TY - JOUR
T1 - Achieving Highly Efficient Carbon Dioxide Electrolysis by in Situ Construction of the Heterostructure
AU - Yang, Xiaoxia
AU - Sun, Wang
AU - Ma, Minjian
AU - Xu, Chunming
AU - Ren, Rongzheng
AU - Qiao, Jinshuo
AU - Wang, Zhenhua
AU - Li, Zesheng
AU - Zhen, Shuying
AU - Sun, Kening
N1 - Publisher Copyright:
©
PY - 2021/5/5
Y1 - 2021/5/5
N2 - The design of active cathode catalysts, with abundant active sites and outstanding catalytic activity for CO2 electroreduction, is important to promote the development of solid oxide electrolysis cells (SOECs). Herein, A-site-deficient perovskite oxide (La0.2Sr0.8)0.9Ti0.5Mn0.4Cu0.1O3-δ (LSTMC) is synthesized and studied as a promising cathode for SOECs. Cu nanoparticles can be rapidly and uniformly in situ-exsolved under reducing conditions. The heterostructure formed by the exsoluted Cu and LSTMC provides abundant active sites for the catalytic conversion of CO2 to CO. Combined with the remarkable oxygen-ion transport capacity of the LSTMC substrate, the specially designed Cu@LSTMC cathode exhibits a dramatically improved electrochemical performance. Furthermore, first-principles calculations proposed a mechanism for the adsorption and activation of CO2 by the heterostructure. Electrochemically, the Cu@LSTMC presents a high current density of 2.82 A cm-2 at 1.8 V and 800 °C, which is about 2.5 times higher than that of LSTM (1.09A cm-2).
AB - The design of active cathode catalysts, with abundant active sites and outstanding catalytic activity for CO2 electroreduction, is important to promote the development of solid oxide electrolysis cells (SOECs). Herein, A-site-deficient perovskite oxide (La0.2Sr0.8)0.9Ti0.5Mn0.4Cu0.1O3-δ (LSTMC) is synthesized and studied as a promising cathode for SOECs. Cu nanoparticles can be rapidly and uniformly in situ-exsolved under reducing conditions. The heterostructure formed by the exsoluted Cu and LSTMC provides abundant active sites for the catalytic conversion of CO2 to CO. Combined with the remarkable oxygen-ion transport capacity of the LSTMC substrate, the specially designed Cu@LSTMC cathode exhibits a dramatically improved electrochemical performance. Furthermore, first-principles calculations proposed a mechanism for the adsorption and activation of CO2 by the heterostructure. Electrochemically, the Cu@LSTMC presents a high current density of 2.82 A cm-2 at 1.8 V and 800 °C, which is about 2.5 times higher than that of LSTM (1.09A cm-2).
KW - COadsorption
KW - direct COelectrolysis
KW - heterogeneous structure
KW - in situ exsolution
KW - solid oxide electrolysis cells
UR - http://www.scopus.com/inward/record.url?scp=85106143413&partnerID=8YFLogxK
U2 - 10.1021/acsami.1c02146
DO - 10.1021/acsami.1c02146
M3 - Article
C2 - 33886263
AN - SCOPUS:85106143413
SN - 1944-8244
VL - 13
SP - 20060
EP - 20069
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
IS - 17
ER -