Thermodynamics, kinetics and reaction mechanism of hydrogen production from a novel Al alloy/NaCl/g-C3N4 composite by low temperature hydrolysis

Ming Su, Haiping Hu, Jianchang Gan, Wenhua Ye, Wenhua Zhang and Huihu Wang

Energy, 2021, vol. 218, issue C

Abstract: Real-time hydrogen production at low temperature can effectively solve the problem of hydrogen storage and transportation in cold area and plateau region. In this study, a novel Al alloy/NaCl/g-C3N4 composite with enhanced low temperature reactivity for hydrogen production has been synthesized by mechanical ball milling method. The feasibility of Al-water reaction at the temperature of 253.15–373.15 K was firstly proved by thermodynamic calculation. The hydrogen generation performance was studied in tap water at 298.15 K and 23 wt% NaCl aqueous solution at low temperature of 253.15–273.15 K. The results indicated that the addition of g-C3N4 can effectively promoted the hydrolysis of activated Al composites. Hydrogen yield of Al alloy/NaCl/g-C3N4 composite with 1 g of g-C3N4 addition reached 1006 mL·gAl−1 and the induction time of reaction was 90 s at 253.15 K, while that of Al alloy was only 230 mL·gAl−1 and 1120s respectively. It was supposed that the addition of g-C3N4 effectively reduced the size of NaCl particles and promoted their uniform distribution in Al matrix and more cracks were generated. The kinetics and reaction mechanism using Al alloy/NaCl/g-C3N4 composite were discussed. This study provides a new idea for the synthesis of Al composites with high reactivity at low temperature.

Keywords: Al; Hydrogen; g-C3N4; Mechanical ball milling; Mechanism (search for similar items in EconPapers)
Date: 2021
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:218:y:2021:i:c:s0360544220325962

DOI: 10.1016/j.energy.2020.119489

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