Inducing a Synergistic Effect on Pt<sup>δ+</sup>/Electron-Rich Sites via a Platinization Strategy: Generating Hyper-High Current Density in Hydrogen Evolution Reaction
Shanshan Wang, Qin Zhao, Quanlei Ma, Rong Z. Gan, Yiling Ran, Weizhen Fang, Cui‐Juan Wang, Ling Fang, Qingguo Feng, Yan Zhang, Dingsheng Wang, Yadong Li
Abstract
Herein, we propose a platinization strategy for the preparation of Pt/X catalysts with low Pt content on substrates possessing electron-rich sites (Pt/X: X = Co 3 O 4, NiO, CeO 2, Covalent Organic Framework (COF), etc.). In examples with inorganic and organic substrates, respectively, Pt/Co 3 O 4 possesses remarkable catalytic ability toward HER, achieving a current density at an overpotential of 500 mV that is 3.22 times higher than that of commercial Pt/C. It was also confirmed by using operando Raman spectroscopy that the enhancement of catalytic activity was achieved after platinization of the COF, with a reduction of overpotential from 231 to 23 mV at 10 mA cm –2 . Density functional theory (DFT) reveals that the improved catalytic activity of Pt/Co 3 O 4 and Pt/COF originated from the re-modulation of Pt δ+ on the electronic structure and the synergistic effect of the interfacial Pt δ+ /electron-rich sites. This work provides a rapid synthesis strategy for the synthesis of low-content Pt catalysts for electrocatalytic hydrogen production.