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한국신·재생에너지학회> 신재생에너지> Co 및 Ti가 치환된 Layered perovskite의 SOFC 전극에 대한 적용성 연구

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Co 및 Ti가 치환된 Layered perovskite의 SOFC 전극에 대한 적용성 연구

Application of Layered Perovskites Substituted with Co and Ti as Electrodes in SOFCs

김찬규 ( Chan Gyu Kim ) , 신태호 ( Tae Ho Shin ) , 남중현 ( Jung Hyun Nam ) , 김정현 ( Jung Hyun Kim )
  • : 한국신·재생에너지학회
  • : 신재생에너지 18권2호
  • : 연속간행물
  • : 2022년 06월
  • : 40-49(10pages)
신재생에너지

DOI


목차

1. 서 론
2. 실험방법
3. 결과 및 고찰
4. 결 론
감사의 글
References

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In this study, the phase and electrochemical properties of Co and Ti substituted layered perovskites SmBaCo2-xTixO5+d (x=0.5, 0.7, 1.0, 1.1, 1.3, and 1.5) were analyzed, and their application as electrodes in solid oxide fuel cells (SOFCs) were evaluated. After calcination at 1300℃ for 6 h, a single phase was observed for two compositions of the SmBaCo2-xTixO5+d oxide system, SmBaCoTiO5+d (x=1.0) and SmBaCo0.9Ti1.1O5+d (x=1.1). However, the phases of SmBaCoTiO5+d (SBCTO) and SmTiO3 coexisted for compositions with x≥1.3 (Ti content). In contrast, for compositions of x≤0.7, the SmBaCo2O5+d phase was observed instead of the SmTiO3 phase. To evaluate the applicability of these materials as SOFC electrodes, the electrical conductivities were measured under various atmospheres (air, N2, and H2). SBCTO exhibited stable semi-conductor electrical conductivity behavior in an air and N2 atmosphere. However, SBCTO showed insulator behavior at temperatures above 600℃ in a H2 atmosphere. Therefore, SBCTO may only be used as cathode materials. Moreover, SBCTO had an area specific resistance (ASR) value of 0.140 Ω·cm2 at 750℃.

UCI(KEPA)

간행물정보

  • : 공학분야  > 화학공학
  • : KCI등재
  • :
  • : 계간
  • : 1738-3935
  • : 2713-9999
  • : 학술지
  • : 연속간행물
  • : 2005-2022
  • : 547


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저자 : 이승록 ( Seung-rok Lee ) , 한희 ( Hee Han ) , 장윤성 ( Yoon-seong Chang ) , 정한섭 ( Hanseob Jeong ) , 이수민 ( Soo Min Lee ) , 한규성 ( Gyu-seong Han )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 18권 3호 발행 연도 : 2022 페이지 : pp. 1-9 (9 pages)

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This study analyzed the anticipated supply-and-demand of forest biomass energy (through wood pellets) until 2050, in South Korea. Comparing the utilization rates of forest resources of five countries (United Kingdom, Germany, Finland, Japan, and S. Korea), it was found that S. Korea does not nearly utilize its forest resources for energy purposes. The total demand for wood pellets in S. Korea (based on a power generation efficiency of 38%) was predicted to be 3,629 and 4,371 thousand tons in 2034 and 2050, respectively. The anticipated total wood pellet power generation ratio to target power consumption is 1.13% (5,745 GWh), 1.17% (6,336 GWh), and 1.25% (7,631 GWh) in 2020, 2030, and 2050, respectively. Low value-added forest residues left unattended in forests are called “Unused Forest Biomass” in S. Korea. From the analysis, the total annual potential amount of raw material, sustainably collectible amount, and available amount of wood pellet in 2050 were estimated to be 6,877, 4,814, and 3,370 thousand tons, respectively. The rate of contribution to Nationally Determined Contributions was up to 0.64%. Through this study, the authors found that forest biomass energy will contribute to a carbon neutral society in the near future at the national level.

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저자 : 이승록 ( Seung-rok Lee ) , 박세훈 ( Sehun Park ) , 고문현 ( Moon-hyun Koh ) , 한규성 ( Gyu-seong Han )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 18권 3호 발행 연도 : 2022 페이지 : pp. 10-22 (13 pages)

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Forest biomass energy is based on scientific evidence in response to carbon neutrality and the climate crisis, international consensus, and environmental-geographic characteristics of each nation. In this study, the authors aimed to analyze macroscopic forest biomass energy policies for ten major countries. They categorized them into six detailed categories (Sustainable utilization, Cascading Uutilization, Replacement of fossil fuel/Carbon intensive products, Utilization of forest by-products/residues as the source of energy, Contribution to carbon-neutral/climate change, and Biomass combined with CCS/CCUS ). In addition, the surveyed nations have developed a policy consensus on the active use of forest biomass with sustainable forest management except for the cascading utilization category. Furthermore, the authors evaluated the mid to long-term plans of the Korean government for improvements in the policy and legal aspects. As a result, the authors derived four major directions that South Korea should approach strategically in the future (1) secure financial resources for sustainable forest management and stimulating investment in the timber industry, (2) promote unified policies to establish a bio-economy, (3) enhancement of the forest biomass energy system, and (4) reorganization and promotion of strategy centered on the opinions of field experts in internal and external instability.

