[1] [1] Wei H, Yang H, Zhang X, Zhu J, Qiu P, Luo W. Hydrogen peroxide enabled two-dimensional molybdenum trioxide nanosheet clusters for enhanced surface Li-ion storage. Tungsten. 2021;3:338–47.10.1007/s42864-021-00093-7

[2] [2] Liao G, Li C, Li X, Fang B. Emerging polymeric carbon nitride Z-scheme systems for photocatalysis. Cell Rep Phys Sci. 2021;2: 100355.10.1016/j.xcrp.2021.100355

[3] [3] Liao G, Li C, Liu S, Fang B, Yang H. Z-scheme systems: From fundamental principles to characterization, synthesis, and photocatalytic fuel-conversion applications. Phys Rep. 2022;983:1–41.10.1016/j.physrep.2022.07.003

[4] [4] Liao G, Li C, Liu S, Fang B, Yang H. Emerging frontiers of Z-scheme photocatalytic systems. Trends Chem. 2022;4:111–27.10.1016/j.trechm.2021.11.005

[5] [5] Liang J, Wang F, Li W, Zhang J, Guo C-L. Highly dispersed and stabilized Pd species on H2 pre-treated Al2O3 for anthraquinone hydrogenation and H2O2 production. Mol Catal. 2022;524:112264.10.1016/j.mcat.2022.112264

[6] [6] Dong K, Lei Y, Zhao H, Liang J, Ding P, Liu Q, Xu Z, Lu S, Li Q, Sun X. Noble-metal-free electrocatalysts toward H2O2 production. J Mater Chem A. 2020;8:23123–41.10.1039/D0TA08894C

[7] [7] Li C, Jia R, Yang Y, Liao G. A hierarchical helical carbon nanotube fiber artificial ligament. Adv Fiber Mater. 2023;5:1549.10.1007/s42765-023-00312-5

[8] [8] Wen H, Huang S, Meng X, Xian X, Zhao J, Roy VAL. Recent progress in the design of photocatalytic H2O2 synthesis system. Front Chem. 2022;10:1098209.10.3389/fchem.2022.1098209

[9] [9] Tzu-Heng W, Min-Jen C, YenJung Sean L, Ruey-an D, Paul W, Bruce R. High-efficiency photocatalytic H2O2 production in a dual optical– and membrane-fiber system. ACS Sustain Chem Eng. 2023;11:6465–73.10.1021/acssuschemeng.3c00742

[10] [10] Wei W, Zou L, Li J, Hou F, Sheng Z, Li Y, Guo Z, Wei A. Dual molecules engineered carbon nitride for achieving outstanding photocatalytic H2O2 production. J Colloid Interf Sci. 2023;636:537–48.10.1016/j.jcis.2023.01.046

[11] [11] Zhang J, Tong T, Zhang L, Li X, Zou H, Yu J. Enhanced performance of planar perovskite solar cell by graphene quantum dot modification. ACS Sustain Chem Eng. 2018;6:8631–40.10.1021/acssuschemeng.8b00938

[12] [12] He B, Wang Z, Xiao P, Chen T, Yu J, Zhang L. Cooperative coupling of H2O2 production and organic synthesis over a floatable polystyrene-sphere-supported TiO2/Bi2O3 S-scheme photocatalyst. Adv Mater. 2022;34:2203225.10.1002/adma.202203225

[13] [13] Yu W, Hu C, Bai L, Tian N, Zhang Y, Huang H. Photocatalytic hydrogen peroxide evolution: what is the most effective strategy? Nano Energy. 2022;104: 107906.10.1016/j.nanoen.2022.107906

[14] [14] Hou H, Zeng X, Zhang X. Production of hydrogen peroxide by photocatalytic processes. Angew Chem Int Ed. 2020;59:17356–76.10.1002/anie.201911609

[15] [15] Yong Z, Ma T. Solar-to-H2O2 catalyzed by covalent organic frameworks. Angew Chem Int Ed. 2023;62: e202308980.10.1002/anie.202308980

[16] [16] Liao G, Gong Y, Zhang L, Gao H, Yang G, Fang B. Semiconductor polymeric graphitic carbon nitride photocatalysts: the “holy grail” for the photocatalytic hydrogen evolution reaction under visible light. Energy Environ Sci. 2019;12:2080–147.10.1039/C9EE00717B

[17] [17] Yu L, Yuanfang L, Zonglin W, Bin H, Yang Z, Xinwen O, Jin J. Rational design of donor–acceptor engineered g-C3N4 for boosted H2O2 production via photocatalytic O2 reduction. J Environ Chem Eng. 2023;11: 109426.10.1016/j.jece.2023.109426

[18] [18] Li C, Lu H, Ding G, Li Q, Liao G. Recent advances on g-C3N4-based Z-scheme photocatalysts for organic pollutant removal. Catal Sci Technol. 2023;13:2877–98.10.1039/D3CY00242J

[19] [19] Che H, Wang J, Gao X, Chen J, Wang P, Liu B, Ao Y. Regulating directional transfer of electrons on polymeric g-C3N5 for highly efficient photocatalytic H2O2 production. J Colloid Interf Sci. 2022;627:739–48.10.1016/j.jcis.2022.07.080

[20] [20] Igor K, Ashish V, Dariusz M, Radim B. Benzaldehyde-promoted (auto)photocatalysis under visible light: pitfalls and opportunities in photocatalytic H2O2 production. ChemCatChem. 2022;15: e202201215.

