Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (11): 1983-1991.DOI: 10.1016/S1872-2067(21)63834-2
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Mengyang Lia,c,†, Cuibo Liua,†, Yi Huanga, Shuyan Hana, Bing Zhanga,b,*()
Received:
2021-02-26
Revised:
2021-02-26
Accepted:
2021-05-04
Online:
2021-11-18
Published:
2021-05-18
Contact:
Bing Zhang
About author:
*Tel: +86-22-27406140; Fax: +86-22-27403475; E-mail: bzhang@tju.edu.cnSupported by:
Mengyang Li, Cuibo Liu, Yi Huang, Shuyan Han, Bing Zhang. Water-involving transfer hydrogenation and dehydrogenation of N-heterocycles over a bifunctional MoNi4 electrode[J]. Chinese Journal of Catalysis, 2021, 42(11): 1983-1991.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(21)63834-2
Fig. 1. (a) Reported homogeneous and heterogeneous catalytic hydrogenation of N-heteroarenes. (b) Electrocatalytic transfer hydrogenation/deuteration using H2O or D2O and reverse dehydrogenation of N-heterocycles over a bifunctional MoNi4 electrode.
Fig. 2. (a) SEM image of MoNi4 nanosheet arrays. TEM (b,c) and HRTEM (d) images of MoNi4 nanosheets; (e-g) Elemental mapping of MoNi4 nanosheets; (h) XRD patterns of powder scratched from the MoNi4 electrode; (i,j) Ni 2p and Mo 3d XPS profiles for MoNi4 nanosheets.
Fig. 3. (a) LSV curves of MoNi4 cathode at a scan rate of 1 mV s-1 in 10 mL of 1.0 M KOH with and without 10 mM of 1a. (b) Potential-dependent FEs and selectivity of 2a. Conditions: 1a (0.1 mmol), MoNi4 electrode (working area: 1.0 cm2), 1.0 M KOH (7.0 mL), 38.5 C charge transferred, room temperature. (c) Comparison with other electrodes. Conditions: 1a (0.1 mmol), electrode (working area: 1.0 cm2), 1.0 M KOH (7.0 mL), -0.5 V vs. RHE, 38.5 C charge transferred. (d) Time-dependent evolution of 1a, fully and half-hydrogenated products 2a and DHQ. 48 C transferred for the full conversion of 0.1 mmol of 1a. (e) J-t curve of MoNi4 at -0.05 V vs. RHE with intermittent addition of 0.1 mmol of 1a. (f) Cycle-dependent yields and FEs of 2a. 48 C transferred for each cycle. Conv. = Conversion. Sel. = Selectivity.
Fig. 4. (a) LSV curves of glassy carbon cathode at a scan rate of 5 mV s-1 in 10 mL of 1.0 M KOH with and without 10 mM of 1a; (b) Spin trapping of hydrogen radical; (c) Transformations of 1a with and without the addition of t-BuOH; (d) HPLC chromatograms acquired at various electrolysis times; (e) Proposed mechanism.
Fig. 5. Substrate scope of electrocatalytic transfer hydrogenation/deuteration of N-heteroarenes with H2O or D2O over MoNi4 cathode. a Reaction conditions: 1 (0.3 mmol), MoNi4 electrode (working area: 1.0 cm2), 1.0 M KOH (Diox/H2O, 1:6 v/v, 7 mL), room temperature, constant current = 25 mA, 6 h. b 10 h. c 1.0 M K2CO3 (Diox/D2O, 1:6 v/v, 7 mL). Conversion yields of 1 are reported. Numbers in parentheses are the selectivity of 2.
Fig. 6. (a) LSV curves of MoNi4 anode at a scan rate of 5 mV s-1 in 10 mL of 1.0 M KOH with and without 10 mM of 2a; (b) Potential-dependent in situ Raman tests; (c) Time-dependent in situ Raman tests at 1.45 V vs. RHE in 1.0 M KOH solution in the presence of 10 mM of 2a; (d) Proposed process for dehydrogenation of 2a over MoNi4 anode; (e) LSV curves and comparison of potential for achieving benchmark current densities (10 and 20 mA cm-2) over MoNi4 || MoNi4 electrolyzer in 1.0 M KOH with and without 10 mM of 2a.
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