PVP掺杂PAN静电纺丝制备自支撑碳基电极用于氧还原法生产H2O2
Self-supported carbon-based electrodes prepared by PVP-doped PAN electrostatic spinning for H2O2 production by oxygen reduction method
高阳 1王昭晖 1吕臻 1陈咏梅1
作者信息
- 1. 北京化工大学 化学学院,北京 100029
- 折叠
摘要
以聚乙烯吡咯烷酮(PVP)和聚丙烯腈(PAN)的混合液为纺丝液,利用静电纺丝技术制备PVP-PAN纳米纤维膜片,经过预氧化、碳化过程,获得自支撑碳片(PVP-PCNFs).SEM图像及BET测试结果表明碳片中纳米纤维整体保持完整性,因碳化过程中部分PVP提前分解而在纤维内部及表面产生缺陷,比表面积增大;XPS结果表明碳片中氧元素及吡咯氮的相对含量相较于PVP改性前有显著增加.电化学测试结果表明该自支撑碳片作为电极表现出较好的2e-ORR催化性能,旋转圆盘电极(RRDE)测试结果表明在0.687 V RHE处2e-ORR选择性为72.6%;恒电位0.5 V RHE电解产生过氧化氢法拉第效率为80.5%,且催化性能在15 000 s电解时间内保持稳定.利用静电纺丝技术制备自支撑电极作为氧还原法生成过氧化氢的阴极,有望大幅缩短电化学法生成过氧化氢技术的实用化进程.
Abstract
A mixture of polyvinylpyrrolidone(PVP)and polyacrylonitrile(PAN)was used as the spinning solution,and PVP-PAN nanofibrous membrane sheets were prepared by electrostatic spinning technique,and self-supporting carbon flakes(PVP-PCNFs)were obtained after a pre-oxidation and carbonisation process.SEM images and BET test results show that the overall integrity of the nanofibres in the carbon sheet is maintained,and the specific surface area is increased due to the defects generated inside and on the surface of the fibres as a result of the early decomposition of part of the PVP during the carbonisation process;the XPS results show that the relative contents of elemental oxygen and pyrrolic nitrogen in the carbon sheet are significantly increased compared with those before the modification of the PVP.The electrochemical test results show that the self-supported carbon sheet as an electrode exhibits better 2e-ORR catalytic performance,and the rotating disc electrode(RRDE)test results indicate that the 2e-ORR selectivity is 72.6% at 0.687 V RHE;the H2O2 Faraday efficiency of H2O2 production by electrolysis at a constant potential of 0.5 V RHE is 80.5% and the catalytic performance remains stable for 15 000 s of electrolysis time.The use of electrostatic spinning technology to prepare self-supporting electrodes as cathodes for the generation of hydrogen peroxide by oxygen reduction is expected to significantly shorten the process of practical application of electrochemical hydrogen peroxide generation technology.
关键词
静电纺丝/碳基电极/自支撑电极/2e-ORR过程/电化学生成H2O2Key words
electrostatic spinning/carbon-based electrode/self-supported electrode/2e-ORR process/electrochemical generation of H2O2引用本文复制引用
出版年
2024
NETL
NSTL
万方数据