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Jung, Chan-Hee,Sohn, Joon-Yong,Kim, Hyo-Sub,Hwang, In-Tae,Lee, Hong-Joon,Shin, Junhwa,Choi, Jae-Hak Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.439 No.-
<P><B>Abstract</B></P> <P>In this work, we demonstrated that carbon nanosheet (CNS) can easily be produced by a room-temperature, solid-state proton irradiation-induced clustering of poly(vinyl chloride) (PVC) films followed by carbonization. The results of the optical, chemical, and structural analyses revealed that oxidized and sp<SUP>2</SUP>-hybridized carbon clusters were effectively created in the PVC thin film by combined dehydrochlorination and inter-coupling reactions during proton irradiation. This was further converted to pseudo-hexagonally-structured nano-crystalline CNS with 2-D symmetry and metallic transporting character by high-temperature treatment. As a result, the CNS exhibited a very high electrical conductivity (587 S/cm) without a significant change in their thickness, a low surface roughness (0.36 nm), and a high work function (5.11 eV). These findings demonstrate that the radiation-based approach opens new avenues for the design and development of 2-D CNS as a graphene allotrope for the application of electronic devices, including field-effect transistors, electric heating devices, biosensors, supercapacitors, and fuel cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Carbon nanosheet (CNS) was prepared by proton irradiation and carbonization. </LI> <LI> Carbon clusters are formed in PVC thin film by proton irradiation. </LI> <LI> They are thermally converted to pseudo-hexagonally-structured nano-crystalline CNS. </LI> <LI> It exhibits good electrical and electronic properties with low surface roughnesses. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>This study describes the preparation of poly(vinyl chloride)-derived pseudo-hexagonal-structured carbon nanosheets by ion irradiation-induced carbon clustering and carbonization.</P> <P>[DISPLAY OMISSION]</P>
Jung, Chan-Hee,Noh, Yong-Jin,Bae, Jun-Ho,Yu, Jai-Hoon,Hwang, In-Tae,Shin, Junhwa,Shin, Kwanwoo,Lee, Jae-Suk,Choi, Jae-Hak,Na, Seok-In Elsevier 2017 Nano energy Vol.31 No.-
<P><B>Abstract</B></P> <P>In this research, we demonstrate that aliphatic polyacrylonitrile-grafted reduced graphene oxide (PRGO) hybrid can function efficiently as an all-round hole-extraction layer (HEL) in organic and organic-inorganic hybrid perovskite photovoltaic devices (OPVs and PePVs). The hybrid-structure PRGO was developed by facile and scalable in-situ radiation-induced reduction and graft polymerization with polymerizable styryl-functionalized graphene oxide and acrylonitrile. The newly developed PRGO exhibits long-term dispersion stability of six months even up to the high concentration of 10mg/ml. It also shows a full-cover uniform thin-film morphology, good electrical conductivity (0.87S/cm), high work function (4.87eV), and excellent weather stability. Moreover, the incorporation of PRGO (as a HEL) into the OPVs and PePVs results in greater efficiency than chemically-converted graphene nanoflakes references, and device durability superior to poly(ethylenedioxythiophene):poly(styrene sulfonate)-based ones with comparable power conversion efficiencies. Noticeably, our finding demonstrates that the hybrid-structure PRGO provides an all-round and efficient hole-extraction material for use in various conjugated-polymer and perovskite-based PV systems.</P> <P><B>Highlights</B></P> <P> <UL> <LI> PAN-grafted reduced graphene oxide (PRGO) hybrid was newly synthesized. </LI> <LI> PRGO exhibited a uniform thin film with good σ, high WF, and excellent stability. </LI> <LI> Thin film properties of PRGO overwhelmed those of conventional GO and RGOs. </LI> <LI> This worked well as a hole-extraction layer in organic and perovskite photovoltaics. </LI> </UL> </P> <P><B>Graphical absract</B></P> <P>[DISPLAY OMISSION]</P>
