CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Xuelu Wei,Laishi Li,Feng Liu,Limin Fan,Yusheng Wu
Ti 2 GaC is a novel ternary layered ceramic with unique physical and chemical properties such as excellent thermal conductivity , low density, high-temperature oxidation resistance , and corrosion resistance . However, the relatively low strength and hardness of Ti 2 GaC hinder its practical applications as a structural component. To strengthen the mechanical properties of Ti 2 GaC and extend its application range, in this study, (Ti 1-x V x ) 2 GaC MAX phase solid solutions with x ranging up to 0.25 were successfully synthesized using a two-step sintering method. (Ti 1-x V x ) 2 GaC solid solutions grains showed a typical lamellar structure , where the a lattice constant of (Ti 1-x V x ) 2 GaC decreased from 3.0660 to 3.0326 Å and c decreased from 13.3223 to 13.1520 Å. The effects of V content on the solid solution microstructure, crystal structure, mechanical strength, and resistance to friction and wear were evaluated in detail. In addition, the solid solution formation mechanism and fracture damage modes of these materials were discussed. The crystal structure, mechanical properties, electronic properties, and chemical bonding of (Ti 1-x V x ) 2 GaC continuous solid solution at x = 0–1 were calculated by DFT. The solid solution enhancement mechanism of (Ti 1-x V x ) 2 GaC was explained by analyzing the relationship between the structure and properties.
研究领域:
材料科学
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机械工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2013
·
IF 1.789
Juan Liu,Wenbin Guo,Fengdong Qu,Caihui Feng,Chao Li,Linghui Zhu,Jingran Zhou,Shengping Ruan,Weiyou Chen
Pristine and vanadium-doped In 2 O 3 nanofibers were fabricated by electrospinning and their sensing properties to H 2 S gas were studied. X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to investigate the inner structure and the surface morphology . The H 2 S-sensing performances were characterized at different temperatures ranging from 50 to 170 °C. The sensor based on 6 mol% V-doped In 2 O 3 nanofibers exhibit the highest response, i.e. 13.9–50 ppm H 2 S at the relatively low temperature of 90 °C. In addition, the fast response (15 s) and recovery (18 s) time, and good selectivity were observed.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Peng Zhou,Xingshuai Lv,Yugang Gao,Zhong Liang,Yuanyuan Liu,Zeyan Wang,Peng Wang,Zhaoke Zheng,Ying Dai,Baibiao Huang
Recently, Ni x Mo y N materials attach much attention in the field of electrocatalytic hydrogen evolution due to their good performance and high stability. However, most of the reports on Ni x Mo y N materials are Ni 0·2 Mo 0·8 N, and there are few reports on Ni 2 Mo 3 N. In fact, as one member of the Ni x Mo y N materials, Ni 2 Mo 3 N also has rich electronic properties and high electrical conductivity. Herein, we report the novel Ni 2 Mo 3 N and compare it to the traditional Ni 0·2 Mo 0.8 N. The results show that the Ni 2 Mo 3 N exhibits better performance than the Ni 0·2 Mo 0·8 N which means that it has great research potential in the field of hydrogen evolution. In order to further improve its catalytic performance, we regulate its electronic structure by V doping (V–Ni 2 Mo 3 N). The V–Ni 2 Mo 3 N material exhibits lower overpotential (54 mV at 10 mA cm −2 ) and outstanding stability. According to the theoretical calculation, the reason why the material exhibits superior performance is that V doping optimizes the chemical adsorption and bonding ability of the material to water molecule and reaction intermediate H, improves the electrical conductivity of the material.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 103
·期 3
·799-806
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IF 2.606
Wang Haishan,Ling Fuxin,Li Yule,Wu Dingzhang,Qi Longfei,Liang Zhaowei,Chen Qingming,Zhang Hui
La 0.825 Sr 0.175 Mn 1− x V x O 3 ( x = 0.00–0.05) ceramics were prepared by sol–gel method. X-ray diffraction analysis illustrates that all samples are perovskite structure, no impurity phases were detected. SEM shows that the grains are closely connected. With increasing V doping level, the grain size decreased from 27.78 μm ( x = 0.00) to 11.23 μm ( x = 0.05), which results into the enhancement of grain boundary effect. The temperature dependence of resistivity shows that all samples exhibit typical insulator-metal transition. With V doping up to 0.01, temperature coefficient of resistivity ( TCR ) increases from 4.65% K −1 to 6.1% K −1 , and the magnetoresistance ( MR ) value reaches 38.629%. The electrical and the magnetic properties of V-doped La 0.825 Sr 0.175 MnO 3 present a complicated behavior with further doping of V. These findings indicate that the properties of manganites can be effectively and dramatically tailored by doping of Mn, which meantime facilitate the application of manganites in infrared detector and magnetic sensors.
