1. mA�cm -2 , respectively, and j CO values were 51.7, 58.8, 60.2, and 50.6 mA�cm -2 , respectively. For the ZnO Nanorod at 50, 100, 150, and 200 mA�cm -2 , j H2 values were 20.9, 21, 26.9, and 31.4 mA�cm -2 , respectively, and j CO values were 78, 80, 73, and 68.51 mA�cm -2 , respectively. For the ZnO Nanosheet at 50, 100, 150, and 200 mA�cm -2 , j H2 values were about 23.4, 30.6, 41, and 47.9 mA�cm -2 , respectively, and j CO values were about 76.1, 69.3, 59.2, and 52 mA�cm -2 , respectively. Overall, quantitative values of FE and j showed a trend of FE CO , j CO > FE H2 , j H2 , with ZnO Nanorod exhibiting higher FE CO and j CO but lower FE H2 and j H2 than the ZnO Nanosphere and Nanosheet at the tested current density. That is, in the Nanosphere electrocatalyst, the H 2 generation rate was higher than CO generation;V Rhe;For the ZnO Nanosphere at 50, 100, 150, and 200 mA