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

Publication date: Available online 14 February 2018 Source:Journal of Solid State Chemistry Author(s): Zhi Shuo Yan, Ji Ying Long, Yun Gong, Jian Hua Lin Based on 4-(4-oxopyridin-1(4 H)-yl) phthalic acid (H 2 L 1 ) and 3-(4-oxopyridin-1(4 H)-yl) phthalic acid (H 2 L 2 ), two novel Pb(II) coordination polymers (CPs) formulated as [Pb4Cl4·(L1)2·H2O] n (CP 1), [Pb3Cl4·L2·H2O] n (CP 2) were solvothermally synthesized and characterized by single-crystal X-ray diffraction. The two novel Pb(II) CPs (CPs 1 and 2) possessed different structures. Density functional theory (DFT) calculations revealed the two CPs had different band structures yet the characteristic of semiconductors in common. Their valence band (VB) and conduction band (CB) positions were determined by Mott-Schottky and UV-visible diffuse reflectance analyses. The photoelectrocatalytic performance of the two CPs towards CO2 reduction were tested by photocurrent responses at various applied potentials. And the E = −1.4V vs SCE (−0.74V 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 −1.4V vs SCE (−0.74V vs NHE). In addition, the photoelectrolytic experiment were performed 1h in the CO2-saturated 0.2M Na2SO4 solution at the ...

Source: Journal of Solid State Chemistry - February 15, 2018 Category: Chemistry Source Type: research