关键词: 质子交换膜电解水, 析氧反应, 二氧化铱催化剂, 稀土元素钇, 金属-载体相互作用

Abstract:

Proton exchange membrane water electrolysis (PEMWE) is a water electrolysis process with high current density, fast dynamic response and high hydrogen purity. To achieve its efficient industrial application, the development of inexpensive, efficient and stable oxygen evolution catalysts is particularly important. In this paper, a two-step synthesis method was used to dope the rare earth element yttrium (Y) into amorphous carbon supports to modify the surface of iridium dioxide (IrO₂) particles. The prepared IrO₂/Y _x C exhibited excellent catalytic activity for the acidic oxygen evolution reaction with a required overpotential of only 270mV at a current density of 10mA/cm², which was lower than that of undoped IrO₂/C (300mV) and commercial IrO₂ (310mV). The enhancement of the metal carrier interaction between the carbon carrier and its surface iridium dioxide particles by Y doping led to changes in the electron density around the Ir active site, thereby facilitating the regulation of the adsorption of reaction intermediates and optimizing the reaction rate. This research provided a new catalyst design approach for the oxygen evolution process in PEMWE, and was expected to promote the wider application of PEMWE technology in the field of clean energy.

Key words: proton exchange membrane water electrolysis, oxygen evolution reaction, iridium dioxide catalyst, rare earth element yttrium, metal-carrier interaction