cells. As a result, a high energy conversion efficiency of 2.49 % was obtained by using modified ZnO HS/CdS photoanode under AM 1.5 illumination of 100 mW cm −2 . And further decorated by the CdSe QDs, the ZnO HS/CdS/CdSe cell achieved a PCE of 5.36 % due to the modification of ZnO HS nanostructure, the enhanced absorption in the visible region, the lower recombination reaction and higher electron lifetime.
研究领域:
材料科学
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纳米技术
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能源科学
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产品关联
DOI
高影响因子
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