Article
Chemistry, Physical
Olesya A. Buryakovskaya, Grayr N. Ambaryan, Musi Zh. Suleimanov, Alexey B. Tarasenko, Mikhail S. Vlaskin
Summary: Composite materials were prepared by high energy ball milling of mixed scrap of Mg-based alloys and low melting point Sn-Pb eutectic, and their hydrogen generation performance was tested in NaCl solution. The effects of ball milling duration and additive content on microstructure and reactivity were investigated. SEM analysis showed significant structural transformations during ball milling, and XRD analysis confirmed the formation of new intermetallic phases Mg2Sn and Mg2Pb to enhance galvanic corrosion of the base metal. The reactivity of the material exhibited a non-monotonic dependency on activation time and additive content. Among all tested samples, milling for 1 hour and a composition with 5 wt.% Sn-Pb alloy showed the highest hydrogen generation rates and yields compared to other conditions.
Article
Chemistry, Physical
Acong Meng, Yaoning Sun, Wangjun Cheng, Zhenguo Zhai, Liheng Jiang, Zhenzeng Chong, Yufeng Chen, Anqi Wu
Summary: This paper investigates the effect of different Ga content and In-Sn ratio on the hydrogen production performance of aluminum alloy. The study successfully prepares an aluminum alloy with a high hydrogen conversion rate and low activation energy by adding Ga, In, and Sn to aluminum, which promotes the development and utilization of hydrogen energy.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
Zeng Gao, Fei Ji, Dongfeng Cheng, Congxin Yin, Jitai Niu, Josip Brnic
Summary: This paper focuses on the research of hydrogen energy as an energy selection direction, analyzing the hydrogen production performance of multi-element aluminum alloy ingots with different compositions through experiments. The experimental results show that the composition ratio of aluminum alloy is related to hydrogen production performance, and the content of the second phase also affects hydrogen production performance.
Article
Thermodynamics
Chengzong Zeng, Jun Shen, Chaofan Ma
Summary: Low melting point metal (LMPM) based composites containing particles with high thermal conductivity have potential applications in thermal management. In this study, lead free eutectic field's metal Bi32.5In51Sn16.5 was used as the LMPM, and diamond microparticles were added as thermal conductive reinforcement. The addition of diamond particles increased the thermal conductivity of the LMPM by 85%. The thermal performance of LMPM-based heat sink filled with LMPM/diamond composites showed improved temperature control during long-time heating and faster cooling after power-off. The addition of diamond particles also affected the melting/solidification process of LMPM, prolonging the melting duration, reducing the subcooling effect, and shortening the initial solidification time.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Chemistry, Physical
F. J. Antiqueira, D. R. Leiva, G. Zepon, W. J. Botta
Summary: In recent studies, it was found that high energy ball milling of Mg/MgH2 mixed with additives can reduce the temperature for H-2 absorption/desorption without altering thermodynamic properties. This research aimed to identify efficient hydrogen absorption/desorption catalysts at low temperatures, particularly at room temperature (RT). Among the additives tested in this study, MgH2-TiFe mixture showed the best performance, attributed to the strong catalytic action of TiFe and the high energy interfaces attracting hydrogen gas.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Lixiang Zhu, Meishuai Zou, Xiaodong Zhang, Lichen Zhang, Xiaoxuan Wang, Tinglu Song, Shuo Wang, Xiaodong Li
Summary: The paper introduces a new method to enhance the hydrogen generation rate of Al alloys through a multi-step process. The addition of low-melting-point Ga-In-Sn phases acts as a transmission medium to improve the diffusion of Al, leading to higher hydrogen generation performance. Results show significantly improved H-2 generation rate and efficiency compared to previous studies.
Article
Chemistry, Physical
Olesya A. Buryakovskaya, Mikhail S. Vlaskin
Summary: A method has been developed to transform magnesium scrap into highly efficient hydroreactive material. The addition of Devarda's alloy during ball milling can accelerate the reaction and improve the production of hydrogen gas and reaction rates.