Kang, Segoo,Jung, Doo-Hwan,Shin, Junhwa,Kim, Sang-Kyung,Shul, Yonggun,Peck, Dong-Hyun Elsevier 2014 Journal of membrane science Vol.459 No.-
Proton exchange membranes were prepared by y-ray radiation-induced grafting onto ETFE films, crosslinking with styrene/divinylbenzene (DVB) mixtures and a subsequent sullonation. Effects of the DVB content on the membrane properties such as ion exchange capacity (lEC), proton conductivity, and methanol permeability were investigated. Membrane-electrode assemblies (MEA) containing the prepared membranes were fabricated for direct methanol fuel cells (DMFC), and the MEA performance was examined in operation with various concentrations of methanol. Durability of the MEAs was investigated using a 3 M methanol solution for 1000 h, and the polarization curves and impedance spectra were measured. Physicochemical properties of catalysts and membrane before and after the long-term operation were analyzed by TOM, XRD, lEC, and proton conductivity. Performance and durability of the selected membranes were also confirmed in the operation of a 6-cell stack with 3 M methanol solution. (C) 2014 Elsevier B.V. All rights reserved,
The experimental study of 1 ton/day coal gasifier using Adaro coal
박세익(Park, Seik),정재화(Jung, Jaehwa),서혜경(Seo, Hai-Kyung),이중원(Lee, Joongwon),주지선(Ju, Ji-Sun),지준화(Ji, Junhwa),김미영(Kim, Miyoung),김기태(Kim, Kitae) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
Korea Electric Power Research Institute (KEPRI) has developed a compact coal-gasification system to accumulate our experiment skills. The combustion furnace for residual oil was modified as a small size coal gasifier. Recently, coal feeding system was also upgraded to control coal feed rate more accurately. Our research group has conducted several experiments to find out the effect of O₂/coal ratio on the cold gas efficiency. Furthermore, the effect of N₂/coal ratio on the transport characteristics was also studied. According to the calculation of heat and mass balance, the cold gas efficiency was estimated to the maximum at O₂/coal ratio of around 0.73. But small size gasifier such as ours required higher value of O₂/coal ratio than that of the theoretical estimation. On the optimal N₂/coal ratio, we noticed that the coal feed rate was intimately related with the transporting gas pressure and the pipe diameter.
자동차 산업 발전을 위한 저탄소차 협력금제도에 대한 연구
맹해양(MENG HAIYANG),정준화(Jung Junhwa) 한국통상정보학회 2014 통상정보연구 Vol.16 No.4
본 연구는 최근 논란이 되고 있는 ‘저탄소차 협력금제도’에 대해 살펴보고자 한다. 제도 도입의 취지와 목적, 필요성 등을 통해 자동차 산업 발전을 위한 대안은 무엇인지 제시하고자 하였다. 저탄소차 협력금 제도의 도입은 차량구입비용에 큰 변화를 가져옴으로써 차량구매관행을 크게 변화시킬 수 있으며, 이를 통해 차량에서 배출되는 온실가스의 감축 효과를 기대할 수 있을 것으로 예상된다. 그러나 제도의 성공적 정착을 위해서는 무엇보다도 국민들이 공감할 수 있는 적절한 수준에서 보조금-부담금 구간 설정이 이루어져야 할 것이다. 또한 제도 시행 이전에 자동차 관련 기존 세제에 대한 조정, 부담금의 분할 징수 등의 방안에 대해서도 충분한 검토가 있어야 할 것으로 여겨진다. 자동차 제작사의 경우 제도시행 시점까지 수입차와 동등한 수준의 이산화탄소 배출량을 기록할 수 있도록 기술개발에 최선을 다해야 할 것이며, 정부 역시 이러한 노력에 대한 지원을 강화해야 할 것이다. In this study, it investigates the highly controversial issue “low carbon car subsidy”. Through the policy’s intent, purpose, and necessity, it aims to present alternatives for automotive industry development. Introducing the low carbon car subsidy will bring a huge change to the vehicle purchase practices by changing vehicle purchase cost. It expects that this change will reduce greenhouse gas emission from vehicles. For successful settlement of the system, it shall set up the target sections for subsidy and levy appropriately in order to get the nation’s consensus. Additionally, it has to conduct sufficient reviews the measures such as adjustment to the existing auto tax, divided payments of burden charge, etc before enforcing the system. In terms of the automobile industry, it must do their level best in technical development in order to meet the carbon dioxide emission level of imported cars until the enforcement. Also, the government has to strengthen its support to the industry.
