[1] L Ai, R Shi, J Yang et al. Efficient combination of g-C3N4 and CDs for enhanced photocatalytic performance: a review of synthesis, strategies, and applications. Small, 17, 2007523(2021).
[2] J Y Y Loh, N P Kherani, G A Ozin. Persistent CO2 photocatalysis for solar fuels in the dark. Nat Sustain, 4, 466(2021).
[3] M S Nasir, G Yang, I Ayub et al. Recent development in graphitic carbon nitride based photocatalysis for hydrogen generation. Appl Catal B, 257, 117855(2019).
[4] Y Huang, J Liu, Y Deng et al. The application of perovskite materials in solar water splitting. J Semicond, 41, 011701(2020).
[5] M Ma, Y Huang, J Liu et al. Engineering the photoelectrochemical behaviors of ZnO for efficient solar water splitting. J Semicond, 41, 091702(2020).
[6] Y Yang, H Tan, B Cheng et al. Near-infrared-responsive photocatalysts. Small Methods, 5, 2001042(2021).
[7] J Zhang, J Cui, S Eslava. Oxygen evolution catalysts at transition metal oxide photoanodes: their differing roles for solar water splitting. Adv Energy Mater, 11, 2003111(2021).
[8] Y Huang, J Liu, D Cao et al. Separation of hot electrons and holes in Au/LaFeO3 to boost the photocatalytic activities both for water reduction and oxidation. Int J Hydrogen Energy, 44, 13242(2019).
[9] G Liao, Y Gong, L Zhang et al. Semiconductor polymeric graphitic carbon nitride photocatalysts: the “holy grail” for the photocatalytic hydrogen evolution reaction under visible light. Energy Environ Sci, 12, 2080(2019).
[10] W J Ong, L L Tan, Y H Ng et al. Graphitic carbon nitride (g-C3N4)-based photocatalysts for artificial photosynthesis and environmental remediation: are we a step closer to achieving sustainability. Chem Rev, 116, 7159(2016).
[11] X Wang, K Maeda, A Thomas et al. A metal-free polymeric photocatalyst for hydrogen production from water under visible light. Nat Mater, 8, 76(2009).
[12] A Savateev, I Ghosh, B König et al. Photoredox catalytic organic transformations using heterogeneous carbon nitrides. Angew Chem Int Ed, 57, 15936(2018).
[13] L Lin, Z Yu, X Wang. Crystalline carbon nitride semiconductors for photocatalytic water splitting. Angew Chem Int Ed, 58, 6164(2019).
[14] V W H Lau, B V Lotsch. A Tour-guide through carbon nitride-land: structure- and dimensionality-dependent properties for photo(electro)chemical energy conversion and storage. Adv Energy Mater, 2101078(2021).
[15] H Che, G Che, P Zhou et al. Nitrogen doped carbon ribbons modified g-C3N4 for markedly enhanced photocatalytic H2-production in visible to near-infrared region. Chem Eng J, 382, 122870(2019).
[16] A Kumar, P Raizada, A Hosseini-Bandegharaei et al. C-, N-Vacancy defect engineered polymeric carbon nitride towards photocatalysis: viewpoints and challenges. J Mater Chem A, 9, 111(2021).
[17] H Yu, R Shi, Y Zhao et al. Alkali-assisted synthesis of nitrogen deficient graphitic carbon nitride with tunable band structures for efficient visible-light-driven hydrogen evolution. Adv Mater, 29, 1605148(2017).
[18] X Pan, M Q Yang, X Fu et al. Defective TiO2 with oxygen vacancies: synthesis, properties and photocatalytic applications. Nanoscale, 5, 3601(2013).
[19] P Yang, H Zhuzhang, R Wang et al. Carbon vacancies in a melon polymeric matrix promote photocatalytic carbon dioxide conversion. Angew Chem Int Ed, 58, 1134(2018).
[20] F Li, X Yue, D Zhang et al. Targeted regulation of exciton dissociation in graphitic carbon nitride by vacancy modification for efficient photocatalytic CO2 reduction. Appl Catal B, 292, 120179(2021).
[21] Z Yang, D Chu, G Jia et al. Significantly narrowed bandgap and enhanced charge separation in porous, nitrogen-vacancy red g-C3N4 for visible light photocatalytic H2 production. Appl Surf Sci, 504, 144407(2020).
[22] P Niu, M Qiao, Y Li et al. Distinctive defects engineering in graphitic carbon nitride for greatly extended visible light photocatalytic hydrogen evolution. Nano Energy, 44, 73(2018).
