 This study proposes a novel approach to improve the efficiency of photocatalytic hydrogen evolution from water using an ultra-thin 2D-2D-T3C2Tx-ZNin-2S4 heterostructure. The 2D-2D-T3C2Tx-ZNin-2S4 heterostructure has been shown to have increased contact area and stronger electronic interactions compared to other structures, resulting in faster charge carrier separation and higher hydrogen evolution rates. This structure also features a sulfur vacancy on the ZNin-2S4 layer, which acts as an electron trap, further increasing the efficiency of the device. Overall, this study demonstrates how the combination of ultra-thin layers and co-catalysis can be used to create more efficient photocatalytic devices. This article was authored by Tom Ming-su, Chen Jing-men, Lu Yun-chen, and others.