ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Jiabao Zhu,Linghong Lu,Lili Shi,Zhongyang Dai,Wei Zhuang,Zhengsong Weng
The hydrophilicity/hydrophobicity of heterogeneous interface of the electrode material is critical for the performance of ionic liquids supercapacitors . However, the behavior of electrolytes at the electrode interface, especially the interface microstructure and properties is not yet clear. We investigated the electric double-layer of [emim][DCA] on slit pore of TiO 2 /C composite with the heterogeneous surface by combining molecular dynamics simulation and experimental measurements. The results of simulation show that coverage ratio of carbon on the surface affect the number density distribution, orientation and diffusion coefficient of [emim][DCA]. Moreover, we calculated the charge distribution of electric double-layer of [emim][DCA] and the capacitance. The results indicate that the capacitance of slit pore with the surface of TiO 2 with 78.7% carbon coverage ratio has the highest capacitance at high surface charge density. We performed an electrochemical experiment using composite of TiO 2 covered with carbon as the electrode material, and obtained the capacitance from cyclic voltammetry (CV). The experimental results also indicate there is an optimal coverage ratio of carbon, which achieves the highest capacitance. Our researches could provide a microscopic perspective of the electric double layer at the heterogeneous interface and the guidance for the design of electrode material.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Fangya Qi,Lianyi Shao,Xiaoyi Lu,Guoping Liu,Xiaoyan Shi,Zhipeng Sun
Establishing heterostructure is an effective strategy to improve the cycling and rate properties of electrode due to high charge transfer kinetics. Nevertheless, it is still a great challenge to prepare a reasonable heterojunction material with appropriate electrochemical property as anode for Na/K ion batteries. In this work, a novel MXene derivative consisted of TiSe 2 /TiO 2 /C heterostructured hexagonal prism has been prepared by a simple solid phase sintering method to converting Ti 3 C 2 T x MXene to TiSe 2 /TiO 2 /C. In this composite, TiSe 2 and TiO 2 with different work functions can induce a built-in electric field in the heterojunction interface, accelerating the electrochemical courses. Serving as an anode material for Na ion batteries , TiSe 2 /TiO 2 /C can keep a discharge capacity of 280 mAh g −1 at 5 A g −1 after 1000 cycles and a superior rate capability with 212 mAh g −1 even at 10 A g −1 . Even using as anode for K ion batteries , TiSe 2 /TiO 2 /C can still retain a capacity of 121 mAh g −1 at 0.1 A g −1 after 800 cycles. This work supplies a simple approach to design metal oxide/selenide heterostructures toward Na/K ion batteries with excellent performance and promotes the application of MXene derivatives in the field of energy storage.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Separations
·
2023
·Vol. 10
·期 12
·580
·
IF 2.6
Jinmei Zhu,Xiaofei Wen,Yuanhui Feng,Shuaibing Ren,Zimo Lou,Jiansheng Li
Cathodic reduction is a green and promising remediation strategy for reducing the antibacterial activity of antibiotic contaminants and increasing their biodegradability. However, the lack of cost-effective electrocatalysts has restricted its application. In this study, we upcycled textile white mud by separating 1,4-dicarboxybenzene (BDC) and fabricating MIL-125(Ti)-derived amorphous TiO2@C (TiO2@C-W) as a functional electrocatalyst. The separated BDC from white mud shows lower crystallinity than BDC chemicals, but the resulting TiO2@C-W features a much higher degree of oxygen vacancies and a 25-fold higher specific surface area than that of TiO2@C derived from BDC chemicals. With florfenicol (FLO) as a probe, TiO2@C-W exhibits similar cathodic reductive activity (0.017 min−1) as commercial Pd(3 wt.%)/C (0.018 min−1) does, which was 1.4 and 3.7 times higher than that of oxygen vacancy-engineered TiO2and TiO2@C, respectively. The as-fabricated TiO2@C-W could not easily remove FLO via the oxygen reduction reaction-based pathway with the applied bias for cathodic reduction. Though the activity of TiO2@C-W undergoes a slight decline with continuous running, more than 80% of 20 mg L−1FLO can still be reduced in the eighth run. Water chemistry studies suggest that a lower initial solution pH boosts the cathodic reduction process, while common co-existing anions such as Cl−, NO3−, HCO3−, and SO32−show a limited negative impact. Finally, TiO2@C-W shows reductive activity against several representative antibiotics, including nitrofurazone, metronidazole, and levofloxacin, clarifying its potential scope of application for antibiotics (e.g., molecules with structures like furan rings, nitro groups, and halogens). This study couples the upcycling of textile white mud with the remediation of antibiotics by developing functional electrocatalysts, and offers new insights for converting wastes from the printing and dyeing industry into value-added products.Keywords:textile white mud;1,4-dicarboxybenzene;electrocatalyst;cathodic reduction;antibiotics
