Integration of Strong Electron Transporter Tetrathiafulvalene
into Metalloporphyrin-Based Covalent Organic Framework for Highly
Efficient Electroreduction of CO2
posted on 2020-03-05, 14:30authored byQiao Wu, Rui-Kuan Xie, Min-Jie Mao, Guo-Liang Chai, Jun-Dong Yi, Shao-Shuai Zhao, Yuan-Biao Huang, Rong Cao
Electroreduction
of CO2 (CO2RR) into value-added
fuels is of significant importance but remains a big challenge because
of poor selectivity, low current density, and large overpotential.
Crystalline porous covalent organic frameworks (COFs) are promising
alternative electrode materials for CO2RR owing to their
tunable and accessible single active sites. However, the poor electron-transfer
capability of COFs limits their application. Herein, a tetrathiafulvalene
(TTF) strut was integrated into a two-dimensional cobalt porphyrin-based
COF (TTF-Por(Co)-COF) to enhance its electron-transfer capability
from the TTF to the porphyrin ring. Compared with COF-366-Co without
TTF, TTF-Por(Co)-COF showed enhanced CO2RR performance
in water with 95% Faradaic efficiency of the CO2-to-CO
conversion at −0.7 V vs RHE and a partial current density of
6.88 mA cm–2 at −0.9 V vs RHE. This work
provides a new insight for the rational design of porous organic framework
materials for improving the activity of CO2RR.