Solvent Engineering of Oxygen-Enriched Carbon Dots for Efficient Electrochemical Hydrogen Peroxide Production.
Xiaoyu ShenZeming WangHuazhang GuoZhendong LeiZheng LiuLiang WangPublished in: Small (Weinheim an der Bergstrasse, Germany) (2023)
The development of cost-effective and reliable metal-free carbon-based electrocatalysts has gained significant attention for electrochemical hydrogen peroxide (H 2 O 2 ) generation through a two-electron oxygen reduction reaction. In this study, a scalable solvent engineering strategy is employed to fabricate oxygen-doped carbon dots (O-CDs) that exhibit excellent performance as electrocatalysts. By adjusting the ratio of ethanol and acetone solvents during the synthesis, the surface electronic structure of the resulting O-CDs can be systematically tuned. The amount of edge active CO group was strongly correlated with the selectivity and activity of the O-CDs. The optimum O-CDs-3 exhibited extraordinary H 2 O 2 selectivity of up to 96.55% (n = 2.06) at 0.65 V (vs RHE) and achieved a remarkably low Tafel plot of 64.8 mV dec -1 . Furthermore, the realistic H 2 O 2 productivity yield of flow cell is measured to be as high as 111.18 mg h -1 cm -2 for a duration of 10 h. The findings highlight the potential of universal solvent engineering approach for enabling the development of carbon-based electrocatalytic materials with improved performance. Further studies will be undertaken to explore the practical implications of the findings for advancing the field of carbon-based electrocatalysis.
Keyphrases
- hydrogen peroxide
- quantum dots
- ionic liquid
- nitric oxide
- visible light
- gold nanoparticles
- solar cells
- working memory
- single cell
- molecularly imprinted
- climate change
- cell therapy
- mass spectrometry
- mesenchymal stem cells
- metal organic framework
- human health
- case control
- structural basis
- high resolution
- solid phase extraction