scholarly journals Adhesion-Increased Carbon Nanowalls for the Electrodes of Energy Storage Systems

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4759 ◽  
Author(s):  
Hyeokjoo Choi ◽  
Seokhun Kwon ◽  
Hyunil Kang ◽  
Jung Hyun Kim ◽  
Wonseok Choi
Keyword(s):  
Energy Storage ◽  
Indium Tin Oxide ◽  
Microwave Plasma ◽  
Storage Systems ◽  
Transparent Conducting Oxide ◽  
Chemical Vapor ◽  
Rf Magnetron Sputtering ◽  
Energy Storage Systems ◽  
Carbon Nanowalls ◽  
Carbon Based Nanomaterials

Carbon nanowalls (CNWs), which are used as electrodes for secondary batteries in energy storage systems (ESSs), have the widest reaction surface area among the carbon-based nanomaterials, but their application is rare due to their low adhesion with substrates. Indium tin oxide (ITO), a representative transparent conducting oxide (TCO) material, is widely used as the electrode for displays, solar cells, etc. Titanium nitride (TiN) is a well-used material as an interlayer for improving the adhesion between two materials. In this study, ITO or TiN thin films were used as an interlayer to improve the adhesion between a CNW and a substrate. The interlayer was deposited on the substrate using a radio frequency (RF) magnetron sputtering system with a four-inch TiN or ITO target. CNWs were grown on the interlayer-coated substrate using a microwave-plasma-enhanced chemical vapor deposition (MPECVD) system with a mixture of methane (CH4) and hydrogen (H2) gases. The adhesion of the CNW/interlayer/substrate structure was observed through ultrasonic cleaning.

Characterization Analysis According to Growth Temperature of Carbon Nanowall on Metal Coated Substrate for Electrode Application of Energy Storage

2017 ◽  
Vol 904 ◽  
pp. 115-119
Author(s):  
Jong Kug Park ◽  
Won Seok Choi ◽  
Hyun Suk Hwang ◽  
Kyoung Hak Lee ◽  
Jung Hyun Kim ◽  
...  
Keyword(s):  
Energy Storage ◽  
Growth Temperature ◽  
Microwave Plasma ◽  
Chemical Vapor ◽  
Rf Magnetron Sputtering ◽  
Nickel Layer ◽  
Cross Sectional ◽  
Storage Media ◽  
Carbon Nanowalls ◽  
Core Storage

Secondary cells, which are the core storage media of energy storage systems (ESS), and carbon nanowalls (CNWs), which are expected to improve the performance of supercapacitors while being used as their electrodes, were investigated in this study. CNWs were directly grown on the substrate, and the substrate was a Si wafer with a nickel layer deposited on top of it. The nickel layer was deposited with the RF-magnetron sputtering method using a 4-inch Ni target. The CNWs were grown on the prepared substrate using microwave plasma-enhanced chemical vapor deposition (PECVD). The substrate temperature was changed from 550 to 800°C by 50°C increments to identify the growth characteristics according to the growth temperature. The surficial and cross-sectional images according to the temperature were analyzed using a field emission scanning electron microscope (FE-SEM). It was confirmed that the density of the CNWs increased along with the temperature. Especially, it was confirmed that the density increased dramatically at 750°C or higher.

Characteristics of Carbon Nanowalls According to the Indium Tin Oxide Interlayer Thickness

2020 ◽  
Vol 12 (8) ◽  
pp. 1261-1264
Author(s):  
Hyeokjoo Choi ◽  
Chiwon Choi ◽  
Seok Hun Kwon ◽  
Young Park ◽  
Wonseok Choi
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Chemical Vapor ◽  
Rf Magnetron Sputtering ◽  
Adhesive Force ◽  
Limited Range ◽  
Interlayer Thickness ◽  
Washing Machine ◽  
Carbon Nanowalls ◽  
Contact Angle Analysis

