Fabrication of Al-Ni Alloys for Fast Hydrogen Production from Hydrolysis in Alkaline Water

Kwon, JaeYoung; Eom, KwangSup; Kim, MinJoong; Toor, Ihsan; Oh, SeKwon; Kwon, HyukSang

doi:10.3390/ma16237425

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Fabrication of Al-Ni Alloys for Fast Hydrogen Production from Hydrolysis in Alkaline Water

by

JaeYoung Kwon

¹,

KwangSup Eom

²,

MinJoong Kim

³,

Ihsan Toor

¹,

SeKwon Oh

^4,* and

HyukSang Kwon

^1,*

¹

Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34051, Republic of Korea

²

Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea

³

Hydrogen Research Department, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea

⁴

Research Institute of Advanced Manufacturing Technology, Surface R&D Group, Korea Institute of Industrial Technology, Incheon 21999, Republic of Korea

^*

Authors to whom correspondence should be addressed.

Materials 2023, 16(23), 7425; https://doi.org/10.3390/ma16237425

Submission received: 20 October 2023 / Revised: 27 November 2023 / Accepted: 28 November 2023 / Published: 29 November 2023

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Abstract

Hydrogen generation through the hydrolysis of aluminum alloys has attracted significant attention because it generates hydrogen directly from alkaline water without the need for hydrogen storage technology. The hydrogen generation rate from the hydrolysis of aluminum in alkaline water is linearly proportional to its corrosion rate. To accelerate the corrosion rate of the aluminum alloy, we designed Al-Ni alloys by continuously precipitating an electrochemically noble Al₃Ni phase along the grain boundaries. The Al-0.5~1 wt.% Ni alloys showed an excellent hydrogen generation rate of 16.6 mL/

{cm}^{2} \cdot \min

, which is about 6.4 times faster than that of pure Al (2.58 mL/

{cm}^{2} \cdot \min

). This excellent performance was achieved through the synergistic effects of galvanic and intergranular corrosion on the hydrolysis of Al. By raising the solution temperature to 50 °C, the optimal rate of hydrogen generation of Al-1 wt.% Ni in 10 wt.% NaOH solutions at 30 °C can be further increased to 54.5 mL/

{cm}^{2} \cdot \min

.

Keywords: Al-Ni alloys; hydrogen generation; galvanic corrosion; intergranular corrosion

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MDPI and ACS Style

Kwon, J.; Eom, K.; Kim, M.; Toor, I.; Oh, S.; Kwon, H. Fabrication of Al-Ni Alloys for Fast Hydrogen Production from Hydrolysis in Alkaline Water. Materials 2023, 16, 7425. https://doi.org/10.3390/ma16237425

AMA Style

Kwon J, Eom K, Kim M, Toor I, Oh S, Kwon H. Fabrication of Al-Ni Alloys for Fast Hydrogen Production from Hydrolysis in Alkaline Water. Materials. 2023; 16(23):7425. https://doi.org/10.3390/ma16237425

Chicago/Turabian Style

Kwon, JaeYoung, KwangSup Eom, MinJoong Kim, Ihsan Toor, SeKwon Oh, and HyukSang Kwon. 2023. "Fabrication of Al-Ni Alloys for Fast Hydrogen Production from Hydrolysis in Alkaline Water" Materials 16, no. 23: 7425. https://doi.org/10.3390/ma16237425

APA Style

Kwon, J., Eom, K., Kim, M., Toor, I., Oh, S., & Kwon, H. (2023). Fabrication of Al-Ni Alloys for Fast Hydrogen Production from Hydrolysis in Alkaline Water. Materials, 16(23), 7425. https://doi.org/10.3390/ma16237425

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Fabrication of Al-Ni Alloys for Fast Hydrogen Production from Hydrolysis in Alkaline Water

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