Sheng‐Cheng Chiu

ITRI International

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Yuan‐Yao Li

National Chung Cheng University

Wen‐Sheng Chang

ITRI International

Wang-Hua Lin

National Chung Cheng University

Meng-Jey Youh

Ming Chi University of Technology

Chang-Chung Yang

Industrial Technology Research Institute

Chun-Lung Tseng

Epistar (Taiwan)

Chien-Chih Chiang

ITRI International

Hsin-Chih Yu

National Chung Cheng University

Mao‐Chia Huang

ITRI International

Hung-Chih Wu

National Chung Cheng University

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Industrial Technology Research Institute

ITRI International

National Chung Cheng University

National Taiwan University

National Cheng Kung University

National Central University

National Taiwan University of Science and Technology

National Kaohsiung University of Science and Technology

National Tsing Hua University

National Chung Hsing University

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High Electromagnetic Wave Absorption Performance of Silicon Carbide Nanowires in the Gigahertz Range

The Journal of Physical Chemistry C (2010)

Sheng‐Cheng Chiu Hsin-Chih Yu Yuan‐Yao Li

The electromagnetic (EM) wave absorption properties of 2-mm-thick silicon carbide nanowire (SiCNW)−epoxy composites were studied in the range of 2−40 GHz using a free-space antenna-based system. The 35 wt % SiCNW composites exhibited dual-frequency EM wave absorptions of −31.7 and −9.8 dB at 8.3 and 27 GHz, respectively. The minimum reflection loss of −32.4 dB was achieved at 31.1 GHz for the composites containing 25 wt % SiCNW. A study of the loss mechanism of EM wave absorption suggests the combination of the electric conductance loss caused by network-like SiCNWs in the resin matrix and the relaxation polarization loss in the interfaces of SiCNWs and the epoxy resin.

Reflection loss

Dielectric loss

10.1021/jp905127t

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Citations (266)

Synthesis of High-Purity Silicon Carbide Nanowires by a Catalyst-Free Arc-Discharge Method

The Journal of Physical Chemistry C (2007)

Sheng‐Cheng Chiu Chao‐Wei Huang Yuan‐Yao Li

High-purity silicon carbide (SiC) nanowires were synthesized through a catalyst-free arc-discharge process using silicon dioxide powders as a filler in a graphite anode. The characterization of the as-synthesized SiC nanowires showed that the diameter of the single-crystalline SiC nanowires was about 3−15 nm and the length was up to several micrometers. To understand the formation mechanism of the SiC nanowires in the absence of a catalyst, we found that oxygen plays a key role in the growth process and suggest that the growth mechanism of SiC nanowires is a catalyst-free vapor−solid (VS) mechanism. Photoluminescence measurements of the SiC nanowires revealed that the material emits blue-green light with a peak wavelength of 472 nm (CIE coordinates: x = 0.19, y = 0.24).

Vapor–liquid–solid method

Electric arc

Arc lamp

10.1021/jp0687192

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Citations (52)

Field-emission properties of the platinum coated SiO₂nanowires synthesized by thermal evaporation method

Journal of Physics D Applied Physics (2008)

Sheng‐Cheng Chiu Yuan‐Yao Li

Silicon oxide (SiO2) nanowires were synthesized on a 3 cm × 3 cm Si wafer by thermal evaporation of Si@SiO2 core–shell particles under argon atmosphere at 1000 °C for 1 h. The SiO2 nanowires were of diameters ranging from 30 to 100 nm and the lengths were of several micrometres. The growth mechanism of SiO2 nanowires was studied and suggested to be a vapour–solid mechanism. Field-emission (FE) properties of the Pt coated SiO2 nanowires were studied and the result showed that a turn-on electric field of 2.9 V µm−1 was obtained at the vacuum gap of 200 µm. Good FE properties of the Pt coated SiO2 nanowires resulted from the high aspect ratio of the SiO2 nanowires and the excellent work function of platinum.

