| Aiming at the problem that the electrodes electrochemically producing hydrogen peroxide are mostly powdered carbon, microchannel carbon blocks are obtained by carbonizing natural pine wood, and then treated by hydrogen peroxide oxidation, air oxidation, oxalic acid oxidation, mixed solution oxidation respectively. In the two-tank reactor, the microchannel carbon blocks and the microchannel carbon blocks treated by the four methods are used as the cathode and Pt as the anode, respectively. The ability of the material to produce hydrogen peroxide before and after treatment is investigated. The relationship of the hydrophilicity, oxygen content, current density and hydrogen peroxide production with the oxidative treatment is investigated. The results show that the concentrations of hydrogen peroxide produced by the untreated and the treated materials are 1 340, 3 520, 1 651, 2 293 and 1 619 μmol/L, respectively. It can be seen that all four treatment methods can increase the production of hydrogen peroxide. And the hydrogen peroxide yield is increased by 1.63 times through hydrogen peroxide oxidation, the increased yield is the most. The hydrogen peroxide oxidation treatment not only improves the hydrophilicity of the material and promotes the diffusion of oxygen, but also increases CO and COOH groups, then increases the current density and facilitates the production of hydrogen peroxide. |
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