najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМОnajo-1563Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХNi(OH)2 and Co(OH)2 modified g-C3N4 for photocatalytic CO2 reductionhttps://orcid.org/0000-0003-3908-1963ZhurenokAngelina V.angelinazhurenok@gmail.comhttps://orcid.org/0009-0003-8833-6819ErmoshkinaAlina E.a.ermoshkina@g.nsu.ruhttps://orcid.org/0009-0008-2797-4557ZazulyaAlexey E.a.zazulya@g.nsu.ruhttps://orcid.org/0000-0001-8822-5148MishchenkoDenis D.q14999@yandex.ruhttps://orcid.org/0000-0002-3230-3335GerasimovEvgeny Yu.gerasimov@catalysis.ruhttps://orcid.org/0000-0001-8944-7666KozlovaEkaterina A.kozlovaea1982@yandex.ruFederal Research Center Boreskov Institute of Catalysis SB RAS, Novosibirsk, 630090, RussiaRussian FederationFederal Research Center Boreskov Institute of Catalysis SB RAS, Novosibirsk, 630090, Russia; Novosibirsk National Research State University, Novosibirsk, 630090, RussiaRussian FederationA.V. Nikolaev Institute of Inorganic Chemistry SB RAS, Novosibirsk, 630090, Russia; Novosibirsk National Research State University, Novosibirsk, 630090, RussiaRussian FederationFederal Research Center Boreskov Institute of Catalysis SB RAS, Novosibirsk, 630090, Russia; Multiaccess Center “SKIF” Boreskov Institute of Catalysis, Novosibirsk, 630559, RussiaRussian FederationFederal Research Center Boreskov Institute of Catalysis SB RAS, Novosibirsk, RussiaRussian Federation2026050320261711563Copyright © Zhurenok A.V., Ermoshkina A.E., Zazulya A.E., Mishchenko D.D., Gerasimov E.Y., Kozlova E.A., 20262026Zhurenok A.V., Ermoshkina A.E., Zazulya A.E., Mishchenko D.D., Gerasimov E.Y., Kozlova E.A.Zhurenok A.V., Ermoshkina A.E., Zazulya A.E., Mishchenko D.D., Gerasimov E.Y., Kozlova E.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/1563

This study presents the synthesis and characterization of composite photocatalysts based on g-C3N4 modified with Ni(OH)2 and Co(OH)2 for CO2 reduction under visible light (λ = 410 nm). XRD, UV-Vis spectroscopy, and high-resolution TEM analyses revealed that the deposition of hydroxides did not disrupt the g-C3N4 structure but caused a slight increase in the interlayer spacing and band gap; Ni(OH)2 formed nanoparticles of ~7 nm, whereas Co(OH)2 crystallized as larger particles of ~24 nm. TEM showed that after the photocatalytic CO2 reduction, partial agglomeration of Ni(OH)2/NiO occurs. The catalyst containing 0.1 wt.% Ni(OH)2 exhibited the highest activity – 7.04 μmol·g-1·h-1, achieving a CO2 reduction rate 1.9 times higher than that of pristine g-C3N4. The 0.5 wt.% Co(OH)2/g-C3N4 photocatalyst was achieved a 1.3-fold increase in activity compared to pristine g-C3N4. This enhancement is attributed to the formation of a II type heterojunction between g-C3N4 and Ni(OH)2, which facilitates charge transfer and suppresses recombination.

