Article
Chemistry, Physical
Sanghun Lee, Jaemyung Lee, Taehong Kim, Gwangwoo Han, Jaeseok Lee, Kangyong Lee, Joongmyeon Bae
Summary: In this study, Pt/CeO2 catalyst exhibited a much faster dehydrogenation rate of H18-DBT compared to Pt/Al2O3. The slower dehydrogenation rate of Pt/Al2O3 was attributed to the slow mass transport of liquid H18-DBT into the catalyst pores due to the small pores present in Pt/Al2O3.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Ahsan Ali, Ajith Krishnan Rohini, Young Su Noh, Dong Ju Moon, Hee Joon Lee
Summary: The study explores the hydrogenation of dibenzyltoluene and the dehydrogenation of perhydro-dibenzyltoluene (H18-DBT), finding optimal conditions for both reactions. Different loadings of Pt on Al2O3 catalysts are tested for dehydrogenation, with 5% Pt/Al2O3 proving to be the most effective in storing and releasing hydrogen. Cyclic experiments show the stability of DBT over multiple cycles.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Engineering, Chemical
Alexander Wunsch, Ellen Gapp, Thijs Peters, Peter Pfeifer
Summary: The use of PdAg membranes for purifying product gas from LOHC dehydrogenation shows promising results, with low impurities allowing for low pressure operation and facilitating coupling with the dehydrogenation step. However, exposure to impurities in the product gas can lead to a significant decrease in membrane performance, which can be restored by using pure hydrogen. The activation energy of permeation and desorption of impurities play a crucial role in the performance of the membrane.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Ximeng Chen, Christian H. Gierlich, Simon Schoetz, Dominik Blaumeiser, Tanja Bauer, Joerg Libuda, Regina Palkovits
Summary: The study reveals that sulfur-doped Pt/TiO2 catalyst shows efficient dehydrogenation performance in LOHC systems, benefiting from its high selectivity towards dibenzyltoluene, and is more competitive than current benchmark catalysts.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Engineering, Environmental
Hanh My Bui, Paula F. Grossmann, Anne Berger, Alexander Seidel, Markus Tonigold, Normen Szesni, Richard Fischer, Bernhard Rieger, Olaf Hinrichsen
Summary: Two additive manufacturing techniques, Direct Ink Writing (DIW) and Binder Jetting (BJ), were compared for catalyst shaping. The supports made from 3D printed Al2O3 were impregnated with H3Pt(SO3)2(OH) and tested for dehydrogenation reactions. The results showed that BJ had higher meso- and macroporosity and could load more Pt.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Ahsan Ali, Ajith Krishnan Rohini, Hee Joon Lee
Summary: A preliminary study on the dehydrogenation of perhydro-dibenzyltoluene as a liquid organic hydrogen carrier was conducted, with a focus on switching from a stirred tank reactor to a continuous flow microchannel reactor. The results showed that the continuous flow microchannel reactor achieved a higher hydrogen production percentage compared to the stirred tank reactor. Moreover, increasing the bottom plate temperature had a positive effect on hydrogen production. The study also proposed a kinetic model for the dehydrogenation process in the microchannel reactor.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Jingwen Zhou, Jin Suk Chung, Sung Gu Kang
Summary: This study systematically investigated the influence of doping M atoms onto Pt-based subsurface alloys and the application of biaxial strain on the electronic properties of Pt atoms, affecting hydrogen adsorption strength and the rate-determining step of dehydrogenation process. The results showed that doping and strain promotion could enhance dehydrogenation, and the correlation between d-band centers, reaction energies, and hydrogen adsorption energy suggested the practical descriptor of dehydrogenation activity.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Yun Liu, Zhefei Pan, Oladapo Christopher Esan, Xiaoyu Huo, Xingyi Shi, Liang An
Summary: In this work, a new passive ammonia fuel cell prototype is designed and tested. The developed ammonia fuel cell features a passive supply of ammonia to the anode and an open cathode design. The performance and behavior of the fuel cell are investigated under different operating conditions, as well as the influence of structural parameters on mass transport and performance.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Physical
Phillimon Modisha, Rudaviro Garidzirai, Hande Gunes, Selmi Erim Bozbag, Sarshad Rommel, Erdal Uzunlar, Mark Aindow, Can Erkey, Dmitri Bessarabov
Summary: Pt/Al2O3 catalysts prepared using the SCD method showed the best catalytic performance for the dehydrogenation of H18-DBT, attributed to the higher dispersion of Pt particles and smaller particle size. The deactivation was mainly caused by adsorbed H0-DBT blocking the active sites. The study revealed that improved catalyst performance led to increased production of liquid by-products and carbon materials.
