In:
New Journal of Chemistry, Royal Society of Chemistry (RSC), Vol. 47, No. 10 ( 2023), p. 4992-4998
Abstract:
Electroreduction of CO 2 is a sustainable approach to produce syngas with tunable CO/H 2 ratios, which are required as specific reactants for the optimization of desired products. Herein, ZnO-d and ZnO-n nanomaterials were derived from zeolitic imidazolate framework-8 (ZIF-8) precursors with different morphologies, which exhibit good performance for CO 2 electroreduction to syngas when using 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim]PF 6 , 30 wt%)/acetonitrile/water (H 2 O, 5 wt%) as the supporting electrolyte. Regulation of the number of oxygen vacancies in different ZnO samples and the applied potentials during electrolysis can obviously affect the CO/H 2 ratios in syngas, which would be changed from 1/3 to 8.5/1. Meanwhile, ZnO-n with abundant oxygen vacancies displays the highest CO faradaic efficiency (FE) of 73.2% with the total current density of 9.8 mA cm −2 at −1.9 V vs. Ag/Ag + . More oxygen vacancies and higher electrochemical specific surface area of ZnO-n can provide more active sites and facilitate the adsorption of CO 2 and its intermediates. The smaller charge transfer impedance of ZnO-n can accelerate the electron and proton transfer, and thus improve the catalytic activity and the selectivity of products. In addition, the good synergistic effect between the [Bmim]PF 6 -containing electrolyte and ZnO-n can enhance the formation of syngas.
Type of Medium:
Online Resource
ISSN:
1144-0546
,
1369-9261
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
1472933-7
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