Graphical abstract
研究领域:
材料科学
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凝聚态物理
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产品关联
DOI
高影响因子
Materials Today Physics
·
2022
·
IF 11.021
Haipeng Wang,Fei Zhang,Mengmeng Jin,Donglin Zhao,Xiaoya Fan,Zerong Li,Yongsong Luo,Dongdong Zheng,Tingshuai Li,Yan Wang,Binwu Ying,Shengjun Sun,Qian Liu,Xijun Liu,Xuping Sun
Electrocatalytic nitrite (NO 2 − ) reduction to ammonia (NH 3 ) has been an attractive topic, which not only removes NO 2 − pollutants existing in surface water and underground water but also synthesizes value-added NH 3 . Nevertheless, the inactive kinetics for direct six-electron NO 2 − -to-NH 3 conversion makes it challenging to explore efficient electrocatalysts for the NO 2 − reduction reaction (NO 2 RR). Herein, we report a V-doped TiO 2 nanobelt array on a titanium plate (V–TiO 2 /TP) as a highly efficient NO 2 RR electrocatalyst. The experimental results and theoretical calculations clarify that V doping can enhance the intrinsic electrical conductivity and effectively optimize the free energy of the TiO 2 (101) crystal plane in the potential determining step, resulting in a positive effect on electrochemical NO 2 RR to NH 3 . The designed V–TiO 2 /TP exhibits an outstanding electrochemical NO 2 RR property with a high NH 3 yield of 540.8 μmol h −1 cm −2 at −0.7 V and an excellent Faradaic efficiency of 93.2% at −0.6 V versus reversible hydrogen electrode, superior to TiO 2 /TP.
研究领域:
材料科学
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环境科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2023
·
IF 4.5
Chunhong Gao,Jinjia Liu,Meilin Jia,Gala Sa,Aiju Xu
Photocatalytic technology has broad prospects in the degradation of organic pollutants due to its green, energy-saving and high-efficiency characteristics. In this study, TiO 2 and V–TiO 2 were prepared by hydrothermal method , and the catalysts were tested by experimental and theoretical calculations under a 400 W metal halide lamp degradation efficiency for aniline (30 mg/L). The synthetic photocatalysts were characterized by XRD , HRTEM , FT-IR, XPS , UV–Vis DRS , PL , EIS , and photocurrent , the results showed that the edges of the V-doped TiO 2 absorption band were redshifted, the band gap value were reduced, the photocatalytic activity were improved, and the PL showed e − /h + had the lowest composite rate for 1.5 mol%V–TiO 2 and broadens the optical response range. 1.5 mol% V was the optimal value for photodegrading aniline, and moderate V modification can significantly inhibit the complexation of e − /h + pairs. Finally, stability measurements performed over 5 cycles show that 1.5 mol%V–TiO 2 has excellent stability. The calculation results show that the optical band gap of V–TiO 2 were significantly reduced, the photocatalytic performance of V–TiO 2 were greatly enhanced.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 35
·18872-18880
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IF 11.9
Ningyun Hong,Jianwei Li,Shihong Guo,Huawei Han,Haoji Wang,Xinyu Hu,Jiangnan Huang,Baichao Zhang,Fang Hua,Bai Song,Nesrin Bugday,Sedat Yasar,Serdar Altin,Wentao Deng,Guoqiang Zou,Hongshuai Hou,Zhen Long,Xiaobo Ji
O3-type NaNi1/3Fe1/3Mn1/3O2 (NFM) is one of the most representative cathode materials with low cost and high capacity advantages. However, the sluggish diffusion kinetics and severe cathode–electrolyte interfacial reaction are serious roadblocks to commercialization. Hereby, a novel method of in situ V-modification is well-designed to play dual roles in reconstructing the crystal lattice and interface structure. Notably, the broadened layer spacing of O–Na–O and shortened TM–O bond are attributed to successful doping of V5+ into the bulk, accelerating the transmission of sodium ions and improving the structure stability. Concomitantly, the construction of a thin surface coating layer is beneficial for mitigating volume expansion and inhibiting structural degradation, which is validated by in situ X-ray diffraction coupled with the synchrotron X-ray absorption spectroscopy. Consequently, the rationally designed V-modified NFM cathode exhibits excellent cycling performances, exhibiting great capacity retention of 75.8% after 500 cycles at 2C in a half cell, and 85.6% capacity retention is observed after 150 cycles at 1C in the full cell. This work provides new insights into the development of O3-type layered oxide cathodes toward long-cycle life applications for large-scale energy storage systems.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Lan Wang,Ning Gong,Zhou Zhou,Wenchao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
Developing highly efficient, durable and noble-metal-free electrocatalysts for hydrogen evolution reaction (HER) in a wide pH range is the key to achieve sustainable energy cycle. Modulating the electronic characteristics of catalysts is of great important to enhance their electrocatalytic performance. Herein, we successfully design a self-supported multi-element transition metal phosphide (V-CoP/Ni 2 P/NF) electrocatalyst by V-doping and interface engineering. According to DFT calculations, V dopants and the synergistic effect between CoP and Ni 2 P can bring optimal hydrogen/water adsorption free energies . Meanwhile, the 3D cross-linked network structure could expose abundant active sites and facilitate ions diffusion/electron transfer. As a result, the V-CoP/Ni 2 P/NF catalysts exhibit superior electrocatalytic activities with extremely low overpotentials of 20, 58 and 79 mV to deliver a current density of 10 mA cm −2 for HER in alkaline, neutral and acidic electrolytes, respectively. Moreover, they also display outstanding long-term stability. This electronic modulation strategy provides a promising pathway for energy-related catalysis processes.
研究领域:
材料科学
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电化学
·
能源催化
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2022
·
IF 4.132
Xuhe Zhan,Feiyu Gao,Qianyu Zhuang,Yani Zhang,Jie Dang
In this work, a two-dimensional porous structure of a V-doped NiO film with excellent electrochromic properties on an ITO substrate was synthesized by a hydrothermal method. The influence of V5+ ions on the NiO film was explored by adjusting the amount of V doping, including refining the crystal grains, increasing the specific surface area of the film, and accelerating the diffusion rate of OH– in the film. Compared with the undoped NiO film, a 3 atom % V-doped NiO film comes out with superior electrochromic properties with large optical transmittance modulation (81.9% at 600 nm), fast response times (1.2 and 0.9 s), and excellent cycle stability (90.6%). This work creates innovation direction in the field of intelligent energy-saving window materials with high electrochromic properties.