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3식품부산물인 커피박과 폐식용유를 첨가제로 사용하여 파일럿 규모의 평다이 성형기로 제조한 리기다소나무 및 신갈나무 펠릿의 연료적 특성

저자 : 양인 ( In Yang ) , Xuanjun Jin , 한규성 ( Gyu-seong Han )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 18권 3호 발행 연도 : 2022 페이지 : pp. 23-31 (9 pages)

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This study evaluated the potential of coffee waste (CW) and used frying oil (UFO) as an additive in the production of pitch pine (PIP) and Mongolian oak (MOK) pellets. Ash contents obtained from CW and UFO were 0.5% and <0.1%, respectively. The calorific values of UFO (31.4 MJ/kg) and CW (26.3 MJ/kg) are higher than PIP (20.6 MJ/kg) and MOK (19.1 MJ/kg). For pellets fabricated using a pilot-scale flat-die pellet mill, regardless of fabricating conditions, moisture content (MC) and bulk density of PIP and MOK pellets satisfied the A1 wood pellet standard for residential and small-scale commercial uses, as designated by the National Institute of Forest Science (NIFOS) of the Republic of Korea. When CW was used as an additive, durability of PIP pellets made with 12%-MC sawdust and MOK pellets increased. The optimal conditions for producing PIP and MOK pellets could be by adding 20 mesh CW as an additive and the using of 12%-MC sawdust. However, durability of PIP pellets and ash content MOK pellets did not satisfy the A1 wood pellet standard of NIFOS. Thus, further research is needed to improve the properties of wood pellets with additives.

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발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 18권 3호 발행 연도 : 2022 페이지 : pp. 32-42 (11 pages)

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Rapid spread of intermittent renewable energy has amplified the instability and uncertainty of power systems. The Korea Power Exchange (KPX) promoted efficient management by opening the power brokerage market in 2019. By combining small-scale intermittent renewable energy with a flexible facility through the power brokerage market, the KPX aims to develop a virtual power plant system that will allow the conversion of existing intermittent renewable energy into collective power plants. However, the participation rate of renewable power owners in the power brokerage market is relatively low because other markets such as the small solar power contract market or the Korea Electric Power Corporation power purchase agreement are more profitable. In this study, we used a choice experiment to determine the attributes affecting the participation rate in the power brokerage market for 113 renewable power owners and estimate the value of the power brokerage market. According to the estimation results, a low smart meter installation cost, low profit variations, long contract periods, and few clearances increased the probability of participation. Moreover, the average value of the power brokerage market was estimated to be 2.63 million KRW per power owner.

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발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 18권 3호 발행 연도 : 2022 페이지 : pp. 43-59 (17 pages)

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The green premium is the most important feature of Korea's RE100 system. Green premium has three characteristics. The first, the cost of implementation is lower than that of other means of implementation. The second, it is linked with the RPS system to keep the means of implementing the green premium low. Third, the funds raised by the green premium are used to supply renewable energy to compensate for the additionality that the green premium does not have. When the entire industrial sector's electricity consumption is converted to renewable energy, the implementation cost of the green premium is estimated to be 3,377.4 billion won, and the REC purchase is estimated to incur the implementation cost of 6,576.4 billion won, which is 3.5 trillion more than the green premium. It was analyzed that an additional implementation cost of KRW 100 million would occur. In addition, in the case of solar PPA, it was analyzed that additional implementation costs of KRW 13,375.7 billion to KRW 16,162.3 billion were incurred. It was estimated that the renewable energy that could be supplied to the green premium would at least be sufficient for companies exporting to the US and EU. In addition, it was analyzed that when the fund created as a green premium is used for renewable energy supply, about 30.7% of the renewable energy supply through PPA can be supplied. However, as ESG is emphasized, green premium can be criticized by green washing because there is no additionality. There is also a limit to responding to the EU's CBAM. Therefore, companies can use the green premium depending on the situation, but it is more advantageous to use PPA, etc. The government needs to sufficiently maintain the supply of renewable energy using the fund to maintain the green premium.

