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Origami‐Inspired 3D Interconnected Molybdenum Carbide Nanoflakes
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2018-01-15 , DOI: 10.1002/admi.201701113
Ryota Koizumi 1 , Sehmus Ozden 2 , Atanu Samanta 3 , Ana Paula P. Alves 4 , Avanish Mishra 3 , Gonglan Ye 1 , Glaura G. Silva 4 , Robert Vajtai 1 , Abhishek K. Singh 3 , Chandra S. Tiwary 1, 5 , Pulickel M. Ajayan 1
Affiliation  

High‐temperature stable transition metal carbides are one of the promising classes of materials for next‐generation energy applications such as water splitting catalysis and electrodes for energy storage devices. Herein, origami‐like molybdenum carbide flakes with interfacially connected structures in various orientations using an easily scalable chemical vapor deposition method are synthesized. Interestingly, each individual flake of similar orientation is interconnected across different planes. The interconnected architectures are found to be highly elastic and behave in a sponge‐like manner. In addition, the surface energy of each plane is calculated using the first‐principle density functional theory. The molybdenum carbide shows excellent activity for the hydrogen evolution reaction, with the onset over potential occurring around −16 to −25 mV with high stability. The material is used as an electrode for supercapacitors as a second demonstration. The supercapacitor constructed with polypyrrole reaches the specific capacitance of ≈279 F g−1 at a current density of 0.5 A g−1.

中文翻译:

折纸启发的3D互连碳化钼纳米片

高温稳定的过渡金属碳化物是用于下一代能源应用的有前途的材料类别之一,例如水分解催化和储能设备的电极。在此,使用易于扩展的化学气相沉积方法,合成了具有不同方向的界面连接结构的折纸状碳化钼薄片。有趣的是,取向相似的每个薄片都在不同的平面上相互连接。相互连接的体系结构具有很高的弹性,并且具有类似海绵的性能。另外,使用第一原理密度泛函理论计算每个平面的表面能。碳化钼对析氢反应具有出色的活性,具有在-16至-25 mV左右的高稳定状态的起始过电位。该材料被用作超级电容器的电极,这是第二次演示。用聚吡咯构建的超级电容器的比电容达到≈279 F g-1在0.5 A g的电流密度-1
更新日期:2018-01-15
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