[21] [21] Kelly J, McDonnell C, Skillen N, Manesiotis P, Robertson PKJ. Enhanced photocatalytic degradation of 2-methyl-4-chlorophenoxyacetic acid (MCPA) by the addition of H2O2. Chemosphere. 2021;275: 130082.10.1016/j.chemosphere.2021.130082

[22] [22] Dong J, Zhang Y, Hussain MI, Zhou W, Chen Y, Wang L-N. g-C3N4: properties, pore modifications, and photocatalytic applications. Nanomaterials. 2021;12:121.10.3390/nano12010121

[23] [23] Jianlong W, Shizong W. A critical review on graphitic carbon nitride (g-C3N4)-based materials: Preparation, modification and environmental application. Coord Chem Rev. 2021;453: 214338.

[24] [24] Kamal Hussien M, Sabbah A, Qorbani M, Hammad Elsayed M, Raghunath P, Lin T-Y, Quadir S, Wang H-Y, Wu H-L, Tzou D-LM, Lin M-C, Chung P-W, Chou H-H, Chen L-C, Chen K-H. Metal-free four-in-one modification of g-C3N4 for superior photocatalytic CO2 reduction and H2 evolution. Chem Eng J. 2021;430:132853.10.1016/j.cej.2021.132853

[25] [25] Wang N, Cheng L, Liao Y, Xiang Q. Effect of functional group modifications on the photocatalytic performance of g-C3N4. Small. 2023;19:2300109.10.1002/smll.202300109

[26] [26] Zhao X, Liu Q, Li X, Li H, Shen Z, Ji H, Ma T. Exited state absorption upconversion induced by structural defects for photocatalysis with a breakthrough efficiency. Angew Chem Int Ed. 2023;62: e202219214.10.1002/anie.202219214

[27] [27] Shen X, Zhang Y, Duoerkun G, Shi Z, Liu J, Chen Z, Wong PK, Zhang L. Vis-NIR light-responsive photocatalytic activity of C3N4–Ag–Ag2O heterojunction-decorated carbon-fiber cloth as efficient filter-membrane-shaped photocatalyst. ChemCatChem. 2019;11:1362.10.1002/cctc.201801805

[28] [28] Liu X, Xu S, Chi H, Xu T, Guo Y, Yuan Y, Yang B. Ultrafine 1D graphene interlayer in g-C3N4/graphene/recycled carbon fiber heterostructure for enhanced photocatalytic hydrogen generation. Chem Eng J. 2019;359:1352.10.1016/j.cej.2018.11.043

[29] [29] Zhang J, Huang F. Enhanced visible light photocatalytic H2 production activity of g-C3N4 via carbon fiber. Appl Surf Sci. 2015;358:287.10.1016/j.apsusc.2015.08.089

[30] [30] Zhou J, Shan T, Luo H, Boury B, Xu X, Wu H, Zhang F, Xiao H. Enhanced single-electron transfer for efficiently photocatalytic H2O2 production over g-C3N4 decorated with TEMPO-oxidized cellulosic carbon. J Environ Chem Eng. 2023;11: 109512.10.1016/j.jece.2023.109512

[31] [31] Li S, Liu P, Wang Y, Yang Q, Ma Y. Constructing defective-functionalized g-C3N4 homojunction for efficient photocatalytic detoxification of lemon yellow in an aqueous solution and beverage. Food Chem. 2023;422: 136263.10.1016/j.foodchem.2023.136263

[32] [32] Dang M, Tan G, Wang M, Zhang B, Wang Y, Lv L, Ren H, Xia A. Preparation and photocatalytic enhancement mechanism of g-C3N4/(110) facet BiVO4 heterojunction induced by electrostatic field. Mater Lett. 2021;285:129131.10.1016/j.matlet.2020.129131

[33] [33] Que M, Cai W, Chen J, Zhu L, Yang Y. Recent advances in g-C3N4 composites within four types of heterojunctions for photocatalytic CO2 reduction. Nanoscale. 2021;13:6692–712.10.1039/D0NR09177D

