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Enhancing oxygen reduction activity of dinuclear copper complexes loaded on an N-doped carbon support a low-temperature pyrolysis strategy
Bioinspired by the active sites of multicopper oxidases (MCOs), bi/multinuclear copper complexes have attracted great attention in promoting catalytic activity for the oxygen reduction reaction (ORR). Herein, we report the preparation of a Cu-N-C electrocatalyst Cu-BPOZ@CNB-400 for efficient ORR, wh...
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| Published in: | Dalton transactions : an international journal of inorganic chemistry 2024-07, Vol.53 (27), p.11464-11469 |
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| Main Authors: | , , , , , , , |
| Format: | Article |
| Language: | |
| Online Access: | Get full text |
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| Summary: | Bioinspired by the active sites of multicopper oxidases (MCOs), bi/multinuclear copper complexes have attracted great attention in promoting catalytic activity for the oxygen reduction reaction (ORR). Herein, we report the preparation of a Cu-N-C electrocatalyst Cu-BPOZ@CNB-400 for efficient ORR, which was obtained by low temperature pyrolysis of a dinuclear 2,5-bis(2-pyridyl)-1,3,4-oxadiazole (BPOZ) copper complex loaded on a N-doped carbon support at 400 °C. Cu-BPOZ@CNB-400 exhibited a half-wave potential (
E
1/2
) of 0.86 V
vs.
RHE for the ORR in 0.1 M KOH solution, which was significantly higher than that of the Cu-BPOZ@CNB-800 (
E
1/2
= 0.83 V) catalyst treated under high temperature (at 800 °C) and the control catalyst Cu-Phen@CNB-400 (
E
1/2
= 0.82 V) derived from low-temperature-treatment (at 400 °C) of a mononuclear phenanthroline-coordinated-Cu complex loaded on a N-doped carbon support. When Cu-BPOZ@CNB-400 was applied as the cathode catalyst in zinc-air batteries a maximum power density (
P
max
) of 127 mW cm
−2
could be achieved, demonstrating comparable catalyst performance to the commercial 20 wt% Pt/C (
P
max
= 122 mW cm
−2
) and the control Cu-Phen@CNB-400 catalyst (
P
max
= 105 mW cm
−2
) under similar experimental conditions. Low-temperature pyrolysis of dinuclear copper complexes on a carbon support improved the charge transfer efficiency, inhibited metal aggregation, and could produce highly dispersed Cu-N-C catalysts with dinuclear copper sites for promoting the 4e
−
-reduction selectivity of the ORR. It thus provides a cost-effective approach for the controllable fabrication of efficient ORR catalysts to be applied for energy conversion devices.
Low-temperature pyrolysis of a dinuclear copper complex loaded on a N-doped carbon support produced an atomically dispersed catalyst with dense active sites that exhibited remarkably enhanced performance for oxygen reduction reaction. |
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| ISSN: | 1477-9226 1477-9234 |
| DOI: | 10.1039/d4dt01044b |