ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Jingchun Liu,Kieran P. Dolan,Junxia Liu,Jianqiang Wang,Dewu Long
Dense carbon film coated on 316L stainless steel was achieved by electrochemical deposition in molten fluoride salt (LiF-NaF-KF 46.5–11.5-42.0 mol%, FLiNaK, m.p. 727K) using C 2 2- as the C source. The C 2 2- source was in-situ synthesized in the high temperature eutectic salt by adding mixed Ca/C powders. Results of cyclic voltammetry confirmed the formation of CaC 2 and the obtained C coated 316L samples demonstrate satisfactory electrochemical deposition via synthesized C 2 2- . SEM images show that a dense and tunable thickness of C film can be fabricated in this FLiNaK–Ca/C–CaC 2 system in the range of 2.0–6.0 μm by optimizing the deposition conditions such as concentrations of Ca/C, deposition potentials, temperatures and times. Characterizations of the as-prepared C film by Raman spectroscopy imply that deposited films are predominantly composed of low degree crystallization structures. The anti-corrosion behavior of this coated material was verified by potentiodynamic polarization . Compared to bare 316L material, corrosion rate suppression by a factor of more than 16 was determined for a 4.0 μm C coated 316L sample in 0.1M HCl+0.5M NaCl solution, indicating the coating provides extremely high anti-corrosion performance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
IONICS
·
2024
·
IF 2.4
Niu Hongkun,Wang Cong,Gao Bingliang,Tan Qi,Liu Zhiwei,An Ruifeng
In aluminum electrolysis cells, the emissions of perfluorocarbons (PFCs) are not only associated with the high-voltage anode effect (cell voltage > 8 V), but continuous emissions of PFCs have also been detected during cell voltage below 8 V, especially in high-amperage prebake cells. These PFCs are referred to as low-voltage anode effect PFCs (LVAE-PFCs). In this study, the influence of current density on the formation of fluorocarbon (CF x ) film was investigated on an industrial carbon anode with a bottom area of 50 cm 2 in a high-temperature see-through aluminum electrolysis cell operating at 940 °C. The formation of CF x films on localized areas of the anode under normal electrolysis conditions was confirmed through observations. The quantity of peeled CF x films and the value of the back electromotive force gradually increase with increasing current density. Simultaneously, the thermal decomposition of the CF x films results in the generation of PFCs. Under conditions of sufficient alumina concentration, the peeling of the CF x films contributes to a reduction in the cell voltage. X-ray photoelectron spectroscopy analysis revealed that regions with high current density on the carbon anode provide favorable conditions for the formation of CF x components with high resistance characteristics, inevitably leading to an increase in cell voltage.
研究领域:
材料科学
·
环境科学
·
电化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Yanhong Yin,Min Wen,Zhen Tong,Qinqi Zhan,Jun Chen,Xianbin Liu,Yesheng Li,Ziping Wu,Dionysios D. Dionysiou
Tungsten carbide (WC) particles-embedded carbon nanomaterials with ultrathin edges and high degree of graphitization are very favorable co-catalysts for Pt in electrochemical fields. Herein, WC-embedded graphite carbon films (WC@GCFs) were successfully fabricated as co-catalysts for hydrogen evolution reaction (HER) via an in-situ carbonization technique. The mass specific activity of the WC@GCFs loading Pt NPs is 278 mA mg −1 Pt and 277 mA mg −1 Pt under the overpotential of 48 and 52 mV, which is 1.3 and 1.45 times higher than those of the commercial Pt-C (212.8 mA mg −1 Pt and 191.4 mA mg −1 Pt). The WC@GCFs-Pt displays excellent high stability for HER in acidic and alkaline media even after 5000 potential cycles. As expected, the GCFs originated from the surface of WC can effectively prevent WC particles from agglomeration, which contributes to high catalytic activity and stability of WC. The in-situ formed GCFs possesses ultrathin edges (~5 carbon layers), high degree of graphitization, and some oxygen-containing function groups. Charges are easily transferred from Pt NPs to WC via the linked-GCFs, which contributes to the high HER activity of WC@GCFs-Pt. We believe this work can provide a more economical and efficient route for large-scale synthesis of graphite carbon films coated transition metal carbide as co-catalysts in electrochemical fields.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yanan Wang,Chengzhuang Su,Songru Wang,Hao Tang,Hailuo Liu,Dong Wang,Aimin Wu,Hao Huang
