The photocatalytic hydrogen evolution activity of 0-CdS, 2-CdS, 4-CdS and 6-CdS sheets with 1wt% Pt was evaluated under photo -/ piezo -bi-catalytic using 80 ml of 10 % of lactic acid solution as a sacrificial agent, as present in Fig. 7. Under the visible light illumination condition, control tests have shown that no H2 output can be detected without irradiation or photocatalysts, indicating that all of as-samples are essential to the development of H2 production. The H2-evolution amounts over all as-photocatalystas photocatalyst during the whole reactions were measured and displayed in Fig. 7a. On the other hand, control tests in Fig. 7b showed that without photocatalysts, ultrasoundultrasounds can cause water to crack to produce trace hydrogen. Also, it can be seen that there is no significant change in the yield of hydrogen generated in any of the as-prepared samples, which. This means that sound waves can hardly directly increase the H2-evolution, and as-two dimensionas two-dimension sheets of CdS cannot plays as a sono-catalyst. These results are agreed with previous works [48]. Nevertheless, when ultrasound and light were applied to the system simultaneously, extra hydrogen production of all as-obtained product were apparently detected as shown in Fig.7c. To compare the piezo-/photo-bi-catalytic application and demonstrate the advantageous impact of 2D CdS nanosheet thickness on activity, the quantity of hydrogen evolution after 6 hour photo-reaction time was collected and displayed in Fig. 7d. Surprisingly, Amountthe amount of hydrogen generated of 4-CdS photocatalyst was more than one times the superposition of light and vibration. This finding shows a synergistic effect under the combined action of visible light and mechanical force provided by ultrasound vibration. This is because only part of the electrons produced by photocatalytic process travel to the surface of as samples and react with water, and DL-thiothreitol dosage directly controls the thickness of CdS NSs and indirectly impacts the activity of the evolution of H2.