International Journal of Electrochemical Science
·
2023
·Vol. 12
·期 8
·6930-6939
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IF 1.5
Wei Su,Kaiqi Xu,Guobin Zhong,Zengfu Wei,Chao Wang,Yuezhong Meng
Titanium and nitrogen codoped LiFePO 4 was synthesized via a simple solid state reaction using TiN as the dopant source. The morphology, structure, valence state and electrochemical performance of all the samples were investigated and compared with the undoped LiFePO 4 . The results showed that the codoped samples maintained an olivine structure with modified lattice parameters and exhibited a prominent improved electrochemical performance. Among all the codoped samples, LiFe 0.94 Ti 0.04 PO 4-σ N 0.04 showed the best rate capability of 108.1 mAh g -1 even at a high rate of 5 C and exhibited a capacity retention of about 94% after 100 cycles at 1 C.
研究领域:
材料科学
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电化学
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能源存储
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无机化学
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固态化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Xia Wu,Shi-Xi Zhao,Lei Wei,Hui Deng,Ce-Wen Nan
Li 2 MnSiO 4 cathode material suffers from structure collapse and thus rapid capacity fading during cycling. Here, we employed the stable [TiO 6 ] ligands as a local pillaring framework to improve the structural stability. Porous Li 2 MnSi 1- x Ti x O 4 /C nanoparticles were successfully synthesized by employing SBA-15 as Si source. Rietveld refinement revealed Ti substitution caused the phase composition transition (partial Pmnb to Pmn 2 1 phase), which contributed to higher charge/discharge capacity. XPS confirmed the positions of Ti 4+ and the formation of [TiO 6 ] octahedrons. 15 mol% Ti doped sample (S-LMST) showed a highest specific surface area of 114.25 m 2 g −1 and delivered a highest initial discharge capacity of 182.7 mAh g −1 under 1.5–4.8 V. Interestingly, S-LMST electrode presented excellent cycling stability, especially retaining ∼94% of initial discharge capacity after 8th cycles, while pristine Li 2 MnSiO 4 only retained ∼55%. Additionally, S-LMST electrode exhibited higher discharge capacity under lower cut-off voltage. The maximal initial discharge capacity can reach to 259.7 mAh g −1 in 1.5–4.6 V. The enhanced cycling stability can be mainly ascribed to the pillaring effect of [TiO 6 ] octahedrons and the decreased charge transfer resistance, as well as the improved Li + diffusion coefficient due to porous structure.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Rui Yang,Fan Zhang,Xin Lei,Yongping Zheng,Guohua Zhao,Yongbing Tang,Chun-Sing Lee
Magnesium-ion batteries (MIBs) have received increasing attention for next-generation energy storage recently because of the natural abundance, high capacity, and dendrite-free deposition of Mg. However, their applications are hindered by irreversible Mg anode plating in conventional electrolytes and the lack of cathode materials, demonstrating high working voltage, satisfactory Mg2+ diffusivity, and long cycling life. In this work, we first developed a novel magnesium-ion based dual-ion battery (Mg-DIB) by utilizing expanded graphite as the cathode and Ti-doped niobium pentoxide nanoflakes (Ti–Nb2O5 NFs) as the anode. The Ti–Nb2O5 NFs showed hierarchical structures of microspheres with diameters of 4–5 μm assembled by nanoflakes. For the first time, the Mg-ion storage mechanism in Ti–Nb2O5 NFs was investigated. Benefiting from the hierarchical structure design and pseudocapacitive intercalation behavior of Mg ions, the Ti–Nb2O5 NF anode exhibited fast Mg-ion diffusion. Consequently, the Mg-DIB exhibited a high discharge capacity of 93 mA h g–1 at 1 C (1 C corresponding to 100 mA g–1), along with good long-term cycling performance with a capacity retention of 79% at 3 C after 500 cycles. The Mg-DIB also demonstrated a capacity retention of 77% at 5C, indicating its good rate performance. Moreover, the Mg-DIB exhibited a high discharge medium voltage of ∼1.83 V, thus enabling a high energy density of 174 W h kg–1 at 183 W kg–1 and 122 W h kg–1 at a high power density of 845 W kg–1, among the best of the reported magnesium-ion full batteries. Our work provides a new strategy to improve the performance of MIBs and other rechargeable batteries.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 20
·17571-17579
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IF 2.324
Zhong Canyu,Lai Qi,Liao Xianjie,Li Yufeng,Wu Jinggao
Porous Ti-doped MoO 2 was successfully synthesized through one-pot hydrothermal method and used as an anode material for lithium ion batteries (LIBs). It delivers an initial discharge capacity of 1290 and 410 mAh/g at current density of 20 and 1000 mA/g, respectively. Electrochemical cycle test shows that the discharge capacity of 740 mAh/g can be obtained after 80 cycles at current density of 200 mA/g, with 78.06% capacity retention and almost 100% columbic efficiency. The electrochemical performances are much better than that of other MoO 2 -based materials. This could be assigned to the porous structure that increased contact areas between electrode materials and electrolytes, much faster electron transport confirmed via electrochemical impedance spectroscopy (EIS) analysis and Density functional theory (DFT) calculations.