Materials with low adhesion have a limited range of applications. To solve this problem, the stress can be alleviated by inserting an interlayer between the substrate and the semiconductor material. As such, the adhesion can also be improved by depositing an interlayer between the carbon nanowall (CNW) with a low adhesive force and the substrate. In this study, indium tin oxide (ITO), whose thickness was controlled via radio frequency (RF) magnetron sputtering on the substrate, was used as an interlayer, and CNWs were grown using microwaveplasma-enhanced chemical vapor deposition (MPECVD) with a mixture of methane (CH4) and hydrogen (H2) gases. To confirm the adhesion between the CNWs and the substrate according to the thickness of the ITO interlayer, the dissociation of the CNWs was confirmed using an ultrasonic washing machine. Hall measurement was used to investigate the electrical properties. Afterwards, to analyze the change in the surface structure, contact angle analysis and field emission scanning electron microscopy (FESEM) analysis performed.

scholarly journals Growth Properties of Carbon Nanowalls on Nickel and Titanium Interlayers

Molecules ◽  
2022 ◽  
Vol 27 (2) ◽  
pp. 406
Author(s):  
May Tran Thi ◽  
Seokhun Kwon ◽  
Hyunil Kang ◽  
Jung-Hyun Kim ◽  
Yong-Kyu Yoon ◽  
...  
Keyword(s):  
Microwave Plasma ◽  
Metal Layer ◽  
Chemical Vapor ◽  
Rf Magnetron Sputtering ◽  
Light Transmittance ◽  
Cross Sectional ◽  
Coated Glass ◽  
Glass Substrates ◽  
Vis Spectroscopy ◽  
Carbon Nanowalls

This research is conducted in order to investigate the structural and electrical characteristics of carbon nanowalls (CNWs) according to the sputtering time of interlayers. The thin films were deposited through RF magnetron sputtering with a 4-inch target (Ni and Ti) on the glass substrates, and the growth times of the deposition were 5, 10, and 30 min. Then, a microwave plasma-enhanced chemical vapor deposition (PECVD) system was used to grow CNWs on the interlayer-coated glass substrates by using a mixture of H2 and CH4 gases. The FE-SEM analysis of the cross-sectional and planar images confirmed that the thickness of interlayers linearly increased according to the deposition time. Furthermore, CNWs grown on the Ni interlayer were taller and denser than those grown on the Ti interlayer. Hall measurement applied to measure sheet resistance and conductivity confirmed that the electrical efficiency improved significantly as the Ni or Ti interlayers were used. Additionally, UV-Vis spectroscopy was also used to analyze the variations in light transmittance; CNWs synthesized on Ni-coated glass have lower average transmittance than those synthesized on Ti-coated glass. Based on this experiment, it was found that the direct growth of CNW was possible on the metal layer and the CNWs synthesized on Ni interlayers showed outstanding structural and electrical characterizations than the remaining interlayer type.

H∞ Control Approach to Reduction of Energy Capacity of Energy Storage Systems

2017 ◽  
Vol 137 (8) ◽  
pp. 596-597
Author(s):  
Kenta Koiwa ◽  
Kenta Suzuki ◽  
Kang-Zhi Liu ◽  
Tadanao Zanma ◽  
Masashi Wakaiki ◽  
...  
Keyword(s):  
Energy Storage ◽  
Storage Systems ◽  
Energy Capacity ◽  
Energy Storage Systems ◽  
Control Approach

MULTISCALE THERMAL TRANSPORT IN SOLAR THERMOCHEMICAL ENERGY STORAGE SYSTEMS

2018 ◽  
Author(s):  
Like Li ◽  
Kelvin Randhir ◽  
James F. Klausner ◽  
Ren-Wei Mei ◽  
Nick AuYeung
Keyword(s):  
Energy Storage ◽  
Thermal Transport ◽  
Storage Systems ◽  
Energy Storage Systems ◽  
Solar Thermochemical
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