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나노기공성 물질을 이용한 메탄개질 및 수소분리용 연속반응시스템 설계 및 평가
배종수(Bae, Jong-Soo),박주원(Park, Joo-Won),김재호(Kim, Jae-Ho),이재구(Lee, Jae-Goo),최영찬(Choi, Young-Chan),한춘(Han, Choon) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
아직까지 국내에서 사용하는 대부분의 에너지는 화석연료에 의존하고 있다. 지하자원에서 나오는 석탄, 석유와 같은 화석연료는 다른 에너지원에 비해 운송이 간편하고 쉽게 이용할 수 있는 장점이 있지만, 환경오염의 문제성과 오일가상승, 자원의양 및 저장장소가 한정되어 있다는 단점을 가지고 있다. 이에 따라 수소와 같은 대체에너지를 이용하여 환경오염을 예방하고 무한히 사용할 수 있는 에너지원을 개발하기 위한 대체 방안들이 연구되고 있다. 폐기물 가스화시 발생되는 합성가스(CO, CO₂, CH₄, H₂) 내 일차로 생성된 일산화탄소는 수증기와 반응함으로써 이산화탄소로 전환이 가능하다. 잔류 메탄은 이산화탄소를 이용하여 개질함으로써 합성가스내 수소농도를 높일 수 있다. 전환된 잔류가스(CO, CO₂, H₂)내 일산화탄소는 산소를 이용하여 이산화탄소로 산화시킬 수 있으며, 산화된 이산화탄소는 흡착제를 이용하여 제거가 가능하다. 본 연구에서는 실제 가스화시 발생되는 합성가스를 이용하기 위하여, RPF가스화시 발생되는 합성가스를 직접 포집하여 실험을 진행하였다. 합성가스내 소량의 메탄은 니켈촉매를 이용하여 수소로 전화시켰으며, 잔류하는 일산화탄소는 백금촉매, 이산화탄소는 탄산나트륨 흡착제를 이용하여 연속적으로 제거함으로써 순수한 수소를 제공하였다.
Ni-Pt 나노 촉매의 혼합비가 음이온 교환막 수전해 특성에 미치는 영향
노립신,대관하,이재영,이홍기 한국수소및신에너지학회 2021 한국수소 및 신에너지학회논문집 Vol.32 No.5
To study the effect of the mixture ratio of Ni-Pt nanocatalysts on water electrolysis characteristics in anion exchange membrane system, Ni-Pt nanocatalysts were loaded on carbon black by using a spontaneous reduction reaction of acetylacetonate compounds. The loading weight of Ni-Pt nanocatalysts on the carbon black was measured by thermogravimetric analyzer and the elemental ratio of Ni and Pt was estimated by energy dispersive x-ray analyzer. It was found that the loading weight of Ni-Pt nanoparticles was 5.36-5.95 wt%, and the loading weight increased with increasing Pt wt%. As the Ni-Pt loading weight increased, the specific surface area decreased, because Ni-Pt nanoparticles block the pores of carbon black. It was confirmed by BET analysis and dynamic vapor sorption analysis. I–V characteristics were estimated.
음이온 교환막 수전해용 Fe-Ni-Pt 나노촉매 제조 및 특성
이재영,이홍기 한국수소및신에너지학회 2023 한국수소 및 신에너지학회논문집 Vol.34 No.5
Fe-Ni-Pt nanocatalysts were loaded on carbon black powders which were synthesized by a spontaneous reduction reaction of iron (II) acetylacetonate, nickel (II) acetylacetonate and platinum (II) acetylacetonate. The morphology and the loading weight of Fe-Ni-Pt nanoparticles were characterized by transmission electron microscopy and thermogravimetric analyzer. The amount of Fe-Ni-Pt catalyst supported on the carbon black surface was about 6.42-9.28 wt%, and the higher the Fe content and the lower the Pt content, the higher the total amount of the metal catalyst supported. The Brunauer-Emmett-Teller Analysis (BET) specific surface area of carbon black itself without metal nanoparticles supported was 233.9 m2/g, and when metal nanoparticles were introduced, the specific surface area value was greatly reduced. This is because the metal nanocatalyst particles block the pore entrance of the carbon black, and thereby the catalytic activity of the metal catalysts generated inside the pores is reduced. From the I-V curves, as the content of the Pt nanocatalyst increased, the electrolytic properties of water increased, and the activity of the metal nanocatalyst was in the order of Pt > Ni > Fe.