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
APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
·
IF 8.328
Fenghui Liu,Jie Yu,Guangyuan Tu,Ling Qu,Jiacheng Xiao,Yongdi Liu,Lingzhi Wang,Juying Lei,Jinlong Zhang
In this study, carbon nitride was loaded into the titanium incorporated SBA-15 mesoporous silica (denoted as Ti-SBA15-CN) by a two-step vapor condensation of dicyandiamide. The as-prepared sample was characterized by various spectroscopy techniques. Photocatalytic reduction of Cr (VI) in aqueous solution was investigated using Ti-SBA15-CN under visible-light irradiation. By introducing Ti into the SBA-15 framework structure, the visible light driven photocatalytic activity of the obtained Ti-SBA15-CN was higher than SBA15-CN and the photocatalytic activity exhibited a rise with the increase of Ti contents. It was because the presence of Ti moiety could promote the separation of the photo-generated charge carriers in carbon nitride, leading to the enhancement of the photocatalytic activity. The addition of phenol further enhanced the photocatalytic reduction of Cr (VI). Similarly, the presence of Cr (VI) promoted the degradation of phenol. The synergistic effect between the reduction of Cr (VI) and the degradation of phenol provided salutary method for purification of the complex waste water and environmental restoration.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2021
·
IF 9.127
Wei Weng,Gaozhan Liu,Lin Shen,Xiayin Yao
The quaternary antimony (Sb)-based sulfide sodium solid electrolyte Na 11 Sn 2 SbS 12 with good moisture stability is attractive for practical application in all-solid-state sodium batteries . However, the Na 11 Sn 2 SbS 12 exhibits low room temperature ionic conductivity and it is difficult to obtain pure phase due to the limited solubility of Sb in the Na 11 Sn 2 SbS 12 crystal structure. Herein, titanium (Ti)-doping Na 11+ x Sn 2 Sb 1- x Ti x S 12 ( x = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.8, 1.0) materials are systematically investigated, and the highest room temperature ionic conductivity of 1.01 mS cm −1 is achieved when x = 0.5 (Na 11.5 Sn 2 Sb 0.5 Ti 0.5 S 12 ), which is 3 times higher than that of pristine Na 11 Sn 2 SbS 12 . X-ray diffraction and alternating current impedance analyses reveal that the substitution of Sb with Ti can prevent the formation of the NaSbS 2 impurity, determining high ionic conductivity. Meanwhile, the Na 11.5 Sn 2 Sb 0.5 Ti 0.5 S 12 demonstrates good air stability with limited H 2 S gas evolution. Besides, the activation energy , electronic conductivity and electrochemistry stability window for Na 11.5 Sn 2 Sb 0.5 Ti 0.5 S 12 are also evaluated. Moreover, a high reversible capacity and stable cyclic performance of TiS 2 based all-solid-state sodium battery using Na 11.5 Sn 2 Sb 0.5 Ti 0.5 S 12 are demonstrated, showing an initial discharge capacity of 177.6 mAh g −1 at 0.1C with a capacity retention of 83.5% based on the second discharge capacity after 50 cycles at 25 °C.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shuangchun Jiang,He Tao,Yingjuan Shao,Yao Fu,Wenqi Zhong
The pressurization can significantly enhance the thermochemical energy storage performance of Ca-based materials. In this study, detailed experimental investigations were conducted in both fixed bed and fluidized bed on the performance of TiO 2 modified Ca-based materials ranged from 700 °C to 900 °C under pressurized conditions (0.1 MPa to 0.8 MPa) from powder to pellet, including the influence of inert dopants on the properties of CaO powder, the optimization of biomass pore-former agents' selection and the enhancement of pressurized fluidization states on the performance of pelletized materials. The findings indicated that the pressure intensity has a positive correlation with the energy storage density and cyclic stability of TiO 2 modified Ca-based materials. The results demonstrated that the properties of CaO powder intensified with the pressure and the energy storage density was increased by 31.4 % with 5 % TiO 2 doped at 0.8 MPa. And the energy storage performance of the pelletized CaO-5TiO 2 with 10 % bagasse added was also significantly improved at a higher-pressure condition. The energy storage performance of the determined 10B-CaO-5TiO 2 pellet under fluidization conditions at 0.8 MPa was 38.9 % higher than that of atmospheric pressure after 10 cycles. As the carbonation pressure increased, the average grain size of CaO exhibited a decline of 7.0 %, a slighter sintering and deeper reaction region were observed into the determined pellet. Furthermore, the specific surface area and pore volumes of the 10B-CaO-5TiO 2 pellets under high carbonation pressure were 382.8 % and 460.0 % higher than that of atmospheric pressure in the fluidized bed, respectively.
