Inducing p-type conductivity and NIR activity of oxygen doped g-C3N4 porous micro-rods for elevated photocatalytic H2O2 production
- 1Department of Chemistry, I.T.E.R., Siksha ‘O’ Anusandhan Deemed to be University Bhubaneswar Odisha 751030 India +91-674-2350642 +91-674-2350181 +91-674-2351538
- 2Institute of Chemical Technology Mumbai, IOC Odisha Campus Bhubaneswar Bhubaneswar Odisha India
- 3Hydro & Electrometallurgy Division, CSIR-Institute of Mineral and Materials Technology (IMMT) Bhubaneswar 751013 Odisha India
Abstract
Photocatalytic H2O2 production over a semiconductor is contemplated as a sustainable approach. Graphitic carbon nitride (g-C3N4) is recently being extensively explored for H2O2 synthesis owing to its metal free nature, earth abundant, adequate band potential and visible light response. However, its application is practically constrained by sluggish charge transfer kinetics, inability for NIR utilization and inherent n-type characteristics. Herein, we report the synthesis of a p-type oxygen doped g-C3N4 (OGCN) with nanosheet-stacked microrod morphology by a gas-template-assisted thermal polymerization of dicyandiamide (DCDA) and ammonium acetate. OGCN3 microrods direct a directional flow of charge carriers with accelerated charge transfer rate. XPS analysis has confirmed the precise substitution of sp2-hybridized nitrogen by oxygen within the triazine framework, triggering a band-gap compression from 2.85 eV to 2.02 eV, that extended the light absorption to NIR range. Optimal oxygen integration induced a p-type conductivity as revealed from CV, LSV and Mott–Schottky studies. It is enriched with holes density of 5.35 × 1017 cm−3 which boosts the oxidation kinetics to produce enough protons. The lowest Tafel slope of OGCN3 revealed the favourable reaction kinetics for oxygen reduction reaction (ORR) due to which enough O2˙− species were liberated. These protons and O2˙− are essentially required for the photocatalytic production of H2O2 as demonstrated in the mechanism. Additionally, optimum oxygen doping created discrete nitrogen vacancy states that suppresses radiative recombination via carrier trapping and facilitates ORR. As a consequence, the optimized OGCN3 micro-rods exhibited an exceptional photocatalytic H2O2 production rate of 43.12 mmol g−1 h−1 representing ∼9 fold enhancement over pristine GCN.
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BibTeX
@article{mishra2026inducing,
title = {{Inducing p-type conductivity and NIR activity of oxygen doped g-C3N4 porous micro-rods for elevated photocatalytic H2O2 production}},
author = {Subhasish Mishra and Smruti Sourav and S. Sharmila and Nimai Mishra and Kali Sanjay and Rashmi Acharya},
journal = {Nanoscale advances},
year = {2026},
month = nov,
doi = {10.1039/d6na00609d},
url = {https://europepmc.org/article/PMC/PMC13730094},
note = {CC BY-NC},
}
RIS
TY - JOUR
TI - Inducing p-type conductivity and NIR activity of oxygen doped g-C3N4 porous micro-rods for elevated photocatalytic H2O2 production
AU - Subhasish Mishra
AU - Smruti Sourav
AU - S. Sharmila
AU - Nimai Mishra
AU - Kali Sanjay
AU - Rashmi Acharya
PY - 2026
DA - 2026/11/03
JO - Nanoscale advances
DO - 10.1039/d6na00609d
UR - https://europepmc.org/article/PMC/PMC13730094
AB - Photocatalytic H2O2 production over a semiconductor is contemplated as a sustainable approach. Graphitic carbon nitride (g-C3N4) is recently being extensively explored for H2O2 synthesis owing to its metal free nature, earth abundant, adequate band potential and visible light response. However, its application is practically constrained by sluggish charge transfer kinetics, inability for NIR utilization and inherent n-type characteristics. Herein, we report the synthesis of a p-type oxygen doped g-C3N4 (OGCN) with nanosheet-stacked microrod morphology by a gas-template-assisted thermal polymerization of dicyandiamide (DCDA) and ammonium acetate. OGCN3 microrods direct a directional flow of charge carriers with accelerated charge transfer rate. XPS analysis has confirmed the precise substitution of sp2-hybridized nitrogen by oxygen within the triazine framework, triggering a band-gap compression from 2.85 eV to 2.02 eV, that extended the light absorption to NIR range. Optimal oxygen integration induced a p-type conductivity as revealed from CV, LSV and Mott–Schottky studies. It is enriched with holes density of 5.35 × 1017 cm−3 which boosts the oxidation kinetics to produce enough protons. The lowest Tafel slope of OGCN3 revealed the favourable reaction kinetics for oxygen reduction reaction (ORR) due to which enough O2˙− species were liberated. These protons and O2˙− are essentially required for the photocatalytic production of H2O2 as demonstrated in the mechanism. Additionally, optimum oxygen doping created discrete nitrogen vacancy states that suppresses radiative recombination via carrier trapping and facilitates ORR. As a consequence, the optimized OGCN3 micro-rods exhibited an exceptional photocatalytic H2O2 production rate of 43.12 mmol g−1 h−1 representing ∼9 fold enhancement over pristine GCN.
SN - 2516-0230
ER -