• 제목/요약/키워드: carbon utilization

검색결과 622건 처리시간 0.028초

특허분석에 의한 탄소 나노재 수소저장 기술 동향 (Technology Trend for Carbon Nanomaterials Hydrogen Storage by the Patent Analysis)

  • 박수진;이영석;강경석;최미정;김종욱
    • 한국수소및신에너지학회논문집
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    • 제19권1호
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    • pp.77-89
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    • 2008
  • There are several materials for the hydrogen storage such as hydrogen storage alloy, carbon nanomaterials, non-carbon nanomaterials, compounds etc. Efficient and inexpensive hydrogen storage is an essential prerequisite for the utilization of hydrogen, one of the new and clean energy sources. Many researches have been widely performed for the hydrogen storage techniques and materials having high storage capacity and stability. In this paper, the patents concerning the carbon nanomaterial hydrogen storage method were gathered and analyzed. The search range was limited in the open patents of Korea(KR), Japan(JP), USA(US) and European Union(EP) from 1996 to 2006. Patents were gathered by using key-words searching and filtered by filtering criteria. The trends of the patents was analyzed by the years, countries, companies, and technologies.

특허분석에 의한 비탄소계 나노재료 수소저장 기술 동향 (Technology Trend for Non-carbon Nanomaterials Hydrogen Storage by the Patent Analysis)

  • 이진배;강경석;한혜정;김종욱;김해진
    • 한국수소및신에너지학회논문집
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    • 제19권3호
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    • pp.248-259
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    • 2008
  • There are several well-known materials for the hydrogen storage such as metallic alloy, carbon nanomaterials, non-carbon nanomaterials, and compounds etc. Efficient and inexpensive hydrogen storage methods are an essential prerequisite for the utilization of hydrogen, one of the new and clean energy sources. Many researches have been widely performed for the hydrogen storage techniques and materials to improve the high storage capacity and stability. In this paper, the patents concerning the non-carbon nanomaterial hydrogen storage method were collected and analyzed. The search range was limited in the open patents of Korea(KR), Japan(JP), USA(US) and European Union(EP) from 1996 to 2007. Patents were collected by using key-words searching and filtered by filtering criteria. The trends of the patents was analyzed by the years, countries, companies. and technologies.

Layer-by-layer assembled graphene oxide films and barrier properties of thermally reduced graphene oxide membranes

  • Kim, Seon-Guk;Park, Ok-Kyung;Lee, Joong Hee;Ku, Bon-Cheol
    • Carbon letters
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    • 제14권4호
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    • pp.247-250
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    • 2013
  • In this study, we present a facile method of fabricating graphene oxide (GO) films on the surface of polyimide (PI) via layer-by-layer (LBL) assembly of charged GO. The positively charged amino-phenyl functionalized GO (APGO) is alternatively complexed with the negatively charged GO through an electrostatic LBL assembly process. Furthermore, we investigated the water vapor transmission rate and oxygen transmission rate of the prepared (reduced GO $[rGO]/rAPGO)_{10}$ deposited PI film (rGO/rAPGO/PI) and pure PI film. The water vapor transmission rate of the GO and APGO-coated PI composite film was increased due to the intrinsically hydrophilic property of the charged composite films. However, the oxygen transmission rate was decreased from 220 to 78 $cm^3/m^2{\cdot}day{\cdot}atm$, due to the barrier effect of the graphene films on the PI surface. Since the proposed method allows for large-scale production of graphene films, it is considered to have potential for utilization in various applications.

연료전지 전극 반응을 위한 카본 담지 표면 합금의 전기촉매 활성 (Electrocatalytic activity of carbon-supported near-surface alloys (NSAs) for electrode reaction of fuel cell)

  • 박인수;성영은
    • 신재생에너지
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    • 제2권4호
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    • pp.64-69
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    • 2006
  • There is a worldwide interest in the development and commercialization of polymer electrolyte membrane fuel cells [PEMFCs] for vehicular and stationary applications. One of the major objectives is the reduction of loaded electrode materials, which is comprise of the Pt-based noble metals. In this paper, a novel chemical strategy is described for the preparation and characterization of carbon-supported and surface-alloys, which were prepared by using a successive reduction process. After preparing Au colloid nanoparticles, the supporting of Au colloid nanoparticles occurred spontaneously in the carbon black-dispersed aqueous solution. Then nano-scaled active materials were formed on the surface of carbon-supported Au nanoparticles. The structural and electrochemical analyses indicate that the active materials were deposited on the surface of Au nanoparticles selectively and that an alloying process occurred during the successive reducing process. The carbon-supported & surface-alloys showed the higher electrocatalytic activity than those of the particle-alloys and commercial one [Johnson-Matthey] for the reaction of methanol and formic acid oxidation. The increased electrocatalytic activity might be attributed to the effective surface structure of surface-alloys, which have a high utilization of active materials for the surface reaction of electrode.

