胶原纤维基多孔碳纤维用于电化学产双氧水——酸处理对产双氧水性能的影响

Electro-generation of hydrogen peroxide on the porous carbon fiber fabricated on the basis of collagen fiber——Investigation on the effect of acid treatment on its performance

为获得通过电化学的氧还原反应(ORR)高效原位生成双氧水(H_2O_2)的新型碳材料,基于一类天然生物质-皮胶原纤维为基础材料制备出多孔碳纤维材料(PCFs-x).利用皮胶原纤维分子中的-COOH、-NH_2等官能团与铁盐之间的较强的络合作用来吸附铁离子,碳化后经酸浸获得PCFs-x材料.XRD、SEM、BET等手段对不同浓度硝酸浸取后所获得的PCFs-x进行系统的结构表征,测试其电子转移数,考察了其氧还原反应活性及电化学还原氧气产H_2O_2的性能.结果表明,胶原纤维经过上述制备流程后可获得有序结构的PCFs-x,其中浓度为1mol/L时获得的材料具有最好的产H_2O_2效果和电流效率,氧还原反应2.5h后H_2O_2累积浓度达到148.81mg/L,电流效率72.33%.实验结果为基于胶原纤维制备新型高效的原位电化学产双氧水的碳材料提供了理论基础与可借鉴的思路.

In the present work,orderly porous carbon fiber was fabricated on the basis of collagen fibers,a kind of biomass widely existed in the nature,to electro-generate hydrogen peroxide(H2O2)through oxygen oxidation reaction(ORR)with a satisfactory performance.The carbon fiber material was obtained through the procedures as follow:adsorption of iron ion onto collagen fiber via the complexation reaction between the iron ion and the function groups of collagen fiber,such as-COOH and-NH2,carbonization in the vacuum,and leaching of iron oxide by nitric acid.Meanwhile,the material’s structure was thoroughly characterized by means of XRD、SEM、BET and so on.Finally,the elctro-chemical activity and efficiency for electro-genenation H2O2 of the material were investigated.It was found that porous carbon fiber was fabricated through the procedure described above,and the carbon material obtained by leaching iron oxide by nitric acid with a concentration of 1.0mol/L possess the optimal performance for electro-generation of H2O2,i.e.cumulative concentration of H2O2 reaching 148.81mg/L after oxygen oxidation reaction for 2.5h with the corrsponding current efficiency of 72.33%.It is anticipated that our work could provide new insights for the fabrication of a novel carbon fiber for in-situ electro-generation of hydrogen peroxide with improved performance.