자발적 환원반응에 의한 음이온 교환막 수전해용 Pt-Ni 나노 촉매 제조 및 특성
장붕비(PENGFEI ZHANG),이재영(JAEYOUNG LEE),이홍기(HONGKI LEE) 한국수소및신에너지학회 2022 한국수소 및 신에너지학회논문집 Vol.33 No.3
Pt-Ni nanocatalysts were loaded on carbon black by spontaneous reduction reaction of platinum (II) acetylacetonate and nickel (II) acetylacetonate, and they were characterized by transmission electron microscopy (TEM), thermogravimetric analyzer (TGA), energy dispersive x-ray analyzer (EDS), BET surface area and fuel cell test station. The distribution of the Pt and Ni nanoparticles was observed by TEM, and the loading weight of Pt-Ni nanocatalysts on the carbon black was measured by TGA. The elemental ratio of Pt and Ni was estimated by EDS. It was found that the loading weight of Pt-Ni nanoparticles was 5.54 wt%, and the elemental ratio of Pt and Ni was 0.48:0.35. Specific surface area was measured by BET analysis instrument and I–V characteristics were estimated.
친핵성 용매 중에서 자발적 환원반응에 의한 음이온 교환막 수전해용 Fe/Ni 나노 촉매의 제조 및 특성
대관하,노립신,이재영,이홍기 한국수소및신에너지학회 2021 한국수소 및 신에너지학회논문집 Vol.32 No.5
To synthesize Fe/Ni nanocatalysts loaded on carbon black, Iron(II) acetylacetonate and nickel (II) acetylacetonate and were reduced to Fe and Ni metallic nanoparticles by a spontaneous reduction reaction. The distribution of the Fe and Ni nanoparticles was observed by transmission electron microscopy, and the loading weight of Fe/Ni nanocatalysts on the carbon black was measured by thermogravimetric analyzer. The elemental ratio of Fe and Ni was estimated by energy dispersive x-ray analyzer. It was found that the loading weight of Fe/Ni nanoparticles was 6.23 wt%, and the elemental ratio of Fe and Ni was 0.53:0.40. Specific surface area was measured by BET analysis instrument and I–V characteristics were estimated.
건식 공정에서 자발적 환원 반응에 의한 AEM 수전해용 Fe-Ni 나노 촉매 제조 및 특성
이재영(JAEYOUNG LEE),이홍기(HONGKI LEE) 한국수소및신에너지학회 2024 한국수소 및 신에너지학회논문집 Vol.35 No.2
Fe-Ni nanocatalysts loaded on carbon black were prepared via spontaneous reduction reaction of iron (II) acetylacetonate and nickel (II) acetylacetonate in dry process. Their morphology and elemental analysis were characterized by scanning electron microscopy, transmission electron microscopy (TEM), and energy dispersive X-ray analyzer. The loading weight of the nanocatalysts was measured by thermogravimetric analyze and the surface area was measured by BET analysis. TEM observation showed that Fe and Ni nanoparticles was well dispersed on the carbon black and their average particle size was 4.82 nm. The loading weight of Fe-Ni nanocatalysts on the carbon black was 6.83-7.32 wt%, and the value increased with increasing iron (II) acetylacetonate content. As the Fe-Ni loading weight increased, the specific surface area decreased significantly by more than 50%, because Fe-Ni nanoparticles block the micropores of carbon black. I-V characteristics showed that water electrolysis performance increased with increasing Ni nanocatalyst content.
Boosted oxygen reduction reaction on PtNi alloy nanocrystals by N-functionalized carbon supports
유지문,안치영,성영은 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Electrocatalytic oxygen reduction reaction (ORR) on Pt surface has been dramatically boosted by recent breakthroughs in Pt-M (M=Transition metals) alloy nanocrystals. After the revelation of beneficial effect in transition metal alloying, various strategies have been suggested to increase Pt mass activity and stability. However, surface properties of carbon where Pt-M alloy nanocrystals are supported have long been regarded as a minor part of ORR electrocatalysis. Here, we report highly boosted ORR on PtNi nanocrystals by surface engineering of carbon supports. On N-functionalized surface, PtNi surface shows low affinity toward OH<sub>ad</sub>/O<sub>ad</sub> species, indicating low surface coverage and thereby much higher availability of Pt active sites during ORR electrocatalysis. This study sheds light on the importance of surface-engineering in carbon support as another important factor in nano-particulate electrocatalysts.