钇掺杂二氧化铱用于高效酸性电化学析氧反应  

Yttrium doped iridium dioxide for efficient acidic electrochemical oxygen evolution reaction

作　　者：刘振宇 沈紫晨 曹东 郭晓燕 LIU Zhenyu;SHEN Zichen;CAO Dong;GUO Xiaoyan(The Research Institute,Sinopec Maoming Petrochemical Company,Maoming 525000,Guangdong,China;School of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]中国石油化工股份有限公司茂名分公司研究院,广东茂名525000 [2]北京化工大学化学工程学院,北京100029

出　　处：《化工进展》2024年第12期6855-6861,共7页Chemical Industry and Engineering Progress

基　　金：国家重点研发计划(2022YFB3807500)。

摘　　要：酸性质子交换膜电解水(PEMWE)是一种电流密度高、动态响应快、产氢纯度高的电解水工艺,为实现其高效工业级应用,开发廉价、高效、稳定的析氧催化剂尤为关键。本文通过两步合成法将稀土元素钇(Y)掺杂到无定形的碳载体中修饰其表面的二氧化铱(IrO_(2))颗粒。制备得到的IrO_(2)/Y_(x)C具有优异的酸性析氧反应催化活性,在10mA/cm^(2)的电流密度下所需过电位仅为270mV,低于未掺杂Y的IrO_(2)/C(300mV)以及商用IrO_(2)(310mV)。Y的掺杂强化了碳载体与其表面二氧化铱颗粒之间的金属-载体相互作用,导致了Ir活性位点周围电子密度的变化,有利于调节反应中间体的吸附,优化反应速率。这一研究成果为PEMWE中析氧过程提供了新的催化剂设计思路,有望推动PEMWE技术在清洁能源领域更广泛的应用。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(IrO_(2))particles.The prepared IrO_(2)/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/cm^(2),which was lower than that of undoped IrO_(2)/C(300mV)and commercial IrO_(2)(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.

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 

分 类 号：TQ151.1[化学工程—电化学工业]