ADVANCED FUNCTIONAL MATERIALS
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2019
·Vol. 30
·期 5
·1908309
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IF 15.621
Sainan Luo,Tao Yuan,Luke Soule,Jiafeng Ruan,Yahui Zhao,Dalin Sun,Junhe Yang,Meilin Liu,Shiyou Zheng
Ion-insertion capacitors show promise to bridge the gap between supercapacitors of high power densities and batteries of high energy densities. While research efforts have primarily focused on Li + -based capacitors (LICs), Na + -based capacitors (SICs) are theoretically cheaper and more sustainable. Owing to the larger size of Na + compared to Li + , finding high-rate anode materials for SICs has been challenging. Herein, an SIC anode architecture is reported consisting of TiO 2 nanoparticles anchored on a sheared-carbon nanotubes backbone (TiO 2 /SCNT). The SCNT architecture provides advantages over other carbon architectures commonly used, such as reduced graphene oxide and CNT. In a half-cell, the TiO 2 /SCNT electrode shows a capacity of 267 mAh g −1 at a 1 C charge/discharge rate and a capacity of 136 mAh g −1 at 10 C while maintaining 87% of initial capacity over 1000 cycles. When combined with activated carbon (AC) in a full cell, an energy density and power density of 54.9 Wh kg −1 and 1410 W kg −1 , respectively, are achieved while retaining a 90% capacity retention over 5000 cycles. The favorable rate capability, energy and power density, and durability of the electrode is attributed to the enhanced electronic and Na + conductivity of the TiO 2 /SCNT architecture.
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Catalysts
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2019
·Vol. 9
·期 10
·848
·
IF 3.444
Cheng Gong,Shiyin Xu,Peng Xiao,Feifan Liu,Yunhui Xu,Jin Yang,Rui Li,Xuan Wang,Jun Du,Hailong Peng
A hybrid material of indium tin-oxide (ITO) wrapped titanium dioxide and reduced graphene oxide (ITO-rGO and TiO2) was prepared using a facile hydrothermal technique. TiO2nanorods were in situ grown on the surface of rGO (rGO and TiO2), and which was then assembled onto ITO substrate layer by layer with formation of a 3D structure. ITO-rGO and TiO2exhibit low charge transfer resistance at the electrode-electrolyte interface and have good photoresponsive ability. Methylene blue (MB) can be effectively adsorbed and enriched onto ITO-rGO and TiO2surface. The adsorption kinetics and thermodynamics of ITO-rGO and TiO2were evaluated, showing that the exothermic and entropy-driven reaction were the main thermodynamic processes, and the Langmuir isotherm was the ideal model for adsorption fitting. Meanwhile, ITO greatly improved degradation of rGO and TiO2because electrons can be collected by ITO before recombination and MB can easily enter into the 3D structure of rGO and TiO2. The highest photodegradation rate of MB reached 93.40% for ITO-rGO and TiO2at pH 9. Additionally, ITO-rGO and TiO2successfully solved the problems of being difficult to recycle and causing secondary pollution of traditional TiO2catalysts. Therefore, ITO-rGO and TiO2may be a potential photocatalyst for degrading organic pollutants in water.Keywords:ITO-rGO and TiO2;methylene blue;photocatalysis;adsorption;mechanisms
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Catalysts
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2020
·Vol. 10
·期 1
·69
·
IF 3.52
Zhen Cao,Tingting Zhang,Pin Ren,Ding Cao,Yanjun Lin,Liren Wang,Bing Zhang,Xu Xiang
We demonstrate that using neoprene as a binder during the fabrication of TiO2-coated fabrics enhances the rates of photodegradation of dyes by the fabrics. The neoprene binder simultaneously modifies the surface of the TiO2particles with Cl and dopes the TiO2with Cl, without requiring high temperatures or other harsh laboratory treatments. The adsorption of chlorine on the surface and doping of the lattice with chlorine were confirmed by X-ray photoelectron spectroscopy. The chloride ions adsorbed onto the TiO2surface introduces a negative surface charge that enhances electrostatic adsorption of cationic dyes, and greatly improves the self-sensitizing degradation performance of the dyes. Chloride ions replace lattice oxygen atoms in TiO2, inducing lattice oxygen vacancies, that reduce the apparent band gap of the TiO2particles, enhancing its absorption of visible light, and further increasing the photocatalytic activity of the composite-coated fabric. The degradation rates of RhB and MB over 50 min were 95.2% and 96.0%, respectively. The degradation rate for MO reached 95.4% after 180 min. We also show that •OH and •O2−are active agents in the dye-degradation mechanism. Moreover, the photocatalytic performance of the composite-coated fabric was unchanged after eight cycles of photocatalytic degradation of RhB, demonstrating that the photocatalyst-coated fabrics was highly recyclable.Keywords:TiO2-coated fabrics;self-sensitizing degradation;neoprene;chlorine doping;oxygen vacancies
