氧化方式对碳阴极产过氧化氢性能增强作用

Enhancement of oxidation method on hydrogen peroxide production performance of carbon cathode

针对目前电化学产过氧化氢多采用粉末碳电极的问题,通过碳化天然松木得到微通道碳块,然后分别进行过氧化氢氧化、空气氧化、草酸氧化和混合溶液氧化4种处理方式.在双池反应器中,分别将未处理微通道碳块和4种方式处理的微通道碳块材料分别做阴极,Pt做阳极,研究了处理前后材料产过氧化氢能力,探究了氧化处理与材料亲水性、氧含量、电流密度以及过氧化氢产量之间的关系.结果显示,未处理和4种方式处理材料产过氧化氢的浓度分别为1340、3520、1651、2293、1619μmol/L.可见4种处理方式均能提高过氧化氢产量.过氧化氢氧化提高的量最多,提高了1.63倍.过氧化氢氧化处理不仅提高材料的亲水性,促进氧气扩散,而且增加的C=O和COOH基团可以提高电流密度,利于过氧化氢产生.

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 1340,3520,1651,2293 and 1619μmol/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 C=O and COOH groups,then increases the current density and facilitates the production of hydrogen peroxide.