研究领域:
材料科学
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能源化学
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化学工程
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多相催化
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储能技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 48
·2303924
·
IF 13.3
Taotao Zhou,Wenhao Tang,Junwen Lv,Yirui Deng,Qiang Liu,Lei Zhang,Ruiping Liu
Commercial polymer separators usually have limited porosity, poor electrolyte wettability, and poor thermal and mechanical stability, which can deteriorate the performance of battery, especially at high current densities. In this work, a functional polyethylene (PE) separator is prepared by surface engineering a layer of Ti-doped SiO 2 @Al 2 O 3 particles (denoted as ST@Al 2 O 3 -PE) with strong Lewis acid property and uniform porous structure on one side of the PE separator. On the other hand, ST@Al 2 O 3 particles with abundant pore structures and large cavities can store a large amount of electrolyte, providing a shortened pathway for lithium-ion transport, and the Lewis acid sites and porous structure of the ST@Al 2 O 3 can tune Li plating/stripping behavior and stabilize the lithium metal anode. The ST@Al 2 O 3 -PE separators exhibit better ionic conductivity (5.55 mS cm −1 ) and larger lithium-ion transference number (0.62). At a current density of 1 mA cm −2 , Li/Li symmetric cells with ST@Al 2 O 3 -PE separator can be stably cycled for more than 400 h, and both lithium iron phosphate /Li cells and lithium cobaltate/Li cells with ST@Al 2 O 3 -PE separator have good cycling and rate performance. This work provides a new strategy for developing functional separators and promoting the application of lithium metal batteries.
研究领域:
材料科学
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电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Pengfei Wang,Yanyan Li,Bo Fan,Bin Yang,Liangdong Lin,Chen Bao,Qinghai Ma,Gaofeng Li,Dianbo Ruan
A series of Ti-doped Na 3 V 2 (PO 4 ) 2 O 2 F materials were synthesized through a controlled coprecipitation method with precise Ti content regulation. Experimental results indicate that a 15 wt% Ti doping level (NVTOPF-0.15) optimally enhances electrochemical performance, yielding an initial discharge capacity of 119.3 mAh g −1 at 0.2C and retaining 84.3 % of its capacity after 2000 cycles at 5C. Titanium doping exerted a dual-functional effect: streamlining the synthesis pathway through synergistic coprecipitation with controllable particle size and enhancing the lattice substitution of Ti 4+ for V in VO 6 octahedra. This substitution refined the crystal structure and enhanced Na + diffusion kinetics. Titanium doping-induced structural reconstruction led to a reduction in particle size, thereby facilitating the electrochemical reaction kinetics. Additionally, using a combination of the Randles-Sevcik equation and theoretical calculations, it was found that titanium doping significantly increased the Na + diffusion coefficient and decreased the band gap. This study presents a dual-functional titanium-doping approach for high-rate and long-life sodium-ion cathode materials. The synthesis of NVTOPF via the co-precipitation method will provide new guidance for the development and application of positive electrode materials in sodium-ion batteries.