Article
Energy & Fuels
Peng Sheng, Songli Zhang, Jian Yang, Chuang Guan, Jianpeng Li, Mingjie Liu, Weiwu Pan, Yanqi Wang
Summary: The presence of NaCl affects the hydrogen generation capability of Al-Ga-In-Sn-NaCl composites, with excess NaCl leading to a decrease in hydrogen generation. Optimizing the milling time can increase the hydrogen yield of the composites. Additionally, the composites can maintain 100% and 94% of the original hydrogen yield after being exposed to air for 5 and 10 days, respectively.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Physical
Maria Rodriguez, Guillermina Urretavizcaya, Jean-Louis Bobet, Facundo J. Castro
Summary: This paper discusses the reprocessing of Mg scraps from sacrificial anodes manufacturing by mechanical milling for the production of H2 by hydrolysis. The effects of iron and graphite as additives to improve the hydrolysis reaction are presented. It has been found that pre-milling the scraps with 1.5 wt% of Fe for 10 hours followed by an extra milling with 5 wt% of graphite for 1 hour produces the best results. The addition of Fe accelerates the reaction rate by inducing microgalvanic coupling with Mg, while graphite acts as a process control agent during milling and contributes to size reduction of the material, resulting in faster H2 production.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Mengru Hu, Xin Sun, Bo Li, Peng Li, Meichai Xiong, Jun Tan, Zhangze Ye, Juergen Eckert, Chu Liang, Hongge Pan
Summary: This study presents a low-cost, time-saving, and low-carbon method for synthesizing Mg(NH2)(2) through mechanochemical reaction of metallic Mg with ammonia. The synthesized Mg(NH2)(2) shows comparable hydrogen storage performance as the conventional method, providing a potential large-scale synthesis route for hydrogen storage.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Maria Rodriguez, Franco Niro, Guillermina Urretavizcaya, Jean-Louis Bobet, Facundo J. Castro
Summary: Magnesium-based wastes were reprocessed by mechanical milling and used to produce hydrogen through hydrolysis. The material evolved during reprocessing and hydrogen was generated in a MgCl2 solution at 24 degrees C. The particle size, crystallite size, microstrain, and phase abundance changed during mechanical processing. Hydrogen yields of 70-90% were obtained after 30 min of reaction, depending on milling time. The reaction kinetics improved with milling time, and the hydrolysis curves could be fitted with a model limited by a three-dimensional geometric contraction process. Mg17Al12 and Fe played a role in promoting hydrogen production during the reaction.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Hongwei Qiu, Guo Yang, Lijun Lv, Xingbo Han, Shuyan Zang, Wei Liu, Xiaofeng Wang
Summary: The LaMg12H27 (LMH) and LMH-5 wt% LiH samples were prepared by different ball milling times, and their hydrogen generation performances were investigated and compared. X-ray diffraction and scanning electron microscopy techniques were used to explain the performance improvement mechanisms. The hydrogen generation yield and kinetics of LMH can be significantly improved with increasing ball milling time, possibly due to changes in the particle size and crystallite size of LMH. However, for the LMH-5 wt% LiH sample, the initial kinetics increases first and then decreases with increasing ball milling time, possibly due to the gradual movement of LiH from the surface to the interior of LMH and the covering of LMH after ball milling.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Thermodynamics
Wenhua Guo, Rijing Zhao, Yi Liu, Dong Huang
Summary: This paper investigates the melting process of low melting point metal (LMPM) under Rayleigh-Benard convection through scale analysis and numerical investigation. It reveals that the melting rate of low-Pr LMPM is faster, melting time is shorter, and average heat flux is higher compared to high-Pr PCM. The study also shows that Rayleigh-Benard convection causes significant changes in flow cell morphology for low-Pr LMPM and oscillations in Nu.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Nikolaus Gorgas, Andrew J. P. White, Mark R. Crimmin
Summary: The reactions of transition metal complexes involve the participation of molecular orbitals centered on the transition metal. However, this study found that including an aluminum-based ligand in a low-spin iron complex can lead to unexpected reactivity, specifically the intermolecular C-H bond activation of pyridines. Mechanistic analysis suggests that C-H activation proceeds through a reductive deprotonation, with the Fe and Al acting as a frustrated Lewis pair. These findings have important implications for the design of reagents and catalysts based on first-row transition metals.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Energy & Fuels
Yu Xu, Jiale Wang, Tong Li
Summary: This study investigates the performance of low melting point metals and phase change materials in heat sinks by adopting a bismuth-based alloy. The experimental results show that heat sinks filled with LMPMs have significant advantages in reducing heating wall temperature and prolonging holding time.
