Defective Carbon–CoP Nanoparticles Hybrids with Interfacial Charges Polarization for Efficient Bifunctional Oxygen Electrocatalysis,Advanced Energy Materials

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Defective Carbon–CoP Nanoparticles Hybrids with Interfacial Charges Polarization for Efficient Bifunctional Oxygen Electrocatalysis
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-02-21 , DOI: 10.1002/aenm.201703623
Yunxiang Lin ₁ , Li Yang ₁ , Youkui Zhang _{1,

2} , Hongliang Jiang ₁ , Zijian Xiao ₁ , Chuanqiang Wu ₁ , Guobin Zhang ₁ , Jun Jiang ₁ , Li Song ₁

Affiliation

The development of efficient catalysts for both oxygen reduction and evolution reactions (oxygen reduction reaction (ORR) and oxygen evolution reaction (OER)) is central to regenerative fuel cells and rechargeable metal–air batteries. It is highly desirable to achieve the efficient integration of dual active components into the catalysts and to understand the interaction between the dual components. Here, a facile approach is demonstrated to construct defective carbon–CoP nanoparticle hybrids as bifunctional oxygen electrocatalysts, and further probe the interfacial charge distribution behavior. By combining multiple synchrotron‐based X‐ray spectroscopic characterizations with density functional theory calculations, the interfacial charge polarization with the electrons gathering at the defective carbon surface and the holes gathering at the CoP surface due to strong interfacial coupling is revealed, which simultaneously facilitates the ORR and OER with remarkable bifunctional oxygen electrode activities. This work not only offers a bifunctional oxygen catalyst with outstanding performance, but also unravels the promoting factor of the hybrids from the view of interfacial charge distribution.

中文翻译：

具有缺陷的碳-CoP纳米粒子杂化剂，具有界面电荷极化，可有效地进行双功能氧电催化

开发用于氧还原和放出反应（氧还原反应（ORR）和氧放出反应（OER））的高效催化剂对于再生燃料电池和可充电金属空气电池至关重要。非常需要实现双重活性组分到催化剂中的有效结合并理解双重组分之间的相互作用。在这里，展示了一种简便的方法来构造有缺陷的碳-CoP纳米颗粒杂化物作为双功能氧电催化剂，并进一步探究界面电荷的分布行为。通过将多个基于同步加速器的X射线光谱表征与密度泛函理论计算相结合，揭示了由于强界面耦合导致电子聚集在有缺陷的碳表面和空穴聚集在CoP表面的界面电荷极化，这同时促进了ORR和OER具有显着的双功能氧电极活性。这项工作不仅提供了具有出色性能的双功能氧催化剂，而且从界面电荷分布的角度揭示了杂化反应的促进因素。

更新日期：2018-02-21

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