研究领域:
材料科学
·
电化学
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能源存储
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无机化学
·
固态化学
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纳米材料
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电池技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2020
·
IF 4.473
Fengkai Wu,Jiale Xie,Yue You,Zhengyu Zhao,Liuliu Wang,Xiaoying Chen,Pingping Yang,Yuelong Huang
The poor conductivity and sluggish kinetics of hematite (α-Fe2O3) limit its photoelectrochemical (PEC) performance. Herein, a cobalt metal–organic framework (Co-MOF) ultrathin overlayer is in situ-grown onto a Ti-doped hematite nanorod array via the chemical bath deposition. The optimal Co-MOF/Ti:Fe2O3 achieves a photocurrent density of 2.24 mA/cm2 at 1.23 V [vs reversible hydrogen electrode (RHE)], which is 2.4-folds that of pristine Fe2O3. When compared with the onset potential of Ti:Fe2O3, Co-MOF/Ti:Fe2O3 exhibits a cathodic shift of 310 mV. Co-MOF/Ti:Fe2O3 also shows a photocurrent density retention of 98.1% after the 6 h stability test. The improved PEC activity is mostly ascribed to the increased charge separation and surface charge injection. Ti doping increases the electron density in Fe2O3 and lowers the Fermi level (vs RHE), facilitating the charge transport in the bulk. The enhanced photovoltage and favorable distribution of surface states after Co-MOF modification and the catalytic/conductive properties of Co-MOF induce the enhanced charge separation/injection and the low onset potential.
研究领域:
材料科学
·
能源转换与存储
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2021
·Vol. 11
·期 1
·82
·
IF 4.146
Chuang Li,Dan Wang,Jiangli Gu,Yichun Liu,Xintong Zhang
Surface electron traps on semiconductor photoanodes mediate surface recombination and deteriorate the photoelectrochemical (PEC) water oxidation performance of the photoanode. Developing convenient methods to reduce surface electron traps is therefore essential for high efficiency PEC water oxidation on semiconductor photoanodes, particularly for nanostructured photoanodes with large surface area. Herein, we employ a O2plasma treatment to boost the PEC water oxidation performance of Ti-doped Fe2O3(Ti-Fe2O3) nanowires photoanodes, aiming to reduce surface oxygen vacancies, the dominant electron traps on Ti-Fe2O3surface. X-ray diffraction (XRD), scanning electron microscopy and spectroscopic analyses show that the oxygen plasma treatment changes the structural, morphological and optical properties negligibly, but it does reduce the content of surface oxygen vacancies, as estimated from O1s X-ray photoelectron spectroscopy spectra. An optimal O2plasma treatment (200 W, 70 s) increases the photocurrent density of the Ti-Fe2O3nanowire photoanode to 2.14 mA·cm−2(1.23 V vs. RHE) under air mass 1.5G simulated solar light, which is 1.95 times higher than the pristine Ti-Fe2O3nanowire photoanode. The surface hole transfer efficiency is also improved by 1.66 times due to the reduced surface recombination. The work suggests that O2plasma treatment is a convenient but effective method to boost the PEC water oxidation performance of Ti-Fe2O3photoanode and might be applicable to other semiconducting oxide photoanodes for high efficiency PEC water splitting.Keywords:photoelectrochemical water splitting;O2plasma treatment;surface oxygen vacancies;Ti-doped hematite nanowire arrays
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 49
·73935-73945
·
IF 5.19
Li Zhangjie,Chen Yongdong,Deng Jie,Luo Li,Gao Wenxiang,Yuan Liang
In this paper, we prepared a series of Ce 1- x Ti x O 2 ( x = 0–0.20) nanorods by hydrothermal method, which were used to construct the PdCu/Ce 1− x Ti x O 2 catalysts. The Ce 1− x Ti x O 2 and PdCu/Ce 1− x Ti x O 2 samples were characterized by transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), N 2 adsorption–desorption, X-ray diffraction (XRD), inductively coupled plasma optical emission spectrometer (ICP-OES), etc. Catalytic activity, stability, and repeatability of the catalysts for methanol oxidation were investigated. The results show that doping a proper amount of titanium could strengthen the interaction between Ce 1− x Ti x O 2 support and PdCu nanoalloy, thus increasing the oxygen vacancy concentration and promoting Pd species with a higher oxidation state. These modified properties are beneficial for the deep oxidation of methanol. The light-off temperature ( T 50 ) and full-conversion temperature ( T 90 ) of methanol over the PdCu/CeO 2 catalyst are 108 °C and 159 °C, respectively. The greatest activity improvement is found for PdCu/Ce 0.9 Ti 0.1 O 2 , which shows the lowest T 50 of 88 °C and T 90 of 138 °C. Furthermore, neither PdCu/CeO 2 nor the modified PdCu/CeO 2 catalyst produces by-products and exhibit excellent stability and repeatability throughout the whole test period. This study provides a reference for in-depth understanding and designing of efficient and stable CeO 2 -based oxidation catalysts. Graphical abstract
研究领域:
催化
·
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）