Highly selective CO2 electrocatalytic reduction on nickel single-atom catalyst in a high-temperature shockwave method. (15th April 2023)

• Record Type: Journal Article
• Authors: Wang, Jiawei; Xiao, Guoping; Gao, Na; Zhou, Jing; Xie, Mengna; Du, XianLong; Wu, Chuanqiang; Xi, Shibo; Li, Tao; Wang, Jian-Qiang
• Is Part Of: Fuel. Volume 338(2023)
• Publication Date: 2023-04-15
• Subjects: High temperature shockwave -- Single atom catalysts -- CO2RR -- High selectivity; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2022.127312
• Languages: English
• ISSNs: 0016-2361

Abstract

Highlights: A novel high-temperature shockwave method can heat to 1300 K in 0.5 s and cool to 600 K by disconnecting the current in 5 s via programmed. Based on XAFS and HADDF-STEM measurements, 6 T -Ni-NBC-1:5 catalyst showed the excellent performance in CO2RR. Abstract: Recently, the easily prepared catalysis used in CO2 electrochemical reduction with high selectivity and low cost has attracted more and more attention. Compared with the temperate wet chemical preparation method, which takes a long time and introduces some impurities, we found nickel metal catalysts can be easily and quickly synthesized on carbon black using the high-temperature shockwave method, which has the advantages of rapid heating up to 1300–1500 K within 0.5 s, no introduction of excess elements and extreme low unfavorable nitrogen dopants. Heating cycles and proportion of nitrogen source have been investigated on the catalyst morphology, particle size and electrocatalysis performance. Based on operando X-ray absorption and aberration-corrected scanning transmission electron microscopy (STEM) measurements, nickel single atom catalysts (Ni SACs) were prepared successfully and uniformly in modest heating cycles and proportion of nitrogen source. The Ni SACs exhibited remarkable performance in reducing carbon dioxide (CO2 ) to carbon monoxide (CO), with the current density of 27.5 mA/cm 2 (−1.0 V vs reversible hydrogen electrode) and CO selectivity approaching 100 % in flow cell.