B-N-, Si-N, and S-N-co-doped carbon quantum dots (CQD) were prepared by hydrothermal synthesis from inexpensive and non-toxic precursors. They were analysed by Raman, FTIR, and XPS spectroscopies and used as oxygen reduction reaction (ORR) electrocatalysts. The electrodes were prepared by drop-casting a slurry con-taining poly(sulfone trimethylammonium) hydroxide (PSU-TMA) to enhance the hydroxide-ion transport near the catalytically active centers. Furthermore, polyaniline (PANI), reported to be catalytically active for the ORR, was added to some electrodes. A similar trend was observed for the electrode capacitance measured by cyclo-voltammetry in the non-Faradaic region and impedance spectroscopy. The ORR kinetics studied by linear sweep voltammetry showed the lowest onset and half-wave potentials and the lowest Tafel slopes for the B-N-co-doped samples, although the B concentration is low (0.5%). Data with and without PANI are quite similar. The S -N-and Si-N co-doped samples are slightly less efficient. The stability test demonstrated a decrease by about 10% of the diffusion-limited current after 500 cycles, indicating a microstructural change impacting the mass transport conditions, but the onset potential is not modified. Altogether, the good electrocatalytic activity of B-N-co-doped CQD with a low boron concentration in presence of PSU-TMA indicated the high potential of these electrodes. The inexpensive synthesis of co-doped CQD from non-toxic precursors is an important advantage of these ma-terials vs other carbon-doped electrocatalysts.

Nallayagari, A., Sgreccia, E., Pasquini, L., Vacandio, F., Kaciulis, S., Di Vona, M., et al. (2022). Catalytic electrodes for the oxygen reduction reaction based on co-doped (B-N, Si-N, S-N) carbon quantum dots and anion exchange ionomer. ELECTROCHIMICA ACTA, 427 [10.1016/j.electacta.2022.140861].

Catalytic electrodes for the oxygen reduction reaction based on co-doped (B-N, Si-N, S-N) carbon quantum dots and anion exchange ionomer

Sgreccia, E
Investigation
;
Di Vona, ML
Supervision
;
2022-01-01

Abstract

B-N-, Si-N, and S-N-co-doped carbon quantum dots (CQD) were prepared by hydrothermal synthesis from inexpensive and non-toxic precursors. They were analysed by Raman, FTIR, and XPS spectroscopies and used as oxygen reduction reaction (ORR) electrocatalysts. The electrodes were prepared by drop-casting a slurry con-taining poly(sulfone trimethylammonium) hydroxide (PSU-TMA) to enhance the hydroxide-ion transport near the catalytically active centers. Furthermore, polyaniline (PANI), reported to be catalytically active for the ORR, was added to some electrodes. A similar trend was observed for the electrode capacitance measured by cyclo-voltammetry in the non-Faradaic region and impedance spectroscopy. The ORR kinetics studied by linear sweep voltammetry showed the lowest onset and half-wave potentials and the lowest Tafel slopes for the B-N-co-doped samples, although the B concentration is low (0.5%). Data with and without PANI are quite similar. The S -N-and Si-N co-doped samples are slightly less efficient. The stability test demonstrated a decrease by about 10% of the diffusion-limited current after 500 cycles, indicating a microstructural change impacting the mass transport conditions, but the onset potential is not modified. Altogether, the good electrocatalytic activity of B-N-co-doped CQD with a low boron concentration in presence of PSU-TMA indicated the high potential of these electrodes. The inexpensive synthesis of co-doped CQD from non-toxic precursors is an important advantage of these ma-terials vs other carbon-doped electrocatalysts.
2022
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore CHIM/07 - FONDAMENTI CHIMICI DELLE TECNOLOGIE
English
Oxygen reduction
Carbon materials
Electrocatalyst
Fuel cells
Stability
Nallayagari, A., Sgreccia, E., Pasquini, L., Vacandio, F., Kaciulis, S., Di Vona, M., et al. (2022). Catalytic electrodes for the oxygen reduction reaction based on co-doped (B-N, Si-N, S-N) carbon quantum dots and anion exchange ionomer. ELECTROCHIMICA ACTA, 427 [10.1016/j.electacta.2022.140861].
Nallayagari, A; Sgreccia, E; Pasquini, L; Vacandio, F; Kaciulis, S; Di Vona, M; Knauth, P
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/313918
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