JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Baosong Li,Dandan Li,Jun Zhang,Wei Chen,Weiwei Zhang
The incorporation of TiN and Y 2 O 3 nanoparticles together into Ni-W matrix have been investigated by pulse electrodeposition in present study. The microstructural, surface properties and corrosion resistance of Ni-W/TiN-Y 2 O 3 nanocrystalline coating have been studied. It illustrated that the electrodeposited coatings have dense and nodular structure without defects. Results confirmed that TiN and Y 2 O 3 particles were uniformly embedded in the composites. The embedded particles could improve the hardness and anti-corrosion properties of the obtained coating. The crystallite size calculated based on the preferred orientation (111) plane was of 14–17 nm, illustrating the formation of nanocrystalline structure. The mean R a value was about 84.6 nm. Electrochemical impedance tests revealed that the preferred combination of operating parameters for optimum corrosion resistance was 70%, 1000 Hz, 40 min and 4 A dm −2 . However, the best hardness and anti-wear properties were obtained at parameters of 50%, 500 Hz, 6 Adm −2 and 60 min. The extreme values of hardness and corrosion resistance were not realized simultaneously. The operating parameters should be kept in a certain balance to avoid the formation of inferior properties in any aspects of the coating; then the other performance advantages could be brought into full play. The preferred combination of operating parameters was optimized to be duty cycle of 70%, frequency of 1000 Hz, duration time of 40 min and average current density of 4 Adm −2 , which enabled the electrodeposited coating optimum corrosion resistance and high mechanical properties .
研究领域:
材料科学
·
电化学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 10
·105533
·
IF 1.449
Yaping Li,Guanjie Yan,Liming Luo,Long Wang,Shican Dai,Yuting Yang,Hanhui Liu,Yue Liu,Mingliang Yuan
An ultrathin Y2O3 layer is applied to improve the unsatisfactory cyclability and rate performance of LiNi0.4Co0.2Mn0.4O2 (NCM) cathodes for the first time. X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were implemented to characterize the physical performance of synthetical materials. In addition, charge-discharge cycling, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements were executed to investigate the electrochemical actions. In particular, the 0.5 wt% Y2O3-coated NCM manifests a significantly upgraded initial specific capacity of 185.4 mAh g−1 at 1 C and a capacity retention as high as 93.7% after 100 cycles. Nevertheless, bare NCM manifests a capacity retention of 59.4%. Even at 5 C, modified NCM samples still have high capacity. The remarkably ameliorative electrochemical performance of Y2O3-coated NCM materials during cycling is because of the Y2O3 coating that may hinder the deleterious reactions between the electrolyte and the cathodes and decrease the charge-transfer resistance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
·
2025
·
IF 1
Mingyuan Zhao,Bowan Tao,Ruipeng Zhao,Xi Chen,Zhenzhe Li,Tian Xie,Qichen Wang,Silong Fang,Ziwen Jin,Yudong Xia
The widespread application of second-generation high-temperature superconducting (2G HTS) tapes has elevated demand for surface smoothing of long-length Hastelloy tapes utilizing simple and low-cost strategies. Amorphous Y 2 O 3 has been used to flatten the long-length Hastelloy tape surfaces via solution deposition planarization (SDP). In this work, the autonomously designed SDP system is applied to flatten the Hastelloy surface while significantly increasing progress rate. As a result, lifting speed up to 75 m/h, while the root mean square (RMS) roughness on Hastelloy tape surfaces was reduced from 28.13 nm to 0.76 nm over 5 × 5 μm² areas. These are superior to those of the state-of-the-art SDP lifting speeds. Additionally, the surface flattening process was elaborated through power spectral density (PSD). The Hastelloy tape surfaces have been confirmed to form a well-biaxially textured MgO buffer layer. The autonomously designed SDP system shed light on an effective strategy for flattening long-length Hastelloy tape surfaces.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Hongxing Wang,Lantao Liu,Weiwei Pang,Yiming Li,Ziyu Sun,Zhigang Zhang,Xiaohong Chen,Huaihe Song
Zinc metal batteries have recently emerged as a promising stable and reversible anode aqueous battery. However, due to the serious dendrite problem and hydrogen evolution problem of the zinc metal anode, the practical application of the zinc metal battery is limited. Here, we propose Y2O3 as an effective coating, which inhibits hydrogen evolution and side reactions by physical isolation and simultaneously prevents dendrite growth by ensuring a uniform Zn-ion flux and fast transport channels generated by Maxwell–Wagner polarization, thus improving the stability of batteries. Meanwhile, in situ/ex situ characterizations and different simulations are conducted to investigate in detail the effect of Maxwell–Wagner polarization on the performance of Zn metal batteries. The symmetric Y2O3@Zn anode system exhibits a stable electroplating/stripping performance over 780 h and enables the Zn battery to achieve a Coulombic efficiency of up to 99.81% over 1000 cycles by reducing side reactions. The Y2O3@Zn||MnO2 full cell delivers a high energy density of 301.42 Wh kg–1 at a power density of 205.04 W kg–1. The work provides insights into the reversibility and stability of zinc anodes and provides a promising way to promote the practical application of Zn metal batteries.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）