Journal
CHEMICAL ENGINEERING JOURNAL
Volume 396, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.125365
Keywords
In-plane coupling electric field; Directional charge transfer; G-C3N4; H-2 fuel; H2O splitting
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Funding
- National Natural Science Foundation of China [21871155, 51972177]
- Natural Science Foundation of Ningbo City [2018A610067, 2019A610022]
- Yongjiang Scholar Plan
- Fan 3315 Plan
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Directional charge transfer across in-plane structure of g-C3N4 is still inefficient because of the uniform delocalization charge distribution around triangular caves of the pi-conjugated tri-s-triazine polymer, which severely restricts its application in solar energy conversion into H-2 fuel. Herein, an in-plane coupling electric field is introduced to boost charge directional transfer by coupling Li+ with sp(2)-hybridized N ligand at triangular cave of g-C3N4 (LiC3N4) for highly efficient H-2 bubble evolution. The constructed LiC3N4 demonstrates much high H-2-evolution efficiency with a large number of visible H-2 bubbles, which presents absolute performance advantage and industrial potential in comparison with g-C3N4 supported numerous noble metals. Density functional theory and characterizations reveal an efficient charge directional transfer from the 2p(z) orbit of sp(2)-hybridized N ligand to Li atom across in-plane structure of LiC3N4 is achieved under the coupling electric field, resulting in an efficient H-2 bubble evolution. This research strategy shows a scientific perspective to boost directional charge transfer for much effective solar energy conversion into H-2 fuel by Li+ coupling effect, which will be bound to introduce the competition for lithium resources between photocatalytic solar energy conversion and lithium batteries.
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