Chinese Journal of Catalysis ›› 2023, Vol. 46: 177-190.DOI: 10.1016/S1872-2067(22)64199-8
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Qian Lia,c,d, Qijun Tanga,b, Peiyao Xionga,b, Dongzhi Chenc,d, Jianmeng Chenc,d, Zhongbiao Wua,b,*(), Haiqiang Wanga,b,*()
Received:
2022-09-14
Accepted:
2022-11-24
Online:
2023-03-18
Published:
2023-02-21
Contact:
*E-mail: haiqiangwang@zju.edu.cn (H. Wang), zbwu@zju.edu.cn (Z. Wu)
Supported by:
Qian Li, Qijun Tang, Peiyao Xiong, Dongzhi Chen, Jianmeng Chen, Zhongbiao Wu, Haiqiang Wang. Effect of palladium chemical states on CO2 photocatalytic reduction over g-C3N4: Distinct role of single-atomic state in boosting CH4 production[J]. Chinese Journal of Catalysis, 2023, 46: 177-190.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(22)64199-8
Fig. 1. TEM and HRTEM images of CN (a), PdOx/CN (b), Pd/CN-NP (c), Pd/CN-SA (d). (e) HAADF-STEM image of Pd/CN-SA. (f) FT-EXAFS spectra of Pd/CN-SA, bulk palladium foil, and PdO at the Pd K-edge.
Fig. 3. 8-h Cumulative productions of CO and CH4 over Pd/CN (x h) (a), CN, Pd/CN-SA, Pd/CN-NP, PdOx/CN (b). (c) CO and CH4 selectivity of as-prepared samples. (d) Cycling tests of Pd/CN-SA under visible-light irradiation.
Fig. 4. (a) UV-vis diffuse reflectance spectra. (b) EPR spectra in the presence of TEMPO under visible-light irradiation. PL spectra (c), time-resolved PL spectra (d), photocurrent responses (e) and EIS spectra (f) for CN, Pd/CN-SA, Pd/CN-NP, and PdOx/CN.
Fig. 8. (a) H2 uptake tests. CO (b) and CH4 (c) production in CO2 photocatalytic reduction performance tests using H2 instead of H2O as the reductant. (d) Detained adsorption and dissociation process of H2O IS, TS and FS on the surface of Pd/CN-SA (d-1), Pd/CN-NP (d-2) and PdOx/CN (d-3). (e) Reaction coordinate for H2O adsorption and dissociation.
Fig. 10. In-situ DRIFT spectra for CN (a,e), Pd/CN-SA (b,f), PdOx/CN (c,g) and Pd/CN-NP (d,h) before and after visible-light irradiation for 2 h when exposed to CO2+H2O (a?d) and CO+H2O (e?h).
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