Fabrication of Al-Ni Alloys for Fast Hydrogen Production from Hydrolysis in Alkaline Water
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 pr...
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MDPI AG
2023-11-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/23/7425 |
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| author | JaeYoung Kwon KwangSup Eom MinJoong Kim Ihsan Toor SeKwon Oh HyukSang Kwon |
| author_facet | JaeYoung Kwon KwangSup Eom MinJoong Kim Ihsan Toor SeKwon Oh HyukSang Kwon |
| author_sort | JaeYoung Kwon |
| collection | DOAJ |
| description | 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 Al<sub>3</sub>Ni phase along the grain boundaries. The Al-0.5~1 wt.% Ni alloys showed an excellent hydrogen generation rate of 16.6 mL/<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>·</mo><mi>min</mi></mrow></semantics></math></inline-formula>, which is about 6.4 times faster than that of pure Al (2.58 mL/<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>·</mo><mi>min</mi></mrow></semantics></math></inline-formula>). 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/<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>·</mo><mi>min</mi></mrow></semantics></math></inline-formula>. |
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| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T01:47:06Z |
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| spelling | doaj.art-9530073190c14291b76e80a9991c69c12023-12-08T15:21:09ZengMDPI AGMaterials1996-19442023-11-011623742510.3390/ma16237425Fabrication of Al-Ni Alloys for Fast Hydrogen Production from Hydrolysis in Alkaline WaterJaeYoung Kwon0KwangSup Eom1MinJoong Kim2Ihsan Toor3SeKwon Oh4HyukSang Kwon5Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34051, Republic of KoreaDepartment of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of KoreaHydrogen Research Department, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of KoreaDepartment of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34051, Republic of KoreaResearch Institute of Advanced Manufacturing Technology, Surface R&D Group, Korea Institute of Industrial Technology, Incheon 21999, Republic of KoreaDepartment of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34051, Republic of KoreaHydrogen 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 Al<sub>3</sub>Ni phase along the grain boundaries. The Al-0.5~1 wt.% Ni alloys showed an excellent hydrogen generation rate of 16.6 mL/<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>·</mo><mi>min</mi></mrow></semantics></math></inline-formula>, which is about 6.4 times faster than that of pure Al (2.58 mL/<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>·</mo><mi>min</mi></mrow></semantics></math></inline-formula>). 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/<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>·</mo><mi>min</mi></mrow></semantics></math></inline-formula>.https://www.mdpi.com/1996-1944/16/23/7425Al-Ni alloyshydrogen generationgalvanic corrosionintergranular corrosion |
| spellingShingle | JaeYoung Kwon KwangSup Eom MinJoong Kim Ihsan Toor SeKwon Oh HyukSang Kwon Fabrication of Al-Ni Alloys for Fast Hydrogen Production from Hydrolysis in Alkaline Water Materials Al-Ni alloys hydrogen generation galvanic corrosion intergranular corrosion |
| title | Fabrication of Al-Ni Alloys for Fast Hydrogen Production from Hydrolysis in Alkaline Water |
| title_full | Fabrication of Al-Ni Alloys for Fast Hydrogen Production from Hydrolysis in Alkaline Water |
| title_fullStr | Fabrication of Al-Ni Alloys for Fast Hydrogen Production from Hydrolysis in Alkaline Water |
| title_full_unstemmed | Fabrication of Al-Ni Alloys for Fast Hydrogen Production from Hydrolysis in Alkaline Water |
| title_short | Fabrication of Al-Ni Alloys for Fast Hydrogen Production from Hydrolysis in Alkaline Water |
| title_sort | fabrication of al ni alloys for fast hydrogen production from hydrolysis in alkaline water |
| topic | Al-Ni alloys hydrogen generation galvanic corrosion intergranular corrosion |
| url | https://www.mdpi.com/1996-1944/16/23/7425 |
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