Mesoporous LDH Metastructure from Multiscale Assembly of Defective Nanodomains by Laser Shock for Oxygen Evolution Reaction,Small

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Mesoporous LDH Metastructure from Multiscale Assembly of Defective Nanodomains by Laser Shock for Oxygen Evolution Reaction
Small ( IF 13.0 ) Pub Date : 2022-08-07 , DOI: 10.1002/smll.202202403
Wendi Yi ₁ , Haoqing Jiang _{1,

2} , Gary J Cheng _{1,

3,

4}

Affiliation

Laser is a powerful tool for the synthesis of nanomaterials. The intensive laser pulses delivered to materials within nanoseconds allow the formation of novel structures that are inaccessible for conventional methods. Layered double hydroxide (LDH) nanostructures with high porosity, suitable dopants, and rich defects are desirable for catalysts, however, tremendously difficult in a one-pot synthesis. Here it is found that confined laser shock in solvent leads to the formation of nanoreactors which guide the assembly of multiscale LDH building units, larger nanosheets as frame and smaller nanodomains as building blocks. These nanodomains have rich vacancy defects and are interlocked in a high packed density of 10¹³ cm⁻², leaving rich mesopores across the nanosheets and coral-like morphology. Like the natural coral reef that has multiscale structure to accommodate different marine organisms, the coral-like LDH metastructure provides large surface area and rich active sites for the interaction with guest molecules. Benefiting from the multiscale porous structure and rational dopant, this LDH catalyst exhibits a low overpotential of 220 mV at 10 mA cm⁻² for oxygen evolution reaction (OER), standing as one of the best LDH catalysts to date.

中文翻译：

通过激光冲击用于析氧反应的多尺度缺陷纳米域组装的介孔 LDH 元结构

激光是合成纳米材料的有力工具。在纳秒内传递到材料的强激光脉冲允许形成传统方法无法获得的新结构。具有高孔隙率、合适的掺杂剂和丰富的缺陷的层状双氢氧化物 (LDH) 纳米结构是催化剂的理想选择，然而，在一锅法合成中非常困难。在这里发现溶剂中的受限激光冲击导致纳米反应器的形成，纳米反应器引导多尺度 LDH 构建单元的组装，较大的纳米片作为框架，较小的纳米域作为构建单元。这些纳米域具有丰富的空位缺陷并以10 ¹³ cm ^{-2的高堆积密度互锁}，在纳米片和珊瑚状形态上留下丰富的中孔。就像具有多尺度结构以适应不同海洋生物的天然珊瑚礁一样，珊瑚状的 LDH 超结构为与客体分子的相互作用提供了大的表面积和丰富的活性位点。得益于多尺度多孔结构和合理的掺杂剂，这种 LDH 催化剂在 10 mA cm ^-2时表现出 220 mV 的低过电势，用于析氧反应（OER），是迄今为止最好的 LDH 催化剂之一。

更新日期：2022-08-07

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