JOURNAL OF SUPERCRITICAL FLUIDS
·
2024
·
IF 3.4
Jianqiao Yang,Yining Ding,Fen Zhao,Shuzhong Wang,Yanhui Li,Donghai Xu
In this study, a Cr coating was fabricated on Ni-based alloys to prevent under-deposit corrosion. The effect of salt deposition on the structural integrity of the Cr coating in SCW environment with/without oxygen was investigated. Results show that the Cr coating kept its integrity after exposure in SCW environment, successfully avoided the metallic ions leaching from Ni-based alloys. The structure of the oxide layer after exposure is a thin Fe 2 O 3 or FeCr 2 O 4 layer and a Cr 2 O 3 layer. The oxidation rate of the Cr coating decreased to one third of the sample after exposure in the same environment without salt deposit layer, indicating that the inward mass-transfer of oxygen to the alloy surface was inhibited by the salt deposit layer. The volume expansion of the sample due to the growth of Cr oxide layer was restrained by the salt deposit layer, forming a growth stress in the coating.
研究领域:
材料科学
·
腐蚀科学
·
高温材料学
·
表面工程
·
能源材料
·
化学工程
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DOI
高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2023
·Vol. 53
·期 12
·2411-2419
·
IF 2.9
Mai Manfang,Liao Bin,Liao Yijun,Lin Donghai,Ma Xinzhou
GaTe thin films are electrochemically deposited on indium tin oxide for photoelectrochemical applications. The electrochemical deposition behavior of GaTe thin films in acidic solution of HTeO 2 + with Ga 3+ is studied with cyclic voltammetry combining with operando transmittance spectroscopy. Underpotential deposition of Ga on Te starts at potential of − 0.35 V. The presence of Ga 3+ in the solution can strongly suppressed the formation of H 2 Te. XPS analysis reveals that Ga-rich GaTe is deposited over a wide potential range. The photoelectrochemical performance of the thin films as photocathodes is strongly dependent on the deposition potential. The GaTe films deposited at − 1.0 V produced the highest photocurrent of about − 0.03 mA cm −2 . Meanwhile the film deposited at − 0.35 V shows improved performance during photoelectrochemical measurement, which can be ascribed to the increased GaTe content during photoelectrochemical measurements, as confirmed by XPS analysis. Graphical
研究领域:
材料科学
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电化学
·
半导体物理
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光电功能材料
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能源材料
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表面科学
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薄膜技术
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DOI
高影响因子
Small
·
2023
·Vol. 19
·期 24
·2207362
·
IF 13.3
Yaqiang Ji,Yuan Zhang,Jiaqi Zhu,Pai Geng,Jonathan E. Halpert,Liang Guo
Flexible pressure sensors play an indispensable role in flexible electronics. Microstructures on flexible electrodes have been proven to be effective in improving the sensitivity of pressure sensors. However, it remains a challenge to develop such microstructured flexible electrodes in a convenient way. Inspired by splashed particles from laser processing, herein, a method for customizing microstructured flexible electrodes by femtosecond laser-activated metal deposition is proposed. It takes advantage of the catalyzing particles scattered during femtosecond laser ablation and is particularly suitable for moldless, maskless, and low-cost fabrication of microstructured metal layers on polydimethylsiloxane (PDMS). Robust bonding at the PDMS/Cu interface is evidenced by the scotch tape test and the duration test over 10 000 bending cycles. Benefiting from the firm interface, the developed flexible capacitive pressure sensor with microstructured electrodes presents several conspicuous features, including a sensitivity (0.22 kPa −1 ) 73 times higher than the one using flat Cu electrodes, ultralow detection limit (<1 Pa), rapid response/recovery time (4.2/5.3 ms), and excellent stability. Moreover, the proposed method, inheriting the merits of laser direct writing, is capable of fabricating a pressure sensor array in a maskless manner for spatial pressure mapping.
