JOURNAL OF POWER SOURCES
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2018
·
IF 6.945
Zhitong Jin,Meirong Zhang,Min Wang,Chuanqi Feng,Zhong-Sheng Wang
In quasi-solid-state dye-sensitized solar cells (QSDSSCs), electron transport through a random network of catalyst in the counter electrode (CE) and electrolyte diffusion therein are limited by the grain boundaries of catalyst particles , thus diminishing the electrocatalytic performance of CE and the corresponding photovoltaic performance of QSDSSCs. We demonstrate herein an ordered Co 0.85 Se hollow nanorods array film as the Pt-free CE of QSDSSCs. The Co 0.85 Se hollow nanorods array displays excellent electrocatalytic activity for the reduction of I 3 − in the quasi-solid-state electrolyte with extremely low charge transfer resistance at the CE/electrolyte interface, and the diffusion of redox species within the Co 0.85 Se hollow nanorods array CE is pretty fast. The QSDSSC device with the Co 0.85 Se hollow nanorods array CE produces much higher photovoltaic conversion efficiency (8.35%) than that (4.94%) with the Co 0.85 Se randomly packed nanorods CE, against the control device with the Pt CE (7.75%). Moreover, the QSDSSC device based on the Co 0.85 Se hollow nanorods array CE presents good long-term stability with only 4% drop of power conversion efficiency after 1086 h one-sun soaking.
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RSC Advances
·
2018
·Vol. 8
·期 51
·29220-29227
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IF 2.936
Bo Tang,Haogang Yu,Haoping Peng,Zhengwei Wang,Sen Li,Tingting Ma,Weiqiu Huang
Graphene assisted photoanodes are promising because of the high performance of the resulting dye sensitized solar cells (DSSCs). A photoanode with a three-layer structure is prepared in this study and the synergy between each layer was found to play a vital role in its photovoltaic properties. The influence of interface contact between the transport layer and work layer is revealed. After ameliorating the interface contact level (enhancing the electron transport ability), the functions of the adopted reduced graphene oxide (RGO) and three-dimensional graphene networks (3DGNs) in the transport layer and work layer, respectively, can be made full use of. In order to further enhance the scattering ability for the incident light and improve the adsorption ability for dye molecules, a scattering layer based on the RGO–TiO2 is added in the photoanode. After a comprehensive optimization (including the types of functional groups and mass fractions of the RGO in the work layer and scattering layer), the resulting power conversion efficiency reaches 11.8%, which is much higher than that of previous reported graphene modified DSSCs.
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高影响因子
Materials Research Express
·
2018
·Vol. 5
·期 9
·095310
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IF 1.151
Kelong Chen,Tong Zhang,Yan Shi,Zhiyong Wang
The reversible complexation mediated polymerization (RCMP) of methyl methacrylate catalyzed by tetrabutylammonium iodide (BNI) was performed in toluene with an alkyl iodide initiator in situ formed. The influence of BNI amount, polymerization temperature, solvent, and initiator on the polymerization was studied. Results showed that the more organic catalyst, higher reaction temperature, highly polar solvent, and higher activity initiator led to shorter inhibition period and faster polymerization. More importantly, the mechanism for the shorter inhibition period and faster polymerization with BNI was proposed:
Poly(methyl methacrylate) with predetermined molar mass and relatively low Mw/Mn (determined by size exclusion chromatography, SEC) was successfully synthesized. Furthermore, the structure of resulting polymers was characterized using 1H NMR The living/controlled feature of the polymers was further demonstrated by the chain extension experiment. Attractive features of this procedure include commercially available catalyst, ease of operation, and efficiency.