The work was financially supported by Russian Science Foundation № 24-43-03010ReferencesFilonchyk M., Peterson M.P., Zhang L., Hurynovich V., He Y., Greenhouse gases emissions and global climate change: Examining the influence of CO2, CH4, and N2O. Sci. Total Environ., 2024, 935, 173359.Filonchyk M., Peterson M.P., Zhang L., Hurynovich V., He Y., Greenhouse gases emissions and global climate change: Examining the influence of CO2, CH4, and N2O. Sci. Total Environ., 2024, 935, 173359.Schneider S.H., Greenhouse Effect: Science and Policy. Science, 1989, 243, 771-781.Schneider S.H., Greenhouse Effect: Science and Policy. Science, 1989, 243, 771-781.Zlotin S.G., Egorova K.S., Ananikov V.P., Akulov A.A., Varaksin M.V., Chupakhin O.N., Charushin V.N., Bryliakov K.P., Averin A.D., Beletskaya I.P., Dolengovski E.L., Budnikova Y.H., Sinyashin O.G., Gafurov Z.N., Kantyukov A.O., Yakhvarov D.G., Aksenov A.V., Elinson M.N., Nenajdenko V.G., Chibiryaev A.M., Nesterov N.S., Kozlova E.A., Martyanov O.N., Balova I.A., Sorokoumov V.N., Guk D.A., Beloglazkina E.K., Lemenovskii D.A., Chukicheva I.Y., Frolova L.L., Izmest'ev E.S., Dvornikova I.A., Popov A.V., Kutchin A.V., Borisova D.M., Kalinina A.A., Muzafarov A.M., Kuchurov I.V., Maximov A.L., Zolotukhina A.V., The green chemistry paradigm in modern organic synthesis. Russ. Chem. Rev., 2023, 92, RCR5104.Zlotin S.G., Egorova K.S., Ananikov V.P., Akulov A.A., Varaksin M.V., Chupakhin O.N., Charushin V.N., Bryliakov K.P., Averin A.D., Beletskaya I.P., Dolengovski E.L., Budnikova Y.H., Sinyashin O.G., Gafurov Z.N., Kantyukov A.O., Yakhvarov D.G., Aksenov A.V., Elinson M.N., Nenajdenko V.G., Chibiryaev A.M., Nesterov N.S., Kozlova E.A., Martyanov O.N., Balova I.A., Sorokoumov V.N., Guk D.A., Beloglazkina E.K., Lemenovskii D.A., Chukicheva I.Y., Frolova L.L., Izmest'ev E.S., Dvornikova I.A., Popov A.V., Kutchin A.V., Borisova D.M., Kalinina A.A., Muzafarov A.M., Kuchurov I.V., Maximov A.L., Zolotukhina A.V., The green chemistry paradigm in modern organic synthesis. Russ. Chem. Rev., 2023, 92, RCR5104.Kozlova E.A., Lyulyukin M.N., Kozlov D.V., Parmon V.N., Semiconductor photocatalysts and mechanisms of carbon dioxide reduction and nitrogen fixation under UV and visible light. Russ. Chem. Rev., 2021, 90, 1520-1543.Kozlova E.A., Lyulyukin M.N., Kozlov D.V., Parmon V.N., Semiconductor photocatalysts and mechanisms of carbon dioxide reduction and nitrogen fixation under UV and visible light. Russ. Chem. Rev., 2021, 90, 1520-1543.Alekseev R.F., Saraev A.A., Kurenkova A.Y., Kozlova E.A., Heterostructures based on g-C3N4 for the photocatalytic CO2 reduction. Russ. Chem. Rev., 2024, 93, 5124.Alekseev R.F., Saraev A.A., Kurenkova A.Y., Kozlova E.A., Heterostructures based on g-C3N4 for the photocatalytic CO2 reduction. Russ. Chem. Rev., 2024, 93, 5124.Karnauskas K.B., Fossil Fuel Combustion Is Driving Indoor CO2 Toward Levels Harmful to Human Cognition. GeoHealth, 2020, 4, e2019GH000237.Karnauskas K.B., Fossil Fuel Combustion Is Driving Indoor CO2 Toward Levels Harmful to Human Cognition. GeoHealth, 2020, 4, e2019GH000237.Nunes L.J.R., The Rising Threat of Atmospheric CO2: A Review on the Causes, Impacts, and Mitigation Strategies. Environments, 2023, 10, 66.Nunes L.J.R., The Rising Threat of Atmospheric CO2: A Review on the Causes, Impacts, and Mitigation Strategies. Environments, 2023, 10, 66.Eldesouki M.H., Rashed A.E., Abd A., Moneim E., A comprehensive overview of carbon dioxide, including emission sources, capture technologies, and the conversion into value-added products. Clean Technol. Environ. Policy, 2023, 25, 3131-3148.Eldesouki M.H., Rashed A.E., Abd A., Moneim E., A comprehensive overview of carbon dioxide, including emission sources, capture technologies, and the conversion into value-added products. Clean