研究领域:
生物医学工程
·
柔性电子学
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微纳加工
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传感器技术
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材料科学
✓ 已验证
DOI
高影响因子
Results in Physics
·
2023
·
IF 5.3
Meijie Zhu,Hua Xu,Zuoquan Tan,Le Wang
Large-area and uniform two-dimensional (2D) non-layered α-MnSe was successfully synthesized via the molecular sieve modified chemical vapor deposition (CVD). The molecular sieve serves both as a filter and a container to controllable release the Mn precursor in a stable and much lower concentration, leading to the uniform growth of 2D α-MnSe flakes. The thickness, crystalline quality and uniformity of the as-grown α-MnSe are further characterized. Our study validated the positive role of molecular sieve in the controllable growth of 2D α-MnSe, which is believed to be applicable to other non-layered transition metal chalcogenides (TMCs) and will be beneficial for their further applications in electronics, optoelectronics and spintronics.
研究领域:
材料科学
·
纳米科技
·
凝聚态物理
·
无机化学
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DOI
高影响因子
RUSSIAN JOURNAL OF ELECTROCHEMISTRY
·
2012
·Vol. 48
·期 11
·1135-1139
·
IF 0.534
Sun Xuping,Liao Fang,Lu Wenbo,Chang Guohui
In this paper, electrodeposition technique, in combination with well-established microfabrication techniques, is used for the first time herein to the controllable fabrication of novel Pd nanotextured micro-electrodes (NTMEs). This NTMES system is proven to be particularly powerful and versatile with two degrees of freedom: nanoscale control of electrode nanotexturing and the microscale control of the electrode size and shape.
研究领域:
生物医学工程
·
纳米医学
·
电化学传感
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微系统技术
·
分子诊断
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2016
·
IF 2.76
Hao Li,Sirong Yu,Xiangxiang Han,Yan Zhao
Superhydrophobic surface has attracted great attention because of its potential applications. In this work, a facile method for fabrication of a superhydrophobic coating on pipeline steel surface is reported. A hierarchical structured coating with nanoflakes was fabricated via electrodeposition and solution-immersion, and then the coating achieved superhydrophobic with water contact angle about 157° and sliding angle around 3° after fluorination modification. The surface morphology and wettability changed with different experimental parameters were also investigated. The prepared superhydrophobic coating exhibited efficient self-cleaning and anticorrosion properties. Furthermore, the anti-scaling property of this superhydrophobic coating was confirmed since the CaCO 3 crystals on the superhydrophobic coating were mainly needlelike compared to the rhombohedral CaCO 3 crystals on the surface of steel substrate. This superhydrophobic coating maintained good long-term stability in air, and mechanical and thermal stability under certain environment. This superhydrophobic coating provided potential multifunctional applications, such as self-cleaning, corrosion resistance and anti-scaling properties, of deposition metal or alloy coating.
研究领域:
材料科学
·
表面工程
·
腐蚀科学
·
功能涂层
·
金属防护
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DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 29
·11065-11072
·
IF 0
Qian Zhang,Ying Zhou,Fang Wang,Fan Dong,Wei Li,Haimin Li,Greta R. Patzke
Elemental photocatalysts have recently been proposed as interesting materials to be used as alternatives to conventional semiconductor compounds. In this study, we demonstrate that not only elements with semiconducting properties are photocatalytically active by introducing semimetallic bismuth for the photooxidation of NO. Black Bi films were prepared via an electrochemical deposition approach. Both density functional theory (DFT) calculations and temperature dependence electrical resistivity measurements pointed out that the obtained films exhibited semimetallic behavior. The Bi films were easily oxidized upon exposure to air. However, electrochemical reduction of the surface amorphous oxide layer led to a more than 4-fold enhancement of the photocurrent density of the Bi films. The detection of hydroxyl radicals with electron spin resonance (ESR) investigations further confirmed the photogeneration of electrons and holes. A 37.7% removal ratio of NO over Bi films was observed under UV light irradiation with no significant reduction of photocatalytic activity after five cycles. Given that the conduction and valence bands of semimetallic Bi overlap, the associated excitation processes are more complex in comparison with semiconductor photocatalysts, thereby indicating a different photocatalytic mechanism. The present study points out new directions for developing semimetallic photocatalysts.
