Modulating the Band Structure of Metal Coordinated Salen COFs and an In Situ Constructed Charge Transfer Heterostructure for Electrocatalysis Hydrogen Evolution.
ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022;
9:e2105912. [PMID:
35657033 PMCID:
PMC9353467 DOI:
10.1002/advs.202105912]
[Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 03/15/2022] [Indexed: 05/22/2023]
Abstract
A series of crystalline, stable Metal (Metal = Zn, Cu, Ni, Co, Fe, and Mn)-Salen covalent organic framework (COF)EDA complex are prepared to continuously tune the band structure of Metal-Salen COFEDA , with the purpose of optimizing the free energy intermediate species during the hydrogen evolution reaction (HER) process. The conductive macromolecular poly(3,4-ethylenedioxythiophene) (PEDOT) is subsequently integrated into the one-dimensional (1D) channel arrays of Metal-Salen COFEDA to form heterostructure PEDOT@Metal-Salen COFEDA via the in situ solid-state polymerization method. Among the Metal-Salen COFEDA and PEDOT@Metal-Salen COFEDA complexes, the optimized PEDOT@Mn-Salen COFEDA displays prominent electrochemical activity with an overpotential of 150 mV and a Tafel slope of 43 mV dec-1 . The experimental results and density of states data show that the continuous energy band structure modulation in Metal-Salen COFEDA has the ability to make the metal d-orbital interact better with the s-orbital of H, which is conducive to electron transport in the HER process. Moreover, the calculated charge density difference indicates that the heterostructures composed of PEDOT and Metal-Salen COFEDA induce an intramolecular charge transfer and construct highly active interfacial sites.
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