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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Yingying Qin,Hong Li,Jian Lu,Fanying Meng,Changchang Ma,Yongsheng Yan,Minjia Meng
In the practical photocatalytic hydrogen evolution process, the light absorption, charge carrier separation and optimizing the activation ability of reactive molecules are the pivotal factors that restrict photocatalytic performance. Hence, we rationally engineer novel CdS/Ti 3+ /N-TiO 2 (TNTC) composite photocatalyst via integrating the evaporation induced self-assembly (EISA) and in-situ hydrothermal method. In the TNTC system, Ti 3+ /O V and doped N respectively locate at below the conduction band (CB) and above the valence band (VB) of TiO 2 to shorten the band gap from two inverse directions, thereby improving light utilization efficiency. The type II heterojunction TNTC with interfacial coupling effect can foster the spatial charge separation and the Ti 3+ can form hydrogenation layer to reduce the activation barrier of H 2 , which all can improve H 2 evolution capacity. Integrating with the above advantageous qualities, the 10%CdS/Ti 3+ /N-TiO 2 (TNTC10) has the best photocatalytic H 2 evolution activity (1118.5 μmol), which is about 15 and 40 times higher than that of CdS (71.6 μmol) and Ti 3+ /N-TiO 2 (TNT, 27.7 μmol), respectively. Furthermore, we also test the photocatalytic activity of 10%CdS/N-TiO 2 (NTC10) to facilitate comparison with TNTC10. Expectedly, the photocatalytic activity of TNTC10 is 6 times higher than that of NTC10 (178.3 μmol), uncovering that the Ti 3+ hydrogenated layer plays a pivotal role in boosting the efficiency of H 2 evolution. It is hoped that this work will provide a new cognitive perspective and understanding for building new-fashioned hydrogen evolution photocatalysts.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 137
·期 13
·48516
·
IF 2.188
Xiao-Fang Song,Jiang-Tao Qin,Ting-Ting Li,Guo Liu,Xiang-Xiang Xia,Yue-Sheng Li,Yi Liu
Enriched selective adsorption-photocatalytic activity of Poly (vinyl alcohol)/Polyaniline/TiO 2 (PVA/PANI/TiO 2 , noted as PAT) recyclable hydrogel photocatalyst with 3D structures were prepared by self-assembling and electron beam radiation crosslingking method. TiO 2 nanoparticles were successfully introduced into the 3D matrix of the PVA/PANI hydrogel and manifested by FTIR, TG, XRD, XPS, and SEM-EDS. The microstructure of PAT was characterized further by SEM, TEM, and BET. The highly selective adsorption-photocatalytic activity of PAT was tested by the degradation of cationic or anionic dye and reduction of heavy metal ion in a closed and flow system under UV light irradiation. The results showed that PAT had a highest selective adsorption-photocatalytic performance at the appropriate content of PVA (10 wt %), TiO 2 (15 wt %) and suitable radiation dose (50 kGy), which could be attributed to the synergistic effect of excellent selective adsorption and effective photocatalytic degradation. The mechanism of selective adsorption-photocatalytic on PAT was revealed synchronously in this study. Particularly, the novel PAT photocatalyst with 3D network structure also affords ease of separation and recycling, which is beneficial to water purification in a flow system. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48516.
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NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 43
·20777-20785
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IF 3.925
Yanke Yu,Mengqiao Geng,Desheng Wei,Chi He
Selective catalytic oxidation of NH3 (NH3-SCO) is a promising method to reduce NH3 pollution. The Pt-based catalysts exhibited excellent activity in the NH3-SCO reaction under low temperatures. However, it was easy for the NH3 to be oxidized to N2O and NOx (NO and NO2) over the Pt-based catalyst, causing a low N2 selectivity. The CuSO4, which could supply both Brønsted and Lewis acid sites on the catalyst, was used to promote N2 selectivity. The N2 adsorption–desorption, X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), inductively coupled plasma mass spectrometry (ICP-MS), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), NH3-temperature programmed desorption (NH3-TPD), H2-temperature programmed reduction (H2-TPR) and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) were used to characterize the catalyst. The addition of CuSO4 could suppress the formation of N2O and NOx, thus the highest N2 selectivity on the catalyst increased from 21.2% to 78.1%. An imide mechanism was the main reaction mechanism on the Pt/TiO2 catalyst. After adding CuSO4, the NH3-SCO reaction over the CuSO4-Pt/TiO2 catalyst mainly followed an i-SCR mechanism where NH3 was oxidized to N2O and NOx, and then the newly formed N2O and NOx were reacted with NH3/NH4+ adsorbed on the Lewis and Brønsted acid sites via an NH3-SCR reaction over the catalyst, and finally N2 was formed. The acid sites performed an important role in the formation of N2 and this work should provide an effective method to promote N2 selectivity in a NH3-SCO reaction.