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
·
IF 11.698
Jingyu Wang,Min Xu,Jianquan Zhao,Huaifang Fang,Qingzhu Huang,Weiping Xiao,Tao Li,Deli Wang
The activity and stability of Pt electrocatalysts are crucial issues for energy conversion systems involving oxygen reduction reaction (ORR). In this work, the ultrafine Pt nanoparticles were in situ reduced by the photogenerated electrons on TiO 2 surface so that most of them selectively anchored around the TiO 2 nanocrystals. The presence of well-dispersed TiO 2 on carbon surface strengthened the metal-support interaction, giving rise to the improved ORR catalytic activity with ∼49 mV positive shift of half-wave potential as compared to commercial 20 wt% Pt/C. More importantly, the Pt/TiO 2 -C catalysts exhibited a more durable performance after 10,000 cycles in terms of the decrease in electrochemical surface area (0.8%) and mass activity (0.9%), much lower than those of Pt/C (10.2% and 33.3%). The high-temperature durability test also revealed a much higher retention of ORR activity. The results demonstrated that anchoring Pt on well-dispersed TiO 2 -decorated carbon would be an effective strategy to enhance the ORR performance by strong metal-support interaction, which facilitated the electron transfer during catalytic reactions as well as prevented Pt aggregation during durability test.
研究领域:
电催化
·
能源转换
·
纳米材料
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表面科学
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物理化学
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材料化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
He Wang,Huan Liu,Shulan Wang,Li Li,Xuan Liu
TiO 2 /C nanocomposites with hierarchical porous framework were synthesized by the dual-templation method with ice and silica as the hard template. Silica of different dimensions was used as the knob to modify the TiO 2 /C pore structure and to control anatase-rutile transformation. The prepared TiO 2 /C nanocomposites with pores at three different scales with micro-, meso - and macro-pores not only prohibited aggregation of nanoparticles but also shortened the transportation distance of charge carriers. TiO 2 /C fabricated with 22 nm colloid silica as the template showed superior photocatalytic performances of 4.0 and 10.7 times of the commercial benchmark P25 under UV and visible light irradiation, respectively. The TiO 2 /C composites also showed excellent photoelectrochemical (PEC) performances with the photocurrent density of 6.3 mA/cm 2 that is 11.2 times of the control sample. The results demonstrated that the silica dimension serves a significant role for optimization of the TiO 2 /C microstructure including particle size, phase composition, surface area and thus improvement in photoelectrochemical and photocatalytic properties.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Qiao Li,Yang Huang,Zhong Pan,Jiancong Ni,Weiqiang Yang,Jianhua Chen,Ying Zhang,Jianmin Li
Novel hollow C, N-TiO 2 @C surface molecularly imprinted microspheres (HCNTC-SMIPs) with hydrophilicity, reusability, and selectivity were synthesized. The core–shell hollow structure yields large specific surface areas, high surface-to-volume ratios and effective diffusion rate on both inner and outer exposed surfaces. The C, N-TiO 2 shell possesses high photo-catalytic decomposition capacity toward the specific pollutants. Moreover, TiO 2 acts not only as a photocatalyst but also as a double cross-linker agent of molecularly imprinted to significantly reduce the molar ratio of formaldehyde. The hydrophilic surface imprinted layer provides the recognition sites and specific pore structures. The results showed that HCNTC-SMIPs possessed a high specific surface area of 305.10 m 2 g −1 and a good visible light harvesting property with a bandgap of 1.67 eV. This could efficiently suppress the photoelectron-hole recombination, and thereby heightening the photocatalytic degradation of sulfadiazine (SDZ). The photodegradation efficiency of HCNTC-SMIPs can reach 99.25 % within 140 min and 90.00 % after 6 cycles. The HCNTC-SMIPs had a higher kinetic constant (0.01815 min −1 ) than those of HCNTC (0.00964 min −1 ) and TiO 2 (0.00548 min −1 ). HCNTC-SMIPs can achieve targeted and efficient SDZ removal, as well as in-situ regeneration. The possible degradation pathways of SDZ primarily includes smiles-type rearrangement, SO 2 extrusion, ring hydroxylation, direct oxidation and S N bond cleavage processes based on LC-MS analysis.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Yan Li,Guangyu Chen,Jie Lin,Liuqing Huang,Chentong Zhang,Xuetao Luo
