• Composites Research
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• 제37권4호
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• pp.286-290
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• 2024

The rapid increase in the demand for energy has put huge pressure on fossil fuels. The continuous overutilization of these existing non-renewable energy sources has been causing severe environmental concerns. In these regards, electrochemical water splitting has gained huge attention for producing green hydrogen, a superior energy source with high gravimetric energy density (120 MJ/kg), as compared with conventional options. Electrochemical water splitting is a viable option for generating green hydrogen. However, the various limitations of state-of the art Pt/C and RuO₂- based electrocatalysts has motivated the scientific community to develop novel cathode (hydrogen evolution reaction (HER)) and anode (oxygen evolution reaction (OER)) electrocatalysts. In our present study, we have achieved a new milestone by fabricating the NiMo-based transition metal LDHs coupled V₂C MXene support based heterocatalyst. The synergistic impact of NiMo LDHs (corrosion resistance, favorable intrinsic catalytic properties, etc.) and V₂C (high electrical conductivity, pseudocapacitive behavior, etc.) has resulted in the HER and OER at smaller overpotential of 135 and 370 mV at the current density of 10 and 30 mA cm-2 in an alkaline (1.0 M KOH) environment.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제42회 동계 정기 학술대회 초록집
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• pp.588-588
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• 2012

Zn-doped $TiO_2$ mesoporous microspheres with high photocatalytic activity were synthesized via combined sol-gel and solvothermal methods for photocatalytic water splitting. It is found that the photocatalytic water splitting and photocatalytic degradation activity can be enhanced by doping an appropriate amount of Zn. Our results reveal that Zn doping inhibits the recombination of photo-generated charge carriers of $TiO_2$ and improves the probability of photo-generated charge carrier separation and hence the photocatalytic activity of $TiO_2$.

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
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• pp.1122-1123
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• 2006

Mn-Fe oxide and Mn-Fe oxide/$ZrO_2$(50wt%/50wt%) were prepared by ball milling method. XRD data of the prepared samples revealed that hematite and ferrite phase coexisted. Water splitting at 1273K, after thermal reduction at 1573K, was performed 4 times for the samples. Hydrogen production amount was analyzed by GC with TCD detector. Water splitting capacity of Mn-Fe oxide was improved by ball milling with $ZrO_2$.

• 한국수소및신에너지학회논문집
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• 제18권4호
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• pp.356-364
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• 2007

The partial reduction and water splitting properties of metal substituted ferrite mediums for two-step thermochemical hydrogen production, were carried out by TPR/O(Temperature programmed reduction/oxidation) method at a temperature of below 1173 K and under atmospheric pressure. $ZrO_2$ was added to the ferrite as a binder to prevent the sintering. As the results, the reactivity of the metal species added to the ferrite mediums decreased in the order of Cu>Co>Ni>Mn, on the basis of water-splitting temperature. It was also found that the produced hydrogen amounts in the water-splitting step on partial reduced mediums were corresponding to the consumed hydrogen amounts in the previously partial reduction step.

• 전기화학회지
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• 제24권2호
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• pp.13-27
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• 2021

스테인레스 강은 지구상에서 가장 널리 사용되고 있는 철의 합금으로 니켈과 크롬을 포함하여 높은 내부식성을 가지고 있어 구조용 강재로 사용하기 매우 적합하다. 또한, 최근에는 스테인레스 강에 포함된 철과 니켈의 고유 특성을 이용하여 다양한 고기능성 촉매나 지지체, 또는 전극의 집전체 등으로의 응용 연구가 다양하게 이루어지고 있다. 특히, 높은 촉매 특성으로 인해 수전해 전극으로의 응용을 위한 스테인레스 강의 표면에서의 활성화 표면 처리 연구가 많이 이루어지고 있다. 이에 본 총설은 수전해 전극 응용을 위한 스테인레스 강의 수전해 전극 응용 표면처리 기술 자료를 정리 및 요약하였으며, 스테인레스 강의 표면처리 방법에 대한 특징 및 이를 통해 스테인레스 강이 저비용 고효율의 수전해 전극 활용을 위한 촉매 물질로써 응용될 수 있는 여러 방법을 제시하였다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제45회 하계 정기학술대회 초록집
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• pp.251.2-251.2
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• 2013

Natural photosynthesis utilizes two proteins, photosystem I and photosystem II, to efficiently oxidize water and reduce NADP+ to NADPH. Artificial photosynthesis which mimics this process achieve water splitting through a two-step Z-schematic water splitting process using man-made synthetic materials for hydrogen fuel production. In this study, Z-scheme system was achieved from the hybrid materials which composed of hydrogen production part as photosystem I protein and water oxidizing part as semiconductor BiVO4. Utilizing photosystem I as the hydrogen evolving part overcomes the problems of existing hydrogen evolving p-type semiconductors such as water instability, expensive cost, few available choices and poor red light (>600 nm) absorbance. Some problems of photosystem II, oxygen evolving part of natural photosynthesis, such as demanding isolation process and D1 photo-damage can also be solved by utilizing BiVO4 as the oxygen evolving part. Preceding research has not suggested any protein-inorganic-hybrid Z-scheme composed of both materials from natural photosynthesis and artificial photosynthesis. In this study, to realize this Z-schematic electron transfer, diffusion step of electron carrier, which usually degrades natural photosynthesis efficiency, was eliminated. Instead, BiVO4 and Pt-photosystem I were all linked together by the mediator gold. Synthesized all-solid-state hybrid materials show enhanced hydrogen evolution ability directly from water when illuminated with visible light.

• 전기화학회지
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• 제20권1호
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• pp.18-25
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• 2017

본 총설에서는 최근 전세계적으로 각광 받고 있는 유기 금속 할라이드 페로브스카이트 소재에 기반한 태양광 물분해 연구에 대해 정리하였다. 크게, 현재까지 연구보고들을 태양전지-전기분해기 구성 (photovoltaic-electrolyzer configuration) 및 통합 태양광 물분해 (integrated photoelectrolysis)로 분류하여 최근 연구결과들을 소개하였다. 해당 분야 연구는 아직 초기 단계에 있으며, 향후 효과적인 보호막 개발, 고전압 텐덤전지 제작 등이 필요함을 보였다.

• 한국진공학회지
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• 제18권5호
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• pp.331-336
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• 2009

본 고에서는 광전기화학적 수소 ($H_2$) 발생 전지의 연구 개발 현황을 소개한다. 이를 통해 water-splitting 전지의 기본 원리를 이해하고 기술적 문제점 및 국내외 연구 현황, 향후 개발 동향 등을 살펴본다.

• 한국막학회:학술대회논문집
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• 한국막학회 2003년도 추계 총회 및 학술발표회
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• pp.25-33
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• 2003

원자력 발전의 고온 가스로(high temperature gas-cooled reactor, HTGR)의 냉각제로 사용되는 He가스의 폐열에너지를 이용하여 물을 분해해서 수소를 생산하는 “열화학적 수소제조 IS프로세스”에서의 분리막 기술의 응용에 대해 정리하였다. 고온 원자력 열에너지를 이용한 열화학적 수소 제조법은 실현 가능한 단계까지 왔다고 생각되며, 아직 연구 개발 과제가 많이 남아 있지만, 미래의 청정에너지 중의 하나인 수소를 대량 생산할 수 있는 가능성을 갖고 있다.

• 마이크로전자및패키징학회지
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• 제26권4호
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• pp.107-111
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• 2019

We report the fabrication of a CdS/CuInGaSe (CdS/CIGS) structure with carbon nanotubes and its application as a photocathode for photoelectrochemical water splitting. CIGS thin films were fabricated using co-evaporation by RF magnetron sputtering, while CdS was fabricated by chemical bath deposition. Spray coated multi-wall carbon nanotube (CNT) film on CdS/CIGS thin film was investigated as a photocathode. The CNT-coated CdS/CIGS showed superior photocurrent density and exhibited improved photostability.