10.1088/0022-3727/41/24/245408

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Influence of High Loading on the Performance of Natural Graphite-Based Al Secondary Batteries

Energies (2018)

Mao‐Chia Huang Cheng‐Hsien Yang Chien-Chih Chiang Sheng‐Cheng Chiu Yunfeng Chen

In recent years, novel Al secondary batteries with Al anodes, natural graphite cathodes, and ionic liquid electrolytes have received more attention. However, most research on Al secondary batteries used lower graphite loading (<8 mg/cm2), which will inhibit the batteries from commercialization in the future. Here, we prepared Al secondary batteries using Al anode, low-cost natural graphite cathode, and cheaper ionic liquid electrolyte. The effects of loading (7–12 mg/cm2) on performance were investigated. Based on our observations, graphite-based Al secondary batteries (GABs) using 10 mg/cm2 graphite electrodes had better performance of 82 mAh/g and 6.5 Wh/L at a current density of 100 mA/g. Moreover, the 10 mg/cm2 GABs showed a long life of 250 charge–discharge cycles with a high coulombic efficiency of 98% and excellent performance rate up to 1000 mA/g.

Carbon fibers

10.3390/en11102760

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A Carbonyl Iron/Carbon Fiber Material for Electromagnetic Wave Absorption

Journal of Nanoscience and Nanotechnology (2011)

Meng-Jey Youh Hung-Chih Wu Wang-Hua Lin Sheng‐Cheng Chiu Chien-Fa Huang

A carbonyl iron/carbon fiber material consisting of carbon fibers grown on micrometer-sized carbonyl iron sphere, was synthesized by chemical vapor deposition using a mixture of C2H2 and H2. The hollow-core carbon fibers (outer diameter: 140 nm and inner diameter: 40 nm) were composed of well-ordered graphene layers which were almost parallel to the long axis of the fibers. A composite (2 mm thick) consisting of the carbonyl iron/carbon fibers and epoxy resin demonstrated excellent electromagnetic (EM) wave absorption. Minimum reflection losses of -36 dB (99.95% of EM wave absorption) at 7.6 GHz and -32 dB (99.92% of EM wave absorption) at 34.1 GHz were achieved. The well-dispersed and network-like carbon fibers in the resin matrix affected the dielectric loss of the EM wave while the carbonyl iron affected the magnetic loss.

Carbonyl iron

Reflection loss

Carbon fibers

10.1166/jnn.2011.3584

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Citations (13)

Silicon Carbide Nanowire as Nanoemitter and Greenish–Blue Nanophosphor for Field Emission Applications

Nanoscience and Nanotechnology Letters (2012)

Sheng‐Cheng Chiu Wang-Hua Lin Hung-Chih Wu Meng-Jey Youh Chun-Lung Tseng

10.1166/nnl.2012.1284

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Citations (4)

Study of Highly Active and Durable Bifunctional Catalyst for Rechargeable Zinc-Air Battery

Meeting abstracts/Meeting abstracts (Electrochemical Society. CD-ROM) (2018)

Chun‐I Lee Shiauh-Ping Jung Sheng‐Cheng Chiu Chang Chung Yang

Rechargeable zinc-air batteries, which are cost-effective, environmental compatibility, and have high energy density, are promising energy storage devices for renewable energy and power sources for electric transportation. However, the critical issues that impede the commercialization of rechargeable zinc–air batteries are limited charge and discharge cycles and the sluggish kinetics of oxygen reduction and evolution reactions, which affect the round trip efficiency. Over the past years, numerous efforts have been devoted to develop earth-abundant materials as bifunctional catalysts towards both OER and ORR. But a suitable bifunctional catalyst has not really been found yet. Therefore, the rechargeable zinc–air battery with cobalt oxide nanoparticles as a bifunctional catalyst are investigated. The result shows that the rechargeable zinc-air batteries in a two-electrode configuration exhibited a small charge–discharge voltage polarization of ~0.70 V at 5 mA cm −2 , high reversibility and stability during battery discharge, charge, and cycling processes.

