Article
Thermodynamics
Liang Tong, Chengqing Yuan, Tianqi Yang, Yupeng Yuan, Richard Chahine, Jinsheng Xiao
Summary: The thermal management between the metal hydride (MH) tank and the proton exchange membrane fuel cell (PEMFC) has been investigated. A lumped parameter model for the PEMFC-MH system has been developed and validated to predict the system performance. The results indicate the feasibility of using waste heat from the PEMFC to heat the MH bed. The effect of valve's opening degree on system performance has been studied and shown to be an effective control measure in thermal management to improve energy efficiency of the PEMFC-MH system.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Sunku Prasad, P. Muthukumar
Summary: This study conducted experiments on an annular porous metal hydride reactor equipped with radial fins. The absorption and desorption characteristics were studied under different pressure and temperature conditions. The energy efficiency of the developed hydrogen storage device was evaluated, and the effect of pre-sensible heating on desorption performance was analyzed. The results showed that the developed system had an energy efficiency of 76.76% and La0.7Ce0.1Ca0.3Ni5 exhibited higher storage capacity.
APPLIED THERMAL ENGINEERING
(2022)
Article
Chemistry, Physical
Terry D. Humphries, Mark Paskevicius, Ali Alamri, Craig E. Buckley
Summary: Thermal batteries are efficient for storing renewable energies, utilizing reversible thermochemical reactions to drive a heat engine. Studies on the SrH2-2Al system have shown promising properties for high efficiency operation, which could enhance technological applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Green & Sustainable Science & Technology
Sumeet Kumar Dubey, K. Ravi Kumar
Summary: This study provides a detailed analysis of the energy absorption and desorption of a metal hydride suitable for high temperature in a dual bed metal hydride-based thermal energy storage system. The effects of the number of heat transfer fluid tubes and different aspect ratio geometry on the energy absorption characteristics and heat transfer phenomenon are studied. The outcomes of this study are crucial for the design of metal hydride-based thermochemical energy storage systems for process heating and power generation.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Chemistry, Physical
Gamze Atalmis, Mehmet Demiralp, Nebi Yelegen, Yuksel Kaplan
Summary: This study investigates the process parameters that affect the improvement of hydrogen storage material properties. The thermal conductivity of the storage materials has been improved to accelerate the hydrogen charge/discharge processes and obtain the required hydrogen at desired flow rates in a short time. The experimental results show that coating the storage material with copper increases heat transfer, reduces the hydrogen charging time, and improves stable discharge time in the metal hydride reactor.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Review
Engineering, Chemical
Zhen Chen, Zhongliang Ma, Jie Zheng, Xingguo Li, Etsuo Akiba, Hai-Wen Li
Summary: Hydrogen is considered a clean energy carrier that can be stored in gas, liquid, and solid states, with solid-state hydrides providing a more compact and safer storage option. This review provides an overview of material groups capable of reversible hydrogen absorption and desorption, summarizing their storage properties and discussing key issues and materials design guidance for new material development and industrial applications.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Rashmi Kesarwani, Vivek Shukla, M. Sterlin Leo Hudson, Mohammad Abu Shaz
Summary: The study demonstrates that dual auto-catalysts MgF2 and CsH can significantly improve the hydrogen sorption properties and thermodynamic tuning of MgH2, aiding in hydrogen storage and release processes. This is crucial for enhancing the de/rehydrogenation kinetics of MgH2.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
Sayantan Jana, P. Muthukumar
Summary: This study presents experimental studies on a tube bundle reactor (TBR) designed for metal hydride (MH) based hydrogen storage system. The TBR consists of 19 MH tubes and operates at low temperature and moderate pressure, with a projected storage capacity of approximately 385 g hydrogen. The results show that the optimal absorption temperature and pressure range is 10-20 bar and 283-293 K, respectively. The reactor is able to store 369.09 g (1.39 wt.%) hydrogen within 1372 s at 20 bar and 293 K, and the estimated energy efficiency of hydrogen storage is between 58-64%.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Physical
Charlie Wilson, Simon De Stercke, Caroline Zimm
Summary: Granular energy technologies, with smaller unit sizes and costs, have advantages in faster deployment, job creation, and wider distribution of benefits compared to large-scale alternatives. A study analyzed 93 green recovery funding programs in France, Germany, South Korea, and the UK, and found that South Korea's program had the highest technological granularity, focusing on distributed renewables, smart technologies, and low-cost technologies that are quick to implement. The UK, on the other hand, concentrated public funds on a few mega-scale energy projects with high implementation risks, resulting in the least granular portfolio. The study demonstrates the importance of technological granularity in achieving green recovery goals.