研究领域:
材料科学
·
环境催化
·
物理化学
·
表面科学
·
无机功能材料
✓ 已验证
DOI
THIN SOLID FILMS
·
2013
·
IF 1.604
Shufang Wang,Shanshan Chen,Guoying Yan,Fuqiang Liu,Shouyu Dai,Jianglong Wang,Wei Yu,Guangsheng Fu
c-axis oriented nanocrystalline Bi 2 Sr 2 Co 2 O y thin films with the average grain size of 25 nm have been achieved by chemical solution deposition combined with a rapid annealing process in oxygen. The resistivity and Seebeck coefficient of the nanostructured films are about 7.0 mΩ·cm and 171 μV/K at 873 K, resulting in a power factor 2–3 times larger than that of the best reported value in the coarse-grained Bi 2 Sr 2 Co 2 O y polycrystalline bulks. Since the thermal conductivity can be greatly reduced due to the increased phonon scattering at the grain boundaries of nanocrystalline films as well as at film surface and at film/substrate interface, great improvements in the ZT are expected in the nanocrystalline Bi 2 Sr 2 Co 2 O y thin films .
研究领域:
材料科学
·
凝聚态物理
·
无机非金属材料
·
能源材料
✓ 已验证
DOI
高影响因子
JOURNAL OF SOILS AND SEDIMENTS
·
2016
·Vol. 17
·期 2
·536-542
·
IF 2.206
Zhang Jinyang,Li Chuxian,Wang Dingyong,Zhang Cheng,Liang Li,Zhou Xiong
Purpose The environmental safety of both nano-TiO 2 particles and mercury (Hg) pollution has been of widespread concern. Soils and sediments were the main receiving environments of nano-TiO 2 and Hg. There was a strong association between nano-TiO 2 with Hg compounds. Very limited research has been carried out on the impact of nano-TiO 2 on the environmental behavior of Hg in sediments. The objective of this study was to investigate the effects of nano-TiO 2 on the release and transformation of Hg in sediments. Materials and methods Two types of TiO 2 nanoparticles were employed. Sediment samples were collected in the water level fluctuating zone of the Three Gorges Reservoir, China. Sediment samples spiked with HgCl 2 solution were taken as Hg-contaminated sediments. The flooding experiments were conducted using capped borosilicate glass bottles containing 300 ml TiO 2 suspensions (0.2 g L −1 and 0.4 g L −1 ) and 30 g original or Hg-contaminated sediment samples outdoors. All experiments were conducted in triplicate. Water samples were collected at determined interval times over a 60-day period. Sediments were collected on the 60th day. Total Hg (THg) and methylmercury (MHg) in both water and sediment samples and Hg speciation just in sediment samples were determined. A series of control samples without TiO 2 addition were also prepared. Results and discussion The results showed that nano-TiO 2 particles at high content (4 g kg −1 ) promoted the release of Hg in sediments, and the anatase particles showed a stronger effect. Methyl Hg concentrations in waters of nano-TiO 2 treatments significantly decreased by the 10th day. The effect of nano-TiO 2 greatly depended on anatase and rutile particles. After that, methyl Hg concentrations had no significant difference between nano-TiO 2 treatments and the control, except 2 g kg −1 rutile treatment by the 20th day. The changes of Hg speciation in sediments demonstrated that nano-TiO 2 inhibited the transformation of Hg-bound organic matter into the oxidated state, especially upon 2 g kg −1 rutile treatment. This was consistent with the lower MHg concentrations in the 2 g kg −1 rutile treatment. Conclusions Both anatase and rutile nano-TiO 2 were found to affect the release of Hg in sediment. Nano-TiO 2 promoted THg release in sediments and posed an increased risk of Hg contamination in waters, especially for anatase particles. Moreover, nano-TiO 2 inhibited the methylation process of Hg in sediments at the initial stage of flooding and could affect the transformation of Hg speciation in sediments, especially for low-content rutile particles.
