过电位
超塑性
材料科学
金属有机骨架
电催化剂
纳米技术
电解
化学工程
电解水
电极
冶金
电化学
化学
微观结构
电解质
有机化学
吸附
工程类
物理化学
作者
Yuntong Sun,Sen Xu,César A. Ortíz‐Ledón,Jun Zhu,Sheng Chen,Jingjing Duan
出处
期刊:Exploration
[Wiley]
日期:2021-09-23
卷期号:1 (2)
被引量:56
摘要
Applications for metal-organic frameworks (MOFs) demand their assembly into three-dimensional (3D) macroscopic architectures. The capability of sustaining structural integrity with considerable deformation is important to allow a monolithic material to work reliably. Nevertheless, it remains a significant challenge to introduce superplasticity in 3D MOF networks. Here, we report a general procedure for synthesizing 3D superplastic MOF aerogels inspired by the hierarchical architecture of natural corks. The resultant MOFs exhibited excellent superplasticity that can recover fully and rapidly to its original dimension after 50% strain compression and unloading for >2000 cycles. The 3D superplastic architecture is achieved by successively assembling one-dimensional (1D) to two-dimensional (2D) and then 3D, in a variety of MOFs with different transition metal active sites (Co-, NiMn-, NiCo-, NiCoMn-) and organic ligands (2-thiophenecarboxylic acid and glutaric acid). Latent applications have been demonstrated for NiMn-MOF aerogels to serve as a new generation of flexible electrocatalysts for hydrogen evolution reaction (HER) from seawater splitting, which requires a low overpotential of 243 mV to achieve a current density of 10 mA·cm-2. Notably, the electrocatalyst remains stable even being deformed, as the overpotential to achieve a current density of 10 mA·cm-2 increases slightly to 270, 264, and 258 mV after one-, two-, and threefold, respectively. In great contrast, traditional MOF powder-electrodes demonstrate significant activity decay under similar conditions. This work opens up enormous opportunities for exploring new applications of MOFs in a freestanding, structurally adaptive, and macroscopic form.
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