Coatings
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2023
·Vol. 13
·期 7
·1266
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IF 3.4
Qian Kou,Weiliang Jin,Chuntao Ge,Jie Pang,Jun Zhang,Geir Martin Haarberg,Saijun Xiao,Ping Wang
In this paper, electrodeposition of a molybdenum coating was conducted in Na3AlF6-NaF-Al2O3-MoO3molten salts at 930 °C to investigate the availability of preparation of thick molybdenum coatings. The effects of current density and electrodeposition time on the morphology of the produced molybdenum coating were studied. With the increase of current density (10~70 mA·cm−2), the coating thickness was increased from 10 μm to 30 μm, with all the current efficiency above 97%. Under a current density of 30 mA/cm2, with the rise of electrodeposition time (10~60 min), three stages of the deposit growth were observed, including the formation of a large number of fine crystals, transformation into fibrous morphology and well-developed faceted grains. The formation of a large number of fine crystals at the initial stage of the electrodeposition could facilitate electroplating molybdenum coatings with good quality at higher current density and longer duration. Thus electrodeposition at a current density of 100 mA·cm−2for 3 h has been performed, resulting in the preparation of relatively flat, dense, and coherent molybdenum coatings with a thickness of 140 μm on a nickel substrate, with a current efficiency above 85%. It is anticipated that the electrodeposition of molybdenum coatings in the present molten system is suitable for electroplating thick molybdenum coatings.Keywords:cryolite-based molten salt;electrodeposition;molybdenum coating;nickel substrate
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2024
·
IF 2.3
Sun Xingjie,Zhang Wei-chao,Umar Ahmad,Wu Xiang
Bimetallic/polymetallic cobaltite possesses abundant redox reactions, high conductivity and theoretical capacity. This feature makes them a research focus of electrode materials for capacitor. In this study, we synthesize ZnCo 2 S 4 nanowires grown uniformly on Ni substrate through a controllable two-step hydrothermal strategy. The synthesized samples are used as cathode materials. The assembled supercapacitor delivers a specific capacitance of 81.66 C g −1 at a current density of 0.5 A g −1 . It keeps 73% of the initial capacitance after 15000 times cycling and an energy density of 85 Wh kg −1 at 2970 W kg −1 . These properties indicate their potential applications in future portable micro/nano and high-performance electrochemical devices. Graphical Abstract In this study, we synthesize ZnCo 2 S 4 nanowires grown uniformly on Ni substrate through a controllable two-step hydrothermal strategy. The assembled supercapacitor delivers a specific capacitance of 81.66 C g −1 at a current density of 0.5 A g −1 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Zhengwei Song,Lifeng Ding,Shengjian Zhang,Siyang Zhao,Lu Zuo
Superhydrophobic (SH) coatings have great potential to protect metals by reducing the contact area between metals and corrosive media. However, the poor mechanical stability of SH coatings restricts their potential applications. In this study, a nickel underlayer with a multi-hierarchical structure was deposited on the substrate using two-step electroplating in a nickel-plating bath. Finally, the SH coating was obtained by electrodeposition in an octamethyltrisiloxane solution. The morphology, composition, hydrophobicity, and corrosion resistance of SH coating were characterized using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), contact angle measurement, and electrochemical workstation. The prepared coating, with a water contact angle (WCA) of 157.5 ± 0.5° and a sliding angle (SA) of 4.3 ± 0.4°, exhibited excellent hydrophobicity due to the multi-hierarchical rough structure and low surface energy of the coating. The porous structure of the coating allowed its hydrophobic properties to be maintained even after 240 cm of sandpaper abrasion testing. After 20 days of immersion in 3.5 wt% NaCl solution, the coating still exhibited excellent corrosion resistance ( i corr ∼ 1.01 × 10 −8 A⋅cm −2 ) and hydrophobic properties (∼ 148.5 ± 0.5°), providing long-lasting protection to the substrate and prolonging its lifespan. This study introduces a strategy for preparing long-term corrosion-resistant SH coating on metallic surfaces.
研究领域:
材料科学
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腐蚀与防护
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表面工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 17
·6553-6558
·
IF 6.482
Jin-Cheng Shu,Si-Qi Zhu,Wen-Qiang Cao,Mao-Sheng Cao
A multi-functional electromagnetic (EM) device is an important pillar for promoting the progress of an intelligent society. Herein, a ZIF-67 nanoneedle array assembled on a nickel substrate is used as a precursor to construct a C/Co3O4 nanoarray via a simple thermal treatment approach, integrating the two functions of EM and thermal shielding. Its unique three-dimensional porous structure and integrated components endow this material with an average shielding efficiency of 99.62% and a maximum temperature difference of about 25 K. In addition, this skeleton structure features light weight, low density and small cost, which can be utilized to construct wearable devices to protect human beings from EM and thermal radiation. This study furnishes a novel horizon for the design and construction of multi-functional and wearable EM devices, and promotes the development of the EM field and the progress of multi-disciplinary technologies.
研究领域:
材料科学
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电磁学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiemin Han,Yifei Ma,Mei Wang,Zhaomin Tong,Jonghwan Suhr,Liantuan Xiao,Suotang Jia,Xuyuan Chen
Black coatings benefit from low reflectance or high light absorption are utilized in multifarious optical applications. Due to their unique three-dimensional nanostructure and π-band optical transitions, vertical graphene (VG) has drawn great attention to the field of black coatings. However, how the morphology of VGs affects reflectance has not been comprehensively disclosed yet. In addition, the morphology of the substrate for VG growth also affects the absorption properties. Here, we report a nano-and micro-engineered VG/Ni structure based on VG and laser-modified nickel foil, which possesses omnidirectional low reflectance of ∼0.25% over the visible range. A larger spacing of graphene nanowalls is more conducive to the formation of light traps and improves the absorption property. Besides, the surface of nickel substrate by laser irradiation presents a “cauliflower-like” microstructure, which further enhances light-trapping ability.
