Chinese Journal of Catalysis ›› 2024, Vol. 62: 231-242.DOI: 10.1016/S1872-2067(24)60059-8
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Qing Liua,1, Xue-Feng Chenga,1, Jin-Yan Huoa, Xiao-Fang Liua, Huilong Dongb,*(), Hongbo Zengc, Qing-Feng Xua,*(
), Jian-Mei Lua,*(
)
Received:
2024-03-31
Accepted:
2024-05-23
Online:
2024-07-18
Published:
2024-07-10
Contact:
E-mail: About author:
1 Contributed to this work equally.
Supported by:
Qing Liu, Xue-Feng Cheng, Jin-Yan Huo, Xiao-Fang Liu, Huilong Dong, Hongbo Zeng, Qing-Feng Xu, Jian-Mei Lu. Manipulating the interactions between N-intermediates and one-dimensional conjugated coordination polymers to boost electroreduction of nitrate to ammonia[J]. Chinese Journal of Catalysis, 2024, 62: 231-242.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(24)60059-8
Fig. 1. (a) Schematic diagram of the synthesis of M-BTA. SEM image (b) and TEM image (c) of Cu-BTA electrocatalyst. (d) HAADF-STEM image of Cu-BTA and corresponding EDX element mapping images of Cu, C and N elements. XPS survey spectrum (e), FT-IR spectra (f) and XRD patterns (g) of Fe-BTA, Co-BTA, Ni-BTA and Cu-BTA.
Fig. 2. NITRR activity of the Cu-BTA electrocatalyst. (a) LSV curves of the Cu-BTA tested in 0.5 mol L-1 Na2SO4 with and without 100 mg?L?1 NO3--N. Compare faradaic efficiency for ammonia (FENH3), selectivity for ammonia (SNH3), selectivity of nitrite (SNO2-) and NH3 yield rate at different applied potentials (b) and different electrocatalysts (c). (d) Comparison of conversion for nitrate and NH3 yield rate of Cu-BTA with the previously reported catalysts (Table S3). (e) Time-dependent concentration change of NO3--N, NO2--N and NH3-N tested at ?1.2 V (vs. RHE) with 100 mg L-1 initial nitrate. (f) Consecutive 25 times cycles reduction tests at ?1.2 V vs. RHE on Cu-BTA. Potential-dependent in-situ IR (g) and in situ Raman (h) spectra of Cu-BTA.
Fig. 3. Conversion of N-NO3-, NH3 yield rate, selectivity of ammonia and nitrite. Comparison of Cu-BTA electrocatalyst with different initial N-NO3- concentrations (a), at different temperatures (b) and in different pH electrolytes (c). The effect of electrocatalytic reduction of nitrate with different concentrations of Cl-. The plots of concentration of N-NO3- (d), N-NO2- (e) and N-NH3 (f) with time. (g) TN removal rate with different concentrations of Cl-. The XRD patterns of the recovered NH4Cl(s) product (h) and synthesized MgNH4PO4·6H2O (i).
Fig. 4. (a) LSV curves of different catalysts in 0.5 mol L?1 Na2SO4 with 100 mg mL-1 NO3?-N. (b) EIS Nyquist plots of different catalysts. (c) Plots of the current density differences (Δj/2) versus a function of the scan rates at various scan rates (5-100 mV s?1) for different catalysts. (d) Tafel plots of different catalysts in 0.5 mol L?1 Na2SO4.
Fig. 5. Reaction pathway for nitrate on the surface of Cu-BTA (a), Ni-BTA, Co-BTA and Fe-BTA (b). Adsorption energies diagram of NITRR involved species (c) and free energy evolution for H2 formation on the surface of M-BTA (M: Fe, Co, Ni, Cu) (d).
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