Research on Performance Improvement of Carbon-based Catalysts for the Electrocatalytic Production of H2O2:Comparison of Pore Size Regulation and F-doping
A comparative study is conducted between the effects of pore size regulation and F-do-ping on the performance of carbon-based catalytic materials for the electrocatalytic preparation of H2O2.During the hydrothermal synthesis of porous carbon microsphere,the assembly behavior of the carbon precursor was changed by adding a certain amount of silicon species into the synthesis system.As a result,the pore size of the prepared porous carbon microsphere is enlarged.In addition,fluorine is successfully introduced into carbon framework through impregnating the prepared porous carbon micro-sphere in HF solution.The results of electrochemical tests indicate that the pore size regulation and F-doping both can cause the enhancement of the activity and selectivity of the porous carbon in the 2e-ox-ygen reduction reaction.Further,the pore size regulation has a more significant influence on the selec-tivity while the F-doping has a better effect on improving the catalytic activity.Moreover,the F-do-ping endows the porous carbon with higher energy utilization efficiency.Thus,the F-doped sample ex-hibits a higher H2O2 yield than the sample with enlarged pore size.
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