研究领域:
材料科学
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光学工程
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纳米技术
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表面工程
·
功能涂层
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Ze Yang,Yuanyu Chen,Qianghui Tian,Haixia Zhang,Ying Hou,Junjie Guo
The design and synthesis of hollow porous heterostructures from multiple components is expected to impart excellent properties to the electrochemically active materials owing to their high internal voids, high surface area, and high pore volume , which are beneficial for electrolyte infiltration. However, the development of optimized electrode materials for hollow porous heterostructure storage fell behind expectations. To address these challenges, we prepared a CuCo 2 S 4 @MnO 2 composite on a foam nickel substrate to create a hollow porous heterostructure. The optimized composite possesses high areal capacitance of 14.9 F cm −2 (or a specific capacitance of 1643 F g −1 ) at 3 mA cm −2 , and 83.4% capacitance retention after 30,000 cycles in a three-electrode configuration. The NF@CuCo 2 S 4 @MnO 2 //AC asymmetric supercapacitor can achieve high energy density (1.2 mWh cm −2 ) and power density (2.4 mW cm −2 ) due to the wide cell voltage in aqueous electrolyte and high particular capacitances from both CuCo 2 S 4 and MnO 2 improved by the hollow porous heterostructure. Furthermore, the NF@CuCo 2 S 4 @MnO 2 //AC ASC can light up an LED display screen. Overall, this work demonstrates the great potential and broad prospects for application in energy storage of hollow porous heterostructures.
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
Nanoscale
·
2025
·
IF 5.1
Runxin Li,Yangyang Dong,Heng Xu,Yifei Yuan,Jie Xu
High-valent metal single atoms generally exhibit exceptional electrocatalytic activity because of their rapid electron-transfer kinetics. However, their synthesis remains a formidable challenge owing to intrinsic instability under typical preparation conditions. Herein, atomically dispersed Ir3+ single atoms were successfully stabilized on a NiS2 matrix via a substitutional replacement of Ni lattice sites by Ir, followed by coordination with adjacent S atoms. The resulting catalyst delivers outstanding oxygen evolution reaction (OER) performance, achieving a current density of 10 mA cm−2 at an overpotential of only 190 mV. Density-functional theory calculations reveal that the high oxidation state of Ir upshifts the Ni d-band center toward the Fermi level, thereby strengthening OOH* adsorption and accelerating the OER kinetics. This work not only provides a robust strategy for constructing high-valent single-atom catalysts but also highlights the pivotal role of sulfide supports in stabilizing high oxidation states for advanced electrocatalysis.
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 32
·21106-21113
·
IF 10.7
Minghui Cui,Yansong Zhou,Rongjing Guo,Wenqi Zhao,Yanjing Liu,Qiongrong Ou,Shuyu Zhang
Electrolytic water splitting using renewable energy sources, such as solar power, provides a green and sustainable approach for hydrogen production. Anion exchange membrane (AEM) electrolyzers present substantial commercial prospects; however, the rate of hydrogen evolution reaction (HER) in alkaline electrolytes is limited by the water dissociation step. In this work, we fabricated an N-doped Ni substrate for loading ultrafine Pt nanoparticles, realizing spatial decoupling of the reaction process to break the limitation of water dissociation, where the N-doped Ni substrate and Pt nanoparticles facilitate the supply of ample H* and H2 release, respectively. The prepared Pt–N–Ni/NC with extremely low Pt loading (1.0 wt%) requires only 15 and 149 mV overpotentials to reach current densities of 10 and 1000 mA cm−2, respectively. When assembled into an AEM electrolyzer, the system requires a cell voltage of only 1.75 V to achieve a current density of 1000 mA cm−2. Notably, the solar-driven AEM electrolyzer demonstrates a current density of 1390 mA cm−2 with a solar-to-hydrogen efficiency (STH) of 8.27%. This study proposes a strategy to achieve efficient utilization and performance improvement of precious metals, promoting the development of efficient green hydrogen production.
研究领域:
材料科学
·
可再生能源
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Kejun Liao,Lisha Xie,Yuying Cui,Shurong Wang,Chengbo Li,Aili Wang,Xiaoyu Deng,Yong Xiang,Liming Ding,Feng Hao
Crystal orientation of perovskite film and interface modification plays an important role in the efficient operation and stability of perovskite solar cells (PSC). Herein, a high quality perovskite film with large grain size, high crystallinity and preferred crystal orientation on (100) plane is deposited on an aqueous solvent (H 2 O and DMF) pretreated nickel oxide (NiO x ) substrate (HDP). The aqueous solvent treatment increases the wettability and conductivity of NiO x layer during perovskite growth. Steady-state and time-resolved photoluminescences reveals a significantly increased charge extraction efficiency in the HDP perovskite films. In addition, the HDP devices exhibit impressively improved photovoltaic performance as well as enhanced long-term stability under high moisture, UV irradiation and thermal stress. Therefore, our work provides a versatile strategy to introduce preferred orientation and interfacial modification to enhance the crystal quality and stability of halide perovskite thin films and related optoelectronic devices.
研究领域:
材料科学
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能源技术
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纳米技术
·
固体物理
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）