- Title
- Reactive sites rich porous tubular yolk-shell g-C₃N₄ via precursor recrystallization mediated microstructure engineering for photoreduction
- Creator
- Tian, Na; Xiao, Ke; Zhang, Yihe; Lu, Xingxu; Ye, Liqun; Gao, Puxian; Ma, Tianyi; Huang, Hongwei
- Relation
- Applied Catalysis B: Environmental Vol. 253, p. 196-205
- Publisher Link
- http://dx.doi.org/10.1016/j.apcatb.2019.04.036
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2019
- Description
- Photoabsorption, charge separation efficiency and surface reactive catalytic sites are three critical factors in semiconductor photocatalytic process, which determine the photocatalytic activity. For bulk g-C₃N₄ derived from direct pyrolysis of C/N rich precursors, reactive sites distributed on the lateral edges are very scarce. In this work, we report the template-free preparation of three novel structured g-C₃N₄, namely, porous tubular (PT)g-C₃N₄, porous tubular yolk-shell (PTYS)g-C₃N₄, and porous split yolk-shell (PSYS)g-C₃N₄, by an unprecedented precursor microstructure regulation of melamine crystals in a gas-pressure mediated re-crystallization process. Enhanced photoabsorption, increased surface area, largely improved separation and migration efficiencies of photoinduced charge carriers are simultaneously realized in these g-C₃N₄ structures. Noticeably, selective photo-deposition test uncovers that the porous outer-walls and inner-rods of PTYS g-C₃N₄ are enriched by abundant reductive reactive sites, which consumedly boost the photo-reduction activity. Collectively promoted by these advantages, PTYS g-C₃N₄ shows not only an efficient H₂ production activity with a high apparent quantum efficiency (AQE)of 11.8% at λ = 420 ± 15 nm, but also a superior CO₂ reduction for CO production than bulk g-C₃N₄ by a factor 5.6, which is verified by the 13C isotopic labeling. This work develops precursor microstructure engineering as a promising strategy for rational design of unordinary g-C₃N₄ structure for renewable energy production.
- Subject
- g-C₃N₄; precursor recrystallization; microstructure engineering; reactive sites; photoreduction activity; SDG 7; SDG 13; Sustainable Development Goals
- Identifier
- http://hdl.handle.net/1959.13/1411552
- Identifier
- uon:36349
- Identifier
- ISSN:0926-3373
- Rights
- © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
- Language
- eng
- Full Text
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