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RSC Advances
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2019
·Vol. 9
·期 38
·21777-21785
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IF 3.049
Yafeng Deng,Zhanhong Ma,Fengzhang Ren,Guangxin Wang
An innovative two-step method perfectly prepared TCLs with different thicknesses, and then the TNA films based on TCLs were successfully prepared. The effects of different thicknesses of TCLs on the morphology and photoelectrochemical performance of TNA films were investigated. The results indicated that TCLs with appropriate thickness could effectively improve the morphology and photoelectrochemical performance of TNA films. Compared with the TNA films based on TCL5, TCL10 and TCL30, the TNA film based on TCL20 exhibited more ideal and comprehensive photoelectrochemical performance. Moreover, dye-sensitized solar cells (DSSCs) based on this TNA film achieved the highest Jsc (10.2054 mA cm−2), Voc (0.5737 V), PCE (3.3%) and Pout (3.31 mW cm−2).
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Soft Matter
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2019
·Vol. 15
·期 31
·6411-6417
·
IF 3.399
Xun Tong,Yuan Qiu,Xiaoyu Zhao,Bijin Xiong,Rongzhen Liao,Haiyan Peng,Yonggui Liao,Xiaolin Xie
Photoresponsive supramolecular gels have aroused continuous attention because of their extensive applications; however, most studies utilize UV light, which inevitably brings about some health and environmental issues. The halogen bond is an important driving force for constructing supramolecules due to its high directionality, tunable strength, good hydrophobicity, and large size of the halogen atoms. Yet, it still remains a formidable challenge to utilize halogen bonds as a driving force to fabricate a visible light responsive gel. In this work, to fabricate such a gel, azopyridine-containing Azopy-Cn (n = 8, 10, 12) was selected as a halogen bond acceptor, while 1,2-bis(2,3,5,6-tetrafluoro-4-iodophenyl)diazene (BTFIPD) was chosen as both the halogen bond donor and visible light responsive moiety. The visible light response of BTFIPD resulted from the significant separation of n–π* energy levels between trans and cis isomers due to the introduction of an electron-withdrawing group (fluorine) to azobenzene at the ortho-position. Interestingly, the gel exhibited a good gel-to-sol transition behavior upon green light irradiation. At the same time, the morphologies varied from uniform narrow flakes to broad sheets with increasing illumination time. We provide an environmentally-friendly visible light-triggered method to regulate the phase transition of supramolecular materials in applications ranging from energy conversion to information storage.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2017
·Vol. 22
·期 4
·1185-1195
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IF 2.316
Xie Xueyao,Yin Xin,Zhai Jifeng,Song Lixin,Du Pingfan,Li Ni,Xiong Jie
The flexible TiC/carbon nanofiber (TiC/C NF) film was prepared by electrospinning, stabilization, and carbonization. All the obtained TiC/CNFs had rough surface and random orientation, and the TiC nanoparticles (NPs) were uniformly dispersed on the CNFs. With the increase of TiC NPs, the flexural property of TiC/CNF film increased. While, the electrical conductivity increased, reaching a largest value before decreasing as the amount of TiC NPs increases. These highly flexible films showed promising electrical conductivity and electrocatalytic activity. Hence, they were employed as counter electrodes (CEs) for flexible dye-sensitized solar cells (FDSSCs). After the optimization of the amount of TiC NPs in CNFs (when the Tip content in precursor was 12 wt%), a high conversion efficiency of 3.80% was obtained. This is due to its optimum electrical conductivity and catalytic active sites. Based on the optimum amount of TiC NPs, the mesopores TiC/CNF composite films were fabricated by the introduction of various amount of polymethyl methacrylate (PMMA) in an electrospun solution. With the ratio of PMMA/(PAN/PVP) increasing, the specific surface area and the electrical conductivity increased, reached the largest values corresponding to 1:1, and then decreased. The increased surface area and conductivity facilitated the diffusion of electrolyte and reduction of triiodide, resulting in the improvement of the properties of CEs. When the FDSSCs were assembled with mesoporous TiC/CNF films as CEs, the conversion efficiency can be further enhanced up to 4.47%, which can be even comparable to the Pt/FTO CE.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Yuanyuan Meng,Yue Zhang,Weiyin Sun,Min Wang,Benlin He,Haiyan Chen,Qunwei Tang
A great challenge for state-of-the-art photovoltaic devices is to realize electric power generation in all weathers. We constructively demonstrate here the conversion from biomass to carbon quantum dots for all-weather carbon quantum dot solar cells that can generate electricity in the daytime and in the dark. The combination of green-emitting long persistence phosphors with mesoscopic titanium dioxide realizes optical storage by composite photoanode under illumination and excitation to monochromatic green light in the dark. The optimized all-weather solar cell yields maximized dark power conversion efficiency as high as 7.97% along with persistent electricity output for several hours. This work begins a photovoltaic revolution to forward all-weather solar cells as future energy solutions.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Guiyun Deng,Feifan Lu,Shuojun Li,Yuying Long,Jianghong Wu,Xiaofeng Guo,Chunyin Li,Zhiyong Song,Mohamed F. Foda,Fang Ding,Heyou Han
Citrus Huanglongbing (HLB) poses an enormous challenge to Citrus cultivation worldwide, necessitating groundbreaking interventions beyond conventional pharmaceutical methods. In this study, we propose molybdenum disulfide-chitosan nanoparticles (MoS 2 -CS NPs) through electrostatic adsorption, preserving the plant-beneficial properties of molybdenum disulfide (MoS 2 ), while enhancing its antibacterial effectiveness through chitosan modification. MoS 2 -CS NPs exhibited significant antibacterial efficacy against RM1021 , and the closest relatives to Candidatus Liberibacter asiaticus ( C Las), Erwinia carotovora , and Xanthomonas citri achieved survival rates of 7.40 % ± 1.74 %, 8.94 % ± 1.40 %, and 6.41 % ± 0.56 %, respectively. In vivo results showed, C Las survival rate of 10.42 % ± 3.51 %. Furthermore, treatment with MoS 2 -CS NPs resulted in an increase in chlorophyll and carotenoid content. Concomitantly, a significant reduction in malondialdehyde (MDA), soluble sugar, hydrogen peroxide (H 2 O 2 ), and starch contents was also observed. Mechanistically, MoS 2 -CS NPs enhanced the activity of antioxidant-related enzymes by upregulating the expression of antioxidant genes, thereby galvanizing the antioxidant system to alleviate oxidative stress. Collectively, this dual functionality—combining direct antibacterial action with the activation of plant defense mechanisms—marks a promising strategy for managing Citrus Huanglongbing and suggests potential agricultural applications for MoS 2 -based antibacterial treatments.
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FOOD HYDROCOLLOIDS
·
2024
·
IF 11
Sheng Ke,Anqi Wang,Min Zhuang,Xuanyu Wang,Zhongkai Zhou
The interaction between acetylated starch (AS) and soy protein isolates (SPI) was investigated under different pH conditions, and their corresponding physicochemical properties of the complexes were investigated. This study found that, at pH9.0, the β-turn structure of the protein in the complexes changed into Random coil with the highest ratio, and the thermal stability of the complexes was found to be reduced, which was contributed to the destruction of the crystalline region to a large extent. Meanwhile, the confocal laser scanning microscopy (CLSM) results showed that the complexes demonstrated a dispersed phase at pH5.0, and the SPI structure unfolded maximum at pH9.0. Following the determination of the changes in the rheological property under the existence of NaCl and urea, it was proposed that electrostatic interaction was the major interaction force for all the three complexes. However, hydrophobic and hydrogen bonding forces also seemed to play a more important role for AS/SPI-pH9 complexes than either AS/SPI-pH2 or AS/SPI-pH5 complexes. Complexation significantly increased encapsulation efficiency and loading capacity of curcumin compared to their corresponding individual polymer, followed by a reduced release kinetics at intestinal fluid but not at simulate gastric fluid stage via an in vitro digestion.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zining Zhou,Kaiji Xu,Changyong Li,Jianbin Lin,Juanjuan Bian,Kang Sun,Jianchun Jiang,Shu-Feng Zhou,Guowu Zhan
