Chinese Journal of Catalysis ›› 2026, Vol. 81: 227-245.DOI: 10.1016/S1872-2067(25)64866-2
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Yongsheng Hua, Shiji Dua,c, Jihui Langa,b, Huilian Liua,b, Xuefei Lia,b, Qi Zhanga,b, Ming Lua,c, Xin Lia,b,c(
), Binrong Lid(
), Maobin Weia,b(
), Lili Yanga,b(
)
Received:2025-07-20
Accepted:2025-09-18
Online:2026-02-18
Published:2025-12-26
Contact:
*E-mail: xlwl@jlnu.edu.cn (X. Li),libr@usts.edu.cn (B. Li),jlsdzccw@126.com (M. Wei),llyang1980@126.com (L. Yang).
Supported by:Yongsheng Hu, Shiji Du, Jihui Lang, Huilian Liu, Xuefei Li, Qi Zhang, Ming Lu, Xin Li, Binrong Li, Maobin Wei, Lili Yang. Rational construction of MXene-derived TiO2/CoNiO2 dual-site S-scheme heterojunction for boosting C-C coupling toward efficient photocatalytic CO2-to-C2H4 conversion[J]. Chinese Journal of Catalysis, 2026, 81: 227-245.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(25)64866-2
Fig. 1. (a) XRD images of MT, MTC-2 and CNO. (b) Survey XPS spectra of MT CNO and MTC-2. XPS spectra of MT, CNO and MTC-2 of Co 2p (c), Ni 2p (d). XPS spectra of MT and MTC-2 of O 1s (e) and Ti 2p (f).
Fig. 2. (a) Normalized Co K-edge XANES spectra. (b) Normalized Ni K-edge XANES spectra. (c) FT-EXAFS spectra of Co K-edge and Ni K-edge. WT-EXAFS of Co K-edge for Co foil (d), MTC-2 (e), and Co3O4 references (f). WT-EXAFS of Ni K-edge for Ni foil (g), MTC-2 (h), and NiO references (i).
Fig. 3. SEM (a), TEM (b), HRTEM (c) images of MT and lattice spacing analysis of MT (c1). SEM (d), TEM (e), HRTEM (f) images of CNO and lattice spacing analysis of CNO (f1). SEM (g), TEM (h), HRTEM (i) images of MTC-2 and lattice spacing analysis of MTC-2 (i1-i2). (j1-j4) Elemental mapping images of (j) MTC-2.
Fig. 4. (a) CO, CH4, C2H4 and C2H6 yield with prepared samples. (b) Cyclic CO2 photoreduction results of C2H6. (c) Electron utilization efficiency. (d) C2H6 selectivity of the prepared sample. (e) Mass spectrometric analysis of the products from conventional CO2 reduction. (f) Product analysis of CO2 photoreduction using isotope-labeled 13CO2. (g) Comparison of C2H4 production performance with other reported CO2RR catalysts.
Fig. 5. In-situ FTIR of CNO (a) and MTC (b). (c) Gibbs free energy pathway of DFT calculation for CO2RR to *CO and *COH of MTC-2 and CNO. (d) Gibbs free energy pathway of DFT calculation for CO2RR to C2H4 of MTC-2 and CNO. (e) Reaction pathway and chemical structures of intermediates during CO2RR to *CO and *COH. (f) Reaction pathway and chemical structures of intermediates during CO2RR to C2H4.
Fig. 6. (a) UV-vis DRS spectra of CNO, MTC-2 and MT. (b) Transient photocurrent response curve. (c) Electrochemical impedance spectroscopy. (d) PL spectra. (e) TR-PL spectra and attenuation constant (τ). (f) TPV relaxation curves of CNO, MTC-2 and MT. (g) Attenuation constants (τ) of CNO, MTC-2 and MT. (h) Maximum charge extraction time (tmax) of CNO, MTC-2 and MT. (i) Charge extraction efficiency of CNO, MTC-2 and MT.
Fig. 7. In-situ XPS analysis of MTC-2 under reaction conditions: Co 2p (a), Ni 2p (b), Ti 2p (c), and O 1s (d). (e,f) Mechanism diagram of KPFM measurement. AFM images of CNO (g), MT (h) and MTC-2 (i). (j,k) VCPD of CNO and MT in dark along the marked line of (g,h). (l) VCPD of MTC-2 in the different light times along the marked line of (i).
Fig. 8. (a) TA spectra signals of CNO. (b) 2D mapping TA spectra of CNO. (c) TA spectra signals of MTC-2. (d) 2D mapping TA spectra of MTC-2. (e) Normalized decay kinetic curves of CNO. (f)Normalized decay kinetic curves of MTC-2. Schematics for the decay pathways of photogenerated electrons in CNO (g) and MTC-2 (h) composite.
Fig. 9. (a) UPS spectra of CNO and MT. (b) The band gaps of MT and CNO. Work function of MT (c) and CNO (d). (e)Three-dimensional charge density difference distribution (the yellow and cyan regions represent electron accumulation and depletion). (f) Plane-averaged charge density difference along the Z direction. (g) Schematic illustration of heterojunction formation dynamics and interfacial charge transfer mechanism.
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