Example：10.1021/acsami.1c06204 or Chem. Rev., 2007, 107, 2411-2502
Efficient electrochemical water oxidation to hydrogen peroxide over intrinsic carbon defect-rich carbon nanofibers Journal of Materials Chemistry A (IF12.732), Pub Date : 2021-09-27, DOI: 10.1039/d1ta06306e Yanhui Sun, Xin Chen, Shangbo Ning, Wei Zhou, Zhongshan Yang, Jiwei Cui, Defa Wang, Jinhua Ye, Lequan Liu
The two-electron water oxidation reaction (2e−-WOR) provides a promising route to produce hydrogen peroxide (H2O2) from water; but it is currently hampered by low H2O2 partial current. Here, intrinsic carbon defect-rich carbon nanofibers are demonstrated to be highly effective for electrochemical 2e−-water oxidation. A H2O2 current density of 72.6 mA cm−2 is achieved at 2.9 V vs. RHE which is among the highest values reported for the 2e−-WOR. XPS and NEXAFS studies indicate that pentagonal and octagonal ring defects are dominant in the optimal sample. A combination of DFT calculations and a methanol competitive oxidation experiment reveals that ring defects effectively reduce the adsorption strength of OH*, which ultimately promotes the 2e−-WOR for valuable H2O2 production. Our study makes a helpful attempt in exploring carbon-based materials for efficient 2e−-WOR electrocatalysts.