HYDROGEN GAS EVALUATION RATE OF Al-B ALLOYS IN NaOH AQUEOUS SOLUTION


Kahveci O.

14th INTERNATIONAL CONFERENCE ON ENGINEERING & NATURAL SCIENCES, Sivas, Türkiye, 18 - 19 Temmuz 2022, cilt.0, ss.527-531

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Cilt numarası: 0
  • Basıldığı Şehir: Sivas
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.527-531
  • Erciyes Üniversitesi Adresli: Evet

Özet

In the last century, hydrogen has become very popular due to its high efficiency energy conversion by fuel cells. Al hydrolysis with alkaline solution provides fast and safe hydrogen production. It is possible to use Al alloys as an energy source by hydrogen gas generation from hydrolysis reactions. However, Al tends to be oxidized by Al-water reactions, resulting in an oxide film on the surface of Al metals, which negatively affects the hydrogen generation performance. Therefore, several different processes can be used to reduce the negative effect of the oxide film on the hydrogen generation performance. Especially, alloying of some elements with Aluminum (Al) provides a good activity for hydrogen gas generation. In this study, Pure Al (99.99%) and metallic Boron (B) (99.5%) element are used for casting Al-B alloys. Binary Al-wt.%0.1 B and Al-wt.%0.3 B alloys are obtained by adding of B element to Pure Al. Hydrogen gas is obtained from the reaction of Al and Al-B alloys with 5M-NaOH solution is measured with the help of a flow-meter. The gas evolution rate (GR) of each sample is calculated at 85oC solution temperature. Compared to pure Al, faster flow occurred in B added alloys. These results are in agreement with the hydrogen gas evolution rates. GR value of the pure Al sample is changed from 114.42 ml min-1 cm-2 to 122.53 ml min-1 cm-2 with Al-B alloying effect. The results show that B element can be used at a certain rate to increase the GR value of aluminum in alkaline media.