The high integration of electronic devices severely hinders heat dissipation, impacting intelligent system performance. This study fabricated Cr-incorporated amorphous carbon films on aluminum alloy heat sinks using pulsed bias arc ion plating to enhance thermal performance. Film morphology and composition were analyzed via transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The Cr content was precisely regulated by adjusting the Cr target current, which was set at 0 A, 20 A, 40 A, and 60 A, respectively, and the effect of the sp 2 /sp 3 hybridization ratio on thermal dissipation was investigated. Results showed that increased Cr content led to the formation of B1-CrC in the amorphous carbon matrix. Optimal thermal performance occurred at a Cr target current of 20 A, at which the Cr content reached 6.21 at.%, yielding an infrared emissivity of 0.67 and a thermal conductivity of 160.95 W·m −1 ·K −1 . LED lamps coated with the Cr/C film exhibited a surface temperature 9.7 °C lower than that of uncoated lamps, thereby demonstrating excellent heat dissipation. The study underscores the synergistic effect of radial thermal conductivity and infrared emissivity in improving heat sink efficiency under non-forced convection.
研究领域:
材料科学
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
ELECTROANALYSIS
·
2021
·Vol. 33
·期 10
·2252-2259
·
IF 3.223
Jilong Li,Yanhui Wang,Rushuo Li,Bowen Lu,Yungang Yuan,Hongwei Gao,Shiwei Song,Shuyu Zhou,Jianbing Zang
A self-modified film electrode consisting of homogeneous snowflake-shaped nanoparticles on the amorphous carbon substrate (HNAC) was prepared by low temperature carbonization of phenolic resin. Such a unique structure was beneficial to enhance the electroanalysis signal responds. Simultaneous detection of DA and UA was performed on the HNAC using differential pulse voltammetry (DPV) at pH 8 phosphate buffer. The well-defined oxidation peak potential separation reached 260 mV between DA and UA. Meanwhile, the detection limit of HNAC were 0.401 μM (DA) and 2.800 μM (UA).
研究领域:
分析化学
·
材料科学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 12
·期 1
·181-191
·
IF 6.119
Xin Wang,Guang-Lan Li,Zhong-Fa Lu,Shuo Cao,Ce Hao,Suli Wang,Gongquan Sun
Reversible oxygen catalysts with good catalytic performance and economic efficiency are urgently needed for the rapid development of metal–air batteries and reversible fuel cells. Herein, a metal-free N, S co-doped porous carbon thin film (NSCF) was coated in situ on carboxylic carbon nanotubes (CNT@NSCF) via a simple and scalable low temperature polymerization–high temperature pyrolysis strategy. By analyzing the surface structure of comparable carbon supports including ketjenblack, Vulcan XC-72 carbon, and activated carbon, it is found that the surface oxygen-containing functional groups of the support are the key factor to obtaining a uniform coating of NSCF with the formation of a large amount of efficient N, S active species. As a result, the optimal CNT@NSCF shows an excellent bifunctional oxygen catalytic activity with a narrow potential difference (ΔE = Ej = 10,OER − E1/2,ORR) value of 0.74 V, which is superior to that of Pt/C + RuO2 (0.75 V) and most metal-free carbon-based oxygen catalysts. Notably, the CNT@NSCF-based rechargeable Zn–air battery delivers a remarkable performance with a high open-circuit voltage and outstanding charge–discharge stability after 213 h, which fully demonstrates the promising practical application potential of the CNT@NSCF catalyst.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Kai Yang,Min Luo,Daotong Zhang,Chaozheng Liu,Zhao Li,Liangcai Wang,Weimin Chen,Xiaoyan Zhou