Article
Nanoscience & Nanotechnology
Abu Zafar Al Munsur, Bon-Hyuk Goo, Youngkwang Kim, Oh Joong Kwon, Sae Yane Paek, So Young Lee, Hyoung-Juhn Kim, Tae-Hyun Kim
Summary: The semi-IPN membrane NPP-95, composed of Nafion, PAA, and PVA, exhibited excellent thermal, mechanical, and dimensional stability, as well as lower permeability and higher conductivity compared to re-Nafion. The membrane showed significantly improved water management and lower hydrogen crossover under actual fuel cell operating conditions. In both PEMFC and PEMWE applications, NPP-95 demonstrated higher current density and better performance than re-Nafion.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Stefania Siracusano, Fabiola Panto, Stefano Tonella, Claudio Oldani, Antonino S. Arico
Summary: In this study, a reinforced Aquivion (R) membrane-based membrane-electrode assembly demonstrated superior performance and durability in polymer electrolyte membrane water electrolysis compared to a conventional extruded membrane-based assembly.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Review
Chemistry, Physical
Qianwen Tang, Bing Li, Daijun Yang, Pingwen Ming, Cunman Zhang, Yanbo Wang
Summary: The article reviews the literature on hydrogen crossover in PEMFC, covering consequences, causes, mitigation measures, and detection methods. It discusses the influences of hydrogen crossover on the components and performance, analyzes the causes, and summarizes methods to alleviate membrane degradation. Various monitoring methods are described, providing a foundation for further research and improvement in fuel cell durability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Inorganic & Nuclear
Li Liu, Ting Zhu, Mengwei Xia, Yuanzheng Zhu, Hanzhong Ke, Ming Yang, Hansong Cheng, Yuan Dong
Summary: A comprehensive study was conducted to investigate the hydrogenation and dehydrogenation of dibenzyltoluene using different metal catalysts. The results showed significant variations in catalytic activity, with Rh/Al2O3 and Pt/Al2O3 demonstrating the highest activity for hydrogenation and dehydrogenation, respectively. The activation energies and purity of the produced hydrogen gas were also evaluated, providing valuable insights for developing efficient catalysts for liquid organic hydrogen carriers.
INORGANIC CHEMISTRY
(2023)
Article
Environmental Sciences
Kuan Shiong Khoo, Wen Yi Chia, Kexin Wang, Chih-Kai Chang, Hui Yi Leong, Muhammad Nasrulhazim Bin Maaris, Pau Loke Show
Summary: This review summarizes the application of ionic liquids in high-temperature proton exchange membrane fuel cells, discusses their advantages when combined with polybenzimidazole, and evaluates and discusses the research development and issues of ILs.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Physical
Johannes Geiling, Michael Steinberger, Florian Ortner, Roman Seyfried, Andreas Nuss, Felix Uhrig, Christopher Lange, Richard Oschsner, Peter Wasserscheid, Martin Maerz, Patrick Preuster
Summary: The study shows that liquid organic hydrogen carriers can be a promising alternative for hydrogen storage, and demonstrates successful dynamic combined operation of LOHC reactor and PEM fuel cell. The fuel cell operated stably for 4.5 hours, with carbon hydrocarbon contaminants removed through activated carbon filtering without any detectable impairment or degradation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Gwangwoo Han, YongKeun Kwon, Joong Bae Kim, Sanghun Lee, Joongmyeon Bae, Eunae Cho, Bong Jae Lee, Sungbaek Cho, Jinwoo Park
Article
Chemistry, Physical
Gwangwoo Han, Minseok Bae, Sungbaek Cho, Joongmyeon Bae
JOURNAL OF POWER SOURCES
(2020)
Article
Chemistry, Physical
Joong Bae Kim, Gwangwoo Han, YongKeun Kwon, Joongmyeon Bae, EunAe Cho, SungBaek Cho, Bong Jae Lee
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Chemistry, Physical
Sanghun Lee, Jaemyung Lee, Taehong Kim, Gwangwoo Han, Jaeseok Lee, Kangyong Lee, Joongmyeon Bae
Summary: In this study, Pt/CeO2 catalyst exhibited a much faster dehydrogenation rate of H18-DBT compared to Pt/Al2O3. The slower dehydrogenation rate of Pt/Al2O3 was attributed to the slow mass transport of liquid H18-DBT into the catalyst pores due to the small pores present in Pt/Al2O3.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Min-Hwi Kim, Deuk-Won Kim, Gwangwoo Han, Jaehyeok Heo, Dong-Won Lee
Summary: This study experimentally investigated the use of ground source heat pump (GSHP) and sewage water source heat pump (SWSHP) facilities in district cooling and heating networks, and derived a heat pump performance prediction model. It was found that fouling affects the cooling performance of SWSHP, and preventing fouling can lead to similar COP as GSHP.