Three-dimensional (3D) printed monolithic catalysts/adsorbents have attracted much attention due to their excellent properties. Herein, the rice husk-derived nitrogen-doped biochar (using urea as the nitrogen dopant) was printed into monolithic adsorbents using direct ink writing technology, and then assembled as agitating paddles for organic dye adsorption. To reduce the over-embedding of active sites in the polymeric matrix, CaCO 3 particles in nano-sized or micron-sized were added as sacrificial pore generators to form macropores and expose active sites, leading to an enhanced mass transfer efficiency. Material characterization results confirm the self-sacrificial role of CaCO 3 . The 3D-printed adsorbents with micron-sized CaCO 3 (denoted as 3D-HRSCCm) possessed excellent adsorption performance, as evidenced by a high adsorption capacity and kinetics study. Meanwhile, 3D-HRSCCm adsorbents were mounted as agitating impellers which demonstrated excellent reusability with the adsorption efficiency remaining above 90% after ten cycles. Furthermore, the 3D-HRSCCm exhibited excellent adsorption properties for various dyes such as methylene blue, rhodamine B, crystal violet, and malachite green. Moreover, the numerical simulation confirms that the introduction of CaCO 3 as a pore generator improved diffusion by providing wider channels and facilitated the mass transfer that accelerated the adsorption rates.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Zhichao Bao,Vivian F. Lotfy,Xuesong Zhou,Shiyu Fu,Altaf H. Basta
Agricultural wastes are huge source of organic materials for preparation of active carbon, which can be applied to water treatment by absorbing the dissolved substances. Rice straw (RS) or their pulping byproducts, Kraft black liquor (KBL) and kraft lignin (Lignin-KBL) are used as precursors for the preparation of activated carbons (ACs). The process was carried out with activation assistance of potassium ferrate (K 2 FeO 4 ). The optimum temperature of activation on RS precursor is 700 °C evaluating by the textural analysis and the liquid phase adsorption models. The prepared activated carbon (RSFAC) under K 2 FeO 4 from RS at this temperature provided highest BET surface area and total pore volume (440.5 m 2 /g and 0.274 cm 3 /g). It had excellent adsorption capacities of cationic and anionic dyes and a maximum adsorption capacity of iodine (585.2 mg/g). Applied the optimum activation temperature to pulping by-products (KBL), the result showed AC with BET surface area and total pore volume of 378 m 2 /g and 0.218 cm 3 /g, respectively. These results are higher than that obtained from using phosphoric acid activating agent, and at temperature 450 °C (BET surface area and total pore volume were 310.6 m 2 /g and 0.243 cm 3 /g). The ferrate activation of RS and lignin-KBL is contributed to the function of iron oxide as an oxidation catalyst, which gave the ACs with mesoporous and microporous. Regarding to the liquid phase adsorption models and kinetics, anionic dye adsorption equilibriums of all RSFACs (Coomassie brilliant blue R-250 CBB) follow the Freundlich model, but the cationic methylene blue dye adsorption equilibriums mostly follow the Langmuir model. Adsorption kinetics of these RSFACs are well-explained in terms of dye kinetic adsorption by the pseudo-second-order model. The procedures for AC preparation from rice straw under K 2 FeO 4 provided a good route to utilize agricultural residues.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Dinghao Zhang,Lijuan Dong,Mengwei Dong,Xingye Yao,Shaozhou Li,Hengchang Bi,Xiao Huang,Jian Zhang
Boron nanosheets with high surface hydrophilicity and proton conductivity are promising for ionic devices. However, their poor electrical conductivity has severely limited their applications in resistive-type electronic devices. Herein, electrically conductive three-dimensional boron/MXene hollow spheres were prepared by a freeze-drying-assisted self-assembly method. The composites were fabricated into resistive-type humidity sensors, which showed high sensitivity with a three-orders-of-magnitude variation in resistance, a wide detection range (11–97%), fast response and recovery time (4 s/3.8 s), and long-term stability. The excellent humidity sensing performance can be attributed to the abundant hydrophilic groups on both the inner and outer surfaces of open spheres as well as to a coupled hole/proton conducting process. As a proof of concept, real-time remote monitoring of human respiration was achieved by integrating our humidity sensor with a Bluetooth module, enabling differentiation of breathing frequency as rapid as 0.8 s.
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危险品化学品经营许可证（带存储）