Applied Catalysis B: Environmental, volume 300, pages 120695

Ultrahigh surface density of Co-N2C single-atom-sites for boosting photocatalytic CO2 reduction to methanol

Minzhi Ma 1
Zeai Huang 1
Wenjun Fa 3
Zhiqiang Rao 4
Yanzhao Zou 4
Rui Wang 4
Yunqian Zhong 4
Yuehan Cao 4
Ruiyang Zhang 4
Publication typeJournal Article
Publication date2022-01-01
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor22.1
ISSN09263373, 18733883
Catalysis
Process Chemistry and Technology
General Environmental Science
Abstract
Cobalt species as active sites for photocatalytic reduction of CO 2 to valuable products such as methanol have received increasing attention, however, it remains a huge challenge to achieve the high activity. Herein, a pyrolysis-induced-vaporization strategy was successfully employed to fabricate Co/g-C 3 N 4 single-atom catalysts (Co/g-C 3 N 4 SACs) with surface Co atom loading up to 24.6 wt%. Systematic investigation of Co/g-C 3 N 4 SACs formation process disclosed that concentrated-H 2 SO 4 exfoliation of g-C 3 N 4 nanosheets (g-C 3 N 4 NSs) as the substrate followed by a two-step calcination process is essential to achieve ultrahigh metal loading. It was found that the ultrahigh-density of Co single-atom sites were anchored on the g-C 3 N 4 substrate surface and coordinated with two nitrogen and one carbon atoms (Co-N 2 C). These single dispersed Co-N 2 C sites on the g-C 3 N 4 surface were found to act not only as electron gathering centers but also as the sites of CO 2 adsorption and activation, subsequently, boosting the photocatalytic methanol generation during light irradiation. As a result, the methanol formation rate at 4 h (941.9 μmol g −1 ) over Co/g-C 3 N 4 -0.2 SAC with 24.6 wt% surface Co loading was 13.4 and 2.2 times higher than those of g-C 3 N 4 (17.7 μmol g −1 ) and aggregated CoO x /g-C 3 N 4 -0.2 (423.9 μmol g −1 ), respectively. Simultaneously, H 2 (18.9 μmol g −1 h −1 ), CO (2.9 μmol g −1 h −1 ), CH 4 (3.4 μmol g −1 h −1 ), C 2 H 4 (1.1 μmol g −1 h −1 ), C 3 H 6 (1.4 μmol g −1 h −1 ), and CH 3 OCH 3 (3.3 μmol g −1 h −1 ) products were detected over Co/g-C 3 N 4 -0.2 SAC. Besides, the photocatalytic activity of the Co/g-C 3 N 4 -0.2 SAC for the reduction of CO 2 to methanol was stable within 12-cycle experiments (~48 h). This work paves a strategy to boost the photoreduction CO 2 activity via loading ultrahigh surface density single atomically dispersed cobalt active sites. • The two-step calcination process induced bulk cobalt nitrate vaporization to avoid the aggregation of Co atoms during the pyrolysis process. • The g-C 3 N 4 nanosheets as the substrate was proven to afford rich exposed N sites for anchoring single Co atoms. • Formed ultrahigh density Co-N 2 C single dispersed active sites boost the photoreduction CO 2 to methanol by localization of photogenerated electrons.

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Ma M. et al. Ultrahigh surface density of Co-N2C single-atom-sites for boosting photocatalytic CO2 reduction to methanol // Applied Catalysis B: Environmental. 2022. Vol. 300. p. 120695.
GOST all authors (up to 50) Copy
Ma M., Huang Z., Doronkin D. E., Fa W., Rao Z., Zou Y., Wang R., Zhong Y., Cao Y., Zhang R., Zhou Y. Ultrahigh surface density of Co-N2C single-atom-sites for boosting photocatalytic CO2 reduction to methanol // Applied Catalysis B: Environmental. 2022. Vol. 300. p. 120695.
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RIS Copy
TY - JOUR
DO - 10.1016/j.apcatb.2021.120695
UR - https://doi.org/10.1016/j.apcatb.2021.120695
TI - Ultrahigh surface density of Co-N2C single-atom-sites for boosting photocatalytic CO2 reduction to methanol
T2 - Applied Catalysis B: Environmental
AU - Ma, Minzhi
AU - Huang, Zeai
AU - Rao, Zhiqiang
AU - Zou, Yanzhao
AU - Zhong, Yunqian
AU - Zhang, Ruiyang
AU - Zhou, Ying
AU - Doronkin, Dmitry E.
AU - Fa, Wenjun
AU - Wang, Rui
AU - Cao, Yuehan
PY - 2022
DA - 2022/01/01 00:00:00
PB - Elsevier
SP - 120695
VL - 300
SN - 0926-3373
SN - 1873-3883
ER -
BibTex
Cite this
BibTex Copy
@article{2022_Ma,
author = {Minzhi Ma and Zeai Huang and Zhiqiang Rao and Yanzhao Zou and Yunqian Zhong and Ruiyang Zhang and Ying Zhou and Dmitry E. Doronkin and Wenjun Fa and Rui Wang and Yuehan Cao},
title = {Ultrahigh surface density of Co-N2C single-atom-sites for boosting photocatalytic CO2 reduction to methanol},
journal = {Applied Catalysis B: Environmental},
year = {2022},
volume = {300},
publisher = {Elsevier},
month = {jan},
url = {https://doi.org/10.1016/j.apcatb.2021.120695},
pages = {120695},
doi = {10.1016/j.apcatb.2021.120695}
}
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