Guangzhou Key Laboratory for Environmentally Functional Materials and Technology, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 51006, China.
Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, 541004, China.
Sci Rep. 2017 Jan 30;7:41542. doi: 10.1038/srep41542.
Considerable efforts have been devoted recently to design and fabrication of high performance and low cost electrocatalysts for oxygen evolution reaction (OER). However, catalytic activity of current electrocatalysts is usually restricted by high onset potential and limited active sites. Herein, we fabricated three-dimensional (3D) highly ordered mesoporous Pd-CoO composite materials as excellent electrocatalysts for OER in alkaline solution with high activity and stability. Three-dimensional highly ordered mesoporous CoO material was firstly synthesized using mesoporous silica KIT-6 as hard template. Then, Pd-CoO nanomaterials were prepared by a simple reduction method. The as-prepared 3D mesoporous Pd-CoO catalysts have ordered mesoporous structure with a high surface area of 81.0 m g. Three-dimensional highly ordered mesoporous structure can facilitate diffusion and penetration of electrolyte and oxygen. Moreover, the catalysts can also keep catalyst particles in a well dispersed condition with more catalytic active sites. Electrochemical measurements reveal that the 3D mesoporous Pd-CoO catalysts exhibit superior performance in alkaline solution with low onset potential (0.415 V vs. SCE) and excellent long-duration cycling stability.
最近，人们投入了大量精力来设计和制造用于氧气析出反应（OER）的高性能、低成本电催化剂。然而，目前电催化剂的催化活性通常受到高起始电位和有限的活性位的限制。在此，我们制备了三维（3D）有序介孔 Pd-CoO 复合材料，作为在碱性溶液中具有高活性和稳定性的优异 OER 电催化剂。首先，使用介孔硅 KIT-6 作为硬模板合成了三维有序介孔 CoO 材料。然后，通过简单的还原法制备了 Pd-CoO 纳米材料。所制备的 3D 介孔 Pd-CoO 催化剂具有有序介孔结构，比表面积高达 81.0 m2/g。三维有序介孔结构可以促进电解质和氧气的扩散和渗透。此外，催化剂还可以使催化剂颗粒保持良好的分散状态，增加更多的催化活性位。电化学测量表明，3D 介孔 Pd-CoO 催化剂在碱性溶液中具有低起始电位（0.415 V 与 SCE 相比）和优异的长期循环稳定性。
