Enhanced hydrogen generation behaviors and hydrolysis thermodynamics of as-cast Mg-Ni-Ce magnesium-rich alloys in simulate seawater
Article
Article Title | Enhanced hydrogen generation behaviors and hydrolysis thermodynamics of as-cast Mg-Ni-Ce magnesium-rich alloys in simulate seawater |
---|---|
ERA Journal ID | 1184 |
Article Category | Article |
Authors | Hou, Xiaojiang (Author), Wang, Yi (Author), Yang, Yanling (Author), Hu, Rui (Author), Yang, Guang (Author), Feng, Lei (Author), Suo, Guoquan (Author), Ye, Xiaohui (Author), Zhang, Li (Author), Shi, Hongchang (Author), Yang, Lu (Author) and Chen, Zhi-Gang (Author) |
Journal Title | International Journal of Hydrogen Energy |
Journal Citation | 44 (44), pp. 24086-24097 |
Number of Pages | 12 |
Year | 2019 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 0360-3199 |
1879-3487 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.ijhydene.2019.07.148 |
Web Address (URL) | https://www.sciencedirect.com/science/article/abs/pii/S0360319919327247 |
Abstract | In this study, we developed as-cast (Mg10Ni)1-xCex (x = 0, 5, 10, 15 wt%) ternary alloys by using a flux protection melting method and investigated their hydrolysis hydrogen generation behaviour in simulate seawater. The phase compositions and microstructures of as-cast (Mg10Ni)1-xCex ternary alloys are characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) equipped with electron energy dispersion spectrum (EDS) and transition electron microscope (TEM). Their kinetics, thermodynamics, rate-limiting steps and apparent activation energies are investigated by fitting the hydrogen generation curves at different temperatures. With increasing Ce content, the (Mg10Ni)1-xCex ternary alloys show increased electrochemical activities and decreased eutectic. When 10 wt% and 15 wt% Ce added, the active intermediate phase of Mg12Ce has been observed. The hydrogen generation capacity of (Mg10Ni)95Ce5 is as high as 887 mLg−1 with a hydrolysis conversion yield of 92%, which is higher than that of Mg10Ni alloys (678 mLg−1) with a yield only 75% at 291 K. The initial hydrolysis reaction kinetics of Mg–Ni–Ce alloys is mainly controlled by the electrochemical activity and the mass transfer channels formed in the alloys. Such a structure-property relationship will provide a possible strategy to prepare Mg-based alloys with high hydrogen conversion yield and controlled hydrolysis kinetics/thermodynamics. |
Keywords | hydrogen generation; Mg alloys; microstructure; kinetics; thermodynamics; hydrolysis mechanism |
ANZSRC Field of Research 2020 | 401603. Compound semiconductors |
401605. Functional materials | |
340301. Inorganic materials (incl. nanomaterials) | |
401807. Nanomaterials | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Shaanxi University of Science and Technology, China |
Northwestern Polytechnical University, China | |
Centre for Future Materials | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q755x/enhanced-hydrogen-generation-behaviors-and-hydrolysis-thermodynamics-of-as-cast-mg-ni-ce-magnesium-rich-alloys-in-simulate-seawater
85
total views4
total downloads0
views this month0
downloads this month