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OPTICAL MATERIALS
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2022
·
IF 3.754
Jingtao Zhang,Mengwan Zhai,Xueying Wang,Shurui Liu,Lijuan Zhang,Xing Liu,Yao Geng,Xiaodong Sun,Bingkun Liu
In the present work, Ti 3+ -self-doped TiO 2 heterostructure photocatalysts were prepared by coupling with different additions of palladium quantum dots by means of deposition-reduction methodology. The electron paramagnetic resonance (EPR) analysis indicated the existence of Ti 3+ in synthesized samples. The transmission electron microscopy (TEM) images presented the modification of TiO 2-x nanoparticles by coupling with nano palladium. Photoluminescence (PL) results demonstrated the lowest charge carrier recombination rate in 5% Pd/TiO 2-x composites. Photocatalytic performances of photocatalysts were evaluated by degrading Tetracycline (TC) and inactivating Escherichia coli ( E. coli ) and Fusarium oxysporum f. sp. Vasinfectum ( Fov ) with the presence of visible light , in which an enhanced photocatalytic degradation and inactivation activity was found in all Pd coupled composites with the highest efficiency in 5% Pd/TiO 2-x . The improved photocatalytic activity of Pd/TiO 2-x was associated to the generation of more hydroxyl radicals (•OH) and superoxide anions radicals (•O 2- ) during photocatalytic process which were demonstrated by the electron spin-resonance spectroscopy (ESR) technique. Moreover, 5% Pd/TiO 2-x composites were found to remain high photocatalytic properties in a circulating photo-disinfection system.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Yangjie Li,Yirong Tian,Yu Fu,Liang Pang,Yang Li,Peng Xiao,Zhuan Li
Smart surface coatings have been proven to be an effective strategy to significantly enhance the electronic conductivity and cycling stability of silicon-based anode materials. However, the single/conventional coatings face critical challenges, including low initial Coulomb efficiency (ICE), poor cyclability, and kinetics failure, etc. Hence, we proposed a dual immobilization strategy to synthesize graphene supported anatase TiO 2 /carbon-coated porous silicon composite (denoted as PSi@TiO 2 @C/Graphene) using industrial-grade ferrosilicon as lithium storage raw materials through the simple etching, combined with sol–gel and hydrothermal coating processes. In this work, the dual immobilization from the “confinement effect” of the inner TiO 2 shell and the “synergistic effect” of the outer carbon shell, improves the kinetics of the electrochemical reaction and ensures the integrity of the electrode material structure during lithiation. Furthermore, the introduction of the graphene substrate offers ample space for dispersing and anchoring the Si-based granules, which in turn provides a stable 3D conductive network between the particles. As a result, the PSi@TiO 2 @C/Graphene electrode delivers high reversible capacity of 1605.4 mAh g −1 with 93.65% retention at 0.5 A g −1 after 100 cycles (vs. 4th discharge), high initial Coulomb efficiency (82.30%), and superior cyclability of 1159.9 mAh g −1 after 250 cycles. The above results suggest that the particle structure has great potential for applications in Si-based anode and may provide some inspiration for the design of other energy storage materials.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Xiang Liu,Zecheng Ni,Yuanyuan Cao,Ping Wang,Xiaohua Zhao
Icosahedral AuPd bimetallic nanoparticles exhibit the localized surface plasmon resonance effect with their excellent thermocatalytic activity. However, the nanoparticle aggregation and recovery difficulty challenge the widespread adoption. In this work, we designed and fabricated a yolk-shell structured icosahedral AuPd/carbonized poly-dopamine sphere@titanium dioxide (I-AuPd/C-PDA@TiO 2 ), which exhibited excellent catalytic performance towards photocatalytic selective oxidation of benzyl alcohol (BA). Specifically, the introduction of C-PDA not only improved the chemical stability of AuPd nanoparticles but also promoted electron transfer . Meanwhile, the controlled growth of monodisperse icosahedral AuPd benefited the selective oxidation of BA due to the LSPR effect. Compared to yolk-shell Pd/C-PDA@TiO 2 , Au/C-PDA@TiO 2 and spherical AuPd/C-PDA@TiO 2 (S-AuPd/C-PDA@TiO 2 ) photocatalysts , I-AuPd/C-PDA@TiO 2 showed the highest catalytic performance with 96.0% conversion rate and 99% selectivity in 6 h under an O 2 -saturated reaction environment. Moreover, no obvious performance decay was observed with I-AuPd/C-PDA@TiO 2 after five successive cycles, confirming the outstanding stability of I-AuPd/C-PDA@TiO 2 . The current strategy would be a significant contribution of AuPd bimetallic nanocrystals for plasmon-enhanced catalysis.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Xinwei Zhang,Xiaotian Zhang,Rong Wang,Yijia Zhong,Kunting Li,Lei Xu,Huimin Feng
S-scheme heterojunction catalysts have attracted much attention due to their ability to effectively separate photo-generated electrons and holes while optimizing the redox ability of carriers. We have prepared an efficient visible-light catalytic PDPB/Ag–TiO 2 S-scheme heterojunction by in-situ synthesis methods . The catalysts were characterized for their structure, composition , morphology, and photoelectrochemical properties. The hydrogen production rate of PDPB/Ag–TiO 2 -2 was 1473.6 μmol/g/h. The results of SPV analysis showed that the spontaneous interfacial charge transfer from PDPB to Ag–TiO 2 in the contact interface region resulted in the presence of an internal electric field . This enhanced internal electric field effectively drove directional charge migration through the S-scheme mechanism, improving charge separation and utilization. The PDPB/Ag–TiO 2 -2 composites also maintained stable photocatalytic activity after running for four cycles. Overall, this study brings fresh preparation ideas for the conjugated polymer-TiO 2 composites with high photocatalytic efficiency.
