共价有机框架负载贵金属铂用于电催化析氢

本工作探究了共价有机框架负载贵金属Pt的电催化析氢性能。以2, 6-二氨基蒽醌和2,4,6-三甲酰基间苯三酚为构筑单元，采用溶剂热法合成了TP-DAAQ COF。随后通过金属前驱体浸渍法制备了Pt-TP-DAAQ COF。X射线粉末衍射，傅里叶红外光谱，氮气吸附/脱附等表明成功制备了TP-DAAQ COF和Pt-TP-DAAQ COF。电化学测试结果表明Pt-TP-DAAQ COF (其中含有5.8%的Pt)展现了比20% Pt/C还优异的电催化活性。当电流密度为10 mA cm?2时，Pt-TP-DAAQ COF的过电位为45 mV，Tafel 斜率为29 mV dec?1。这高效的电催化活性源于TP-DAAQ COF与Pt之间良好的协同效应。Pt-TP-DAAQ COF具有较大的比表面积和规整的一维孔道，使催化位点更易于与电解液中的物质发生接触和相互作用，从而增强了其催化性能。

Covalent Organic Frameworks Supported Noble-Metal Pt for Electrocatalytic Hydrogen Evolution

This work explored the electro-catalytic hydrogen evolution performance of covalent organic frameworks loaded with noble metal Pt. Tp-DAAQ COF was synthesized by solvothermal method using 2, 6-diaminoanthraquinone and 2,4,6-Triformylphloroglucinol as building blocks. Subsequently, Pt-TP-DAAQ COF was prepared by impregnation of metal precursor. X-ray powder diffraction, Fourier infrared spectroscopy, nitrogen adsorption/desorption showed that TP-DAAQ COF and Pt-TP-DAAQ COF were prepared successfully. The results of electrochemical tests showed that Pt-TP-DAAQ COF with a 5.8% Pt content showed better electrocatalytic activity than 20% Pt/C. When the current density is 10 mA cm?2, the overpotential of Pt-TP-DAAQ COF is 45 mV, and the Tafel slope is 29 mV dec?1. The synergistic effect between TP-DAAQ COF and Pt enhances the electrocatalytic activity of Pt-TP-DAAQ COF. Pt-TP-DAAQ COF has a larger specific surface area and regular one-dimensional channels, making catalytic sites more accessible for interaction with substances in the electrolyte, thereby enhancing its catalytic performance.