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발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 18권 3호 발행 연도 : 2022 페이지 : pp. 60-71 (12 pages)

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발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 18권 3호 발행 연도 : 2022 페이지 : pp. 72-84 (13 pages)

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As the threat of climate change escalates, 'net-zero' has become a priority for the international community, and the use of new and renewable energy sources is expected to play a significant role in reaching international carbon neutrality. Here, we evaluate technological competitiveness in terms of implementation and technology by analyzing scientific literature and patents in the new and renewable energy fields of five major countries. For the past 10 years (2009-2019), the most active areas of new and renewable energy research and development have been solar power, wind power, waste, and fuel cells. China is the forerunner in implementation, whereas the United States has the most advanced technology. Portfolio analysis revealed that Korea's fuel cell, the United States' bioenergy, China's waste, Japan's solar and fuel cell, and the European Union's wind power have shown to be in Star Field respectively. Technological competitiveness analysis found that Korea is lagging behind other countries in the new and renewable energy sector, and needs to set a new direction for future carbon-neutral research and development, investment, and policy.

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7ESG(Environmental, Social, Governance)가 발전기업의 성과에 미치는 영향

저자 : 고병국 ( Byungguk Ko ) , 이규환 ( Kyuhwan Lee ) , 윤용범 ( Yongbeum Yoon ) , 박수진 ( Soojin Park )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 18권 2호 발행 연도 : 2022 페이지 : pp. 60-72 (13 pages)

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The environmental, social, and governance (ESG) score is gaining recognition as important nonfinancial investment criteria. With climate change emerging as a global issue, energy companies must pay attention to the ESG impact on corporate performance. In this study, the ESG impact on the performance of energy companies was analyzed based on 23 companies selected from the S&P 500. The panel corrected standard error methodology was used. The Refinitiv ESG score was the independent variable, and financial performance metrics, such as Tobin's Q, return on assets, and return on equity, were the dependent variables. It was found that the ESG score is positively associated with long-term corporate value but not with short-term profitability in the electricity utility industry. Among the subcategories of ESG, the environmental and social scores also showed positive correlations with long-term corporate value. A direct incentive policy is recommended that can offset expenses for ESG activities to reduce carbon emission in the energy sector.

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8이상유동 해석을 통한 브레이징 판형 응축기 설계 연구

저자 : 황대중 ( Dae-jung Hwang ) , 오철 ( Cheol Oh ) , 박상균 ( Sang-kyun Park ) , 지재훈 ( Jae-hoon Jee ) , 방은신 ( Eun-shin Bang ) , 이병길 ( Byeong-gil Lee )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 18권 2호 발행 연도 : 2022 페이지 : pp. 73-81 (9 pages)

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This study was aimed at designing a condenser, as a component of the organic Rankine cycle system for ships. The condenser was manufactured through press molding to achieve a bent shape to enhance the heat transfer performance, considering the shape of the heat transfer plate used in a brazing plate heat exchanger. The heat transfer plate was made of copper-nickel alloy. The required heat transfer rate for the condenser was 110 kW, and the maximum number of layers was set as 25, considering the characteristics of high-temperature brazing. Computational fluid dynamics techniques were used to perform the thermal fluid analysis, based on the ANSYS CFX (v.18.1) commercial program. The heat transfer rate of the condenser was 4.96 kW for one layer (width and length of 0.224 and 0.7 m, respectively) of the heat transfer exchanger. The fin efficiency pertaining to the heat transfer plate was approximately 20%. The heat flow analysis for one layer of the heat exchanger plate indicated that the condenser with 25 layers of heat transfer plates could achieve a heat transfer rate of 110 kW.

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9LNG FSRU의 재기화 공정에서 폐에너지회수시스템의 엑서지 분석

저자 : 한승현 ( Seoung Hyun Han ) , 조재호 ( Jae Ho Jo ) , 권정태 ( Jeong-tae Kwon ) , 박경우 ( Kyoungwoo Park ) , 최병철 ( Byung Chul Choi )

발행기관 : 한국신·재생에너지학회 간행물 : 신재생에너지 18권 2호 발행 연도 : 2022 페이지 : pp. 82-89 (8 pages)

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In this study, the exergy characteristics were analyzed, according to the mass flow rate of the propane working fluid and the pressure change in the turbine inlet, for the efficient recovery of cold energy and exhaust heat by the waste energy recovery system applied to the LNG FSRU regasification process. When the turbine inlet pressure and mass flow rate of the Primary Rankine Cycle were kept constant, the exergy efficiency and the net power increased. This occurred as the turbine inlet pressure and the mass flow rate of the working fluid increased in the Secondary Rankine Cycle, respectively, and the maximum values were confirmed. In this regard, the fluctuations in the exergy rate flowing into and out of the system and the exergy rate destroyed by pumps, evaporators, turbines, and LNG heat exchangers (condensers) were examined in detail.

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한국공업화학회 연구논문 초록집
2022권 0호

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40권 4호

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