Journal
CHEMICAL ENGINEERING JOURNAL
Volume 385, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.123940
Keywords
CO2 reduction; In situ fabrication; Cu2O@Cu; Heterostructured nanorods; Visible-light
Categories
Funding
- National Natural Science Foundation of China [21573085, 51872108]
- Wuhan Planning Project of Science and Technology [2018010401011294]
- self-determined research funds of Central China Normal University (CCNU) from the college's basic research and operation through the Chinese Ministry of Education [CCNU18TS034]
- Excellent Doctoral Dissertation Cultivation Grant from CCNU [2018CXZZ120, 2019YBZZ072]
- Hua Bo Plan of CCNU
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Cuprous oxide (Cu2O) is known to be a promising photocatalyst for CO2 reduction into solar fuels under visible-light irradiation. However, the issues of fast recombination of photogenerated carriers and photocorrosion severely limit its photocatalytic (PC) performance. Herein, we report a unique design of one-dimensional (1D) Cu2O@Cu metal-semiconductor heterostructured nanorods via a simple in situ reduction method for efficient CO2 reduction to hydrocarbons fuels. The well-defined 1D Cu2O nanorod arrays ensure excellent visible-light harvesting capability, and the in situ fabricated Cu2O@Cu heterostructure endows the catalyst with enhanced conductivity as well as highly improved separation and transfer efficiency of photogenerated carriers. Consequently, the optimized Cu2O@Cu heterostructure achieves an apparent quantum efficiency of 2.40% for CH4 and C2H4 and as high as 92% activity retained after four PC cycles. Furthermore, the CO2 reduction performance was further improved when applied a low external bias. This study not only provides a novel, low-cost, and efficient strategy to address the stability and activity issues of Cu2O, but also sheds light on the development of active and robust photocatalysts for energy conversion and storage.
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