• 한국세라믹학회지
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• 제52권5호
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• pp.338-343
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• 2015

To prevent an interfacial reaction between the anode and the electrolyte layer during the conventional high-temperature co-firing process, an anode-supported type cell with a thin-film electrolyte was fabricated by low-temperature ceramic thick film coating process. Ni-GDC cermet composite was used as the anode material and YSZ was used as the electrolyte material. Open circuit voltage and maximum power density were found to strongly depend on the surface uniformity of the anode functional layer. By optimizing the microstructure of the anode functional layer, the open circuit voltage and maximum powder density of the cell increased to 1.11 V and $1.35W/cm^2$, respectively, at $750^{\circ}C$. When a GDC barrier layer was applied between the YSZ electrolyte and the LSCF cathode, the cell showed good stability, with almost no degradation up to 100 h. Anode-supported type SOFCs with high performance and good stability were fabricated using a coating process.

• Journal of Electrochemical Science and Technology
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• 제13권1호
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• pp.32-53
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• 2022

Although lithium-ion batteries are currently the most reliable power supply system for various mobile applications, further improvement in energy density is still required as the need for batteries in large energy-consuming devices is rapidly growing. However, in the anode, the most widely commercialized graphite-based anode materials almost face theoretical limitations. In addition, sodium-ion batteries have been actively studied to replace expensive charge carriers with cheaper ones. Accordingly, conversion-based materials have been extensively studied as high-capacity anode materials in both lithiumion batteries and sodium-ion batteries because their theoretical capacity is twice or thrice higher than that of insertion-based materials. This review will provide a comprehensive understanding of conversion-based materials, including basic charge storage behaviors, critical drawbacks that should be overcome, and practical material design for high-performance.

• 한국재료학회지
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• 제10권10호
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• pp.659-664
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• 2000

연료극 지지체식 원통형 고체산화물 연료전지를 개방하기 위해 연료극 지지체와 전해질이 코팅된 연료극 원통관의 제조 및 그것의 특성에 대해 연구하였다- 연료극 지지체는 20-50vol.%의 탄소함량에 따라 만들어졌으며, 탄소량이 증가함에 따라 연 료극 지지체의 기공율도 점차 증가하였으며, 적절한 기공율을 가지기 위한 최적 탄소량은 30vol.%임을 확인하였다. 연료극 지지체 관은 압출법으로 제작하였으며, 전해질은 슬러리 코팅법으로 원통판의 바깥쪽에 코팅하였고, $1400^{\circ}C$에서 공소결을 성공적으로 실시하였다. 소결후 물리척특성과 미세구조를 조사하였으며, 연료극 지지체관의 기공율은 35%이었고 연료전지의 요구조건을 만족하였다. 기체투과율 시험을 통하여, 연료극 지지체관 자체는 충분히 다공성을 나타내었으나, 전해질층을 코팅한 경우에는 매우 낮은 기체부과율을 나타냄을 확인하였다. 이것은 코팅된 전해질층이 매우 치밀하다는 것을 의미하며, 본 연구를 통해서 연료극 지지체식 원통형 고체산화물 연료전지가 제조될 수 있음을 확인하였다.

• 공업화학
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• 제34권3호
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• pp.226-240
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• 2023

This paper provides an overview of the trends and future directions in the development of anode materials for solid oxide fuel cells (SOFCs) using hydrocarbons as fuel, with the aim of enabling a decentralized energy supply. Hydrocarbons (such as natural gas and biogas) offer promising alternatives to traditional energy sources, as their use in SOFCs can help meet the growing demands for energy. We cover several types of materials, including perovskite structures, high-entropy alloys, proton-conducting ceramic materials, anode on-cell catalyst reforming layers, and anode functional layers. In addition, we review the performance and long-term stability of cells based on these anode materials and assess their potential for commercial manufacturing processes. Finally, we present a model for enhancing the applicability of fuel cell-based power generation systems to assist in the realization of the H₂ economy as the best practice for enabling distributed energy. Overall, this study highlights the potential of SOFCs to make significant progress toward a sustainable and efficient energy future.

