AI Article Synopsis
- The study explores a new electrocatalyst, nitrogen and oxygen comodified carbon nanotubes (N,O-CNTs), for improving the efficiency of the 2-electron oxygen reduction reaction (ORR), which is essential for producing hydrogen peroxide (H₂O₂) in renewable energy applications.
- N,O-CNTs demonstrate over 95% selectivity for H₂O₂ across a wide voltage range (0 to 0.65 V), outperforming traditional carbon nanotubes (CNTs) and oxygen-rich CNTs, which have lower selectivity.
- The research indicates that the enhanced performance is due to specific interactions at the molecular level, where nitrogen and oxygen doping optimize the adsorption energies of reaction intermedi
Article Abstract
Electrochemical 2-electron oxygen reduction reaction (ORR) is a promising route for renewable and on-site H O production. Oxygen-rich carbon nanotubes have been demonstrated their high selectivity (≈80%), yet tailoring the composition and structure of carbon nanotubes to further enhance the selectivity and widen working voltage range remains a challenge. Herein, combining formamide condensation coating and mild temperature calcination, a nitrogen and oxygen comodified carbon nanotubes (N,O-CNTs) electrocatalyst is synthesized, which shows excellent selective (>95%) H O selectivity in a wide voltage range (from 0 to 0.65 V versus reversible hydrogen electrode). It is significantly superior to the corresponding selectivity values of CNTs (≈50% in 0-0.65 V vs RHE) and O-CNTs (≈80% in 0.3-0.65 V vs RHE). Density functional theory calculations revealed that the C neighbouring to N is the active site. Introducing O-related species can strengthen the adsorption of intermediates *OOH, while N-doping can weaken the adsorption of in situ generated *O and optimize the *OOH adsorption energy, thus improving the 2-electron pathway. With optimized N,O-CNTs catalysts, a Janus electrode is designed by adjusting the asymmetric wettability to achieve H O productivity of 264.8 mol kg h .
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9507382 | PMC |
| http://dx.doi.org/10.1002/advs.202201421 | DOI Listing |
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