• 한국수소및신에너지학회논문집
• /
• 제22권4호
• /
• pp.559-567
• /
• 2011

This paper deals with an economic evaluation of domestic low-temperature water electrolysis hydrogen production. We evaluate the economic feasibility of on-site hydrogen fueling stations with the hydrogen production capacity of 30 $Nm^3/hr$ by the alkaline and the polymer electrolyte membrane water electrolysis. The hydrogen production prices of the alkaline water electrolysis, the polymer electrolyte membrane water electrolysis, and the steam methane reforming hydrogen fueling stations with the hydrogen production capacity of 30 $Nm^3/hr$ were estimated as 18,403 $won/kgH_2$, 22,945 $won/kgH_2$, 21,412 $won/kgH_2$, respectively. Domestic alkaline water electrolysis hydrogen production is evaluated as economical for small on-site hydrogen fueling stations, and we need to further study the economic evaluation of low-temperature water electrolysis hydrogen production for medium and large scale on-site hydrogen fueling stations.

• 전기화학회지
• /
• 제26권2호
• /
• pp.19-34
• /
• 2023

Due to the intermittency of renewable energy sources, a need to store and transport energy will increase. Hydrogen production through water electrolysis will provide an excellent way to supplement the intermittency of renewable energy sources. While alkaline water electrolysis is currently the most mature technology, it has drawbacks of low current density, large footprint, gas crossover, etc. The PEM water electrolysis has potential to replace the alkaline electrolysis. However, expensive catalyst material used in the PEM electrolysis has been the bottleneck of widespread use. In this review, we have reviewed recent efforts to reduce catalyst loading in PEM water electrolysis. In core-shell nanostructures, the precious metal catalyst forms a shell while heteroatoms form a core. In this way, the catalyst loading can be significantly reduced while maintaining the catalytic activity. In another approach, a corrosion-resistant support is utilized, which provides a stable platform to impregnate precious metal catalyst.

• 한국수소및신에너지학회논문집
• /
• 제34권6호
• /
• pp.575-580
• /
• 2023

An electrode was prepared by dip-coating NiFe₂O₄ powder on stainless steel (SUS) support for the application in the alkaline water electrolysis. The prepared electrode was analyzed using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDXS), and was evaluated for the voltage properties with the change of current density in oxygen evolution reaction (OER) and hydrgen evolution reaction (HER) using 1, 3 and 7 M KOH solution. From the SEM and EDXS analysis, it was confirmed that the prepared electrode had NiFe₂O₄ on the SUS support. In OER and HER, the voltage in the 7 M KOH solution had a value of 1.35 and -1.90 V at 0.2 and -0.2 A/cm² of the current density, respectively. It was considered that the prepared electrode could be use as an electrode in the alkaline water electrolysis from the experimental results.

• 공업화학
• /
• 제30권4호
• /
• pp.389-398
• /
• 2019

수소에너지는 화석연료의 사용으로 인해 나타나는 기후변화의 문제를 해결할 수 있는 방안일 뿐 아니라 산업용 전력 생산, 자동차용 연료 등을 위한 대체가능한 에너지로 인식되고 있다. 수소제조 방법 중 물의 전기분해를 이용한 방법이 가장 효율적이고 실용적인 방법으로 여겨지고 있으며, 수소를 물로부터 직접 제조하는 방법은 화석연료 이용 제조 방법과 비교하여 보았을 때 지구환경 오염물질인 메탄, 이산화탄소 등의 배출이 없다. 본 총설은 수소제조 방법 중 하나인 물 전기분해의 종류인 알칼리 수전해(alkaline water electrolysis, AWE), 고분자전해질막 수전해(polymer electrolyte membrane water electrolysis, PEMWE)에 대해서 분석하고 최근 연구 중인 탄화수소 전해질막의 동향 및 전해질막의 문제점인 크로스오버현상에 대해 설명하였다.

