Li Shuke, Wang Ran, Xie Meng, Xu Yanchao, Chen Jianrong, Jiao Yang
College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China.
College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China.
J Colloid Interface Sci. 2022 Sep 15;622:378-389. doi: 10.1016/j.jcis.2022.04.131. Epub 2022 Apr 29.
The main challenge hindering the use of Pt nanoparticles (Pt NPs) for electrochemical applications is their high cost and agglomeration. Herein, a trifunctional electrode material based on a two-dimensional cerium-based metal organic framework (2D Ce-MOF) decorated with Pt NPs is constructed. The large specific surface area of the 2D Ce-MOF can effectively prevent the phenomenon of Pt NPs reaction. The strong synergy between Pt NPs and the 2D Ce-MOF not only significantly enhances electron transport efficiency, but also increases the number of electrochemically reaction reactive sites. As a result, the Ce-MOF@Pt presents excellent performance in the HER (Hydrogen Evolution Reaction), OER (Oxygen Evolution Reaction) and supercapacitor reactions. The Tafel slopes of OER and HER are 47.9 and 188.1 mV dec, respectively. Meanwhile, Ce-MOF@Pt-0.05 shows a specific capacity of 1894F g at a current density of 1 A g and remains at 111.5% of the initial capacitance after 3000 cycles. In general, this study highlights the importance of Pt NPs in promoting the electrochemical performance of MOFs and reveals a new way to reduce electrocatalyst prices.
阻碍将铂纳米颗粒（Pt NPs）用于电化学应用的主要挑战是其高成本和团聚问题。在此，构建了一种基于二维铈基金属有机框架（2D Ce-MOF）并装饰有Pt NPs的三功能电极材料。2D Ce-MOF的大比表面积可有效防止Pt NPs反应现象。Pt NPs与2D Ce-MOF之间的强协同作用不仅显著提高了电子传输效率，还增加了电化学反应活性位点的数量。结果，Ce-MOF@Pt在析氢反应（HER）、析氧反应（OER）和超级电容器反应中表现出优异的性能。OER和HER的塔菲尔斜率分别为47.9和188.1 mV dec。同时，Ce-MOF@Pt-0.05在1 A g的电流密度下显示出1894F g的比容量，并且在3000次循环后仍保持初始电容的111.5%。总体而言，本研究突出了Pt NPs在促进MOFs电化学性能方面的重要性，并揭示了一种降低电催化剂价格的新方法。