Technol. Environ. Policy, 2023, 25, 3131-3148.Garcia-Garcia G., Fernandez C., Armstrong K., Woolass S., Analytical Review of Life-Cycle Environmental Impacts of Carbon Capture and Utilization Technologies. , 2021, , 995-1015.Garcia-Garcia G., Fernandez C., Armstrong K., Woolass S., Analytical Review of Life-Cycle Environmental Impacts of Carbon Capture and Utilization Technologies. , 2021, , 995-1015.Liu Y., Sun J., Huang H., Bai L., Zhao X., Qu B., Xiong L., Bai F., Tang J., Improving CO2 photoconversion with ionic liquid and Co single atoms. ChemSusChem, 2023, 14, 995-1015.Liu Y., Sun J., Huang H., Bai L., Zhao X., Qu B., Xiong L., Bai F., Tang J., Improving CO2 photoconversion with ionic liquid and Co single atoms. ChemSusChem, 2023, 14, 995-1015.Ulmer U., Dingle T., Duchesne P.N., Morris R.H., Tavasoli A., Wood T., Ozin G.A., Fundamentals and applications of photocatalytic CO2 methanation. Nat. Commun., 2019, 10, 3169.Ulmer U., Dingle T., Duchesne P.N., Morris R.H., Tavasoli A., Wood T., Ozin G.A., Fundamentals and applications of photocatalytic CO2 methanation. Nat. Commun., 2019, 10, 3169.Shoaib S., Shah A., Altaf M., Khan K., Hussain I., Tayyab M., Alarfaji S.S., Hassan A.M., Sohail M., Sufyan M., Najam T., Solar energy storage to chemical: Photocatalytic CO2 reduction over pristine metal-organic frameworks with mechanistic studies. J. Energy Storage, 2024, 75, 109725.Shoaib S., Shah A., Altaf M., Khan K., Hussain I., Tayyab M., Alarfaji S.S., Hassan A.M., Sohail M., Sufyan M., Najam T., Solar energy storage to chemical: Photocatalytic CO2 reduction over pristine metal-organic frameworks with mechanistic studies. J. Energy Storage, 2024, 75, 109725.Wang Y., Chen E., Tang J., Insight on Reaction Pathways of Photocatalytic CO2 Conversion. ACS Catal., 2022, 12, 7300-7316.Wang Y., Chen E., Tang J., Insight on Reaction Pathways of Photocatalytic CO2 Conversion. ACS Catal., 2022, 12, 7300-7316.Qu T., Wei S., Xiong Z., Zhang J., Zhao Y., Progress and prospect of CO2 photocatalytic reduction to methanol. Fuel Process. Technol., 2023, 251, 107933.Qu T., Wei S., Xiong Z., Zhang J., Zhao Y., Progress and prospect of CO2 photocatalytic reduction to methanol. Fuel Process. Technol., 2023, 251, 107933.Arun J., Priyadharsini P., Shyam S., Subathra M., Gopinath K.P., A review on conversion of carbon dioxide (CO2) to methanol and methane by photocatalytic reactors: a comparative analysis with algae-based CO2 sequestration. J Chem Technol Biotechnol, 2025.Arun J., Priyadharsini P., Shyam S., Subathra M., Gopinath K.P., A review on conversion of carbon dioxide (CO2) to methanol and methane by photocatalytic reactors: a comparative analysis with algae-based CO2 sequestration. J Chem Technol Biotechnol, 2025.Potapenko K., Kurenkova A., Saraev A., Aydakov E., Mishchenko D., Gerasimov E., Zhurenok A., Lomakina V., Byambajav E., Kozlova E., Efficient hydrogen production from water solutions of plant biomass components over “core-shell” Ni(OH)2/NiO/Ni modified g-C3N4 under visible light. Int. J. Hydrogen Energy, 2025, 185, 151954.Potapenko K., Kurenkova A., Saraev A., Aydakov E., Mishchenko D., Gerasimov E., Zhurenok A., Lomakina V., Byambajav E., Kozlova E., Efficient hydrogen production from water solutions of plant biomass components over “core-shell” Ni(OH)2/NiO/Ni modified g-C3N4 under visible light. Int. J. Hydrogen Energy, 2025, 185, 151954.Vasilchenko D., Zhurenok A., Saraev A., Gerasimov E., Cherepanova S., Kovtunova L., Tkachev S., Kozlova E., Platinum deposition onto g-C3N4 using a labile nitratocomplex for generation of highly active hydrogen-evolution photocatalysts. Int. J. Hydrogen Energy, 2022, 47, 11326.Vasilchenko D., Zhurenok A., Saraev A., Gerasimov E., Cherepanova S., Kovtunova L., Tkachev S., Kozlova E., Platinum deposition onto g-C3N4 using