Fe_(3)O_(4)的电化学重构用于高效的析氧反应  

Electrochemical reconstruction of Fe_(3)O_(4)forefficient oxygen evolution reactions

作　　者：孙正印 向俊英 叶壮 章海霞[1] SUN Zhengyin;XIANG Junying;YE Zhuang;ZHANG Haixia(Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Eduction,College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学材料科学与工程学院,新材料界面科学与工程教育部重点实验室,太原030024

出　　处：《功能材料》2024年第12期12192-12200,共9页Journal of Functional Materials

基　　金：国家自然科学基金(52271064)。

摘　　要：铁(Fe)基电催化剂的表面重构对有效的析氧反应(OER)至关重要。首先通过一步水热法在泡沫铁(IF)基底上制备了钌(Ru)、硫(S)共掺杂的四氧化三铁(Fe_(3)O_(4))纳米片组装的纳米球花,随后通过电化学方法将S浸出,促进Fe_(3)O_(4)纳米片重构为FeOOH,形成IF基底上富含氧空位(Ov)的Ru掺杂FeOOH催化剂(Ru-FeOOH-Ov/IF)。FeOOH作为OER过程中的活性相,Ru掺杂和Ov的存在可以进一步提高其本征活性,促进了水(H_(2)O)吸附和氧气(O_(2))气体释放。因此,获得的催化剂拥有优异的碱性电化学性能,在100和300 mA cm^(-2)的电流密度下分别表现出270和311 mV的低过电位,以及300 h的长期电解稳定性。Surface reconstruction of iron(Fe)based electrocatalysts is essential for efficient oxygen evolution(OER).In this paper,nano-spherules assembled by ruthenium(Ru)and sulfur(S)co-doped Ferric oxide(Fe_(3)O_(4))nanosheets were prepared on foamy iron(IF)substrate by one-step hydrothermal method,and then S was leached by electrochemical method to promote the reconstruction of Fe_(3)O_(4)nanosheets into FeOOH,forming the Ru-doped FeOOH catalysts(Ru-FeOOH-O v/IF)with oxygen-rich vacancy(O v)on the IF substrate.As the active phase in OER process,the presence of Ru doping and O v can further enhance the intrinsic activity of FeOOH itself,which promoted the adsorption of water(H_(2)O)and the release of oxygen(O_(2))gas.Therefore,the obtained catalyst had excellent alkaline electrochemical properties,showing low overpotential of 270 mV and 311 mV at current densities of 100 mA/cm^(2)and 300 mA/cm^(2),respectively,and long-term electrolytic stability of 300 h.

关 键 词：金属氧化物 电化学重构 析氧反应 氧空位 

分 类 号：TM911.41[电气工程—电力电子与电力传动]