Spectroscopic identification of active sites of oxygen-doped carbon for selective oxygen reduction to hydrogen peroxide
The electrochemical synthesis of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) via a two-electron (2 e<sup>−</sup>) oxygen reduction reaction (ORR) process provides a promising alternative to replace the energy-intensive anthraquinone process. Herein, we develop...
| Үндсэн зохиолчид: | , , , , , , , , , , , , , , , , , , , |
|---|---|
| Формат: | Journal article |
| Хэл сонгох: | English |
| Хэвлэсэн: |
Wiley
2023
|
| Тойм: | The electrochemical synthesis of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) via a two-electron (2 e<sup>−</sup>) oxygen reduction reaction (ORR) process provides a promising alternative to replace the energy-intensive anthraquinone process. Herein, we develop a facile template-protected strategy to synthesize a highly active quinone-rich porous carbon catalyst for H<sub>2</sub>O<sub>2</sub> electrochemical production. The optimized PCC<sub>900</sub> material exhibits remarkable activity and selectivity, of which the onset potential reaches 0.83 V vs. reversible hydrogen electrode in 0.1 M KOH and the H<sub>2</sub>O<sub>2</sub> selectivity is over 95 % in a wide potential range. Comprehensive synchrotron-based near-edge X-ray absorption fine structure (NEXAFS) spectroscopy combined with electrocatalytic characterizations reveals the positive correlation between quinone content and 2 e<sup>−</sup> ORR performance. The effectiveness of chair-form quinone groups as the most efficient active sites is highlighted by the molecule-mimic strategy and theoretical analysis. |
|---|