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Application of Spiky Nickel Nanoparticles to Hydrogen Evolution Reaction
Syed Asad Abbas,Ahyeon Ma,Dongho Seo,Yun Ji Lim,Kwang-Deog Jung,Ki Min Nam 대한화학회 2020 Bulletin of the Korean Chemical Society Vol.41 No.11
The development of an efficient water splitting catalyst is a requirement for sustainable hydrogen production. Ni catalysts with different shapes were prepared using a solvothermal method for hydrogen evolution reaction (HER). The growth of the Ni particles was manipulated by controlling the reaction temperature and surfactant during the solvothermal reaction. The HER activity of the herein obtained Ni catalysts, namely semi-spherical, dendritic, and spiky nanoparticles were evaluated in alkaline conditions. Spiky Ni nanoparticles exhibited superior HER catalytic activity compared to that of spherical and dendritic Ni nanoparticles. The effect of morphology and electrochemical active sites has been fully investigated.
Abbas Syed Asad,Ma Ahyeon,Seo Dongho,Lim Yun Ji,Park Joon Yong,Lee Gaehang,Nam Ki Min 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.11
Electrochemical CO2 reduction to carbon monoxide (CO) is immensely important for sustainable CO2 recycling. In this study, we established a facile synthetic method for large-scale production of Ag nanoparticles, which can be used for the selective electrochemical reduction of CO2 to CO. Thermal decomposition and reduction of AgNO3 produced Ag nanoparticles on a gram-scale in high yield (over 90%) with a homogeneous size distribution. The oleylaminecapped Ag nanoparticles were quasi-spherical with diameters of 9 2 nm. Ag nanoparticles are capable of electrochemical CO2 reduction to CO with high activity and stability. The CO selectivity of the catalyst was in the vicinity of 90% over a wide potential range and reached 94.2% at 1.4 V vs. RHE. The Ag nanoparticles showed good stability over 24 h. Different surface functional groups, for example, thiol and citrate were investigated to understand their influence on the variation in CO selectivity.
Park, Gisang,Park, Joon Yong,Seo, Jong Hyeok,Oh, Kyung Hee,Ma, Ahyeon,Nam, Ki Min The Royal Society of Chemistry 2018 Chemical communications Vol.54 No.44
<P>A pinhole-free BiVO4 electrode was successfully synthesized using an ultrasonic-assisted synthetic method on a conductive substrate. The pinhole-free BiVO4 electrode showed highly improved photoelectrochemical activity for both sulfite oxidation and water oxidation. The blocking recombination processes were examined to clarify the enhanced photoelectrochemical performances.</P>
NS3K : A 3nm Nanosheet FET Library for VLSI Prediction in Advanced Nodes
Taehak Kim,Jaehoon Jeong,Seungmin Woo,Jeonggyu Yang,Hyunwoo Kim,Ahyeon Nam,Changdong Lee,Jinmin Seo,Minji Kim,Siwon Ryu,Yoonju Oh,Taigon Song 대한전자공학회 2021 대한전자공학회 학술대회 Vol.2021 No.6
Nanosheet FETs (NSFETs) are expected as future devices that replace FinFETs beyond the 5nm node. Despite the importance of the devices, few studies report the impact of NSFETs in the full-chip level. Therefore, this paper presents NS3K, the first 3nm NSFET library, and presents the results in a full-chip scale. Based on our results, 3nm NSFET reduces power by -27.4%, total wirelength by -25.8%, number of cells by -8.5%, and area by -47.6% over 5nm FinFET, respectively, due to better devices and interconnect scaling. However, careful device/layout designs followed by routing-resource considering standard cells are required to maximize the advantages of 3nm technology.