期刊
CARBON
卷 167, 期 -, 页码 724-735出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.06.005
关键词
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资金
- National Key R&D Program of China [2016YFA0202900, 2016YFC1402400]
- NSFC [51672173]
- Shanghai Science and Technology Committee [17JC1400700, 18520744700, 18JC1410500]
- Science and Technology Planning Project of Guangdong Province [2016A010103018]
- Shanghai Research Institute of criminal science and technology [2016XCWZK15]
- Science and Technology Innovation Commission of Shenzhen [JCYJ20170818102640668]
Since the water splitting rate-limiting oxygen evolution remains sluggish, engineering a rational architecture for photocatalysts to fulfill water oxidation needs becomes a vital issue. Here, we detail a 0D/2D all-carbon hybrid strategy for constructing a heterostructure of carbon dots (CDots) and reduced graphene oxide (rGO) to enhance the photocatalytic water oxidation of monoclinic-BiVO4 nanosheets (CBrG). Given the visible-light-harvesting ability and up-conversion characteristics of 0D CDots, more photogenerated electron-hole pairs participated in water oxidation under visible and near-infrared light irradiation. Meanwhile, 0D CDots behaved as electron acceptors on 2D rGO to suppress the recombination of electron-hole pairs. This nature licenses for the feasible electron transfer from excited m-BiVO4 to 0D CDots via electron transfer channels of 2D rGO, facilitating the separated holes to migrate onto the m-BiVO4 surface for water oxidation. Compared with the rGO decorated m-BiVO4 nanosheets (BrG), these merits endow the CBrG with an over 212% enhancement in O-2 yield under visible light irradiation as well as notable O-2 yield under near-infrared light irradiation, and a 1.57-fold increase in apparent quantum efficiency. The enhancement is also verified by the significant growth of center dot OH radicals derived from OH-/H2O oxidation and center dot OOH/center dot O-2(-) radicals originated from O-2 reduction. This work paves a new way for the 0D/2D all-carbon hybrid architecture applied in solar energy conversion. (C) 2020 Elsevier Ltd. All rights reserved.
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