Unprecedented Synthesis of Holey 2D Layered Double Hydroxide Nanomesh for Enhanced Oxygen Evolution
Unprecedented Synthesis of Holey 2D Layered Double Hydroxide Nanomesh for Enhanced Oxygen Evolution
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前所未有的多孔二维层状双氢氧化物纳米网合成，以增强析氧能力
DOI：
10.1002/aenm.201803060
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发表时间：
2019-01-03
影响因子：
27.8
通讯作者：
Qu, Xuanhui
中科院分区：
文献类型：
--
作者：
Qin, Mingli;Li, Shumei;Qu, Xuanhui
在二维材料中形成纳米孔可以增加材料的边缘位置，改善传质性能，使材料具有不同的物理性能，在滤膜、电子和储能器件、催化剂等领域显示出潜在的应用前景。这种材料的一个标志性成员是多孔石墨烯。本文设计并合成了一种独特的二维层状双氢氧化物(LDH)纳米网格作为一类新型的二维孔道材料。这是所有已发表的报道中第一例用剥离法制备二维孔材料的案例。作为析氧反应电催化剂，2D CoCo-LDH纳米网格的起始过电位(220 MV)明显低于致密的无孔纳米片(270 MV)，这是因为穿过平面的孔提供了更多的高活性边位置，配位数较低，促进了质量扩散。这项工作为设计用于能量转换和存储的二维多孔材料开辟了一条新的途径。
Creating nanosized pores in 2D materials can increase the edge sites, improve the mass transfer, and contribute to different physical properties, which shows potential applications in many fields including filtration membranes, electronics and energy storage devices, and catalysts. An iconic member of this type of material is porous graphene. Herein, a unique 2D layered double hydroxide (LDH) nanomesh is designed and synthesized as a new class of 2D holey materials. It represents the first case of exfoliation method for preparing 2D holey materials among all published reports. As an oxygen evolution reaction electrocatalyst, the 2D CoCo‐LDH nanomesh has apparently lower onset overpotential (220 mV) than that of compact nanosheets without holes (270 mV) owing to the pores through the plane that offer more highly active edge sites with lower coordination number and promote the mass diffusion. This work opens up a new avenue for designing 2D porous materials for energy conversion and storage.