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Hong, Sujik,Lee, Seunghwa,Kim, Sohaeng,Lee, Jae Kwang,Lee, Jaeyoung Elsevier 2017 CATALYSIS TODAY - Vol.295 No.-
<P><B>Abstract</B></P> <P>In this study, we first demonstrate that CO production selectivity from CO<SUB>2</SUB> on Au electro-catalyst depends on the type of electrolyte anion. Comparing the faradaic efficiencies of H<SUB>2</SUB>, HCOO<SUP>−</SUP> and CO in the presence of different anions such as Cl<SUP>−</SUP>, HPO<SUB>4</SUB> <SUP>2−</SUP>, SO<SUB>4</SUB> <SUP>2−</SUP> and HCO<SUB>3</SUB> <SUP>−</SUP> at constant potential of −0.7V (<I>vs.</I> RHE), we observe that the CO/H<SUB>2</SUB> ratio could be enhanced due to strongly adsorbed anion such as Cl<SUP>−</SUP>. Although HPO<SUB>4</SUB> <SUP>2−</SUP> is more strongly adsorbed than SO<SUB>4</SUB> <SUP>2−</SUP> and HCO<SUB>3</SUB> <SUP>−</SUP> on the surface of electrode, CO<SUB>2</SUB> reduction in HPO<SUB>4</SUB> <SUP>2−</SUP> containing solution exhibited a minimum faradaic efficiency of CO (11%) but a maximum faradaic efficiency of H<SUB>2</SUB> (70%). Based on physicochemical analytical tools (LSV, EIS, SEM, XPS and XRD) and according to previous studies, we conclude that the product distribution is associated with distinct properties caused by characteristic of each anion when adsorbed on the electrode surface such as specific adsorption strength and intrinsic characteristic of anions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The anion effect of 4 electrolytes for CO<SUB>2</SUB>RR on Au catalyst are investigated. </LI> <LI> The specific adsorption of anions could contribute to suppressing HER. </LI> <LI> Chloride anion plays a notable role as increasing CO/H<SUB>2</SUB> production ratio. </LI> <LI> Phosphate anion contributes to decrease CO/H<SUB>2</SUB> production ratio. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Depending on electrolytes containing different anions, CO/H<SUB>2</SUB> production ratio of CO<SUB>2</SUB> electroreduction on Au catalyst was differently observed. Usually, a specific adsorption strength of anions played a key role in determination of CO/H<SUB>2</SUB> ratio by a suppressing hydrogen evolution reaction. However, unlike that, certain anions such as chloride and phosphate differently contribute to increase CO/H<SUB>2</SUB> ratio due to their intrinsic characteristics.</P> <P>[DISPLAY OMISSION]</P>
Lee, Seunghwa,Hong, Sujik,Lee, Jaeyoung Elsevier 2017 CATALYSIS TODAY - Vol.288 No.-
<P><B>Abstract</B></P> <P>Controlling product selectivity is regarded as one of the main barriers in the application of Cu-based electrodes to electrochemical CO<SUB>2</SUB> reduction and hence significant studies on experimental factors to improve the selectivity towards desired products. In particular, two pH parameters appear to be important in controlling product selectivity of the CO<SUB>2</SUB> reduction process. We study how both bulk and local pH conditions affect product distributions during CO<SUB>2</SUB> reduction on oxygen-evacuated Cu<SUB>2</SUB>O electrode. In contrast with previous studies of local pH effect on CO<SUB>2</SUB> reduction using metallic Cu, our results suggest that not always is the preferential production of C2 compounds (C<SUB>2</SUB>H<SUB>4</SUB> +C<SUB>2</SUB>H<SUB>6</SUB>) achieved by high local pH condition irrespective of catalyst materials, but rather bulk pH condition could contribute to ability to control product selectivity. It is finally demonstrated that the bulk pH effect, often underestimated but related to carbonate speciation, is associated with the direct reduction of HCO<SUB>3</SUB> <SUP>−</SUP> to HCOO<SUP>−</SUP>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Electrocatalytic reduction of CO<SUB>2</SUB> on oxygen-evacuated Cu<SUB>2</SUB>O. </LI> <LI> Controlling production of CO and HCOO<SUP>−</SUP> <I>via</I> different bulk pH contribution. </LI> <LI> Prioritizing bulk and local pH effect on product selectivity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>While the electrochemical reduction of CO<SUB>2</SUB> into C2 compounds on Cu metal was selectively achieved by higher local pH condition, the local pH effect became less important in the CO<SUB>2</SUB> reduction on the oxygen-evacuated Cu<SUB>2</SUB>O. Instead, on the oxygen-evacuated Cu<SUB>2</SUB>O, we demonstrate that changing the bulk pH condition could influence on product selectivity and the bulk pH effect is derived from the molar fraction of HCO<SUB>3</SUB> <SUP>−</SUP> with its direct reduction to HCOO<SUP>−</SUP>.</P> <P>[DISPLAY OMISSION]</P>
키오스크를 이용한 장애인 및 약자를 위한 음성인식 주문시스템
이효재(Hyo-Jai Lee),홍창호(Changho Hong),조성호(Sung Ho Cho),윤채원(Chaiwon Yoon),김동완(Dongwan Kim),최승화(Seunghwa Choi) 한국정보통신학회 2021 한국정보통신학회 종합학술대회 논문집 Vol.25 No.1
최근 COVID-19로 인하여 무인 점포가 늘어나고 있는 추세이다. 무인 점포에는 주로 키오스크를 이용해서 결제를 하고 있는데, 일부 신체 장애를 가진 사람들이나 휠체어를 이용하는 장애인들은 그 사용이 쉽지 않다. 또한 어린아이들이나 노인들도 나이가 많아질수록 키오스크와 같은 새로운 기술을 사용하는 것에 어려움을 보이고 있다. 본 연구에서는 이러한 문제점을 보완하기 위해 사용자가 키오스크와 상호작용을 할 때 시각적인 요소 뿐만 아니라 음성인식 기능을 추가하여 음성으로 주문명령을 수행할 수 있는 시스템을 설계하였다. Recently, the number of unmanned stores is increasing due to COVID-19. In unmanned stores, payments are mainly made using kiosks, but some people with physical disabilities or people with disabilities who use wheelchairs are not easy to use it. Also, young children and the elderly are also having difficulty using new technologies such as kiosks as they get older. In this study, in order to compensate for these problems, we intend to design and implement a system capable of performing order by a speech recognition function as well as a visual system when a user interacts with a kiosk.