Two novel Pb(II) coordination polymers (CPs) based on 4-(4-oxopyridin-1(4H)-yl) and 3-(4-oxopyridin-1(4H)-yl) phthalic acid: Band gaps, structures, and their photoelectrocatalytic properties in CO2-saturated system

Two novel Pb(II) coordination polymers (CPs 1 and 2) were solvothermally synthesized and density functional theory (DFT) calculations exhibited the two CPs possessed different band structures. Their VB and CB positions were determined by Mott-Schottky and UV-visible diffuse reflectance analyses. The E = −1.4 V vs SCE (−0.74 V vs NHE) was selected as the required potential according to the regulation of photocurrent responses at various tested potentials in CO2-saturated system. The photoelectrocatalytic performance of CP 2 was superior to that of CP 1 owing to the well-matched CB position of CP 2 and CO2 reduction potentials at the required potential of −1.4 V vs SCE (−0.74 V vs NHE). Moreover, the photoelectrolytic experiment were also performed 1 h in the CO2-saturated 0.2 M Na2SO4 solution to initially investigated the influence of visible light and the reason of stability in 1 h chronoamperometry.182