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Journal of Cleaner Production
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2023
·
IF 11.1
Fan Luo,Min Li,Xianghui Liang,Jingxian Yang,Shuangfeng Wang,Xuenong Gao,Zhengguo Zhang,Yutang Fang
Adsorption separation and photocatalytic techniques have emerged as effective methods to eliminate organic dyes from water environment, but the poor recycling of most powdered adsorbents and photocatalysts in aqueous solutions hinders their commercial viability. Herein, we propose an effective and reusable dye-elimination module through the bottom-up self-assembly of photocatalyst (TiO 2 nanoparticles) and adsorbent (Al-fumarate) on a corrugated paper (CP) support. Results show that the hydrophilic and electrostatic interactions between the components ensure the integrity of the whole module in aqueous phase dyes, thereby ensuring its practicality and cyclic stability (10 times). Al-fumarate with a superior specific surface area of (1117.82 m 2 /g) and porosity (0.47 cm 3 /g) on the substrate serves to induce and capture the dye molecules, while TiO2 nanoparticles with a wide bandgap trigger a redox reaction to further degrade the organic pollutants . Through the synergistic effect between adsorption and photocatalytic strategies, the resultant functional CP-based composite exhibits superior dye-removal performance than other potential composite materials, reaching 98.93% degradation efficiency of congo red (CR) solution (25 mg/L), and 97.91% elimination capacity of methylene blue (MB) solution (20 mg/L). Therefore, the designed dye-elimination module can serve as a convenient, recyclable, and efficient cleaning module in practical wastewater treatment fields.
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Molecular Catalysis
·
2023
·
IF 4.6
Shunfeng Li,Tingting Song,Wenting Zhou,Zenglin Wang,Yi Ma
Cocatalyst act as the active site usually plays an important role in both photocatalytic hydrogen evolution reaction (HER) and carbon dioxide reduction reaction (CO 2 RR). As the size, distribution, location, contact behavior with semiconductor etc. show significant effects for the activity. In this work, the active site environment (aggregation state of the active site of the cocatalyst) was modulated by locating the different amounts of CuO x nanoparticles (NPs) into the porous TiO 2 (CuO x @TiO 2 ), which was achieved by calcination of Cu@MIL-125 as the precursor. The composition, morphology, and chemical state of the catalyst were analyzed by a series of characterization methods. The results showed that the embedded CuO x NPs exhibited obviously better dispersion than the externally supported ones, especially at the high loading amount. Cu NPs totally transformed to CuO at the lower loading amount, while it transformed to CuO x with partial Cu (I) species existence at the higher loading amount. Photocatalytic reactions showed that the activity of CuO x @TiO 2 was ∼ twice that of the traditional outside loading catalyst CuO x /TiO 2 in both HER and CO 2 RR. The high HER activity was obtained at relatively lower loading capacity (0.200 wt%∼0.500 wt%), while CO 2 RR was the advantageous reaction at higher loading capacity (5.000∼15.000 wt%). Apparently, CuO x @TiO 2 offered a quite different active site environment for the two type of reactions. The embedded structure can provide highly dispersed single active sites for HER at lower loading capacity, while it facilitates the formation of multi-electron environment under irradiation for CO 2 RR at higher loading capacity. The construction of an appropriate active center environment determines the occurrence of high-efficiency photocatalytic reactions.
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