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Studies on Enhanced Oxidation of Estrone and Its Voltammetric Determination at Carbon Paste Electrode in the Presence of Cetyltrimethylammonium Bromide

  • Yang, Chunhai;Xie, Pingping
    • Bulletin of the Korean Chemical Society
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    • 제28권10호
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    • pp.1729-1734
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    • 2007
  • The electrochemical behaviors of estrone in the presence of various surfactants were examined with great details. It is found that a cationic surfactant, cetyltrimethylammonium bromide (CTAB), obviously facilitates the electro-oxidation of estrone at carbon paste electrode (CPE) from the significant peak current enhancement and the negative shift of peak potential. Additionally, chronocoulometry and electrochemical impedance spectroscopy (EIS) were also used for further investigation of the electrode process of estrone, indicating that low concentration of CTAB exhibits excellent enhancement effects on the electrochemical oxidation of estrone, greatly enhances the diffusion coefficient and the electron transfer rate. Based on this, an electrochemical method was proposed for the determination of estrone. The oxidation peak current is proportional to the concentration of estrone in the ranges over 9.0 × 10?8 - 8.0 × 10?6 mol/L, and a low detection limit of 4.0 × 10?8 mol/L was obtained for 180s accumulation at open circuit (S/N = 3). Finally, this proposed method was demonstrated using estrone tablets with good satisfaction.

카본 나노재료 합성을 위한 표면파 플라즈마 CVD 기술 (Surface wave excited plasma CVD technologies for the synthesis of carbon nanomaterials)

  • 김재호
    • 진공이야기
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    • 제2권4호
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    • pp.16-26
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    • 2015
  • Carbon nanomaterials including nanocrystalline diamond and graphene films are expected to play a core role in $21^{st}$ century industries due to their amazing physicochemical properties. To achieve their practical utilization and industrialization, the development of their mass production technologies is strongly required. Recently, a surface wave excited plasma (SWP) which is produced using microwaves has been attracting special attentions as a candidate for the mass production technology of carbon nanomaterials. SWP can allow a low-temperature large-area plasma chemical vapor deposition (CVD) system. Here, this article introduces the promising SWP-CVD technology. Plasma characteristics in a SWP will be introduced in detail to help understanding how to use and control a SWP as a plasma source for CVD applications.

메탄가스 분리용 탄소분자체 특성 연구 (Characterization of Carbon Molecular Sieve for Separating CH4 Gas)

  • 이범석;김택남;김윤종
    • 한국재료학회지
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    • 제14권2호
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    • pp.157-162
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    • 2004
  • The object of this research is to develop a carbon molecular sieve(below CMS) which can separate selectively to convert mixture gases spout at waste landfill into fuel. And this research is meaningful from the viewpoint of a quality improvement of CH$_4$ gas and an utilization of by-product. CMS was prepared using coconut shell powder as starting material and the effects of activators, temperature and modifier on the reaction were investigated in this research. Also, pore diameter, surface area of CMS and adsorption rate were measured and studied by cahn balance and ASAP2010. Its specific surface area and pore distribution were controlled easily at 800^{\circ}C and adsorption rate was very good. The CMS prepared in this research is shown to be able to separate landfill gases very effectively.

열선을 이용한 혼합기체의 농도와 유량의 측정 (Measurement of Gas Concentration and flow Rate Using Hot Wire)

  • 김영한;최종정
    • 제어로봇시스템학회논문지
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    • 제8권5호
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    • pp.407-412
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    • 2002
  • A measurement device for gas concentration and flow rate using hot wire is developed for the utilization in industrial applications. The device has two cells of measuring and reference, and a bridge circuit is installed to detect electric current through the hot wire in the cells. An amplification of the signal and conversion to digital output are conducted for the on-line measurement with a personal computer. The flow rate of air and carbon dioxide gas is separately measured for the performance examination of the device. Also, the concentration of air-carbon dioxide and carbon dioxide-argon mixtures is determined for the same evaluation. The outcome of the performance test indicates that the accuracy and stability of the device is satisfactory for the purpose of industrial applications.

국제민간항공분야의 기후변화 대응 전략 연구 (Strategies for International Aviation to Respond to Climate Change)

  • 유광의
    • 한국기후변화학회지
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    • 제9권4호
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    • pp.313-318
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    • 2018
  • The growth rate of international aviation is expected to be higher than that of most industries and the proportion of carbon emissions from the aviation industry will become very significant as the year 2050 approaches. Constraining the growth of this industry is not desirable because it is essential for human welfare as well as the development of related industries. However, reduction of carbon due to aviation is not easy because it is difficult to improve fuel efficiency in a significant way. The ICAO (International Civil Aviation Organization), which is the main organization responsible for handling this problem, developed a program named CORSIA (Carbon Offsetting and Reduction Scheme for International Aviation). The present study analyzes various strategies for countries and airlines to comply with CORSIA using a fuel-efficient system. We conclude that countries should improve their airspace utilization systems, airport facilities, and air navigation systems. Additionally, based on the results of a flight data analysis, airlines should improve their operational efficiency in terms of operations control, flight operation, and maintenance management.

폐유리와 모래를 활용한 Wollastonite 합성 예비 실험 (Feasibility Study on the Synthesis of Wollastonite Using Waste Glass and Sand)

  • 배준일;권민경;문주혁
    • 시멘트 심포지엄
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    • 통권49호
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    • pp.23-24
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    • 2022
  • Wollastonite는 대표적인 이산화탄소 반응경화 물질로서 이산화탄소와 직접적으로 반응하여 탄산칼슘과 실리카겔을 형성한다. 따라서 이는 의심의 여지 없이 이산화탄소 저장 및 활용에 사용될 수 있는 핵심적인 기술이다. 본 연구에서는 실리카 원료로서 고가의 실리카퓸을 대체하기 위해 모래와 폐유리를 사용하여 실험해 보았다.

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