Tunable and Efficient Tin Modified Nitrogen‐Doped Carbon Nanofibers for Electrochemical Reduction of Aqueous Carbon Dioxide,Advanced Energy Materials

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Tunable and Efficient Tin Modified Nitrogen‐Doped Carbon Nanofibers for Electrochemical Reduction of Aqueous Carbon Dioxide
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-01-05 , DOI: 10.1002/aenm.201702524
Yong Zhao ₁ , Jiaojiao Liang ₂ , Caiyun Wang ₁ , Jianmin Ma ₂ , Gordon G. Wallace ₁

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Efficient and selective earth‐abundant catalysts are highly desirable to drive the electrochemical conversion of CO₂ into value‐added chemicals. In this work, a low‐cost Sn modified N‐doped carbon nanofiber hybrid catalyst is developed for switchable CO₂ electroreduction in aqueous medium via a straightforward electrospinning technique coupled with a pyrolysis process. The electrocatalytic performance can be tuned by the structure of Sn species on the N‐doped carbon nanofibers. Sn nanoparticles drive efficient formate formation with a high current density of 11 mA cm⁻² and a faradaic efficiency of 62% at a moderate overpotential of 690 mV. Atomically dispersed Sn species promote conversion of CO₂ to CO with a high faradaic efficiency of 91% at a low overpotential of 490 mV. The interaction between Sn species and pyridinic‐N may play an important role in tuning the catalytic activity and selectivity of these two materials.

中文翻译：

可调谐和高效的锡改性氮掺杂碳纳米纤维，用于电化学还原二氧化碳水溶液

高效，选择性的富含地球的催化剂对于推动CO ₂电化学转化为增值化学品非常有必要。在这项工作中，开发了一种低成本的Sn改性的N掺杂碳纳米纤维杂化催化剂，该催化剂通过直接电纺丝技术和热解工艺在水性介质中进行可切换的CO ₂电还原。可以通过N掺杂碳纳米纤维上Sn物种的结构来调节电催化性能。Sn纳米颗粒在690 mV的中度过电势下以11 mA cm ^-2的高电流密度和62％的法拉第效率驱动有效的甲酸形成。原子分散的锡物质促进CO _2的转化在490 mV的低过电势下具有高达91％的法拉第效率的CO。Sn物种与吡啶N之间的相互作用可能在调节这两种材料的催化活性和选择性方面起着重要作用。

更新日期：2018-01-05

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