Porous carbon (PC) can effectively alleviate the typical self-stacking phenomenon of 2D MXene-based films as a spacer, and can easily customize their porous structure. Nevertheless, the contact between 3D PC and 2D MXene flakes is generally presented at a point-to-point form owing to the irregular shape of PC, leading to a low efficiency on electron delivery and stress concentration with a fragile characteristic in the resulting films. Herein, 1D carbon nanotube (CNT) was introduced to construct a highly conductive net structure, tightly anchoring PC on MXene flakes, thus ensuring fast electron delivery by increasing the contact area between MXene and PC. Additionally, the interwoven CNTs bridge the horizontal MXene flakes, making internal structure more integral, thereby enhancing the flexibility. Consequently, the Ti 3 C 2 T x (a typical MXene)/CNT/PC (TCP) film has an ability to bear a large scan rate of 1 V s −1 and shows a high areal specific capacitance of 364.8 mF cm −2 at 0.5 mA cm −2 which remains above 80% even at a high current density of 50 mA cm −2 . Furthermore, the fabricated flexible quasi-solid-state supercapacitor (SC) demonstrates a large areal energy density of 10.5 μ Wh cm −2 at 29.8 μ W cm −2 . This study provides a promising approach to overcome the poor flexibility of MXene/PC film without sacrificing the conductivity, meanwhile paving a way for the development of flexible SCs with large charge storage capacity and high rate capability.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Zi Ying,Yu Lv,Haixiang Song,Yujie Ma,Riming Chen,Metini Janyasupab,Lingyan Feng,Yuan Zhang
High efficient and durable catalysts are always needed to lower the kinetic barriers as well as prolong the service life associated with oxygen evolution reaction (OER). Herein, a sequential synthetic strategy is considered to prepare a hierarchical nanostructure , in which each component can be configured to achieve their full potential so that endows the resulting nanocatalyst a good overall performance. In order to realize this, well-organized cobalt oxide (Co 3 O 4 ) nanopillars are firstly grown onto ultrathin 1T-molybdenum sulfide (1T-MoS 2 ) to obtain high surface area electrocatalyst , providing electron transfer pathways and structural stability. After that, zeolitic imidazolate framework-67 (ZIF-67) derived carbonization film is further in situ deposited on the surface of nanopillars to generate plentiful active sites, thereby accelerating OER kinetics. Based on the combination of different components, the electron transfer capability, catalytic activity and durability are optimized and fully implemented. The obtained nanocatalyst (defined as 1T-MoS 2 /Co 3 O 4 /CN) exhibits the superior OER catalytic ability with the overpotential of 202 mV and Tafel slope of 57 mV·dec −1 at 10 mA·cm −2 in 0.1 M KOH, and good durability with a minor chronoamperometric decay of 9.15 % after 60,000 s of polarization.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Shouyi Sun,Xiaoyang Ma,Wei Song,Zhengmao Ding,Jinjin Li
Achieving the ultralow coefficient of friction (COF) is the goal pursued by the industrial field. In this work, the macroscopic superlubricity with a COF of 0.003 on the DLC film was achieved at an approximate temperature of 45–100 °C when it slid against the steel ball with the lubrication of polyethylene glycol monolaurate (PEGM). The superlubricity state was achieved in a mixed lubrication regime, mainly containing boundary lubrication and thin film lubrication. The friction action under high temperature facilitated the chemisorption of PEGM molecules on the friction pair to form the tribochemical films, providing a low shear strength under boundary lubrication. Meanwhile, the PEGM molecules could form an ordered layer and a liquid layer on the tribochemical films due to the strong polarity of PEGM molecules, which attained the thin film lubrication to reduce friction. Moreover, the friction promoted the in situ generation of carbonaceous sheets in the contact region, providing low shear strength and reducing COF under boundary lubrication. This finding provides insight into the superlubricity mechanism of DLC film and expands its engineering application in superlubricity technology.