Lee, Byoung-Min,Jung, Jin-Mook,Hwang, In-Tae,Shin, Junhwa,Hong, Sung-Kwon,Jung, Chan-Hee,Jeong, Young Gyu,Choi, Jae-Hak Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.456 No.-
<P><B>Abstract</B></P> <P>In this study, the development of electrically-heatable carbon thin films (CTFs) from water-soluble poly(vinyl alcohol) (PVA) is described. CTFs are easily obtained by room-temperature and solid-state proton irradiation-induced stabilization of PVA thin films followed by carbonization at a high temperature. The results of the chemical, optical, and structural analyses reveal that polyene-network structures, enabling high-temperature dimensional stability, are effectively created in the PVA thin films by combined reactions of crosslinking and dehydration during proton irradiation; these structures are further converted to pseudo-graphitic CTFs by carbonization. The prepared CTFs exhibit the fluence and thickness-dependent electrical conductivity ranging from 0.8 × 10<SUP>2</SUP> to 2.63 × 10<SUP>2</SUP> S cm<SUP>−1</SUP>, and a very low surface roughness of below 0.41 nm. Moreover, the prepared CTFs show excellent electric-heating characteristics and the performance is clearly dependent on the thickness and fluence. The CTFs prepared in this study have good potential for application in the fabrication of automobiles, smart windows, and medical devices for deicing, defrosting, and warming.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Carbon thin films (CTFs) were prepared by proton irradiation and carbonization. </LI> <LI> The CTFs showed a high electrical conductivity and a very low surface roguhness. </LI> <LI> The CTFs exhibited an excellent electric heating performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>This study describes the preparation of poly(vinyl alcohol)-derived carbon thin films by via simple dry and ambient proton irradiation-induced stabilization and carbonization.</P> <P>[DISPLAY OMISSION]</P>
Fabrication of large Pt nanoparticles-decorated rGO counter electrode for highly efficient DSSCs
Ahn, Hyo-Jin,Lee, Jung-Soo,Kim, Hyo-Sub,Hwang, In-Tae,Hong, Ji-Hyun,Shin, Junhwa,Jung, Chan-Hee Elsevier 2018 Journal of industrial and engineering chemistry Vol.65 No.-
<P><B>Abstract</B></P> <P>This study describes the radiolytic fabrication of large Pt nanoparticles (NPs)-decorated reduced graphene oxide (L-Pt/rGO) and its use as a counter electrode (CE) in dye-sensitized solar cells (DSSCs). A homogenous aqueous solution of GO in 10wt% isopropyl alcohol (IPA) aqueous solution containing Pt precursor was irradiated with γ-ray at room temperature to prepare the L-Pt/rGO. The analytic results from TEM, EDX, XPS, and Raman revealed that the rGO decorated with 100nm Pt NPs was successfully formed by the γ-ray irradiation-induced reduction of both the GO and Pt precursor in aqueous IPA solution. Based on the results of the DSSCs performance test, the energy conversion efficiency of the DSSCs with the L-Pt/rGO-based CE outperformed that with the rGO-based one due to the lower sheet resistance, and even was comparable to that of the Pt-based CE. This L-Pt/rGO fabricated by a simple, room temperature and scalable radiolytic method can be used as a promising CE material for low-cost and high-performance DSSCs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Large Pt nanoparticles-decorated rGO sheet (L-Pt/rGO) was prepared by radiation γ-ray irradiation. </LI> <LI> L-Pt/rGO shows low sheet resistnace due to the reduced inter-sheet resistance. </LI> <LI> L-Pt/rGO with low Pt content exhibited the performance compable to that of Pt- counter electrode. </LI> <LI> Incoporation of small Pt nanoparticles on L-Pt/rGO can further increase the device-efficiency of DSSC. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>