Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (5): 1341-1350.DOI: 10.1016/S1872-2067(21)63944-X
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Hui Maoa, Haoran Yanga, Jinchi Liua, Shuai Zhanga, Daliang Liua, Qiong Wua, Wenping Sunc, Xi-Ming Songa(), Tianyi Mab(
)
Received:
2021-08-13
Accepted:
2021-09-13
Online:
2022-05-18
Published:
2022-03-23
Contact:
Xi-Ming Song, Tianyi Ma
Supported by:
Hui Mao, Haoran Yang, Jinchi Liu, Shuai Zhang, Daliang Liu, Qiong Wu, Wenping Sun, Xi-Ming Song, Tianyi Ma. Improved nitrogen reduction electroactivity by unique MoS2-SnS2 heterogeneous nanoplates supported on poly(zwitterionic liquids) functionalized polypyrrole/graphene oxide[J]. Chinese Journal of Catalysis, 2022, 43(5): 1341-1350.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(21)63944-X
Fig. 1. XRD patterns (a), EDS spectra (b), survey (c), Mo 3d (d), Sn 3d (e), and S 2p (f) XPS spectra of MoS2/PVIPS/PPy/GO (1), SnS2/PVIPS/PPy/GO (2), and MoS2-SnS2/PVIPS/PPy/GO (3).
Fig. 2. SEM (a), TEM (b), HRTEM (c), the SAED pattern (d) and high-angle annular dark field image (e) of MoS2-SnS2/PVIPS/PPy/GO, with the corresponding elemental mapping of C, N, O, Mo, Sn, S.
Fig. 3. The NH3 yield and FE of MoS2/PVIPS/PPy/GO (a), SnS2/PVIPS/PPy/GO (b), MoS2-SnS2/PVIPS/PPy/GO (c) for NRR under electrolysis for 2 h in 0.1 mol/L Na2SO4 at different potentials (vs. RHE); (d) The NH3 yield and FE obtained by different electrocatalysts at ?0.5 V (vs. RHE) under electrolysis for 2 h in 0.1 mol/L Na2SO4: (1) MoS2-SnS2, (2) MoS2-SnS2/GO, (3) MoS2-SnS2/PPy/GO, (4) MoS2/PVIPS/PPy/GO, (5) SnS2/PVIPS/PPy/GO and (6) MoS2-SnS2/PVIPS/PPy/GO.
Electrocatalyst | Mo content by ICP (wt%) | Sn content by ICP (wt%) | MoS2+SnS2 loading (wt%) |
---|---|---|---|
MoS2-SnS2 | — | — | 100.00 |
MoS2-SnS2/GO | 7.97 | 13.22 | 33.63 |
MoS2-SnS2/PPy/GO | 5.75 | 5.21 | 17.59 |
MoS2/PVIPS/PPy/GO | 17.46 | 0 | 29.10 |
SnS2/PVIPS/PPy/GO | 0 | 7.51 | 11.56 |
MoS2-SnS2/PVIPS/PPy/GO | 5.16 | 6.03 | 17.88 |
Table 1 Different electrocatalysts synthesized by different supporters with their Mo and Sn content determined by ICP and calculated MoS2+SnS2 loading content.
Electrocatalyst | Mo content by ICP (wt%) | Sn content by ICP (wt%) | MoS2+SnS2 loading (wt%) |
---|---|---|---|
MoS2-SnS2 | — | — | 100.00 |
MoS2-SnS2/GO | 7.97 | 13.22 | 33.63 |
MoS2-SnS2/PPy/GO | 5.75 | 5.21 | 17.59 |
MoS2/PVIPS/PPy/GO | 17.46 | 0 | 29.10 |
SnS2/PVIPS/PPy/GO | 0 | 7.51 | 11.56 |
MoS2-SnS2/PVIPS/PPy/GO | 5.16 | 6.03 | 17.88 |
Fig. 4. (a) Linear sweep voltammograms of MoS2-SnS2/PVIPS/PPy/GO under saturated Ar and N2 in 0.1 mol/L Na2SO4; (b) The NH3 yield and FE of MoS2-SnS2/PVIPS/PPy/GO with alternating 2 h cycles at ?0.5 V between Ar and N2 atmosphere; (c) Recycling test for MoS2-SnS2/PVIPS/PPy/GO at ?0.5 V under electrolysis for 2 h performed six times; (d) XRD patterns of MoS2-SnS2/PVIPS/PPy/GO before (1) and after (2) NRR for 30 h.
Fig. 5. SEM (a), TEM (b), HRTEM (c), the SAED pattern (d) and high-angle annular dark field image (e) of MoS2-SnS2/PVIPS/PPy/GO after NRR for 30 h, with the corresponding elemental mapping of C, N, O, Mo, Sn, S.
Fig. 6. XPS spectra of MoS2-SnS2/PVIPS/PPy/GO before (1) and after (2) electrocatalysis, performed by chronoamperometry for 30 h under saturated N2 in 0.1 mol/L Na2SO4. (a) C 1s; (b) O 1s; (c) N 1s; (d) Mo 3d; (e) Sn 3d; (f) S 2p.
Scheme 1. The irreversible crystal phase transition of MoS2-SnS2 heterogeneous nanoplates with the corresponding electrode reactions on MoS2-SnS2/PVIPS/PPy/GO in 0.1 mol/L Na2SO4 solution containing saturated N2.
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