Novel Graphitic Carbon Nitride/Co-B-P Nanocomposites with Significantly Enhance Visible-Light Photocatalytic Hydrogen Production from Water Splitting

Miza A. Kombo *

Department of Natural Science, School of Natural and Social Sciences, The State University of Zanzibar, P.O.Box 146, Zanzibar, Tanzania.

Abdul A.J Mohamed

Department of Natural Science, School of Natural and Social Sciences, The State University of Zanzibar, P.O.Box 146, Zanzibar, Tanzania.

Suleiman A. Suleiman

Tanzania Atomic Energy Commission, Directorate of Radiation Control, P.O. Box 743, Arusha, Tanzania.

An-Wu Xu

Department of Chemistry Physics, Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, People’s Republic of China.

*Author to whom correspondence should be addressed.


As a promising metal-free photocatalyst for hydrogen (H2) production through water splitting under visible-light irradiation, graphitic carbon nitride (g-C3N4) photocatalysts decorated with CoBP was prepared via simple ultra sonification. This paper highlights the structures of the photocatalysts, their stability, rate of hydrogen evolution and the mechanism of charge transfer within the photocatalysts. The prepared C3N4/CoBP nanocomposite photocatalysts were characterized by using X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, scanning electron microscopy and UV–visible (UV–vis) diffuse reflectance spectroscopy. After detailed analysis, the C3N4/CoBP nanocomposite photocatalysts showed excellent photocatalytic performance, which was due to the formation of the heterostructured hybrids of g-C3N4 and CoBP. The effects of C3N4/CoBP nanohybrids on H2 evolution were evaluated. The effects improved with increasing load of CoBP until the optimal level (5 wt% CoBP with visible-light irradiation at λ ≥420 nm). The maximum and remarkable photocatalytic H2 evolution rate of 51.68 μmol h−1 was achieved, which was 3.8 times that obtained from pure g-C3N4. Moreover, the C3N4/CoBP heterostructured nanohybrids demonstrated extremely high photostability and recyclability for H2 evolution after visible light illumination. The composite hybrid accelerated the separation and transfer of photogenerated charge carriers and subsequently suppressed charge recombination. Conclusively, this study offered an opportunity for the design and synthesis of highly stable and efficient C3N4/CoBP nanocomposite photocatalysts for energy conversion and utilisation.

Keywords: Heterostructured photocatalyst, C3N4/CoBP nanocomposite, water splitting, hydrogen evolution, charge separation efficiency

How to Cite

Kombo , M. A., Mohamed , A. A., Suleiman, S. A., & Xu , A.-W. (2024). Novel Graphitic Carbon Nitride/Co-B-P Nanocomposites with Significantly Enhance Visible-Light Photocatalytic Hydrogen Production from Water Splitting. Chemical Science International Journal, 33(3), 73–88.


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Ling GZS, Oh VBY, Haw CY, Tan LL, Ong WJ. g-C3N4 Photocatalysts: Utilizing Electron–Hole Pairs for Boosted Redox Capability in Water Splitting. Energy Material Advances 2023;4:1–27. Avaialble:

Ding Q, Zou X, Ke J, Dong Y, Cui Y, Lu G, et al. S-scheme 3D/2D NiCo2O4@g-C3N4 hybridized system for boosting hydrogen production from water splitting. Renewable Energy 2023;203:677–85. Avaialble:

Fujishima A, Honda K. Electrochemical Photolysis of water at a Semiconductor electrode. Nature 1972;238:37-38.

Tahir W, Cheang TY, Li JH, Ling C, Lu XJ, Ullah I, et al. Interfacial Ti ≡ N bonding of a g-C3N4/TiH1.92 type-II heterojunction photocatalyst significantly enhanced photocatalytic hydrogen evolution from water splitting. Catalysis Science and Technology 2022;12:2023–9. Avaialble:

Kombo M, Chong HB, Ma LB, Sahar S, Fang XX, Zhao T, et al. Graphitic carbon nitride decorated with nickel(II)-(3-Pyridyl) benzimidazole complexes and pt nanoparticles as a cocatalyst for photocatalytic hydrogen production from water splitting. ACS Applied Nano Materials 2020;3:10659–67.