研究领域:
环境科学
·
地球化学
·
水体生态学
·
污染控制
·
环境毒理学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
M.Y. Gao,C. Yang,Q.B. Zhang,Y.W. Yu,Y.X. Hua,Y. Li,P. Dong
Porous Ni-Cu alloy films composed of nanosheets are directly fabricated on Cu substrate using a facile potentiostatic electrodeposition approach from a 1:2 choline chloride-ethylene glycol eutectic solvent (ethaline) containing nickel chloride and copper chloride. Electrochemical co-deposition of Ni-Cu alloy in ethaline is found to be thermodynamically favorable in comparison to conventional aqueous solutions. The deposition process occurs via an instantaneous nucleation and growth of nanoparticles at the initial stage and develops vertically to form nanoporous structures arrayed with nanosheets over deposition time . The as-prepared porous Ni-Cu alloy nanosheet arrays exhibit enhanced electrocatalytic activity for the hydrogen evolution reaction (HER) in alkaline media , which displays a small Tafel slope of 57.2 mV dec −1 with a low onset potential of −48 mV vs. RHE at an optimal condition. It requires small overpotentials of −128 and −150 mV to drive catalytic current densities of 10 and 20 mA cm −2 , respectively. This facile electrodeposition method performed in ethaline provides an efficient way to fabricate porous Ni-based alloy nanosheets directly on a current collector, which is a promising technology for the synthesis of earth-abundant HER electrocatalysts .
研究领域:
电催化
·
材料科学
·
能源化学
·
纳米材料
·
电化学
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DOI
高影响因子
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
·
2019
·Vol. 70
·期 6
·1044-1055
·
IF 1.458
Junwei Sheng,Xixun Shen,Yaxue Wang,Qunjie Xu,Xiaoxue Zhang
In this paper, the pure Zn coating and Zn-TiN composite coatings containing four different concentrations of TiN particles were prepared on the carbon steel by direct current electrodeposition. The X-ray diffraction and scanning electron microscopy were used to study the crystal size, preferred orientation, and surface morphology of these coatings. The results show that the incorporation of TiN particles refines the crystal size of the Zn coating and results in the formation of a special surface morphology with papillary-shaped clusters structure that preferentially grows along the (100) crystallographic plane. Such a surface provides better hydrophobicity for the Zn-TiN composite coatings. The corrosion behavior of these coatings was evaluated by potentiodynamic polarization, electrochemical impedance spectroscopy and the long-term immersion test. The results show that the incorporation of TiN nanoparticles leads to a significant increase in corrosion resistance of the Zn coating and there is an optimal addition of TiN nanoparticles to provide a best corrosion resistance for the composite coatings. Additionally, the microhardness of prepared coatings was also evaluated.
研究领域:
材料科学
·
表面工程
·
腐蚀与防护
·
金属功能涂层
·
电化学
✓ 已验证
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2019
·Vol. 31
·期 8
·2099-2102
·
IF 3.839
Xin Yu,Ding Wang,Yuqiu Wang,Ji Yan,Xianying Wang
In this work, the two-dimensional MoS 2 film was prepared by sulfuring the molybdenum atomic layer on SiO 2 /Si substrate. The reaction temperature, heating rate, holding time and carrier gas flow rate were investigated comprehensively. The quality of MoS 2 film was characterized by optical microscopy, atomic force microscopy, Raman and photoluminescence spectroscopy. The characterization results showed that the optimum synthesis parameters were heating rate of 25 °C/min, reaction temperature of 750 °C, holding time of 30 min and carrier gas velocity of 100 sccm. The MoS 2 gas sensor was fabricated and its gas sensing performance was tested. The test results indicated that the sensor had a good response to both reducing gas (NH 3 ) and oxidizing gas (NO 2 ) at room temperature. The sensitivity to 100 ppm of NO 2 was 31.3%, and the response/recovery times were 4 s and 5 s, respectively. In addition, the limit of detection could be as low as 1 ppm. This work helps us to develop low power and integrable room temperature NO 2 sensors.
研究领域:
材料科学
·
纳米科技
·
传感器技术
·
环境监测
·
半导体物理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）