Loading Pt Nanoparticles on Metal–Organic Frameworks for Improved Oxygen Evolution
2017
Guo, Jinxue | Zhang, Xinqun | Sun, Yanfang | Tang, Lin | Liu, Qingyun | Zhang, Xiao
An electrochemical oxygen evolution reaction (OER) is the crucial and limiting reaction in several renewable energy conversion systems, and metal–organic frameworks (MOFs) have triggered increasing research interests as potential catalysts toward OER. Deeper understanding of the OER activity over MOFs is extremely desired for the exploitation of robust MOFs-based electrocatalysts. Herein, Pt nanoparticles are loaded on Prussian blue analogues (Co₃[Fe(CN)₆]₂ and Ni₃[Fe(CN)₆]₂ nanocubes) to obtain improved catalytic activity. Co₃[Fe(CN)₆]₂ and Ni₃[Fe(CN)₆]₂ are rationally selected because of their containing of the fascinating transition metals of Co and Ni species. Using the hybrid catalyst as the modular system, we demonstrate the inspiring effect of Pt on the OER activity of MOFs. Detailed exploration conclusively demonstrates that Pt supplies combined advantages for the enhanced OER activity of MOFs, such as improving the intrinsic catalytic activity by tuning the valence state of transition metals (Co, Ni), increasing active sites, and enhancing charge transfer. Moreover, thorough electrochemical studies are also performed to declare the key role of Pt in the excellent catalytic activity and stability. We believe that introduction of trace amounts of Pt or other noble metals will be an effective solution to achieve a significant improvement in the OER activity of MOFs.
显示更多 [+] 显示较少 [-]