研究领域:
材料科学
·
摩擦学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2019
·Vol. 15
·期 44
·1902819
·
IF 10.856
Xiaojun Ruan,Jiangjiang Luo,Rui Wang,Yanbo Yao,Jingjiao Guan,Tao Liu
A nanometer-thick carbon film with a highly ordered pattern structure is very useful in a variety of applications. However, its large-scale, high-throughput, and low-cost fabrication is still a great challenge. Herein, microcontact printing (µCP) and direct laser writing carbonization (DLWc) are combined to develop a novel method that enables ease of fabrication of nanometer-thick and regularly patterned carbon disk arrays (CDAs) and holey carbon films (HCFs) from a pyromellitic dianhydride-oxydianiline-based polyamic acid (PAA) solution. The effect of PAA concentration and pillar lattice structure of the polydimethyl siloxane stamp are systematically studied for their influence on the geometrical parameter, surface morphology, and chemical structure of the finally achieved CDAs and HCFs. Within the PAA concentration being investigated, the averaged thickness of CDAs and HCFs can be tailored in a range from a few tens to a few hundred of nanometers. The µCP+DLWc-enabled electrically conductive CDAs and HCFs possess the characteristics of ease-of-fabrication, nanometer-thickness, highly regular and controlled patterns and structures, and the ability to form on both hard and soft substrates, which imparts usefulness in electronics, photonics, energy storage, catalysis, tissue engineering, as well as physical, chemical, and bio-sensing applications.
研究领域:
材料科学
·
纳米科技
·
生物医学工程
·
表面化学
·
微纳加工
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xiumei Wu,Shu Yu,Yunping Li
Silicon oxycarbide (SiOC) films on C/C composite substrate were prepared by isothermal chemical vapor deposition (CVD) with hexamethyldisilazane (HMDSN) as precursor. The deposition rate, microstructure, composition and mechanical properties of films prepared at deposition temperature ranging from 1300 K to 1576 K were investigated in details. With increasing deposition temperature, deposition rate increased gradually and reached a maximum value of 42.9 μm/h at 1513 K and then decreased; concurrently, the surface morphology of SiOC film changed from a smooth-dense to a coarse cauliflower, and then into a needle-like granular morphology. The SiOC films were composed of dominant SiC and a few other phases at all temperatures. In addition, the contents of oxygen-enriched units SiO 3 C and SiO 2 increased with deposition temperature due to redistribution reaction of Si –O and Si –C bonds and oxidation . SiOC films prepared at 1373 K showed the highest hardness and elastic modulus for 28.8 GPa and 234.2 GPa, respectively. SiOC films also contained small amounts of Si 3 N 4 and SiCN at all conditions.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Lei Wang,Xiao-Jun Liu,Jie Hao,Li-Qiang Chu
A rapid and simple approach to prepare the dielectric buffer layers is of crucial importance for the development of long-range surface plasmon resonance (LRSPR) sensors. In this regard, we describe for the first time the use of plasma polymerized fluorocarbon thin films as the dielectric buffer layers for the construction of LRSPR sensors. The fluorocarbon films were achieved by radio frequency plasma polymerization of perfluorooctyl ethylene (PFOE) at continuous wave mode with an input power of 60 Watts. The resulting ppPFOE exhibited good adhesion with both the glass substrate and the gold superstrate, and also remained relatively stable in aqueous solutions as seen by optical waveguide spectroscopy (OWS). The obtained LRSPR sensor consisting of a SF11-ppPFOE-Au structure was employed for the detection of both the bulk refractive index variation and the protein adsorption .
研究领域:
生物传感
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）