Volume 46, Issue 12 pp. 17262-17272
RESEARCH ARTICLE

Hydrogen evolution mechanism for Mg-H2O reaction in metal sulfate solutions and its application

Lei Wang

Lei Wang

College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang, China

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Tong Su

Tong Su

College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang, China

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Ning Wang

Ning Wang

Analysis and Testing Centre, Hebei Normal University, Shijiazhuang, China

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Yujun Chai

Corresponding Author

Yujun Chai

College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang, China

Hebei Key Laboratory of Inorganic Nano-materials, Hebei Normal University, Shijiazhuang, China

Correspondence

Yujun Chai, College of Chemistry and Materials Science, Hebei Normal University, Hebei, Shijiazhuang 050024, China.

Email: [email protected]

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First published: 12 July 2022
Citations: 3

Funding information: Science and Technology project of Hebei Education Department, Grant/Award Number: ZD 2020106

Summary

The reaction between Mg and H2O is slow at ambient temperature. Differently, hydrogen is rapidly evolved upon immersing Mg in MgSO4, CoSO4, and NiSO4 solutions at 303 K, and the hydrogen generation rates are ~40, 100, and 40 mL g−1 min−1, respectively. The H2 produced reacts with O2 in a fuel cell, generating a current of 200 to 500 mA. In CoSO4 solution, magnetic Co is separated, accompanied by heat release, inducing continued Mg-H2O reaction. However, little Ni is obtained during the entire process. In this case, the Mg(OH)2/Ni(OH)2 precipitate formed promotes water dissociation, and synergistic cooperation between the solution containing Mg2+ and SO42− and the freshly Mg(OH)2 accelerates H2 evolution. This study provides new insight for the reaction between metal and water in different salt solutions and for its application in fuel cell.

DATA AVAILABILITY STATEMENT

All data that support the findings of this study are available from the corresponding author upon reasonable request.

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