[34] [34] Youlan Z, Haiyan Z, Zhuoran A, Yiyang L, Nantao C, Yuxing H. N-doped porous carbon coated g-C3N4/g-C3N4 heterojunction for polysulfide restriction and catalytic conversion towards enhanced lithium–sulfur batteries. J Alloy Compd. 2023;940: 168772.10.1016/j.jallcom.2023.168772

[35] [35] Yang Q, Li R, Wei S, Yang R. Schottky functionalized Z-scheme heterojunction photocatalyst Ti2C3/g-C3N4/BiOCl: efficient photocatalytic H2O2 production via two-channel pathway. Appl Surf Sci. 2022;572: 151525.10.1016/j.apsusc.2021.151525

[36] [36] Wang J, Yang L, Zhang L. Constructed 3D hierarchical micro-flowers CoWO4@Bi2WO6 Z-scheme heterojunction catalyzer: two-channel photocatalytic H2O2 production and antibiotics degradation. Chem Eng J. 2021;420: 127639.10.1016/j.cej.2020.127639

[37] [37] Wang X, Han Z, Yu L, Liu C, Liu Y, Wu G. Synthesis of full-spectrum-response Cu2(OH)PO4/g-C3N4 photocatalyst with outstanding photocatalytic H2O2 production performance via a “two channel route.” ACS Sustain Chem Eng. 2018;6:14542–53.10.1021/acssuschemeng.8b03171

[38] [38] Zhao Y, Liu Y, Cao J, Wang H, Shao M, Huang H, Liu Y, Kang Z. Efficient production of H2O2 via two-channel pathway over ZIF-8/C3N4 composite photocatalyst without any sacrificial agent. Appl Catal B Environ. 2020;278: 119289.10.1016/j.apcatb.2020.119289

[39] [39] Cao J, Wang H, Zhao Y, Liu Y, Wu Q, Huang H, Shao M, Liu Y, Kang Z. Phosphorus-doped porous carbon nitride for efficient sole production of hydrogen peroxide via photocatalytic water splitting with a two-channel pathway. J Mater Chem A. 2020;8:3701–7.10.1039/C9TA13929J

[40] [40] Yang L, Dong G, Jacobs DL, Wang Y, Zang L, Wang C. Two-channel photocatalytic production of H2O2 over g-C3N4 nanosheets modified with perylene imides. J Catal. 2017;352:274.10.1016/j.jcat.2017.05.010

[41] [41] Cao J, Pan C, Ding Y, Li W, Lv K, Tang H. Constructing nitrogen vacancy introduced g-C3N4 p-n homojunction for enhanced photocatalytic activity. J Environ Chem Eng. 2019;7: 102984.10.1016/j.jece.2019.102984

[42] [42] Liu Z, Wang G, Chen H-S, Yang P. An amorphous/crystalline g-C3N4 homojunction for visible light photocatalysis reactions with superior activity. Chem Commun. 2018;54:4720–3.10.1039/C8CC01824C

[43] [43] Hong Y, Liu EL, Shi JY, Lin X, Sheng LZ, Zhang M, Wang LY, Chen JH. A direct one-step synthesis of ultrathin g-C3N4 nanosheets from thiourea for boosting solar photocatalytic H2 evolution. Int J Hydrogen Energy. 2019;44:7194–204.10.1016/j.ijhydene.2019.01.274

[44] [44] Zhao Z, Zhang W, Liu W, Li Y, Ye J, Liang J, Tong M. Single-atom silver induced amorphization of hollow tubular g-C3N4 for enhanced visible light-driven photocatalytic degradation of naproxen. Sci Total Environ. 2020;742: 140642.10.1016/j.scitotenv.2020.140642

[45] [45] Song M, Wang J, Chen B, Wang L. A facile, nonreactive hydrogen peroxide (H2O2) detection method enabled by ion chromatography with UV detector. Anal Chem. 2017;89:11537–44.10.1021/acs.analchem.7b02831

[46] [46] Sun Z, Wang W, Chen Q, Pu Y, He H, Zhuang W, He J, Huang L. A hierarchical carbon nitride tube with oxygen doping and carbon defects promotes solar-to-hydrogen conversion. J Mater Chem A. 2020;8:3160–7.10.1039/C9TA13012H

[47] [47] Thangavel N, Pandi K, Shaheer ARM, Neppolian B. Surface-state-induced upward band bending in P doped g-C3N4 for the formation of an isotype heterojunction between bulk g-C3N4 and P doped g-C3N4: photocatalytic hydrogen production. Catal Sci Technol. 2020;10:8015–25.10.1039/D0CY01543A