[23] P Niu, L C Yin, Y Q Yang et al. Increasing the visible light absorption of graphitic carbon nitride (melon) photocatalysts by homogeneous self-modification with nitrogen vacancies. Adv Mater, 26, 8046(2014).
[24] P Zhou, F Lv, N Li et al. Strengthening reactive metal-support interaction to stabilize high-density Pt single atoms on electron-deficient g-C3N4 for boosting photocatalytic H2 production. Nano Energy, 56, 127(2019).
[25] Y Huang, J Liu, C Zhao et al. Facile synthesis of defect-modified thin-layered and porous g-C3N4 with synergetic improvement for photocatalytic H2 production. ACS Appl Mater Interfaces, 12, 52603(2020).
[26] L Duan, G Li, S Zhang et al. Preparation of S-doped g-C3N4 with C vacancies using the desulfurized waste liquid extracting salt and its application for NO
[27] D Zhang, Y Guo, Z Zhao. Porous defect-modified graphitic carbon nitride via a facile one-step approach with significantly enhanced photocatalytic hydrogen evolution under visible light irradiation. Appl Catal B, 226, 1(2018).
[28] P Hu, C Chen, R Zeng et al. Facile synthesis of bimodal porous graphitic carbon nitride nanosheets as efficient photocatalysts for hydrogen evolution. Nano Energy, 50, 376(2018).
[29] X Wang, J Meng, X Zhang et al. Controllable approach to carbon-deficient and oxygen-doped graphitic carbon nitride: robust photocatalyst against recalcitrant organic pollutants and the mechanism insight. Adv Funct Mater, 31, 2010763(2021).
[30] Y Zhou, L Zhang, W Wang. Direct functionalization of methane into ethanol over copper modified polymeric carbon nitride via photocatalysis. Nat Commun, 10, 506(2019).
[31] Y Wang, S Z F Phua, G Dong et al. Structure tuning of polymeric carbon nitride for solar energy conversion: from nano to molecular scale. Chem, 5, 2775(2019).
[32] S Cao, J Low, J Yu et al. Polymeric photocatalysts based on graphitic carbon nitride. Adv Mater, 27, 2150(2015).
[33] Z Zhou, Y Zhang, Y Shen et al. Molecular engineering of polymeric carbon nitride: advancing applications from photocatalysis to biosensing and more. Chem Soc Rev, 47, 2298(2018).
[34] Z Lin, X Wang. Nanostructure engineering and doping of conjugated carbon nitride semiconductors for hydrogen photosynthesis. Angew Chem Int Ed, 52, 1735(2013).
[35] Z A Lan, G Zhang, X Wang. A facile synthesis of Br-modified g-C3N4 semiconductors for photoredox water splitting. Appl Catal B, 192, 116(2016).
[36] Y Deng, J Liu, Y Huang et al. Engineering the photocatalytic behaviors of g/C3N4-based metal-free materials for degradation of a representative antibiotic. Adv Funct Mater, 30, 2002353(2020).
[37] J Ran, T Y Ma, G Gao et al. Porous P-doped graphitic carbon nitride nanosheets for synergistically enhanced visible-light photocatalytic H2 production. Energy Environ Sci, 8, 3708(2015).
[38] D Zhao, C L Dong, B Wang et al. Synergy of dopants and defects in graphitic carbon nitride with exceptionally modulated band structures for efficient photocatalytic oxygen evolution. Adv Mater, 31, 1903545(2019).
[39] C Feng, L Tang, Y Deng et al. Synthesis of leaf-vein-like g-C3N4 with tunable band structures and charge transfer properties for selective photocatalytic H2O2 evolution. Adv Funct Mater, 30, 2001922(2020).
[40] D Zhao, Y Wang, C L Dong et al. Boron-doped nitrogen-deficient carbon nitride-based Z-scheme heterostructures for photocatalytic overall water splitting. Nat Energy, 6, 388(2021).
[41] T Xiong, W Cen, Y Zhang et al. Bridging the g-C3N4 interlayers for enhanced photocatalysis. ACS Catal, 6, 2462(2016).
[42] M Zhang, X Bai, D Liu et al. Enhanced catalytic activity of potassium-doped graphitic carbon nitride induced by lower valence position. Appl Catal B, 164, 77(2015).
[43] S Hu, X Chen, Q Li et al. Fe3+ doping promoted N2 photofixation ability of honeycombed graphitic carbon nitride: The experimental and density functional theory simulation analysis. Appl Catal B, 201, 58(2017).