Bifunctional catalyst

10.1149/ma2018-02/60/2175

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Correlations between Electrochemical Performance of Aluminum Battery and Graphite Characteristics of Carbon Cathode

Meeting abstracts/Meeting abstracts (Electrochemical Society. CD-ROM) (2018)

Sheng‐Cheng Chiu Yen-Liang Li Ping‐I Pan Chien-Chih Chiang Chang-Chung Yang

Rechargeable aluminum battery is promising to replace lead-acid battery for energy storage systems (ESSs) and vehicle cranking system because of non-flammability, ultra-fast charge and discharge capability, environmental-friendliness, and long cycle life. However, Al battery is hindered by low working voltage, low specific capacity of cathode materials, high cost of ionic liquids (ILs) and high self-discharge rate. The first two obstacles are highly related to cathode materials. In this study, electrochemical properties ( e.g., cyclic voltammetry and galvanostatic charge/discharge) of Al battery using natural graphite, artificial graphite, soft carbon and hard carbon as cathode materials are investigated. At a current 100 mA/g, natural graphite (loading density of 13 ± 2 mg/cm 2 ) shows the highest discharge capacity of 98 mAh/g. Raman spectroscopy and X-ray diffraction (XRD) are also employed to explore carbon properties, causing different energy storage performance. We suggest carbon, natural graphite, with low-disorder graphite structure delivers high capacity.

Carbon fibers

10.1149/ma2018-02/1/71

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Preparation and Characterization of Porous Carbon Nanofibers from Thermal Decomposition of Poly(ethylene glycol)

The Journal of Physical Chemistry C (2008)

Chao‐Wei Huang Sheng‐Cheng Chiu Wang-Hua Lin Yuan‐Yao Li

Porous carbon nanofibers (CNFs) were synthesized on wafer uniformly by thermal decomposition of poly(ethylene glycol) with the presence of nickel catalyst at 600 °C under nitrogen atmosphere. High purity porous CNFs with diameters of 40−60 nm and a few micrometers in length demonstrated a unique character of graphitic structure and open-edge structure of mesopores. In comparison with other methods for the formation of porous CNFs such as activation of carbon fibers or template method, our method provides a one-step process in which the pores can be created while the fibers grow. Characterizations of porous CNFs found that the disordered graphene layers were generated from polycrystalline Ni catalysts, and the stacking of disordered graphene layers created 3−6 nm mesopores with open edges. Porous CNFs with open edges, which is a different morphology from that of conventional activated CNFs, were suggested to be a good medium for mass transport, while graphene layers may serve as a good electrical conductive medium for the applications of electrodes, catalyst supports, and adsorption.

Carbon fibers

10.1021/jp709795d

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Citations (27)

Sodium Vanadium Fluorophosphates Morphology Effects on Rechargeable Sodium Ion Batteries

Meeting abstracts/Meeting abstracts (Electrochemical Society. CD-ROM) (2019)

Robin Chih-Hsing Wang Sheng‐Cheng Chiu Yu-Wen Yeh Chang-Chung Yang Wen‐Sheng Chang

With growing demands of using sustainable energy, a reliable energy storage system is truly essential. Sodium ion battery is one of the candidates which features in low cost and reasonable battery performances for future energy storage. In our previous works, promising cathode material, carbon-coated sodium vanadium fluorophosphates (Na 3 V 2 (PO 4 ) 2 F 3 /C, NVPF/C) nanocomposites with sodium superionic conductor (NASICON) structures, have been investigated and displayed high capacities at high operation voltage. Some thorny issues arising, however, during the small-scale production. First, the discharging capacities decrease as the loading of active materials increase. Second, the original synthesis method is time consuming and low yield. Considering the economic and technical feasibility, we introduce some measures to improve both the manufacture process and the battery performance. The adoption of spray-drying not only effectively reduces the production time of NVPF/C but transforms the shape of NVPF/C from blocks to spheres. In addition, different recipes of additives results in different morphology of NVPF/C particles. Here we present three types of NVPF/C, including blocks, hollow spheres and solid spheres, which are confirmed by SEM. X-ray diffraction indicated that the purity of NVPF crystalline increased by the new process. Coin cells assembled with Na foils reversible discharge capacities of 105 mAh g −1 at 1C, accompanied with high active material loading over 10 mg/cm 2 .

Fast ion conductor

Sodium-ion battery

10.1149/ma2019-04/10/0437

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