Acta Phys. -Chim. Sin. ›› 2024, Vol. 40 ›› Issue (11): 2406005.doi: 10.3866/PKU.WHXB202406005
Special Issue: Solar fuel preparation
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Simultaneously Improving Inter-Plane Crystallization and Incorporating K Atoms in g-C3N4 Photocatalyst for Highly-Efficient H2O2 Photosynthesis
Wei Zhong, Dan Zheng, Yuanxin Ou, Aiyun Meng*(
), Yaorong Su*()
- College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, Guangdong Province, China
-
Received:2024-06-05Revised:2024-07-16Accepted:2024-07-17Published:2024-10-14 -
Contact:Email: mengaiyun@sztu.edu.cn (Aiyun Meng)suyaorong@sztu.edu.cn; Tel: +86-755-2325-6080 (Yaorong Su) -
Supported by:the National Natural Science Foundation of China(22178224); the National Natural Science Foundation of China(22272110); Guangdong Basic and Applied Basic Research Foundation(2023A1515110535); Guangdong Basic and Applied Basic Research Foundation(2020A1515110873); Shenzhen Science and Technology Program(RCBS20231211090522041); the Fundamental Research Funds for Shenzhen Technology University(20211063010047); Shenzhen Key Laboratory of Applied Technologies of Super-Diamond and Functional Crystals(ZDSYS20230626091303007); Shenzhen Science and Technology Program(20231127203830001)
Cite this article
Wei Zhong, Dan Zheng, Yuanxin Ou, Aiyun Meng, Yaorong Su. Simultaneously Improving Inter-Plane Crystallization and Incorporating K Atoms in g-C3N4 Photocatalyst for Highly-Efficient H2O2 Photosynthesis[J]. Acta Phys. -Chim. Sin. 2024, 40(11), 2406005. doi: 10.3866/PKU.WHXB202406005
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Fig 1
(a) Synthesis process of the K-incorporated highly crystalline g-C3N4 photocatalyst, SEM images of (b) CN and (c) CN-K(1:6), (d) TEM and (e) HRTEM images of CN-K(1:6). The violet, green, bright yellow, and white spheres are represented C, N, K, and H atoms, respectively."
Fig 1
Fig 2
(a, b) XRD data and (c) FT-IR spectra of the synthesized samples; XPS spectra of CN and CN-K(1:6): (d) Full survey, (e) C 1s and K 2p, (f) N 1s."
Fig 2
Fig 3
(a) Photocatalytic H2O2-production rates for the synthesized photocatalysts. (b) The H2O2 production rates of CN-K(1:6) photocatalyst under different condition. (c) Wavelength dependence of the apparent quantum yield for CN and CN-K(1:6) samples. (d) The H2O2 formation (Kf) and the decomposition (Kd) values for CN and CN-K(1:6) photocatalysts. (e) Systematic comparison of the H2O2 generation performance for g-C3N4-based photocatalysts. (f) Koutecky-Levich plots of CN and CN-K(1:6) samples. (g) EPR spectra of DMPO-O2− radicals for CN and CN-K(1:6) samples. (h) Proposed H2O2 production mechanism via 2e−-ORR process."
Fig 3
Fig 4
(a) PL, (b) TRPL, (c) SPV, (d) transient photocurrent responses, (e) electrochemical impedance spectra, (f) UV-Vis data, (g) Kubelka-Munk function vs. photon energy, (h) XPS valence band spectra, and (i) band structure alignments for the CN and CN-K(1:6) photocatalysts."
Fig 4
Fig 5
The calculated electrostatic potentials of (a) pristine CN and (b) CN-K(1:6) structures. Electronic location function (ELF) analysis of CN-K(1:6) structure for (c) top view and (d) side view."
Fig 5
Fig 6
The density of states for (a) CN and (b) CN-K (1:6). (c) O2-TPD signal of CN and CN-K (1:6). (d) The optimized structure of CN-K(1:6) and the charge density differences (e) before and (f) after O2 adsorption. (g) Calculated free energy diagrams for 2e−-ORR (H2O2 evolution) and 4e−-ORR (H2O production) of the CN and CN-K structures. Blue and yellow regions represent electron depletion and accumulation, respectively. The gray, yellow, purple, and red spheres are represented as N, C, K and O atoms, respectively."
Fig 6
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