[44] Z Li, C Kong, G Lu. Visible photocatalytic water splitting and photocatalytic two-electron oxygen formation over Cu- and Fe-doped g-C3N4. J Phys Chem C, 120, 56(2016).
[45] W Yan, L Yan, C Jing. Impact of doped metals on urea-derived g-C3N4 for photocatalytic degradation of antibiotics: Structure, photoactivity and degradation mechanisms. Appl Catal B, 244, 475(2019).
[46] Z Ding, X Chen, M Antonietti et al. Synthesis of transition metal-modified carbon nitride polymers for selective hydrocarbon oxidation. ChemSusChem, 4, 274(2011).
[47] S Cao, Q Huang, B Zhu et al. Trace-level phosphorus and sodium co-doping of g-C3N4 for enhanced photocatalytic H2 production. J Power Sources, 351, 151(2017).
[48] G Dong, K Zhao, L Zhang. Carbon self-doping induced high electronic conductivity and photoreactivity of g-C3N4. Chem Commun, 48, 6178(2018).
[49] S Hu, J Zhu, L Wu et al. Effect of fluorination on photocatalytic degradation of rhodamine B over In(OH)
[50] L Lin, Z Lin, J Zhang et al. Molecular-level insights on the reactive facet of carbon nitride single crystals photocatalysing overall water splitting. Nat Catal, 3, 649(2020).
[51] G Zhang, G Li, Z A Lan et al. Optimizing optical absorption, exciton dissociation, and charge transfer of a polymeric carbon nitride with ultrahigh solar hydrogen production activity. Angew Chem Int Ed, 56, 13445(2017).
[52] G Zhang, L Lin, G Li et al. Ionothermal synthesis of triazine–heptazine-based copolymers with apparent quantum yields of 60 % at 420 nm for solar hydrogen production from “Sea Water”. Angew Chem Int Ed, 57, 9372(2018).
[53] Y Xu, X He, H Zhong et al. Solid salt confinement effect: An effective strategy to fabricate high crystalline polymer carbon nitride for enhanced photocatalytic hydrogen evolution. Appl Catal B, 246, 349(2019).
[54] J Yuan, Y Tang, X Yi et al. Crystallization, cyanamide defect and ion induction of carbon nitride: Exciton polarization dissociation, charge transfer and surface electron density for enhanced hydrogen evolution. Appl Catal B, 251, 206(2019).
[55] L Lin, W Ren, C Wang et al. Crystalline carbon nitride semiconductors prepared at different temperatures for photocatalytic hydrogen production. Appl Catal B, 231, 234(2018).
[56] D Vidyasagar, T Bhoyar, G Singh et al. Recent progress in polymorphs of carbon nitride: synthesis, properties, and their applications, macromol. Rapid Commun, 42, 2000676(2021).
[57] S Kumar, V R Battula, K Kailasam. Single molecular precursors for CxNy materials- Blending of carbon and nitrogen beyond g-C3N4. Carbon, 183, 332(2021).
[58] J Mahmood, E K Lee, M Jung et al. Nitrogenated holey two-dimensional structures. Nat Commun, 6, 6486(2015).
[59] J Xu, J Mahmood, Y Dou et al. 2D frameworks of C2N and C3N as new anode materials for lithium-ion batteries. Adv Mater, 29, 1702007(2017).
[60] Z Fang, Y Li, J Li et al. Capturing visible light in low-band-gap C4N-derived responsive bifunctional air electrodes for solar energy conversion and storage. Angew Chem Int Ed, 60, 17615(2021).
[61] P Kumar, E Vahidzadeh, U K Thakur et al. C3N5: A low bandgap semiconductor containing an azo-linked carbon nitride framework for photocatalytic, photovoltaic and adsorbent applications. J Am Chem Soc, 141, 5415(2019).
[62] S N Talapaneni, G P Mane, D H Park et al. Diaminotetrazine based mesoporous C3N6 with a well-ordered 3D cubic structure and its excellent photocatalytic performance for hydrogen evolution. J Mater Chem A, 5, 18183(2017).
[63] Y Li, C Mo, J Li et al. Pyrazine–nitrogen–rich exfoliated C4N nanosheets as efficient metal–free polymeric catalysts for oxygen reduction reaction. J Energy Chem, 49, 243(2020).
[64] J Zhang, B Jing, Z Tang et al. Experimental and DFT insights into the visible-light driving metal-free C3N5 activated persulfate system for efficient water purification. Appl Catal B, 289, 120023(2021).
[65] J Mahmood, E K Lee, M Jung et al. Two-dimensional polyaniline (C3N) from carbonized organic single crystals in solid state. PNAS, 113, 7414(2016).