Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (5): 1238-1246.DOI: 10.1016/S1872-2067(21)63946-3
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Zixun Yu, Chang Liu, Yeyu Deng, Mohan Li, Fangxin She, Leo Lai, Yuan Chen(), Li Wei(
)
Received:
2021-08-29
Accepted:
2021-09-14
Online:
2022-05-18
Published:
2022-03-23
Contact:
Yuan Chen, Li Wei
Supported by:
Zixun Yu, Chang Liu, Yeyu Deng, Mohan Li, Fangxin She, Leo Lai, Yuan Chen, Li Wei. Interfacial engineering of heterogeneous molecular electrocatalysts using ionic liquids towards efficient hydrogen peroxide production[J]. Chinese Journal of Catalysis, 2022, 43(5): 1238-1246.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(21)63946-3
Fig. 1. Catalyst synthesis and characterization. (a) Schematic illustration of the synthesis of IL coated CoPc/CNT catalysts; (b) HAADF-STEM image of the CoPc/CNT catalyst; BF-STEM (c), STEM-EDX mapping result (d), and HAADF-STEM image (e) of the IL coated CoPc/CNT-1 catalyst; XPS survey scans (f), and N 1s (g) and Co 2p (h) high-resolution XPS spectra of different catalysts.
Fig. 2. Electrochemical performance of CoPc/CNT catalysts. LSV curves of the CoPc/CNT and CoPc/CNT-x catalysts collected in O2 saturated electrolyte (a), and the calculated H2O2 selectivity (λH2O2) and electron transfer number (n) (b); (c) The mass kinetic current density (jK-mass) of different catalysts toward H2O2 production. Inset shows the jK-mass at 0.2 V vs. RHE.
Catalyst | Udisk/ V | Uring/ V | n | H2O2 (%) | FEH2O2 (%) | jK/ mA cm-2 |
---|---|---|---|---|---|---|
CoPc/CNT | 0.55 | 0.54 | 2.39 | 80 | 67 | 16.45 |
CoPc/CNT-0.2 | 0.59 | 0.58 | 2.33 | 83 | 71 | 18.46 |
CoPc/CNT-1 | 0.64 | 0.62 | 2.15 | 92 | 86 | 22.51 |
CoPc/CNT-1.5 | 0.66 | 0.64 | 2.18 | 91 | 84 | 31.41 |
CoPc/CNT-2 | 0.65 | 0.62 | 2.30 | 85 | 74 | 22.18 |
Table 1 ORR performance of CoPc/CNT catalysts. Performance parameters were collected at 0.2 V.
Catalyst | Udisk/ V | Uring/ V | n | H2O2 (%) | FEH2O2 (%) | jK/ mA cm-2 |
---|---|---|---|---|---|---|
CoPc/CNT | 0.55 | 0.54 | 2.39 | 80 | 67 | 16.45 |
CoPc/CNT-0.2 | 0.59 | 0.58 | 2.33 | 83 | 71 | 18.46 |
CoPc/CNT-1 | 0.64 | 0.62 | 2.15 | 92 | 86 | 22.51 |
CoPc/CNT-1.5 | 0.66 | 0.64 | 2.18 | 91 | 84 | 31.41 |
CoPc/CNT-2 | 0.65 | 0.62 | 2.30 | 85 | 74 | 22.18 |
Fig. 3. (a) Relationship between the half-wave potential increment (ΔE1/2) and the H2O2 selectivity differences to the x value in CoPc/CNT-x catalysts; (b) O2 solubility measurement.
Fig. 4. H2O2 production performance of two-electrode electrolyzers assembled using CoPc/CNT-1.5 and CoPc/CNT. Electrolyzer voltage responses (a), and H2O2 selectivity (b) at different current densities; (c) Chronopotentiometry test results and the amount of H2O2 produced.
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