• 한국세라믹학회지
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• 제51권4호
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• pp.357-361
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• 2014

An Ni-Fe/YSZ core-shell structured anode for uniform microstructure and catalytic activity was synthesized. Flat tubular segmented-in-series solid oxide fuel cell-stacks were prepared by decalcomania method using synthesized anode powder. The Ni-Fe/YSZ core-shell anode exhibited better electrical conductivity than a commercially available Ni-YSZ cermet anode. Also power output increased by 1.3 times with a higher open circuit voltage. These results can be attributed to the uniformly distributed Ni particles in the YSZ framework. The impedance spectra of a Ni-Fe/YSZ core-shell anode showed comparable reduced ohmic resistance similar to those of the commercially available Ni-YSZ cermet anodes.

• Korean Chemical Engineering Research
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• 제56권4호
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• pp.561-567
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• 2018

본 연구에서는 리튬이온전지 실리콘 음극소재의 사이클 안정성 향상을 위해 실리콘/탄소 음극소재의 전기화학적 특성을 조사하였다. Tetraethyl orthosilicate (TEOS) 로부터 스토버법 및 마그네슘 열 환원법을 통하여 다공성 실리콘을 제조하고, 제조된 다공성 실리콘과 피치의 질량비에 따라 실리콘/탄소 음극소재를 제조하였다. 실리콘/탄소 음극소재의 물리적 특성은 XRD와 TGA를 통해 분석하였다. 1.0 M $LiPF_6$ (EC : DEC = 1 : 1 vol%) 전해액에서 실리콘/탄소 음극소재의 충 방전 사이클, 율속, 순환전압전류, 임피던스 테스트를 통해 전기화학적 특성을 조사하였다. 제조된 실리콘/탄소 음극소재 실리콘 : 탄소 = 5 : 95 일때 453 mAh/g의 향상된 용량을 나타내었으며, 사이클 성능 또한 두 번째 사이클 이후 30 사이클까지 매우 우수한 사이클 안정성을 나타냄을 확인하였다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2009년도 춘계학술대회 논문집
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• pp.392-394
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• 2009

Direct Carbon Fuel Cells (DCFCs) generates electricity directly converting the chemical energy in coal. In the present study, effects of anode and current collector materials on the power density of DCFC are investigated experimentally. The adopted DCFC system is combined type of solid oxide fuel cells (SOFC) and molten carbonate fuel cells (MCFC) with the use of a liquid-molten salt anode and a solid oxide electrolyte, proposed by SRI. Power densities of 25 mm button cells with various combination of anode materials and current collector materials are measured.

• Journal of Electrochemical Science and Technology
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• 제13권3호
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• pp.398-406
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• 2022

To satisfy the growing demand for high-performance batteries, diverse novel anode materials with high specific capacities have been developed to replace commercial graphite. Among them, cobalt hydroxides have received considerable attention as promising anode materials for lithium-ion batteries as they exhibit a high reversible capacity owing to the additional reaction of LiOH, followed by conversion reaction. In this study, we introduced graphene in the fabrication of Co(OH)₂-based anode materials to further improve electrochemical performance. The resultant Co(OH)₂/graphene composite exhibited a larger reversible capacity of ~1090 mAh g^-1, compared with ~705 mAh g^-1 for bare Co(OH)₂. Synchrotron-based analyses were conducted to explore the beneficial effects of graphene on the composite material. The experimental results demonstrate that introducing graphene into Co(OH)₂ facilitates both the conversion and reaction of the LiOH phase and provides additional lithium storage sites. In addition to insights into how the electrochemical performance of composite materials can be improved, this study also provides an effective strategy for designing composite materials.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1991년도 하계학술대회 논문집
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• pp.255-258
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• 1991

MCFC are expected as an electric and thermal power source of the urban cogenerating system because MCFC have higher electric power efficiency and better thermal power quality. However, the MCFC which use strorgly corrosive molten Carbonate at $650^{\circ}C$ have many problems. Material issues with the molten carbonate fuel cell in clude anode creep, conthode dissolution and bipolar plate corrosion. The objectives of this study are to examied fabrication process and characteristics of anode electrode.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2007년도 추계학술발표대회 및
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• pp.77.1-77.1
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• 2007