4.8 Article

Biomimetic photoelectrocatalytic conversion of greenhouse gas carbon dioxide: Two-electron reduction for efficient formate production

Journal

APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 201, Issue -, Pages 70-76

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2016.08.008

Keywords

Biomimetic photoelectrocatalysis; Cobalt-containing zeolite imidazolate framework; CO2 Activation; CO2 Reduction; Heterojunction

Funding

  1. National Natural Science Foundation of China (NSFC) [21537003, 21477085]

Ask authors/readers for more resources

Resource utilization of carbon dioxide (CO2) as alternative carbon feedstock is a promising solution to problems of both the energy supply and global warming. Herein, a biomimetic photoelectrocatalytic interface was covalently constructed utilizing cobalt-containing zeolite imidazolate framework (ZIF9) as CO2 fixation and activation substrate, and Co3O4 nanowires (NWs) as the photoelectrocatalyst. Adsorption experiments demonstrated that CO2 could be concentrated on ZIF9 modified Co3O4 NWs. The CO2 surface concentration exhibited a 3.44 fold increment on this hybrid interface than that on Co3O4 NWs. Theoretical calculation elucidated ZIF9 has the capacity for activating CO2 molecule via binding Co atom to the 0 atom of CO2, resulting in the onset potential of CO2 reduction 284 mV positively shift on ZIF9-Co3O4 NWs than that on Co3O4 NWs. At a low overpotential of 290 mV, CO2 has been photoelectrocatalytically conversion to formate with high conversion rate of 72.3 mu mol L-1 cm(-2) h(-1) and high selectivity of nearly 100% in liquid products. And the heterogeneous electron transfer constant was 2.096 x 10(-3) cm s(-1). This CO2 conversion process was confirmed to be an instantaneous proton-coupled 2-electron transfer process. This work opens the opportunity for constructing biomimetic photoelectrocatalytic interface with CO2 adsorption, activation and conversion to efficient CO2 resource utilization. (C) 2016 Elsevier B.V. All rights reserved.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.8
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available