☆ 4.7 Article Proceedings Paper

A comparison study of Mg-Y2O3 and Mg-Y hydrogen storage composite powders prepared through arc plasma method

JOURNAL OF ALLOYS AND COMPOUNDS (2014)

期刊

JOURNAL OF ALLOYS AND COMPOUNDS

卷 615, 期 -, 页码 S684-S688

出版社

ELSEVIER SCIENCE SA

DOI: 10.1016/j.jallcom.2013.11.159

关键词

Hydrogen storage; Arc plasma method; Mg; Y; Y2O3

类别

Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering

资金

Science and Technology Committee of Shanghai [10JC1407700, 11ZR1417600]
Pujiang [11PJ1406000]
Research Fund for the Doctoral Program of Higher Education of China [20100073120007]
Shanghai education commission [12ZZ017]

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Protocol

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摘要

In this study, two Mg based hydrogen storage composite powders, Mg-Y2O3 and Mg-Y, were prepared through arc plasma method followed by in situ passivation. The composition, phase component, and hydrogen storage properties of the two powders were analyzed by using ICP, XRD, PCT and DTA techniques. ICP analyses revealed a reduction in Y content of both powders when compared to their initial composition, especially for the Mg-Y powder (from 25 wt% down to 0.58 wt%). XRD results showed the presence of Y2O3 both in the Mg-Y2O3 and the Mg-Y powders. PCT analyses showed that the hydrogen storage capacity of the Mg-Y2O3 powder is higher than that of the Mg-Y powder. Based on van't Hoff equation, the hydrogenation enthalpies of the Mg-Y2O3 and Mg-Y powders are determined to be -75.4 and -71.8 kf/mol H-2, respectively. DTA measurements showed that the onset dehydriding temperature of the hydrogenated Mg-Y2O3 powder is lower than that of the hydrogenated Mg-Y powder. The above results indicated that Y2O3 has a good catalytic effect on the hydrogen sorption in Mg and the effect can be better achieved in the arc evaporated Mg-Y2O3 composite powder. (C) 2013 Elsevier B.V. All rights reserved.

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Article Chemistry, Physical

High-performance low-temperature solid oxide fuel cell with nanostructured lanthanum strontium cobaltite/yttria-stabilized zirconia cathode via advanced co-sputtering

Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee

Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.

JOURNAL OF ALLOYS AND COMPOUNDS (2024)

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Article Chemistry, Physical

Amorphous quaternary alloy nanoplates for efficient catalysis of hydrogen evolution reaction

Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu

Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.

JOURNAL OF ALLOYS AND COMPOUNDS (2024)

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