Kombo M, Ma LB, Liu YN, Fang XX, Ullah N, Odda AH, et al. Graphitic carbon nitride/CoTPP type-II heterostructures with significantly enhanced photocatalytic hydrogen evolution. Catalysis Science and Technology 2019;9:2196–202. Avaialble:

Wang R, Ye C, Wang H, Jiang F. Z-scheme LaCoO3/g-C3N4 for efficient full-spectrum light-simulated solar photocatalytic hydrogen generation. ACS Omega 2020;5:30373–82.


Jiang L, Wang K, Wu X, Zhang G, Yin S. Amorphous bimetallic cobalt nickel sulfide cocatalysts for significantly boosting photocatalytic hydrogen evolution performance of graphitic carbon nitride : Efficient interfacial charge transfer. ACS Applied Materials & Interfaces 2019;11: 26898–908.


Bai Y, Li C, Liu L, Yamaguchi Y, Bahri M, Yang H, et al. Photocatalytic overall water splitting under visible light enabled by a particulate conjugated polymer loaded with palladium and iridium ** Angewandte 2022. Avaialble:

Novoa-cid M, Melillo A, Alvaro M, Baldovi HG. Photocatalytic water splitting promoted by 2D and 3D porphyrin covalent organic polymers synthesized by Suzuki-Miyaura Carbon-Carbon Coupling; 2022.

Wang X, Maeda K, Thomas A, Takanabe K, Xin G, Carlsson JM, et al. A metal-free polymeric photocatalyst for hydrogen production from water under visible light. Nature Materials 2009;8:76–80.


Tahir W, Ullah S, Ullah I, Li JH, Ling C, Lu XJ, et al. Metallic WN plasmonic fabricated g-C3N4 significantly steered photocatalytic hydrogen evolution under visible and near-infrared light. Catalysis Science and Technology 2022;12:7369–78. Avaialble:

Fang XX, Ma LB, Liang K, Zhao SJ, Jiang YF, Ling C, et al. The doping of phosphorus atoms into graphitic carbon nitride for highly enhanced photocatalytic hydrogen evolution. Journal of Materials Chemistry A 2019;7:11506–12. Avaialble:

Prasad C, Tang H, Liu Q, Bahadur I, Karlapudi S, Jiang Y. A latest overview on photocatalytic application of g-C3N4 based nanostructured materials for hydrogen production. International Journal of Hydrogen Energy 2020;45:337–79. Avaialble:

Wudil YS, Ahmad UF, Gondal MA, Al-Osta MA, Almohammedi A, Sa’id RS, et al. Tuning of graphitic carbon nitride (g-C3N4) for photocatalysis: A critical review. Arabian Journal of Chemistry 2023;16: 104542 Avaialble:

Mao Z, Chen J, Yang Y, Wang D, Bie L, Fahlman BD. Novel g-C3N4/CoO Nanocomposites with Significantly Enhanced Visible-Light Photocatalytic Activity for H2 Evolution. ACS Applied Materials and Interfaces 2017;9:12427– 35. Avaialble:

Jin Z, Wei T, Lixue Li, Li F, Tao R, Xu L. Loading Co3N nanoparticles as efficient cocatalysts over Zn0.5Cd0.5S for enhanced H2 evolution under visible light. Dalton Transactions 2019;48:2676–82. Avaialble:

Li Z, Wu Y, Lu G. Highly efficient hydrogen evolution over Co(OH)2 nanoparticles modified g-C3N4 co-sensitized by Eosin Y and Rose Bengal under Visible Light Irradiation. Applied Catalysis B: Environmental 2016;188:56–64. Avaialble:

Sun H, Xu X, Yan Z, Chen X, Jiao L, Cheng F, et al. Superhydrophilic amorphous Co-B-P nanosheet electrocatalysts with Pt-like activity and durability for the hydrogen evolution reaction. Journal of Materials Chemistry A 2018;6:22062–9. Avaialble:

Chunduri A, Gupta S, Bapat O, Bhide A, Fernandes R, Patel MK, et al. A unique amorphous cobalt-phosphide-boride bifunctional electrocatalyst for enhanced alkaline water-splitting. Applied Catalysis B: Environmental 2019;259:118051. Avaialble:

Kim J, Kim H, Kim SK, Ahn SH. Electrodeposited amorphous Co-P-B ternary catalyst for hydrogen evolution reaction. Journal of Materials Chemistry A 2018;6:6282–8. Avaialble:

Liu YN, Zhou X, Shen CC, Zhao ZW, Jiang YF, Ma LB, et al. Hydrogen-bonding-assisted charge transfer: Significantly enhanced photocatalytic H 2 evolution over g-C3N 4 anchored with ferrocene-based hole relay. Catalysis Science and Technology 2018;8:2853–9. Avaialble:

Wang W, Liu P, Wu K, Tan S, Li W, Yang Y. Preparation of hydrophobic reduced graphene oxide supported Ni-B-P-O and Co-B-P-O catalysts and their high hydrodeoxygenation activities. Green Chemistry 2016;18:984–8. Avaialble:

Men Y, Su J, Du X, Liang L, Cheng G, Luo W. CoBP nanoparticles supported on three-dimensional nitrogen-doped graphene hydrogel and their superior catalysis for hydrogen generation from hydrolysis of ammonia borane. Journal of Alloys and Compounds 2018;735:1271–6.


Jia X, Sang Z, Sun L, Xu F, Pan H, Zhang C, et al. Graphene-Modified Co-B-P Catalysts for Hydrogen Generation from Sodium Borohydride Hydrolysis. Nanomaterials 2022;12:1–14.


Ma LB, Liu YN, Liang K, Fang XX, Sahar S, Kombo M, et al. Hantzsch ester as hole relay significantly enhanced photocatalytic hydrogen production. Catalysis Science and Technology 2018;8:6123–8.


Zhu X, Yu S, Gong X, Xue C. In Situ Decoration of ZnxCd1−x S with FeP for Efficient Photocatalytic Generation of Hydrogen under Irradiation with Visible Light. ChemPlusChem 2018;83:825–30. Avaialble:

Wang DH, Pan JN, Li HH, Liu JJ, Wang YB, Kang LT, et al. A pure organic heterostructure of μ-oxo dimeric iron(III) porphyrin and graphitic-C3N4 for solar H2 production from water. Journal of Materials Chemistry A 2015;4:290–6. Avaialble:

Wang W, Liu S, Nie L, Cheng B, Yu J. Enhanced photocatalytic H2 production activity of TiO2 using Ni(NO3)2 as an additive. Physical Chemistry Chemical Physics 2013;15:12033–9 Avaialble:

Ye R, Fang H, Zheng YZ, Li N, Wang Y, Tao X. Fabrication of CoTiO3/g-C3N4 Hybrid Photocatalysts with Enhanced H2 Evolution: Z-Scheme Photocatalytic Mechanism Insight. ACS Applied Materials and Interfaces 2016;8:13879–89. Avaialble:

Chen J, Zhao D, Diao Z, Wang M, Shen S. Ferrites boosting photocatalytic hydrogen evolution over graphitic carbon nitride: A case study of (Co, Ni)Fe2O4 modification. Science Bulletin 2016; 61:292–301. Avaialble:

Obregón S, Colón G. Improved H2 production of Pt-TiO2/g-C3N4-MnOx composites by an efficient handling of photogenerated charge pairs. Applied Catalysis B: Environmental 2014;144:775–82 Avaialble:

Fu J, Chang B, Tian Y, Xi F, Dong X. Novel C3N4-CdS composite photocatalysts with organic-inorganic heterojunctions: In situ synthesis, exceptional activity, high stability and photocatalytic mechanism. Journal of Materials Chemistry A 2013;1: 3083–90. Avaialble:

Huang L, Xu H, Li Y, Li H, Cheng X, Xia J, et al. Visible-light-induced WO3/g-C3N4 composites with enhanced photocatalytic activity. Dalton Transactions 2013;42: 8606–16. Avaialble: