Honeycomb Carbon Nanofibers: A Superhydrophilic O2‐Entrapping Electrocatalyst Enables Ultrahigh Mass Activity for the Two‐Electron Oxygen Reduction Reaction
- 25 February 2021
- journal article
- research article
- Published by Wiley in Angewandte Chemie
- Vol. 60 (19), 10583-10587
- https://doi.org/10.1002/anie.202101880
Abstract
Electrocatalytic two‐electron oxygen reduction has emerged as a promising alternative to the energy‐ and waste‐intensive anthraquinone process for distributed H 2 O 2 production. This process, however, suffers from strong competition from the four‐electron pathway leading to low H 2 O 2 selectivity. Herein, we report using a superhydrophilic O 2 ‐entrapping electrocatalyst to enable superb two‐electron oxygen reduction electrocatalysis. The honeycomb carbon nanofibers (HCNFs) are robust and capable of achieving a high H 2 O 2 selectivity of 97.3%, much higher than that of its solid carbon nanofiber counterpart. Impressively, this catalyst achieves an ultrahigh mass activity of up to 220 A g −1 , surpassing all other catalysts for two‐electron oxygen reduction reaction. The superhydrophilic porous carbon skeleton with rich oxygenated functional groups facilitates efficient electron transfer and better wetting of the catalyst by the electrolyte, and the interconnected cavities allow for more effective entrapping of the gas bubbles. The catalytic mechanism is further revealed by in situ Raman analysis and density functional theory calculations.Keywords
This publication has 39 references indexed in Scilit:
- Electrocatalytic hydrogen peroxide production in acidic media enabled by NiS2 nanosheetsJournal of Materials Chemistry A, 2021
- Noble-metal-free electrocatalysts toward H2O2productionJournal of Materials Chemistry A, 2020
- Partially Pyrolyzed Binary Metal–Organic Framework Nanosheets for Efficient Electrochemical Hydrogen Peroxide SynthesisAngewandte Chemie, 2020
- Partially Pyrolyzed Binary Metal–Organic Framework Nanosheets for Efficient Electrochemical Hydrogen Peroxide SynthesisAngewandte Chemie, 2020
- Advances in the slurry reactor technology of the anthraquinone process for H2O2 productionFrontiers of Chemical Science and Engineering, 2017
- A review on research progress in the direct synthesis of hydrogen peroxide from hydrogen and oxygen: noble-metal catalytic method, fuel-cell method and plasma methodCatalysis Science & Technology, 2015
- High and robust performance of H2O2 fuel cells in the presence of scandium ionEnergy & Environmental Science, 2015
- Enabling direct H2O2 production through rational electrocatalyst designNature Materials, 2013
- Hydrogen Peroxide Synthesis: An Outlook beyond the Anthraquinone ProcessAngewandte Chemie, 2006
- Wasserstoffperoxid‐Synthese: Perspektiven jenseits des Anthrachinon‐VerfahrensAngewandte Chemie, 2006