Article
Energy & Fuels
Djafar Chabane, Mehroze Iqbal, Fabien Hare, Abdesslem Djerdir, Denis Candusso, Omar Elkedim, Nour-eddin Fenineche
Summary: This paper presents a thermal coupling topology of a PEMFC with a metal hydride tank for vehicular applications. The heat generated by the PEMFC is reused to extract usable hydrogen for PEMFC, and two heat exchangers are integrated into the system to regulate temperature and pressure effectively. The proposed controller in the simulations achieves the objectives of maintaining temperature and pressure for reliable operation.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Physical
Lucas Poupin, Terry D. Humphries, Mark Paskevicius, Craig E. Buckley
Summary: Metal hydrides are effective energy storage materials for thermal battery applications, with Magnesium iron hydride (Mg2FeH6) showing promising reversible hydrogenation reactions for thermal energy storage. The automated thermal battery prototype demonstrated excellent cyclic energy storage reversibility and achieved a maximum energy capacity of 1650 kJ, which is 87% of the theoretical value. Operating conditions such as ideal temperature, flow rate of heat transfer fluid, and hydrogen pressures were optimized to enhance the performance of the system.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Sruthy Balakrishnan, Terry D. Humphries, Mark Paskevicius, Craig E. Buckley
Summary: Calcium hydride has shown potential as a hydrogen storage and thermochemical energy storage material, but its high operating temperature has limited its application and research on its hydrogen sorption thermodynamics. This study provides experimental data on the thermodynamic properties and activation energy of CaH2 in both solid and molten states, filling the gap in the thermodynamics of the Ca-H system for the first time in over 60 years.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Arnaud C. M. Griffond, M. Veronica Sofianos, Drew A. Sheppard, Terry D. Humphries, Anna-Lisa Sargent, Martin Dornheim, Kondo-Francois Aguey-Zinsou, Craig E. Buckley
Summary: The thermal energy storage properties of calcium hydride (CaH2) destabilized with silicon (Si) or CaxSiy compounds at various molar ratios were studied, revealing multi-step thermal decomposition reactions and identifying the most suitable compounds for concentrated solar power plants. The practical enthalpy of decomposition for Ca5Si3 was determined through pressure composition isothermal measurements, showing a discrepancy with the calculated value due to the formation of unwanted phases.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Jiaze Ma, Michael Rebarchik, Saurabh Bhandari, Manos Mavrikakis, George W. Huber, Victor M. Zavala
Summary: In this study, the economic viability of integrating flexible electrolysis units to produce hydrogen in methanol synthesis processes is investigated. It is found that exploiting the dynamics of electricity markets can make hydrogen production cost-competitive, with the electricity cost nearly collapsing to zero when the electrolysis system is operated in flexible mode.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Physical
Manoj S. Choudhari, Vinod Kumar Sharma
Summary: The increasing energy demand highlights the importance of energy conservation and utilization of renewable sources. Thermochemical energy storage system is a useful technology for energy storage during the availability of renewable energy sources. The MH-TES shows higher energy storage density and COP, with potential for optimization through operating temperature adjustment.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Naruki Endo, Yoshitomo Furukawa, Kiyotaka Goshome, Satoshi Yaegashi, Kin-ichi Mashiko, Maeda Tetsuhiko
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2019)
Article
Chemistry, Physical
Naruki Endo, Eisuke Shimoda, Kiyotaka Goshome, Toshihiro Yamane, Tsuyoshi Nozu, Tetsuhiko Maeda
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2019)
Article
Chemistry, Physical
Naruki Endo, Eisuke Shimoda, Kiyotaka Goshome, Toshihiro Yamane, Tsuyoshi Nozu, Tetsuhiko Maeda
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Chemistry, Physical
Naruki Endo, Yuta Segawa, Kiyotaka Goshome, Eisuke Shimoda, Tsuyoshi Nozu, Tetsuhiko Maeda
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Chemistry, Physical
Kiyotaka Goshome, Naruki Endo, Tetsuhiko Maeda
Summary: This study examined the cycle durability and thermodynamic characteristics of V40TiCr and V70TiCr to evaluate their performance as metal hydride compressors. It was found that incomplete hydrogen absorption cycles under low pressure increased hysteresis in the higher hydrogen concentration region, but the equilibrium absorption pressure recovered after several full cycles at higher pressure. V70TiCr with a low Ti/Cr ratio demonstrated good cycle durability and is expected to compress 1.7 wt% of hydrogen ten times from 5.4 to 54.8 MPa between 35 and 155 degrees C.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Kiyotaka Goshome, Naruki Endo, Tetsuhiko Maeda
Summary: This study demonstrated a one-stage metal hydride hydrogen compressor using a BCC alloy, showing its potential for compressing hydrogen gas effectively.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Naruki Endo, Norikazu Dezawa, Yasuhiro Komo, Tetsuhiko Maeda
Summary: A one-step electroplating method was used to prepare palladium-copper (PdCu) alloy layers with high surface coverage and sufficient adhesion, close to the target composition. The hydrogen permeability of the electroplated PdCu/V/PdCu alloy was significantly higher than that of the electroplated BCC PdCu.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Yuta Segawa, Naruki Endo, Eisuke Shimoda, Tetsuhiko Maeda
Summary: This article discusses a pilot-scale green hydrogen energy utilization system, including photovoltaic panels, a water electrolyzer, metal hydride hydrogen storage, fuel cells, and lithium-ion batteries. The system's CO2 reduction capability is shown to be better than that of a PV-only system under various weather conditions. However, the use of grid power for hydrogen production raises concerns in the event of drastic weather changes.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)