Chinese Journal of Catalysis ›› 2023, Vol. 45: 152-161.DOI: 10.1016/S1872-2067(22)64188-3
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Ping Zhanga, Hao Chena,*(), Lin Chena, Ying Xionga, Ziqi Sunb, Haoyu Yangb, Yingke Fua, Yaping Zhanga, Ting Liaoc,*(
), Fei Lid,*(
)
Received:
2022-07-14
Accepted:
2022-10-19
Online:
2023-02-18
Published:
2023-01-10
Contact:
Hao Chen, Ting Liao, Fei Li
Supported by:
Ping Zhang, Hao Chen, Lin Chen, Ying Xiong, Ziqi Sun, Haoyu Yang, Yingke Fu, Yaping Zhang, Ting Liao, Fei Li. Atomically dispersed Ni-N-C catalyst derived from NiZn layered double hydroxides for efficient electrochemical CO2 reduction[J]. Chinese Journal of Catalysis, 2023, 45: 152-161.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(22)64188-3
Fig. 2. TEM images (a-c) and HR-TEM image (d) of Ni-N-C-1. (e) HAADF-TEM image and corresponding EDS element mapping of Ni-N-C-1. AFM image (f) and the height profile (i) of Ni-N-C-1. (g) BET surface area and (inset) pore-size distribution curve of Ni-N-C-1. (h) Aberration-corrected HAADF-STEM image of Ni-N-C-1.
Fig. 3. (a) Ni K-edge XANES spectra of Ni-N-C-1, Ni foil, NiO and NiPc shown in k2-weighted R space. The wavelet transform of Ni-N-C-1 (b). NiPc (d), and NiO (f). (c) Fourier transformation of EXAFS spectra Ni-N-C-1, Ni foil, and NiO. (e) Ni K-edge EXAFS fitting result of Ni-N-C-1 shown in k2-weighted R space and Ni-N4 coordination environment.
Fig. 4. (a) LSV in CO2-saturated. (b) FECO at different potentials. (c) CO current density. (d) Tafel plots. (e) Nyquist plots. (f) Charging current density differences plotted against scan rates of CN, Ni-N-C-1NPs, and Ni-N-C-1. FECO (g) and current densities (h) of CO of Ni-N-C-0.5, Ni-N-C-1, and Ni-N-C-2 at different potentials. (i) Durability of Ni-N-C-1 at ?0.8 V (vs. RHE).
Fig. 5. (a) Free-energy diagram of CO2RR reaction on Ni-N co-doped graphite and the schematic of the reaction steps of the electrocatalytic CO2 to CO reaction. (b) The charge density difference of NiN4 configurations. The isosurface is selected at 0.0025 e ?-3 and the yellow and cyan regions represent electron accumulation and depletion, respectively.
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