a labile nitratocomplex for generation of highly active hydrogen-evolution photocatalysts. Int. J. Hydrogen Energy, 2022, 47, 11326.Zhang Y., Ligthart D.A.J.M., Quek X.Y., Gao L., Hensen E.J.M., Influence of Rh nanoparticle size and composition on the photocatalytic water-splitting performance of Rh/graphitic carbon nitride. Int. J. Hydrogen Energy, 2014, 39, 11537–11546.Zhang Y., Ligthart D.A.J.M., Quek X.Y., Gao L., Hensen E.J.M., Influence of Rh nanoparticle size and composition on the photocatalytic water-splitting performance of Rh/graphitic carbon nitride. Int. J. Hydrogen Energy, 2014, 39, 11537–11546.Parameters R., Design S., Methods E., Recent Advances in g-C3N4 Photocatalysts: A Review of Reaction Parameters, Structure Design and Exfoliation Methods. Catalysts, 2023, 13, 1402.Parameters R., Design S., Methods E., Recent Advances in g-C3N4 Photocatalysts: A Review of Reaction Parameters, Structure Design and Exfoliation Methods. Catalysts, 2023, 13, 1402.Zhurenok A.V., Vasilchenko D.B., Kozlova E.A., Comprehensive Review on g-C3N4-Based Photocatalysts for the Photocatalytic Hydrogen Production under Visible Light. Int. J. Mol. Sci., 2022, 24, 346.Zhurenok A.V., Vasilchenko D.B., Kozlova E.A., Comprehensive Review on g-C3N4-Based Photocatalysts for the Photocatalytic Hydrogen Production under Visible Light. Int. J. Mol. Sci., 2022, 24, 346.Bhanderi D., Lakhani P., Modi C.K., Graphitic carbon nitride (g-C3N4) as an emerging photocatalyst for sustainable environmental applications: a comprehensive review. RSC Sustain., 2024, 2, 265-287.Bhanderi D., Lakhani P., Modi C.K., Graphitic carbon nitride (g-C3N4) as an emerging photocatalyst for sustainable environmental applications: a comprehensive review. RSC Sustain., 2024, 2, 265-287.Gao R.H., Ge Q., Jiang N., Cong H., Liu M., Zhang Y.Q., Graphitic carbon nitride (g-C3N4)-based photocatalytic materials for hydrogen evolution. Front. Chem., 2022, 10, 1-11.Gao R.H., Ge Q., Jiang N., Cong H., Liu M., Zhang Y.Q., Graphitic carbon nitride (g-C3N4)-based photocatalytic materials for hydrogen evolution. Front. Chem., 2022, 10, 1-11.Zhang P., Li N., Li L., Yu Y., Tuerhong R., Su X., g-C3N4-Based Photocatalytic Materials for Converting CO2 Into Energy: A Review. ChemPhysChem, 2024, 25, e202400075.Zhang P., Li N., Li L., Yu Y., Tuerhong R., Su X., g-C3N4-Based Photocatalytic Materials for Converting CO2 Into Energy: A Review. ChemPhysChem, 2024, 25, e202400075.Wudil Y.S., Ahmad U.F., Gondal M.A., Al-osta M.A., Almohammedi A., Sa R.S., Hrahsheh F., Haruna K., Mohamed M.J.S., Tuning of graphitic carbon nitride (g-C3N4) for photocatalysis: A critical review. Arabian Journal of Chemistry, 2023, 16, 104542.Wudil Y.S., Ahmad U.F., Gondal M.A., Al-osta M.A., Almohammedi A., Sa R.S., Hrahsheh F., Haruna K., Mohamed M.J.S., Tuning of graphitic carbon nitride (g-C3N4) for photocatalysis: A critical review. Arabian Journal of Chemistry, 2023, 16, 104542.Asim M., Mutahir S., Shaheen I., Qunhui Y., Bououdina M., Humayun M., Recent advances over the doped g-C3N4 in photocatalysis: A review. Coord. Chem. Rev., 2025, 522, 216227.Asim M., Mutahir S., Shaheen I., Qunhui Y., Bououdina M., Humayun M., Recent advances over the doped g-C3N4 in photocatalysis: A review. Coord. Chem. Rev., 2025, 522, 216227.Zhang G., Zang S., Wang X., Layered Co(OH)2 Deposited Polymeric Carbon Nitrides for Photocatalytic Water Oxidation. ACS Catalysis, 2015, 5, 941.Zhang G., Zang S., Wang X., Layered Co(OH)2 Deposited Polymeric Carbon Nitrides for Photocatalytic Water Oxidation. ACS Catalysis, 2015, 5, 941.Yu J., Wang S., Cheng B., Lin Z., Huang F., Noble metal-free Ni(OH)2–g-C3N4 composite photocatalyst with enhanced visible-light photocatalytic H2-production activity. Catal. Sci. Technol., 2013, 3, 1782.Yu J., Wang S., Cheng B., Lin