Chinese Journal of Catalysis ›› 2024, Vol. 66: 212-222.DOI: 10.1016/S1872-2067(24)60121-X
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Mengran Liua,1, Canyu Liua,1, Tianfang Yangb, Shixiang Hua, Siyun Lia, Shizhe Liub, Yang Liua, Ye Chena, Bingcheng Gea,*(), Shuyan Gaoa,b,*(
)
Received:
2024-07-01
Accepted:
2024-08-22
Online:
2024-11-18
Published:
2024-11-10
Contact:
*E-mail: About author:
1Contributed equally to this work.
Supported by:
Mengran Liu, Canyu Liu, Tianfang Yang, Shixiang Hu, Siyun Li, Shizhe Liu, Yang Liu, Ye Chen, Bingcheng Ge, Shuyan Gao. High-efficiency electrochemical H2O2 synthesis by heteroatom-doped NiX/Ni nanocomposites with honeycomb-like porous carbon[J]. Chinese Journal of Catalysis, 2024, 66: 212-222.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(24)60121-X
Scheme 1. Schematic illustration for the synthesis of the NiO/Ni@NCHS-700 composite catalyst with a honeycomb structure (a) and the NCSS-700 catalyst with a solid structure (b).
Fig. 1. Compositions and morphologies of NiO/Ni@NCHS-700. (a,b) FESEM images; (c,d) TEM images; (e,f) HR-TEM images; (g) HAADF images, and corresponding EDS maps.
Fig. 2. N2 adsorption-desorption isotherms (a), pore size distributions by the DFT method (b), BET specific area and total pore volume information (c), XRD patterns (d), Raman spectra (e), and FT-IR spectra (f) of NiO/Ni@NCHS-700 and counterparts.
Fig. 3. (a) Full spectrum of NCHS-700, NCSS-700, NiO/Ni@NCHS-700, and NiO/Ni@NCSS-700. High-resolution XPS spectra of C 1s (b). (c) Element contents of different samples. N 1s (d), O 1s (e) and Ni 2p (f) spectra of catalysts XPS.
Fig. 4. LSV curves (a), limiting disk current density (jL) and onset potential (Eon) (b), H2O2 selectivity and electron transfer number (n) (c) of NCHS-700, NCSS-700, NiO/Ni@NCHS-700, and NiO/Ni@NCSS-700. (d) Performance comparison of electrochemical H2O2 production on NiO/Ni@NCHS-700 and other reported catalysts based on RRDE performance map of Eon and maximum H2O2 selectivity. (e) Tafel plots of NiO/Ni@NCHS-700. (f) The calculated H2O2 productivity and Faradaic efficiency of NiO/Ni@NCHS-700 at 0.2, 0.3, 0.4, 0.5, and 0.6 V vs. RHE, respectively (Error bars from three measurements at different potentials). (g) Stability measurement of NiO/Ni@NCHS-700. (h) Performance comparison of electrochemical H2O2 production on NiO/Ni@NCHS-700 and other recently reported catalysts performance map of jL and durability.
Fig. 5. (a) The ATR-FIIR spectra of NiO/Ni@NCHS for the 2e- ORR in the potentiostatic step. (b) In situ Raman spectra of NiO/Ni@NCHS. (c,d) Free energy diagram of the Ni@NCHS, NiO@NCHS, NiS6@NCHS, NiO/Ni@NCHS, and NiS6/Ni@NCHS. (e) PDOS for the d-orbitals. (f,g) Charge density differences of NiO/Ni@NCHS and NiS6/Ni@NCHS, where the electron accumulation and depletion regions are shown in yellow and green, respectively. (h) Volcano plot for 2e- ORR activity with the *OOH descriptor. (i) Schematic diagrams of NiO/Ni@NCHS reaction processes.
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