[48] [48] Yuchun R, Tao G, Songlin T, Ming C, Fei Z, Yongjun L, Li Y, Qiong P. Photocatalytic activities of g-C3N4, Bi3NbO7 and g-C3N4/Bi3NbO7 in photocatalytic reduction of Cr(VI). J Alloy Compd. 2022;902: 163752.10.1016/j.jallcom.2022.163752

[49] [49] Wang Q, Fang Z, Zhang W, Zhang D. High-efficiency g-C3N4 based photocatalysts for CO2 reduction: modification methods. Adv Fiber Mater. 2022;4:342.10.1007/s42765-021-00122-7

[50] [50] Wu L, Zhang Z, Yang M, Yuan J, Li P, Guo F, Men X. One-step synthesis of g-C3N4 nanosheets to improve tribological properties of phenolic coating. Tribol Int. 2019;132:221–7.10.1016/j.triboint.2018.12.027

[51] [51] Zhou D, Qiu C. Study on the effect of Co doping concentration on optical properties of g-C3N4. Chem Phys Lett. 2019;728:70–3.10.1016/j.cplett.2019.04.060

[52] [52] Zhang J, Wang X, Shen K, Lu W, Wang J, Chen F. Defect engineering in g-C3N4 quantum-dot-modified TiO2 nanofiber: uncovering novel mechanisms for the degradation of tetracycline in coexistence with Cu2+. Adv Fiber Mater. 2022;5:168–82.10.1007/s42765-022-00205-z

[53] [53] Alok KS, Nivedita S, Bharat K, Dinesh KV, Jiya Lal M, Sundaram S, Rashmi BR. Improvement of tribo-active behavior of g-C3N4 nanosheets using m-LaVO4 nanoparticles. Colloid Surface A. 2023;663: 131031.10.1016/j.colsurfa.2023.131031

[54] [54] Yang J, Zhang X, Xie C, Long J, Wang Y, Wei L, Yang X. Preparation of g-C3N4 with high specific surface area and photocatalytic stability. J Electron Mater. 2021;50:1067–74.10.1007/s11664-020-08654-1

[55] [55] Mohammed I. Facile synthesis of NiO-loaded g-C3N4 heterojunction photocatalyst for efficient photocatalytic degradation of 4-nitrophenol under visible-light irradiation. J Photochem Photobiol A. 2023;439: 114576.10.1016/j.jphotochem.2023.114576

[56] [56] Hu J, Chen C, Yang H, Yang F, Qu J, Yang X, Sun W, Dai L, Li CM. Tailoring well-ordered, highly crystalline carbon nitride nanoarrays via molecular engineering for efficient photosynthesis of H2O2. Appl Catal B Environ. 2022;317: 121723.10.1016/j.apcatb.2022.121723

[57] [57] Wang R, Zhang X, Li F, Cao D, Pu M, Han D, Yang J, Xiang X. Energy-level dependent H2O2 production on metal-free, carbon-content tunable carbon nitride photocatalysts. J Energy Chem. 2018;27:343.10.1016/j.jechem.2017.12.014

[58] [58] Zhang D, Ren P, Liu W, Li Y, Salli S, Han F, Qiao W, Liu Y, Fan Y, Cui Y, Shen Y, Richards E, Wen X, Rummeli MH, Li Y, Besenbacher F, Niemantsverdriet H, Lim T, Su R. Photocatalytic abstraction of hydrogen atoms from water using hydroxylated graphitic carbon nitride for hydrogenative coupling reactions. Angew Chem Int Ed. 2022;61: e202204256.10.1002/anie.202204256

[59] [59] Yue J-Y, Song L-P, Fan Y-F, Pan Z-X, Yang P, Ma Y, Xu Q, Tang B. Thiophene-containing covalent organic frameworks for overall photocatalytic H2O2 synthesis in water and seawater. Angew Chem Int Ed. 2023;62: e202309624.10.1002/anie.202309624

[60] [60] Zhang Y, Pan C, Bian G, Xu J, Dong Y, Zhang Y, Lou Y, Liu W, Zhu Y. H2O2 generation from O2 and H2O on a near-infrared absorbing porphyrin supramolecular photocatalyst. Nat Energy. 2023;8:361–71.10.1038/s41560-023-01218-7

[61] [61] Yang M, Hou Z, Zhang X, Gao B, Li Y, Shang Y, Yue Q, Duan X, Xu X. Unveiling the origins of selective oxidation in single-atom catalysis via Co–N4–C intensified radical and nonradical pathways. Environ Sci Technol. 2022;56:11635–45.10.1021/acs.est.2c01261

[62] [62] Yin K, Wu R, Shang Y, Chen D, Wu Z, Wang X, Gao B, Xu X. Microenvironment modulation of cobalt single-atom catalysts for boosting both radical oxidation and electron-transfer process in Fenton-like system. Appl Catal B Environ. 2023;329: 122558.10.1016/j.apcatb.2023.122558