基于电极/膜界面势垒与退极化场的铁电薄膜光阴极制备及其光电化学特性

项目名称： 基于电极/膜界面势垒与退极化场的铁电薄膜光阴极制备及其光电化学特性

项目编号： No.91233109

项目类型： 重大研究计划

立项/批准年度： 2013

项目学科： 无机非金属材料学科

项目作者： 沈明荣

作者单位： 苏州大学

项目金额： 80万元

中文摘要： 以提高光电转换效率为前提，探索新材料、新机理是目前光电化学电池光电极的研究重点。无机铁电薄膜结构性能稳定，具有自发极化，其有序排列引起的退极化场贯穿整个薄膜；它与一些电极接触形成较强的势垒电场。本项目在电极/铁电薄膜/电极光电转换特性的研究工作基础上，以PZT薄膜为例，抓住三个要素：电极/膜界面势垒、铁电退极化场、膜/电解液界面金属纳米催化剂，以提高光电转换和光解水效率为出发点，探索以ITO玻璃为基底的铁电薄膜光阴极光电化学和光解水特性，为具有高光电转换效率和高稳定性光电极的研究拓展新的材料体系和实验依据。本项目的主要特点是利用电极/膜的接触势垒内建电场及自发极化引起的退极化场组成的内建电场来分离光生电子和空穴，而不是传统的膜/电解液界面势垒，此界面势垒由膜表面沉积的金属纳米催化剂来调控。这一研究思路对光电极的研究来说是一个新的尝试。

中文关键词： 光解水；光阴极；PZT；Si；

英文摘要： Currently, the research about the photoelectrodes in the photoelectrochemical cell is focusing on exploring the new materials and new mechanism with an aim to increase the photoelectric conversion efficiency. The inorganic ferroelectric films are stable, having polarization and depolarization electric field across the film due to the alignment of the polarization, and exhibiting high barrier electric field when contacting with some electrodes. Based on our previous study on the photoelectric conversion properties of the electrode/ferroelectric film/electrode, we propose in this project to investigate the photoelectrochemical and water-splitting properties of the ferroelectric film photocathode, with emphasizing on three points: 1) the electrode/film interface barrier, 2) depolarization electric field, and 3) the metal nanoparticle catalyst on the film/electrolyte interface. The purpose of this study is to develop the new materials and new experimental fact for the photoelectrodes with high photoelectric conversion and water splitting efficiency and high stability. One main characteristic of this proposal is to separate the photogenerated electron/hole pairs using the internal electric filed originated from the electrode/film barrier and the depolarization electric field, instead of the traditional film/electroly

英文关键词： photoelectrochemical water splitting；photocathode；PZT；Si；