Interplanar Growth of 2D Non‐Van der Waals Co2N‐Based Heterostructures for Efficient Overall Water Splitting,Advanced Energy Materials

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Interplanar Growth of 2D Non‐Van der Waals Co2N‐Based Heterostructures for Efficient Overall Water Splitting
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-10-07 , DOI: 10.1002/aenm.202002214
Jingyun Jiang ₁ , Pengfei Yan ₁ , Yannan Zhou ₁ , Zhenfeng Cheng ₁ , Xinwei Cui ₁ , Yifei Ge ₂ , Qun Xu _{1,

3}

Affiliation

The design and synthesis of 2D heterostructured materials for water splitting are normally based on van der Waals (vdW) nanosheets, but this approach is gradually approaching a performance ceiling in terms of activity and stability. Herein, a novel heterostructured system is explored based on 2D non‐vdW and conductive nanosheets. Notably, the interplanar growth of 2D non‐vdW Co₂N nanosheets is realized between graphene layers in the current collector of carbon fiber papers (CPs), generating an interlocking structure within CPs. The exposed surface of Co₂N nanosheets possesses a high surface energy that anchors highly active CoNC, forming 2D CoNC@Co₂N heterostructures outside CPs. This integrated electrocatalytic system bridged by non‐vdW Co₂N nanosheets presents a low overpotential of 1.52 V and an excellent stability of 280 h, which outperform most bifunctional and nonprecious‐metal‐based electrocatalysts in alkaline media, owing to the nature of 2D non‐vdW nanosheets and the formation of strong and conductive connections among CoNC, nanosheets, and CPs.

中文翻译：

二维非范德华基于Co2N的异质结构的面内生长，以实现有效的总水分解

用于水分解的2D异质结构材料的设计和合成通常基于van der Waals（vdW）纳米片，但是这种方法在活性和稳定性方面正逐渐接近性能极限。在本文中，基于二维非vdW和导电纳米片，探索了一种新颖的异质结构系统。值得注意的是，二维非vdW Co ₂ N纳米片的平面生长是在碳纤维纸（CP）集电器中的石墨烯层之间实现的，从而在CP内产生了互锁结构。Co ₂ N纳米片的暴露表面具有高表面能，可锚定高活性CoNC，在CP外部形成2D CoNC @ Co ₂ N异质结构。这种由非vdW Co ₂桥接的集成电催化系统由于2D非vdW纳米片的性质以及形成牢固和导电的连接，N纳米片表现出1.52 V的低过电位和280 h的出色稳定性，在碱性介质中优于大多数双功能和基于非贵金属的电催化剂。在CoNC，纳米片和CP中。

更新日期：2020-11-25

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