Article
Energy & Fuels
Gwangwoo Han, Sanghun Lee, Jaemyung Lee, Kangyong Lee, Joongmyeon Bae
Summary: This study proposes an AI-based arbitrage strategy to maximize operating profit in the electricity market, benefiting both the operator of an energy storage system and the grid operator. By introducing a stimulus-integrated arbitrage algorithm combining deep learning and reinforcement learning, significant increases in operating profit and reductions in on-peak power for the grid operator were achieved.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Chemistry, Physical
Jae Young Yoo, Jaemyung Lee, Gwangwoo Han, Aadesh Harale, Sai Katikaneni, Stephen N. Paglieri, Joongmyeon Bae
Summary: This study proposes an on-site hydrogen production system that converts heavy naphtha to high-purity hydrogen for remote areas without convenient access to hydrogen. By utilizing a pressurized steam reformer and a catalytic membrane reactor, the system can effectively produce hydrogen and enhance accessibility.
JOURNAL OF POWER SOURCES
(2021)
Article
Green & Sustainable Science & Technology
Sanghun Lee, Taehong Kim, Gwangwoo Han, Sungmin Kang, Young-Sung Yoo, Sang-Yun Jeon, Joongmyeon Bae
Summary: A comparative energetic study on LOHC and other hydrogen storage technologies was conducted, showing that the RHFC system with LOHC has higher ESOIe for weekly (<100 h) and monthly (<1000 h) energy storage due to the low embodied energy cost of LOHC materials. This suggests that the RHFC system with LOHC is an attractive option for weekly and monthly energy storage of wind and solar power.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Chemistry, Physical
Jaemyung Lee, Changho Yeon, Jiwoo Oh, Gwangwoo Han, Jeong Do Yoo, Hyung Joong Yun, Chan-Woo Lee, Kang Taek Lee, Joongmyeon Bae
Summary: Liquid fuel reforming is an efficient method for hydrogen production in mobile fuel cell systems. However, the catalyst used in this process is susceptible to damage from coke formation and thermal sintering. In this study, an exsolved PtRu alloy catalyst was investigated for diesel reforming. The properties of the catalyst, including its crystal structure, electronic state, and surface morphology, were analyzed using XRD, XPS, and TEM. DFT calculations were also used to predict the energetics of metal exsolution and alloy formation on the catalyst's surface. The PtRu alloy catalyst demonstrated improved activity and stability, with a high resistance to coke formation and thermal sintering, compared to monometallic Pt and Ru catalysts.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Energy & Fuels
Heeyeon Lee, Sanghun Lee
Summary: This study develops a cost estimation model applicable to hydrogen pipeline construction and compares various scenarios. The study finds that modifying existing natural gas pipelines to hydrogen pipelines has the lowest cost, but safety issues arise. A short-distance hydrogen pipeline serves as a transitional solution, while a long-distance main hydrogen pipeline brings the ultimate network advantage.
Article
Thermodynamics
Gwangwoo Han, Hong-Jin Joo, Hee-Won Lim, Young-Sub An, Wang-Je Lee, Kyoung-Ho Lee
Summary: The need for reducing carbon emissions and achieving Net Zero energy has made improving heat pumps' operational efficiency a crucial goal. This study proposes a model-free deep reinforcement learning-based HP operation strategy, which minimizes electricity costs by considering thermal load demand, renewable generation, COP of HPs, and SOC of thermal storage. The results show that this method can reduce the year-round demand charge by 23.1%, energy charge by 21.7%, and electricity cost by 22.2%.
Article
Energy & Fuels
Young -Sub An, Jongkyu Kim, Hong-Jin Joo, Gwang-woo Han, Haneul Kim, Wangje Lee, Min-Hwi Kim
Summary: South Korea has set a target of achieving net-zero-energy buildings by 2030, and this study investigates the improvement and maximization of energy from renewable energy systems by retrofitting an existing community. Through retrofit planning, the total capacity of renewable energy applied in the community could reach 75.4 kW. Simulation analysis shows that using building integrated photovoltaic (BIPV) and photovoltaic and thermal (PVT) systems can significantly increase the renewable energy generation rates. The annual energy balance analysis indicates that 46.2% surplus energy can be generated through renewable energy systems in the retrofitted community.
