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Abstract:
Photocatalysis of CO2 into CH4 and O-2 on marigold-like SiC@MoS2 has recently been reported with high product yield of 323 and 621 mu Lg(-1)h(-1), respectively, where protons produced from MoS2 were directly used as hydrogen source for CO2 reduction on the SiC surfaces (JACS, 2018, 140, 14595). However, the yields are only 98.1 and 26.9 mu Lg(-1)h(-1) for CH4 and CO, respectively, if the hydrogen source is from the hydroxylated SiC (ChemComm, 2019, 55, 1572). To unravel the productivity and selectivity of the reaction, we first provide that the limiting potential of CO2 to CH4 on SiC(1 1 1) surface is -0.7 V lower than that of hydroxylated SiC(1 1 1) surface. Due to the Delta f(des) (1.68 eV) of CO is close to the Delta f(max) (1.33 eV) of the hydroxylated SiC(1 1 1) surface, a small amount of CO are produced. Furthermore, we found the reverse water-gas shift (RWfS) mechanism has much lower limiting potential than those proposed in the experiments.
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APPLIED SURFACE SCIENCE
ISSN: 0169-4332
Year: 2021
Volume: 538
7 . 3 9 2
JCR@2021
6 . 3 0 0
JCR@2023
ESI Discipline: MATERIALS SCIENCE;
ESI HC Threshold:142
JCR Journal Grade:1
CAS Journal Grade:1
Cited Count:
WoS CC Cited Count: 7
SCOPUS Cited Count: 7
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 1
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