The photocatalytic conversion of carbon dioxide into formate offers substantial economic value; however, it suffers from the inherent efficiency-selectivity trade-offs. Here, we introduce phthalocyanine polymer dots coexposed with defined phthalocyanine nitrogen (N pc ) and phthalocyanine nitrogen–hydrogen (N pc ─H) sites as promising photocatalysts, achieving synergistic enhancement in efficiency and selectivity. N pc sites act as electron nodes, directing photogenerated electrons from photosen