Graphene Quantum Sheet Catalyzed Silicon Photocathode for Selective CO 2 Conversion to CO

Title
Graphene Quantum Sheet Catalyzed Silicon Photocathode for Selective CO 2 Conversion to CO
Authors
양기동하윤호심욱안중현이찬우진경석김영혜박지민홍정석이준호이혜은정희윤김형준남기태
Keywords
graphene; CO2 reduction; silicon; photocatalyst
Issue Date
2015-12
Publisher
Advanced functional materials
Abstract
The reduction of carbon dioxide (CO 2 ) into chemical feedstock is drawing increasing attention as a prominent method of recycling atmospheric CO 2 . Although many studies have been devoted in designing an effi cient catalyst for CO 2 conversion with noble metals, low selectivity and high energy input still remain major hurdles. One possible solution is to use the combination of an earth-abundant electrocatalyst with a photoelectrode powered by solar energy. Herein, for the fi rst time, a p-type silicon nanowire with nitrogen-doped graphene quantum sheets (N-GQSs) as heterogeneous electrocatalyst for selective CO production is demonstrated. The photoreduction of CO 2 into CO is achieved at a potential of −1.53 V versus Ag/Ag + , providing 0.15 mA cm −2 of current density, which is 130 mV higher than that of a p-type Si nanowire decorated with well-known Cu catalyst. The faradaic effi ciency for CO is 95%, demonstrating signifi cantly improved selectivity compared with that of bare planar Si. The density functional theory (DFT) calculations are performed, which suggest that pyridinic N acts as the active site and band alignment can be achieved for N-GQSs larger than 3 nm. The demonstrated high efficiency of the catalytic system provides new insights for the development of nonprecious, environmentally benign CO 2 utilization.
URI
http://pubs.kist.re.kr/handle/201004/58357
ISSN
1616301X
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KIST Publication > Article
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