Li, Z;
Cheng, H;
Lu, Y;
Wang, T;
Li, Y;
Zhang, W;
He, G;
(2023)
Potent Charge-Trapping for Boosted Electrocatalytic Oxygen Reduction.
Advanced Energy Materials
, Article 2203963. 10.1002/aenm.202203963.
(In press).
Preview |
Text
Potent Charge Trapping for Boosted Electrocatalytic Oxygen Reduction.pdf - Published Version Download (3MB) | Preview |
Abstract
Metal-free carbon-based materials are considered to be one of the most promising alternatives to precious metal Pt-based electrocatalysts. However, the electrocatalytic activity of heteroatom-modulated carbon rarely reaches the level of metal-based electrocatalysts. Here, electron-rich carbon and abundant pyridinic-N adjacent to C vacancies decorated with carbon nanosheets (E-NC-V) are synthesized and used as the host for boosting efficient oxygen reduction reaction. Rich pyridinic-N structures adjacent to C vacancies work in synergy with electron-rich carbon, which promotes the sharp decrease of |ΔGO*|, resulting in the balanced adsorption and dissociation of oxygen intermediates, and thus activating OO. This can be attributed to the abundant vacancies and d–p orbital hybridization between Zn and N/C. The E-NC-V catalyst drives the oxygen reduction reaction (ORR) via a 4e− transfer-dominated pathway with a half-wave potential of 0.87 V versus RHE in the alkaline solution, even superior to Pt/C. The assembled Al–air battery exhibits a high peak power density of 113 mW cm^{−2}. This promising strategy sheds light on the design and fabrication of robust, rich-density, and high-performance active sites for the ORR. The work is expected to inspire future work on the role of electronic structure modulation and defect engineering for enhanced reaction kinetics.
| Type: | Article |
|---|---|
| Title: | Potent Charge-Trapping for Boosted Electrocatalytic Oxygen Reduction |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/aenm.202203963 |
| Publisher version: | https://doi.org/10.1002/aenm.202203963 |
| Language: | English |
| Additional information: | © 2021 The Authors. Advanced Energy Materials published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/). |
| Keywords: | d–p orbital hybridization, electron-enriched carbon, metal–air batteries, N regulation, oxygen reduction reaction |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10167775 |
Loading...
Loading...Loading...Loading...Archive Staff Only
 |
View Item |