研究领域:
材料科学
·
能源材料
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 36
·18877-18888
·
IF 14.511
Guanying Song,Siqi Luo,Qing Zhou,Jiachen Zou,Yusheng Lin,Lei Wang,Guicun Li,Alan Meng,Zhenjiang Li
Exploring the integration regulation strategies to boost the electrocatalytic performance and elucidating the manipulation mechanism are critical for the hydrogen economy. Herein, heteroatom doping and heterojunction strategies were integrated to engineer a V-Ni3FeN/Ni@N-GTs bifunctional electrocatalyst, where the V-Ni3FeN/Ni heterojunction consisting of V doped Ni3FeN and Ni was anchored on N-doped graphene nanotubes (N-GTs). Benefiting from the modulation of the d-band center of hosts Ni and Fe by V doping and the regulation of local charge distribution induced by the V-Ni3FeN/Ni heterojunction, combined with the introduction of the conductive N-GTs skeleton, V-Ni3FeN/Ni@N-GTs delivers overpotentials of 66 and 252 mV at 10 mA cm−2 for the HER and OER, respectively. Besides, when it is used as a bifunctional electrocatalyst for overall water splitting, a low cell voltage of 1.55 V is needed to achieve a current density of 10 mA cm−2. This work provides new inspiration for developing other promising electrocatalysts based on the integration of various strategies.
研究领域:
材料科学
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电化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Shaopei Jia,Yanfeng Gao,Xiaofei Ma,Yunfei Cao,Quan Huang,Qian Zhang,Zhixin Wang,Yanjie Wang,Yuanyuan Li,Dan Li,Renkai Chang,Yunchao Mu
Designing and synthesizing highly efficient and stable electrocatalysts of seawater electrolysis for the hydrogen evolution reaction is important for realizing green hydrogen production. Herein, a heterostructured V-doped Co2P anchored on N–P-doped three-dimensional covalently cross-linked graphene (V–Co2P@NPPC/3DG) electrocatalysts was synthesized with the help of V-doped ZIF-67 as an intermediate and a controlled phosphidation process. The as-prepared V–Co2P@NPPC/3DG-1:5 had low overpotentials of 98.3 and 88.3 mV (at 10 mA cm–2) in alkaline water and artificial seawater, respectively, and the corresponding Tafel slopes were 56.4 and 51.0 mV dec–1. The electrolyzer with a flowing alkaline artificial seawater assembled from V–Co2P@NPPC/3DG-1:5 with a commercial RuO2 catalyst exhibited a cell voltage of 1.54 V at 10 mA cm–2, which is close to that of Pt/C||RuO2 (1.52 V). Notably, the cell voltage of V–Co2P@NPPC/3DG-1:5||RuO2 was lower than that of Pt/C||RuO2 at a high current density (>58 mA cm–2), which exhibited superior stability. V doping effectively enhanced the intrinsic activity of Co2P, and the complexation with NPPC/3DG achieved full exposure of the active sites while enhancing the charge transfer rate during HER. This work will attract attention to the role of metal compound-carbon support interactions in enhancing the intrinsic activity, conductivity, and stability of electrocatalysts.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 22
·7447-7456
·
IF 4
Qian Chen,Jianfeng Huang,Ting Xiao,Liyun Cao,Dinghan Liu,Xiaoyi Li,Mengfan Niu,Guoting Xu,Koji Kajiyoshi,Liangliang Feng
Exploring low-cost and highly active photocatalysts with noble metal-free cocatalysts is of great significance for photocatalytic hydrogen evolution under simulated sunlight irradiation. In this work, a novel V-doped Ni2P nanoparticle loaded g-C3N4 nanosheet is reported as a highly efficient photocatalyst for H2 evolution under visible light irradiation. The results demonstrate that the optimized 7.8 wt% V-Ni2P/g-C3N4 photocatalyst exhibits a high hydrogen evolution rate of 271.5 μmol g−1 h−1, which is comparable to that of the 1 wt% Pt/g-C3N4 photocatalyst (279 μmol g−1 h−1), and shows favorable hydrogen evolution stability for five successive runs within 20 h. The remarkable photocatalytic hydrogen evolution performance of V-Ni2P/g-C3N4 is mainly due to the enhanced visible light absorption ability, the facilitated separation of photo-generated electron–hole pairs, the prolonged lifetime of photo-generated carriers and the fast transmission ability of electrons.
研究领域:
材料科学
·
能源化学
✓ 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）