Journal
JOURNAL OF CO2 UTILIZATION
Volume 54, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2021.101745
Keywords
CO2 reduction; Black phosphorus; Amino; Photocatalyst
Funding
- National Natural Science Foundation of China [22075113, 22178152]
- Jiangsu Fund for Distinguished Young Scientists [BK20190045]
- Natural Science Foundation of Jiangsu Province [BK20190981]
- High-tech Research Key laboratory of Zhenjiang [SS2018002]
- China Postdoctoral Science Foundation [2019M661765]
- Jiangsu Provincial Agricultural Science and Technology Independent Innovation Fund [CX(21)3067]
- Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province [KFKT2019002]
- Jiangsu Government Scholarship for Overseas Studies [JS-2020-203]
- Jiangsu University Studyabroad Scholarship for oversea study [UJS-2020-001]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX20_3043]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- High-Performance Computing Platform of Jiangsu University
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NH3 plasma treatment can exfoliate bulk black phosphorus into ultrathin nanosheets with amino-functional groups, enhancing the exposure of active sites for photocatalytic CO2 reduction. The amino-functional groups can also protect the nanosheets from degradation in the environment, promoting charge separation and CO2 activation.
As an emerging two-dimensional (2D) semiconductor, black phosphorus (BP) has attracted great interest in photocatalytic CO2 reduction, but the performance is restricted by the low surface reactivity and poor stability. Exfoliating BP into the 2D structure is an effective method to increase the exposure of active sites. However, the intrinsic surface reactivity and stability cannot be improved, and, the widely used liquid-phase exfoliation method is time-consuming and laborious. In this work, we successfully exfoliates the bulk BP into ultrathin BP nanosheets with dense surface amino-functional groups (BP-NH2) using NH3 plasma treatment. The 2D structure can shorten the photo-excited charges migration distance and improve the exposure of surface-active sites. Furthermore, the amino-functional groups on ultrathin BP nanosheets can prevent the destruction of BP nanosheets in ambient air, favoring the charge separation, CO2 adsorption and activation during the catalytic process. Benefiting from integrated advantages of amino functional groups, the optimal BP-NH2 exhibits a photocatalytic CO2 reduction rate to CO of 27.6 mu mol g(-1) h(-1) with a selectivity of 87.0 %, both of which are higher than those of pristine bulk BP. This work presents ideas for stabilizing BP and improving the CO2 reduction performance simultaneously.
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