The Proportion of Fe-NX , N Doping Species and Fe3 C to Oxygen Catalytic Activity in Core-Shell Fe-N/C Electrocatalyst.,Chemistry - An Asian Journal

当前位置： X-MOL 学术 › Chem. Asian J. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

The Proportion of Fe-NX , N Doping Species and Fe3 C to Oxygen Catalytic Activity in Core-Shell Fe-N/C Electrocatalyst.
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2019-12-19 , DOI: 10.1002/asia.201901571
Yanyan Liu _{1,

2} , Yihua Zhu ₁ , Hongliang Jiang ₃ , Jianhua Shen ₁ , Chunzhong Li _{1,

3}

Affiliation

A bifunctional oxygen electrocatalyst composed of iron carbide (Fe3 C) nanoparticles encapsulated by nitrogen doped carbon sheets is reported. X-ray photoelectron spectroscopy and X-ray absorption near edge structure revealed the presence of several kinds of active sites (Fe-Nx sites, N doping sites) and the modulated electron structure of nitrogen doped carbon sheets. Fe3 C@N-CSs shows excellent oxygen evolution and oxygen reduction catalytic activity owing to the modulated electron structure by encapsulated Fe3 C core via biphasic interfaces electron interaction, which can lower the free energy of intermediate, strengthen the bonding strength and enhance conductivity. Meanwhile, the contribution of the Fe-Nx sites, N doping sites and the effect of Fe3 C core for the electrocatalytic oxygen reaction is originally revealed. The Fe3 C@N-CSs air electrode-based zinc-air battery demonstrates a high open circuit potential of 1.47 V, superior charge-discharge performance and long lifetime, which outperforms the noble metal-based zinc-air battery.

中文翻译：

Fe-NX，N掺杂物种和Fe3 C在核-壳Fe-N / C电催化剂中对氧催化活性的比例。

报道了一种双功能氧电催化剂，该催化剂由掺有氮的碳片封装的碳化铁（Fe3 C）纳米颗粒组成。X射线光电子能谱和边缘结构附近的X射线吸收表明存在几种活性位点（Fe-Nx位点，N掺杂位点）和氮掺杂碳片的调制电子结构。Fe3 C @ N-CSs由于通过双相界面电子相互作用封装的Fe3 C核的调制电子结构而具有优异的氧释放和氧还原催化活性，可降低中间体的自由能，增强键合强度并增强导电性。同时，最初揭示了Fe-Nx位点，N掺杂位点的贡献以及Fe3C核对电催化氧反应的影响。

更新日期：2019-12-19

点击分享查看原文

点击收藏

阅读更多本刊最新论文