Chinese Journal of Catalysis ›› 2026, Vol. 87: 140-155.DOI: 10.1016/S1872-2067(26)65093-0
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Sue-Faye Nga,b,c, Joel Jie Fooa,b, Karlo Nolkemperc,d,e, Zahra Hajiahmadid,e, Jaya Bhartic, Nannan Houg, Jiankang Zhengg, Thomas D. Kühned,e,f, Markus Antoniettic, Christian Mark Pelicanoc,*(
), Wee-Jun Onga,b,h,i,*(
)
Received:2025-09-19
Accepted:2026-01-12
Online:2026-08-05
Published:2026-06-24
Supported by:Sue-Faye Ng, Joel Jie Foo, Karlo Nolkemper, Zahra Hajiahmadi, Jaya Bharti, Nannan Hou, Jiankang Zheng, Thomas D. Kühne, Markus Antonietti, Christian Mark Pelicano, Wee-Jun Ong. Triazole ring functionalized poly(heptazine imide): Leveraging donor- acceptor configuration toward enhanced solar-driven H2O2 synthesis[J]. Chinese Journal of Catalysis, 2026, 87: 140-155.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(26)65093-0
Fig. 1. XRD patterns (a) and structure (b) of KNa (PHI with terminal triazole units). FTIR spectra from 4000-500 cm-1 (c), 1450-1250 cm-1 (d) and 800-700 cm-1 (e) for K, Li, Na, KLi-Air, KLi, and KNa photocatalysts. (Blue atom: nitrogen; grey atom: carbon; white atom: hydrogen).
Fig. 2. UV-Vis spectra (a) and corresponding Tauc plot (b) for K, Li, Na, KLi-Air, KLi, and KNa photocatalysts. Inset of (a) is a photograph of the samples, illustrating the color differences among them.
| Catalyst | Element (wt%) | ||
|---|---|---|---|
| K | Li | Na | |
| K | 15.30 | — | — |
| Li | — | 4.91 | — |
| Na | — | — | 10.2 |
| KLi-Air | 5.58 | 1.35 | — |
| KLi | 7.74 | 1.63 | — |
| KNa | 11.00 | — | 3.25 |
| KNa12h | 9.56 | — | 1.09 |
Table 1 Chemical compositions of carbon nitride samples obtained from ICP-OES.
| Catalyst | Element (wt%) | ||
|---|---|---|---|
| K | Li | Na | |
| K | 15.30 | — | — |
| Li | — | 4.91 | — |
| Na | — | — | 10.2 |
| KLi-Air | 5.58 | 1.35 | — |
| KLi | 7.74 | 1.63 | — |
| KNa | 11.00 | — | 3.25 |
| KNa12h | 9.56 | — | 1.09 |
Fig. 6. (a) Solar-driven simultaneous H2O2 and benzaldehyde production for different carbon nitride photocatalysts. Light source: > 420 nm, 100 mW cm-2. (b) Stability test for KNa and K catalysts (Left: H2O2 concentration; Right: BAD concentration). Action spectrum (UV-Vis spectrum: left y-axis; AQE: right y-axis) of H2O2 (c) and BAD production (d) on KNa.
Fig. 7. Literature comparison based on simultaneous photocatalytic H2O2 and BAD production (a) and AQE for H2O2 production (b) (Ultrathin CN [57], TiO2 [58], NiMIL-125-NH2 [59], Bi2MoO6 [60], Hydrophobic TiO2 [61], Ti-doped Zr-based MOF [62], OPA/Fe-Zr-MOF [63], ZnIn2S4/Ni12P5/g-C3N4 [64], g-C3N4/rGO/TiO2 [65], Au doped g-C3N4 [66]). (c) Control tests. (d) Simultaneous H2O2 and furfural (FAD) production by replacing BA with furfural alcohol.
Fig. 9. Structures of KNa PHI systems with terminal amine (a) and triazole (b) units. (Blue atom: nitrogen; grey atom: carbon; white atom: hydrogen; purple atom: potassium; ochre atom: sodium).
| Atom | KNa-PHI-amine | σ | KNa-PHI-triazole | σ |
|---|---|---|---|---|
| Nitrogen | -0.53 | 0.13 | -0.51 | 0.11 |
| Carbon | 0.56 | 0.04 | 0.55 | 0.03 |
Table 2 Mean net atomic charges (in units of elemental charge [e]) for nitrogen and carbon atoms in heptazine, with standard deviations (σ). Further details are provided in Table S10.
| Atom | KNa-PHI-amine | σ | KNa-PHI-triazole | σ |
|---|---|---|---|---|
| Nitrogen | -0.53 | 0.13 | -0.51 | 0.11 |
| Carbon | 0.56 | 0.04 | 0.55 | 0.03 |
Fig. 10. Scavenger tests with the optimal KNa catalyst (5 mmol L-1 scavenger solution). (IPA: isopropanol; TBA: tert-butanol; pBQ: p-benzoquinone; AgNO: AgNO3; DPA: diphenylamine; TEOA: triethanolamine).
Fig. 11. RRDE voltammograms (a) and H2O2 selectivity and n (number of electrons transferred) (b) for K and KNa at 1600 rpm in 0.1 mol L-1 KOH electrolyte saturated with O2 (30 min purging). (EOC: onset potential).
Fig. 12. Charge transfer mechanism for simultaneous H2O2 and benzaldehyde production on the optimal KNa photocatalyst (CBM: conduction band minimum; VBM: valence band maximum; BA: benzyl alcohol; BAD: benzaldehyde).
Fig. 13. Adsorption of O2 onto the bridging nitrogen atoms of the model systems with terminal amine (a) and triazole (b) units, showing the differences in the adsorption behavior due to the influence of terminating groups.
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