**3. Results**

## *3.1. Hydrogen Generation Performance*

The alloys' hydrogen production yields at 40 ◦C are shown in Figure 1. The volumes of hydrogen generated from the first four samples (0–3 wt.% Zn) approach the theoretical value, implying that the alloys could hydrolyze thoroughly. As the sample was put into water, they split into small pieces at once and hydrogen bubbles started to pop up. However, the time used for completing the hydrolysis reaction is quite different. The samples containing 0 and 3 wt.% Zn have the shortest reaction time, while the sample of 2 wt.% Zn lasted tens of minutes.

**Figure 1.** Hydrogen yields of the Al-Ga-In3Sn-Zn alloys at temperatures of 40 ◦C.

Figure 2 shows the hydrogen production rate curves of the Al-Ga-In3Sn-Zn alloys at different water temperature. It can be clearly seen that the hydrogen production performance is closely related to the reaction temperature. As the reaction temperature rises, the reaction time is shortened and the reaction rate increased markedly.

#### *3.2. Characterization of Al Alloys*
