Few-layer oxygen vacant Bi2O2(OH)NO3 for dual-channel piezocatalytic H2O2 production from H2O and air

doi:10.1016/S1872-2067(25)64750-4

Abstract

Abstract:

In comparison with traditional anthraquinone methods or electrocatalytic approaches, piezocatalysis for H₂O₂ generation has garnered extensive attention as an environmentally friendly strategy. It is highly anticipated to develop piezocatalysts with strong piezoresponse, high stress sensitivity and high catalytic activity. Here, we present few-layer Bi₂O₂(OH)NO₃ (BON) nanosheets (~3-4 unit-cell layers) with oxygen vacancies, synthesized via a one-step method, as an efficient piezoelectric catalyst for dual-channel H₂O₂ production from H₂O and air. The few-layer structure endows BON with exceptional mechanical energy harvesting capabilities, while the larger specific surface area facilitates amplifying the modification effects induced by oxygen vacancies. The introduced vacancies boost surface structure asymmetry, creating localized polarization fields and strengthening piezoelectric potential. Simultaneously, the intrinsic effect of oxygen vacancies efficiently facilitates the adsorption and activation of O₂, H₂O, and intermediates, thereby enhancing the piezoelectric catalytic activity. Thus, the optimized BON exhibits a H₂O₂ yield of 1345.24 μmol·g^-1 from pure water and air via two-electron oxygen reduction and two-electron water oxidation reactions, approximately five times higher than the original BON and surpassing the majority of reported piezoelectric catalysts. This work highlights the importance of microstructure control and defect engineering, and emphasizes the crucial role of structure and oxygen vacancy concentration regulation in enhancing the performance of piezoelectric catalysis for H₂O₂ production. It provides valuable guidance for designing high-performance catalysts tailored for sustainable environmental remediation.

Key words: Bi₂O₂(OH)NO₃, Few-layer structure, Oxygen vacancy, Piezoelectric polarization, H₂O₂ piezocatalysis

Li Yuanrui, Zhang Xiaolei, Li Tong, Hu Cheng, Chen Fang, Cai Hao, Huang Hongwei. Few-layer oxygen vacant Bi₂O₂(OH)NO₃ for dual-channel piezocatalytic H₂O₂ production from H₂O and air[J]. Chinese Journal of Catalysis, 2025, 75: 105-114.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(25)64750-4

https://www.cjcatal.com/EN/Y2025/V75/I8/105

Figures/Tables 7

Fig. 1. (a) Preparation process diagram of BON-OVx samples. TEM (b) and HRTEM (c,d) images of BON-OV2. (e) EDX elemental mapping images of Bi, O and N elements of BON-OV2. AFM images of BON (f) and BON-OV2 (g).

Fig. 2. (a) XRD diffraction patterns of samples. XPS survey spectra (b), Bi 4f (c), O 1s (d) and N 1s (e) spectra of BON and BON-OV2. (f) EPR spectra of BON and BON-OV2. (g) Band gaps of BON and BON-OV2. (h) Mott-Schottky plots of BON and BON-OV2 measured at frequencies of 800 Hz and 1000 Hz. (i) Diagrams of the band structures of BON and BON-OV2.

Fig. 3. (a,b) H2O2 yield of control experiment and as-prepared samples. (c) H2O2 yield as a function of ultrasound power on BON-OV2. (d) Cycling runs of piezocatalytic H2O2 production over BON-OV2. (e) Piezocatalytic H2O2 production performance comparison over different piezocatalysts.

Fig. 4. (a) Trapping experiments of active species. (b,c) ESR spectra of BON and BON-OV2 for detection of ·O2- and ·OH. (d) Piezocatalytic H2O2 yield under different atmospheres. RRDE curves (e) and electron transfer numbers (f) at different potentials of BON and BON-OV2. LSV curves (g), I-T curves (h) and EIS plots (i) of BON and BON-OV2.

Fig. 5. Potential distribution and corresponding lines of BON-OV2 (a) and BON (b). The butterfly amplitude loop and phase curve of BON-OV2 (c) and BON (d). The simulated potential distribution of BON-OV2 (e) and BON (f). (g) Piezoelectric performance enhancement mechanism diagram.

Fig. 6. Charge difference and associated electron transfer of O2 molecules adsorbed on BON (a) and BON-OV (b). Electronic band structure and PDOS of BON-OV (c,d) and BON (e,f).

Fig. 7. Schematic diagram of piezocatalytic H2O2 production mechanism of BON-OV.

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Few-layer oxygen vacant Bi₂O₂(OH)NO₃ for dual-channel piezocatalytic H₂O₂ production from H₂O and air

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