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Confinement of SnCu x O 2+ x Nanoclusters in Zeolites for High‐Efficient Electrochemical Carbon Dioxide Reduction
Ist Teil von
Advanced energy materials, 2023-06, Vol.13 (24)
Erscheinungsjahr
2023
Link zum Volltext
Quelle
Wiley Online Library Journals Frontfile Complete
Beschreibungen/Notizen
Abstract
Electrochemical reduction of carbon dioxide (CO
2
RR) to methane has achieved impressive Faradaic efficiencies of over 40% with copper‐based catalysts including Cu
2
O, copper‐silver alloys and others. Although copper‐based catalysts work effectively in the CO
2
RR, they suffer from a major disadvantage: low selectivity of desired products due to the difficulty of regulating the intermediate coverage on the catalyst surface. Here, this work presents new SnCu
x
O
2+
x
nanocluster electrocatalysts encapsulated in purely siliceous MFI zeolites (coded as SnCu
x
O
2+
x
@MFI) for a high‐efficient CO
2
RR. This allows the formation of *CO intermediates in the channels of zeolites, which further undergoes a multi‐step protonation process to generate methane, a very attractive feature for Li‐CO
2
batteries that use the CO
2
RR catalyst as the cathode. The obtained SnCu
1.5
O
3.5
@MFI catalyst possesses a desired catalytic performance with the Faradaic efficiency of CO
2
reduction to methane at 66.6 ± 3.2% in a 0.1
m
KHCO
3
electrolyte. Using the SnCu
1.5
O
3.5
@MFI as a cathode within a Li‐CO
2
battery, this work achieves a full discharge specific capacity of 23 000 mAh g
−1
at a cut‐off voltage of 2.0 V (vs Li
+
/Li) and an operational life over 100 cycles at 1000 mAh g
−1
cutoff specific capacity. This novel confinement catalyst offers a viable pathway to develop efficient CO
2
RR and Li‐CO
2
batteries with attractive properties for practical applications.