Z., Huang F., Noble metal-free Ni(OH)2–g-C3N4 composite photocatalyst with enhanced visible-light photocatalytic H2-production activity. Catal. Sci. Technol., 2013, 3, 1782.Potapenko K.O., Kurenkova A.Y., Mishchenko D.D., Gerasimov E.Y., Synthesis of effective NiO/Ni/g-C3N4 photocatalysts for CO2 reduction under visible-light irradiation. Kinet. Catal., 2024, 65, 724.Potapenko K.O., Kurenkova A.Y., Mishchenko D.D., Gerasimov E.Y., Synthesis of effective NiO/Ni/g-C3N4 photocatalysts for CO2 reduction under visible-light irradiation. Kinet. Catal., 2024, 65, 724.Vasilchenko D., Zhurenok A., Saraev A., Gerasimov E., Cherepanova S., Tkachev S., Plusnin P., Kozlova E., Highly efficient hydrogen production under visible light over g-C3N4-based photocatalysts with low platinum content. Chem. Eng. J., 2022, 445, 136721.Vasilchenko D., Zhurenok A., Saraev A., Gerasimov E., Cherepanova S., Tkachev S., Plusnin P., Kozlova E., Highly efficient hydrogen production under visible light over g-C3N4-based photocatalysts with low platinum content. Chem. Eng. J., 2022, 445, 136721.Fina F., Callear S.K., Carins G.M., Irvine J.T.S., Structural investigation of graphitic carbon nitride via XRD and neutron diffraction. Chem. Mater., 2015, 27, 2612-2618.Fina F., Callear S.K., Carins G.M., Irvine J.T.S., Structural investigation of graphitic carbon nitride via XRD and neutron diffraction. Chem. Mater., 2015, 27, 2612-2618.Alwin E., Nowicki W., Wojcieszak R., Zieliński M., Pietrowski M., Elucidating the structure of the graphitic carbon nitride nanomaterials via X-ray photoelectron spectroscopy and X-ray powder diffraction techniques. Dalt. Trans., 2020, 49, 12805-12813.Alwin E., Nowicki W., Wojcieszak R., Zieliński M., Pietrowski M., Elucidating the structure of the graphitic carbon nitride nanomaterials via X-ray photoelectron spectroscopy and X-ray powder diffraction techniques. Dalt. Trans., 2020, 49, 12805-12813.Soni A., Harish, Akash, Kumar V., Mishra R.K., Gwag J.S., Poddar N.K., Singhal R., Mukhopadhyay A.K., Kumar P., Optical band gap enhancements of chemically synthesized α-Ni(OH)₂ nanoparticles by a novel technique: Precipitator molarity variation. Luminescence, 2023, 38, 1287.Soni A., Harish, Akash, Kumar V., Mishra R.K., Gwag J.S., Poddar N.K., Singhal R., Mukhopadhyay A.K., Kumar P., Optical band gap enhancements of chemically synthesized α-Ni(OH)₂ nanoparticles by a novel technique: Precipitator molarity variation. Luminescence, 2023, 38, 1287.Suksomboon M., Kongsawatvoragul K., Duangdangchote S., Reducing the Energy Band Gap of Cobalt Hydroxide Nanosheets with Silver Atoms and Enhancing Their Electrical Conductivity with Silver Nanoparticles. ACS Omega, 2021, 6, 20804.Suksomboon M., Kongsawatvoragul K., Duangdangchote S., Reducing the Energy Band Gap of Cobalt Hydroxide Nanosheets with Silver Atoms and Enhancing Their Electrical Conductivity with Silver Nanoparticles. ACS Omega, 2021, 6, 20804.Noureldien M.S., Nassar M.Y., Ibrahim I.M., A.H. M., Tandem NiO–Ni(OH)₂/VS₂ nanosheets: a robust photocatalyst for hydrogen evolution. Mater. Adv., 2024, 5, 9107.Noureldien M.S., Nassar M.Y., Ibrahim I.M., A.H. M., Tandem NiO–Ni(OH)₂/VS₂ nanosheets: a robust photocatalyst for hydrogen evolution. Mater. Adv., 2024, 5, 9107.Xiao Z., Do H., Yusuf A., Jia H., Ma H., Jiang S., Facile synthesis of multi-layer Co(OH)₂/CeO₂-g-C₃N₄ ternary synergistic heterostructure for efficient photocatalytic oxidation of NO under visible light. J. Hazard. Mater., 2024, 462, 132744.Xiao Z., Do H., Yusuf A., Jia H., Ma H., Jiang S., Facile synthesis of multi-layer Co(OH)₂/CeO₂-g-C₃N₄ ternary synergistic heterostructure for efficient photocatalytic oxidation of NO under visible light. J. Hazard. Mater., 2024, 462, 132744.

The authors declare that there are no conflicts of interest present.