• 한국수소및신에너지학회논문집
• /
• 제33권1호
• /
• pp.55-60
• /
• 2022

As interest in sustainable and eco-friendly energy sources is increasing due to various problems in the carbon society, a hydrogen economy using hydrogen as a main energy source is emerging. While the natural gas reforming method generates carbon dioxide, the water electrolysis method based on renewable energy is eco-friendly. The water electrolysis device currently being developed uses a 2 Nm³/hr class alkaline aqueous solution as an electrolyte and produces hydrogen based on renewable energy. In this study, risk assessment was conducted for these water electrolysis devices

• 공업화학전망
• /
• 제24권4호
• /
• pp.1-21
• /
• 2021

화석연료의 과도한 사용으로 유발된 기후변화 문제를 해결하기 위해 대체에너지의 개발에 대한 관심이 높아지고 있는 가운데 재생가능하며 친환경적인 수소에너지가 실현가능한 궁극적 대안으로 주목받고 있다. 다양한 수소 생산 기술 중 물의 전기분해를 이용한 수전해 기술은 온실가스와 같은 오염물질을 배출하지 않으며 재생에너지와 연계하여 미이용 전력을 대용량 장주기로 저장할 수 있다는 장점이 있다. 수전해 장치는 수소와 산소를 발생하는 전극과 기체의 섞임을 방지하고 이온을 전달하는 분리막으로 구성되며 그 중 분리막은 수전해 장치의 효율과 안정성을 결정짓는 핵심 부품이다. 본 총설에서는 수전해 기술 중 저온 수전해에 해당하는 알칼라인 수전해(alkaline water electrolysis), 고분자전해질막 수전해(polymer electrolyte membrane water electrolysis)와 음이온교환막 수전해(anion exchange membrane water electrolysis)에 사용되는 분리막에 대한 특성을 분석하고 최근 연구 동향에 대해서 다루고자 한다.

• 한국수소및신에너지학회논문집
• /
• 제23권2호
• /
• pp.117-124
• /
• 2012

Alkaline electrolysis needs the electrode having a low overvoltage and good corrosion resistance in alkaline solution such as KOH and NaOH, for the oxygen and hydrogen production. The commercial materials such as SUS(stainless steel)-316, Ni and NiFe were evaluated for the electrode in alkaline electrolysis. The test solution for the alkaline electrolysis used 1~9M NaOH and 1~9M KOH. The voltage increased with an increase of current density in each solution. As for the 15wt.% (about 5M) NaOH, the voltage of the tested electrode under the current density of 1.8A/$cm^2$ showed the almost same value. The voltage over the current density of 1.8A/$cm^2$ deceased in the order: Ni${\fallingdotseq}$NiFe$cm^2$ showed the almost same value. The voltage over the current density of 1.8A/$cm^2$ deceased in the order: NiFe${\fallingdotseq}$SUS-316. From the results, it was estimated that NiFe and Ni was suitable as the electrode for the alkaline water electrolysis using NaOH and KOH electrolyte.

• 한국수소및신에너지학회논문집
• /
• 제15권4호
• /
• pp.324-332
• /
• 2004

According to the rapid depletion of the fossil fuels, the electricity and hydrogen will gradually take charge of the future energy supply. Especially, in order to control the supply and demand of electricity, energy storage medium is necessary and this could be solved by the combination of water electrolysis and fuel cell. Although electricity can be generated from such alternative energies as hydropower, nuclear, solar, and wind-power resources, alternative energy storage medium is also required since regenerative energies, solar and wind-powers, are intermittent energy resources. In this regard, hydrogen production from water electrolysis was recognized as a superb method for electricity storage. In this work, the current development and economic status of alkaline, solid polymer, and high temperature electrolysis were reviewed, and then the practical use of water electrolysis technology were discussed.

• 한국수소및신에너지학회논문집
• /
• 제34권6호
• /
• pp.722-727
• /
• 2023

There are various types of hydrogen production methods, but among them, the alkaline water electrolysis method produces hydrogen by electrolyzing water, and unlike other methods, it can produce green hydrogen that does not emit pollutants and greenhouse gases. There are many different potential risk factors inherent in the water electrolysis process. So it is necessary to predict an emergency situation in advance and to safely manage and take countermeasures according to the emergency situation. Korea Gas Safety Corporation (KGS) CODE AH271 stipulates legal matters to secure safety, but it is not detalied. Thus it is necessary to take measures to safely control and manage it according to the situation in which an emergency stop is required. In this study, based on KGS CODE and HAZOP for alkaline water electrolysis facilities, factors that can cause emergency situations were derived and countermeasures were prepared.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2023년도 봄 학술논문 발표대회
• /
• pp.135-136
• /
• 2023

In this study, a concrete was prepared using an alkaline aqueous solution produced by electrolyzing potassium carbonate in order to improve the low initial strength of concrete using blast furnace slag. In order to confirm the increase in initial strength, the compressive strength of specimens was measured on the age of 7, 28 days. As a result, the blast furnace slag concrete using the electrolysis alkaline aqueous solution as the mixed water show high strength more than the blast furnace slag concrete using the general mixed water.