TC4 (Ti–6Al–4V) nanoparticles (TC4NPs) and silicon nanoparticles (SiNPs) with a median size of 146 and 51 nm were prepared by sand milling from scrap produced by refining silicon and TC4. The SiNPs and TC4NPs are mixed, carbonized, and leached in different proportions to obtain Si@C/TiO2@C/Hollow-C anode materials. The special structure of the anode materials provided more space for the volume expansion of silicon. The anatase TiO2 in TC4NPs relieves the volume expansion and reduces the transfer impedance, and the lithiated TiO2 can promote the electrical conductivity of the Si@C/TiO2@C/Hollow-C anode during the charge/discharge process. Furthermore, the Si@C/TiO2@C/Hollow-C (SiNPs/TC4NPs = 2:1) electrode delivers excellent rate performance; after cycling at a series of higher current densities, 92% of the original level of the reversible capacity can be maintained. The Si@C/TiO2@C/Hollow-C (SiNPs/TC4NPs = 2:1) anode retains 558 mA h·g–1 after 400 cycles with a large current density of 1000 mA·g–1. The synthesis method of the Si@C/TiO2@C/Hollow-C anode is a low-cost, facile, and nontoxic process, endowing it with the potential for application as energy materials for mass production.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Lixin Song,Xin Yin,Xueyao Xie,Pingfan Du,Jie Xiong,Frank Ko
In this study, highly flexible TiO 2 /C nanofibrous film was fabricated via electrospinning followed by thermostabilization and carbonizaiton. These nanofibers (NFs) composed of carbon and TiO 2 nanoparticles (NPs) with incorporation of TiO 2 NPs into carbon matrix. The content of polyvinylpyrrolidone (PVP) and titanium (IV) isopropoxide (TiP) were adjusted to optimize the performance of the TiO 2 /C nanofibrous film. The results show that the average diameter of TiO 2 /C NFs and the content of carbon in NFs decreased as the proportion of PVP increased. With addition of PVP, TiO 2 NPs distributed more uniformly. With increase of TiP, the average diameter and content of TiO 2 increased. As a result, the conductivity decreased with the increase of PVP and TiP. While, the flexibility increased, reaching a best value before decreasing as the PVP and TiP increased. The TiO 2 /C nanofibrous film presented best flexibility with the content of PVP and TiP of 50% and 0.7 g. Notably, the flexible TiO 2 /C nanofibrous film showed pleasurable catalytic activity. Therefore, the TiO 2 /C nanofibrous film served as platinum (Pt)- and transparent conducting oxide (TCO)-free counter electrode (CE) for flexible dye-sensitized solar cells (FDSSCs). Besides, the TiO 2 /C nanofibrous film CE withstood large deformation of bending and exhibited excellent bending stability.
研究领域:
材料科学
·
纳米科技
·
能源材料
·
光电化学
·
柔性电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Jiao Wang,Yilin Liu,Lin Cheng,Rongsheng Chen,Hongwei Ni
Nickel-based enzymeless glucose sensors have been extensively explored. However, poor conductivity and severe aggregation of nickel-base nanocomposites often reduce the performance of its practical applications. Herein, free-standing TiO 2 /C core-shell nanofiber arrays (TiO 2 /C NFAs) were fabricated directly on a titanium foil to serve as the one-dimensional (1D) conductive substrate. Nickel-cobalt binary nanoparticles were then deposited on the nanofibers to form the NiCo/TiO 2 /C NFAs for enzymeless glucose sensing. The NiCo/TiO 2 /C NFAs exhibit much improved sensitivity and excellent stability towards glucose determination, with a wide linear range from 1 μM to 7658 μM, and a high sensitivity of 975.3 μA mM −1 cm −2 . The detection limit is calculated to be 0.6 μM (S/N = 3). The NiCo/TiO 2 /C NFAs also show excellent selectivity with minimal interference from the coexistent species. The superior analytical performance should be attributed to the large specific surface area of the 1D nanostructure , direct electron transfer pathway via the free standing TiO 2 /C NFAs, and high activity of the binary Ni–Co electrocatalyst .
