Sr(Ti,Ru)O_3用於電催化水解電極的析氧反應研究

Study of Oxygen Evolution Reaction of Sr(Ti,Ru)O_3 electrode materials for electrocatalysis water splitting

李丰碩(Feng-Shuo Li) ； 吳昀昇(Yun-Sheng Wu) ； 劉恒睿(Heng-Jui Liu)

《真空科技》 34卷1期 (2021/03) Pp. 19~1-19~11

摘要

由於環境與氣候的劇烈變遷，乾淨能源的運用來減少石化燃料對環境的危害已刻不容緩，其中氫能為近年來備受矚目的熱門候選之一。在生產綠色氫的方式中，電水解為最常使用的方式，然而受限於電極材料的限制，例如成本較為昂貴，且通常需要克服過電位才能促使反應發生等問題，使得電水解產氫的實際發展仍須面臨許多挑戰。因此開發具備可逆、穩定和轉化高效率的電極催化材料為即當前該領域最重要的目標。而在眾多催化材料中，釕酸鍶（SrRuO_3，SRO）材料因具有高度導電性與高催化活性在電催化水解產氧的領域上受到廣泛的重視，然而其缺點是在酸或鹼性環境下，受到與電解液交互作用後，造成結構崩解溶進電解液而導致催化失效。本研究以具有相同結構且高度耐酸鹼的鈦酸鍶為本體，利用水熱合成法製備釕摻雜之鈦酸鍶（Sr(Ti,Ru)O_3）奈米粒子。當釕摻雜的含量增加到30％時，可發現Sr(Ti,Ru)O_3比SRO展現出更小的水解過電位與較穩定的催化活性。此研究從氧化物半導體的角度出發，提供具更高效率且較低成本的電催化電極材料之設計概念。

關鍵字

釕摻雜鈦酸鍶 ； 電水解 ； 析氧反應 ； 氫能

並列摘要

Exploring alternative energies to replace conventional fossil fuels has been the present urgent issue for slowing down the environmental disruption and extreme climate change. In various alternative solutions, hydrogen energy has been one of the most potential candidates. To produce green hydrogen, electrohydrolysis is the most common way. However, its yield is still limited on the selection of electrode materials. Therefore, exploring reversible, stable, and high efficient electocatalytic materials has been the major goal in this field. Among numerous materials, SrRuO_3 (SRO) exhibits high conductivity and catalytic activity, which make it a potential candidate in the electrocatalytic field. However, the obvious disadvantage of SRO is that the ruthenium ions easily dissolve in the acid or alkaline electrolyte, resulting in catalysis failure. In this study, we aim to obtain a more stable catalytic material with high catalytic performance, based on the highly ruthenium-doped strontium titanate (Sr(Ti,Ru)O_3) nanoparticles prepared by hydrothermal synthesis. Compared to the conventional SRO catalytic electrode, Sr(Ti,Ru)O_3 nanoparticles exhibit a smaller overpotential and more stable catalytic activity for the analyses of structure and oxygen evolution reactions (OER). This study starts from the perspective of oxide semiconductors, providing an new design criterion for high efficient and low cost electrocatalytic electrode materials.

並列關鍵字

Ru-doped SrTiO_3 ； Electrohydrolysis ； oxygen revolution reaction ； hydrogen energy