双功能
电催化剂
材料科学
异质结
化学工程
肖特基势垒
电池(电)
催化作用
纳米技术
电极
化学
光电子学
二极管
电化学
有机化学
物理化学
工程类
物理
功率(物理)
量子力学
作者
Haoqi Yang,Bingdi Wang,Haoqi Yang,Guolong Lu,Zhenning Liu
标识
DOI:10.1016/j.cej.2021.131589
摘要
In this contribution, a high-performance bifunctional electrocatalyst composed of Co/Co2P nanoparticles encapsulated in nitrogen and phosphorus co-doped carbon nanotubes (NPCNTs) has been synthesized via a mechanochemistry-pyrolysis approach. The Schottky effect of metal-semiconductor heterojunction affords a built-in electric field at the interfaces to enhance electron transport, whereas the intertwined structure of one-dimensional (1D) NPCNTs facilitates the mass transfer of reactants and intermediates. Therefore, the as-prepared Co/Co2[email protected] catalyst exhibits outstanding bifunctional ORR/OER activities, which are superior to those of commercial Pt/C and RuO2. It can also deliver a high power density and cycling life when used as the cathode for rechargeable ZABs. Theoretical calculation confirms that the spontaneous electron transport from Co to Co2P enables an up-shifted d-band center of Co/Co2P heterojunctions, which is beneficial for the intermediate adsorption in electrocatalytic process.
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