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Chenxiao Chu,Jing Yang,Qianqian Zhang,Nana Wang,Feier Niu,Xuena Xu,Jian Yang,Weiliu Fan,Yitai Qian
Flower-like assembly of ultrathin nanosheets composed of anatase and bronze TiO2 embedded in carbon is successfully synthesized by a simple solvothermal reaction, followed with a high-temperature annealing. As an anode material in sodium-ion batteries, this composite exhibits outstanding electrochemical performances. It delivers a reversible capacity of 120 mA h g–1 over 6000 cycles at 10 C. Even at 100 C, there is still a capacity of 104 mA h g–1. Besides carbon matrix and hierarchical structure, abundant interfaces between anatase and bronze greatly enhance the performance by offering additional sites for reversible Na+ storage and improving the charge-transfer kinetics. The interface enhancements are confirmed by discharge/charge profiles, rate performances, electrochemical impedance spectra, and first-principle calculations. These results offer a new pathway to upgrade the performances of anode materials in sodium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
JiuWu Wang,Caini Yang,Siyao Chen,Yinping Wu,Xian Sun,Chenguang Huang,Rui Tang,Jiasheng Ke,Yi Dai,Yue Situ,Hong Huang
High-performance sodium-ion batteries (SIBs) are highly expected in the field of large-scale static energy storage due to the low expenditure and abundant sodium resource. However, the sodium storage performance of anode materials for SIBs has suffered from the foot-dragging reaction kinetics arising from large-size Na + during intercalation/deintercalation, which imposes more stringent requirements on the morphology and structure of the potential anode electrodes. Herein, we successfully designed and synthesized a three-dimensional (3D) heterojunction as anode material for SIBs, which assembled by interlayer-expanded MoSe 2 nanosheets perpendicularly anchored on the nitrogen-doped branched TiO 2 @C nanofibers (MoSe 2 @NBT@CNFs). Not only does the branched TiO 2 @C nanofibers suppress the severe self-aggregation of MoSe 2 nanosheets but also buffer the volume expansion during the cycling process. Moreover, an expanded interlamellar distance of MoSe 2 nanosheets accelerate sodium ion diffusion, and strong chemical interactions between MoSe 2 nanosheets and carbon nanofibers are conducive to improve the charge-transfer kinetics and reinforce the structural durability. As might be expected, the MoSe 2 @NBT@CNFs anode can deliver excellent cycling performance with high reversibility (315.2 mAh g 1 after 800 cycles at 2 A g 1 ) and remarkable rate capability (194.2 mAh g 1 at 30 A g 1 ). The rational design strategy could offer guidance for developing high-performance metal chalcogenide-based electrode materials for SIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Xinxi Li,Long Liu,Baoping Liu,Hanjiang Li,Wen Luo,Guoqing Zhang,Xiaofeng Zhang,Changhong Wang
Silicon holds bright promise as the anode material for next-generation lithium-ion batteries (LIBs). Unfortunately, it is limited by enormous volume expansion and fast capacity fading in long-cycling or large current density. Here, we propose an in-situ assembling path to form a stable Si nanocomposite by introducing bicontinuous TiO 2 -C layer and graphene nano-sheets, and further enhance the stability for long-term LIBs. The enhanced synergistic coupling of graphene and bicontinuous TiO 2 -C layer and introduced Ti C bond effectively improve long-cycling structural stability of Si nanocomposite for promising LIBs anode material. This anode material exhibits high capacity, long-term cycling and high-rate performance. Especially, it showed the high reversible capacities of 2147.6 mA h g −1 at 0.5 A g −1 after 800 cycles and 1328.2 mA h g −1 at 2 A g −1 after 500 cycles, which is much better than that of TiO 2 -C@Si and nano Si anodes. Moreover, the full cell including this composite anode and commercial LiFePO4 cathode exhibits a high capacity retention after 100 cycles. Our work demonstrates that this surface functionalization strategy can enhance synergistic coupling and introduce Ti C bond to regulate the stability of Si nanocomposite as long-cycling LIBs anode.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）