TY - JOUR
T1 - Separated growth of Bi-Cu bimetallic electrocatalysts on defective copper foam for highly converting CO2 to formate with alkaline anion-exchange membrane beyond KHCO3 electrolyte
AU - Peng, Luwei
AU - Wang, Yaofeng
AU - Wang, Yongxia
AU - Xu, Nengneng
AU - Lou, Wenshuang
AU - Liu, Peixuan
AU - Cai, Dongqing
AU - Huang, Haitao
AU - Qiao, Jinli
N1 - Funding Information:
This work was supported by the ?Scientific and Technical Innovation Action Plan? Basic Research Field of Shanghai Science and Technology Committee (grant numbers 19JC1410500), the financial support from the National Natural Science Foundation of China (grant numbers 91645110), the Fundamental Research Funds for the Central Universities (grant numbers 2232018A3-06) andShanghai Undergraduate Training Program for Innovation and Entrepreneurship (grant numbers sh201910255195).
Funding Information:
This work was supported by the “Scientific and Technical Innovation Action Plan” Basic Research Field of Shanghai Science and Technology Committee (grant numbers 19JC1410500 ), the financial support from the National Natural Science Foundation of China (grant numbers 91645110 ), the Fundamental Research Funds for the Central Universities (grant numbers 2232018A3-06 ) and Shanghai Undergraduate Training Program for Innovation and Entrepreneurship (grant numbers sh201910255195 ).
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/7/5
Y1 - 2021/7/5
N2 - Tuning the geometric and electronic structure of bimetallic electrocatalyst to facilitate a specific reaction pathway and offer more active sites is a promising avenue for enhancing activity and selectivity of electrocatalytic CO2 reduction reaction (eCO2RR). Owing to formation of Bi-Cu interface through the separated growth of Bi and Cu atoms on defective copper foam, the Bi-Cu bimetallic electrode converts CO2 to formate with an allured Faradaic efficiency (94.37%) and partial current density (27.85 mA cm−2) at -0.91 Vversus reversible hydrogen electrode (RHE). Notably, such electrode with tight moss-like structure delivers the excellent durability under 58 h electrolysis, outperforming most of the current Bi-based catalysts. Moreover, we have experimentally shown that KOH is a better electrolyte than KHCO3 due to the lower solution resistance and more confinement of free CO2 gas, and the alkaline anion-exchange membrane is more ideal than the cation-exchange membrane counterpart, owing to the enhancement of formate selectivity by suppressing the evolution of H2. This study inspires a complete set of concepts for highly converting CO2 to formate that contains the design of effective electrocatalysts, the role of growth substrate, the effect of different electrolytes and membranes.
AB - Tuning the geometric and electronic structure of bimetallic electrocatalyst to facilitate a specific reaction pathway and offer more active sites is a promising avenue for enhancing activity and selectivity of electrocatalytic CO2 reduction reaction (eCO2RR). Owing to formation of Bi-Cu interface through the separated growth of Bi and Cu atoms on defective copper foam, the Bi-Cu bimetallic electrode converts CO2 to formate with an allured Faradaic efficiency (94.37%) and partial current density (27.85 mA cm−2) at -0.91 Vversus reversible hydrogen electrode (RHE). Notably, such electrode with tight moss-like structure delivers the excellent durability under 58 h electrolysis, outperforming most of the current Bi-based catalysts. Moreover, we have experimentally shown that KOH is a better electrolyte than KHCO3 due to the lower solution resistance and more confinement of free CO2 gas, and the alkaline anion-exchange membrane is more ideal than the cation-exchange membrane counterpart, owing to the enhancement of formate selectivity by suppressing the evolution of H2. This study inspires a complete set of concepts for highly converting CO2 to formate that contains the design of effective electrocatalysts, the role of growth substrate, the effect of different electrolytes and membranes.
KW - Alkaline anion-exchange membrane
KW - Bi-Cu bimetallic electrode
KW - Electrocatalytic CO reduction reaction
KW - KOH and KHCO
UR - http://www.scopus.com/inward/record.url?scp=85101494340&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2021.120003
DO - 10.1016/j.apcatb.2021.120003
M3 - Journal article
AN - SCOPUS:85101494340
SN - 0926-3373
VL - 288
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
M1 - 120003
ER -