Lv Hao, Chen Xin, Fu Cheng, She Peiliang, Xu Dongdong, Liu Ben
Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science , Nanjing Normal University , Nanjing 210023 , China.
ME Genomics Inc. , Software Industry Base , Shenzhen 518000 , China.
Inorg Chem. 2019 Aug 19;58(16):11195-11201. doi: 10.1021/acs.inorgchem.9b01794. Epub 2019 Jul 26.
Asymmetric bowl-shaped metals make up an important class of nanostructured materials that exhibit great potentials in catalysis, energy storage, and biomedical applications. Introducing the mesopores within the framework of bowl-shaped metals would further increase the surface area and thus increase the utilization efficiency of metals and the availability of the (electro)catalytically active sites. In this work, a one-pot surfactant-templated aqueous synthesis is developed to fabricate nanosized asymmetric platinum (Pt) bowl-shaped mesoporous nanospheres (BMSs) with good purity and uniformity. Amphiphilic dioctadecyldimethylammonium chloride acts as the "dual-template" surfactant that drives the anisotropic nucleation and growth of mesoporous Pt islands with cylinder micelles along the curved surface of the vesicles, resulting in the formation of the Pt BMSs with a bowl-shaped morphology and mesoporous structure. The diameter of the Pt BMSs can also be tailored by changing the reduction kinetics during the synthesis. More interestingly, the BMSs are able to interconnect into a more sophisticated structure of one-dimensional nanochains by increasing the KPtCl amount added. This novel synthetic protocol brings a higher hierarchy into asymmetric bowl-shaped metals, rendering the metal BMSs with more accessible (electro)catalytically active sites. Because of the unique morphology and structure, the Pt BMSs show enhanced electrocatalytic activity and stability toward the hydrogen evolution reaction with respect to a commercial Pt/C catalyst.
不对称碗状金属构成了一类重要的纳米结构材料，在催化、能量存储和生物医学应用中展现出巨大潜力。在碗状金属框架内引入介孔将进一步增加表面积，从而提高金属的利用效率以及（电）催化活性位点的可及性。在这项工作中，开发了一种一锅法表面活性剂模板水相合成方法，以制备具有良好纯度和均匀性的纳米级不对称铂（Pt）碗状介孔纳米球（BMS）。两亲性二辛基二甲基氯化铵充当“双模板”表面活性剂，驱动介孔Pt岛沿着囊泡曲面以圆柱状胶束进行各向异性成核和生长，从而形成具有碗状形态和介孔结构的Pt BMS。Pt BMS的直径也可以通过改变合成过程中的还原动力学来进行调控。更有趣的是，通过增加添加的KPtCl量，BMS能够相互连接形成更复杂的一维纳米链结构。这种新颖的合成方案为不对称碗状金属带来了更高的层级结构，使金属BMS具有更多可及的（电）催化活性位点。由于其独特的形态和结构，相对于商业Pt/C催化剂，Pt BMS对析氢反应表现出增强的电催化活性和稳定性。
