http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Abrenica, Graniel Harne A.,Ocon, Joey D.,Lee, Jaeyoung Elsevier 2016 Current Applied Physics Vol.16 No.9
<P>Multi-electron reaction anodes have been exciting battery materials due to their exceptionally high energy densities. Herein, nanostructured iron borides (nanoFeB) have been synthesized via dip-coating chemical reduction in conjunction with a heat treatment procedure and were directly used as anodes in a metal/metalloid-air battery. The crystal structure, particle size, BET surface area, and electrochemical properties of iron boride samples treated at four different temperature conditions (200 degrees C, 300 degrees C, 400 degrees C, and 500 degrees C) were investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N-2 adsorption-desorption isotherms, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). The nanoFeB heat-treated at 300 degrees C (nanoFeB(300)) exhibits the highest surface area among reported values in literature and demonstrates excellent anode discharge performance in a metal/metalloid-air battery. (C) 2016 Elsevier B.V. All rights reserved.</P>
Graniel Harne A. Abrenica,Joey D. Ocon,이재영 한국물리학회 2016 Current Applied Physics Vol.16 No.9
Multi-electron reaction anodes have been exciting battery materials due to their exceptionally high energy densities. Herein, nanostructured iron borides (nanoFeB) have been synthesized via dip-coating chemical reduction in conjunction with a heat treatment procedure and were directly used as anodes in a metal/metalloid-air battery. The crystal structure, particle size, BET surface area, and electrochemical properties of iron boride samples treated at four different temperature conditions (200 C, 300 C, 400 C, and 500 C) were investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N2 adsorptiondesorption isotherms, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). The nanoFeB heat-treated at 300 C (nanoFeB300) exhibits the highest surface area among reported values in literature and demonstrates excellent anode discharge performance in a metal/metalloid-air battery.
Quasi-perpetual discharge behaviour in p-type Ge–air batteries
Ocon, Joey D.,Kim, Jin Won,Abrenica, Graniel Harne A.,Lee, Jae Kwang,Lee, Jaeyoung The Royal Society of Chemistry 2014 Physical chemistry chemical physics Vol.16 No.41
<P>Metal–air batteries continue to become attractive energy storage and conversion systems due to their high energy and power densities, safer chemistries, and economic viability. Semiconductor–air batteries – a term we first define here as metal–air batteries that use semiconductor anodes such as silicon (Si) and germanium (Ge) – have been introduced in recent years as new high-energy battery chemistries. In this paper, we describe the excellent doping-dependent discharge kinetics of p-type Ge anodes in a semiconductor–air cell employing a gelled KOH electrolyte. Owing to its Fermi level, n-type Ge is expected to have lower redox potential and better electronic conductivity, which could potentially lead to a higher operating voltage and better discharge kinetics. Nonetheless, discharge measurements demonstrated that this prediction is only valid at the low current regime and breaks down at the high current density region. The p-type Ge behaves extremely better at elevated currents, evident from the higher voltage, more power available, and larger practical energy density from a very long discharge time, possibly arising from the high overpotential for surface passivation. A primary semiconductor–air battery, powered by a flat p-type Ge as a multi-electron anode, exhibited an unprecedented full discharge capacity of 1302.5 mA h g<SUB>Ge</SUB><SUP>−1</SUP> (88% anode utilization efficiency), the highest among semiconductor–air cells, notably better than new metal–air cells with three-dimensional and nanostructured anodes, and at least two folds higher than commercial Zn–air and Al–air cells. We therefore suggest that this study be extended to doped-Si anodes, in order to pave the way for a deeper understanding on the discharge phenomena in alkaline metal–air conversion cells with semiconductor anodes for specific niche applications in the future.</P> <P>Graphic Abstract</P><P>A semiconductor–air battery, powered by a flat p-type Ge anode, exhibits an unprecedented full discharge energy capacity and anode utilization efficiency relative to commercial metal–air batteries, and new metal–air batteries using 3D, nanostructured, and porous metal anodes. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp02134g'> </P>
Park, Dong-Won,Kim, Soeun,Ocon, Joey D.,Abrenica, Graniel Harne A.,Lee, Jae Kwang,Lee, Jaeyoung American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.5
<P>We report the fabrication of nanoporous silicon (nPSi) electrodes via electrochemical etching to form a porous Si layer with controllable thickness and pore size. Varying the etching time and ethanolic HF concentration results in different surface morphologies, with various degrees of electrolyte access depending on the pore characteristics. Optimizing the etching condition leads to well-developed nPSi electrodes, which have thick porous layers and smaller pore diameter and exhibit improved discharge behavior as anodes in alkaline Siair cells in contrast to flat Si anode. Although electrochemical etching is effective in improving the interfacial characteristics of Si in terms of high surface area, we observed that mild anodization occurs and produces an oxide overlayer. We then show that this oxide layer in nPSi anodes can be effectively removed to produce an nPSi anode with good discharge behavior in an actual alkaline Siair cell. In the future, the combination of high surface area nPSi anodes with nonaqueous electrolytes (e.g., room-temperature ionic liquid electrolyte) to minimize the strong passivation behavior and self-discharge in Si could lead to Si-air cells with a stable voltage profile and high anode utilization.</P>