Tuning of oxygen vacancies in Co3O4 electrocatalyst for effectiveness in urea oxidation and water splitting
學年 113
學期 1
出版（發表）日期 2025-01-29
作品名稱 Tuning of oxygen vacancies in Co3O4 electrocatalyst for effectiveness in urea oxidation and water splitting
作品名稱（其他語言）
著者 Pandian Mannu; Ranjith Kumar Dharman; Ta Thi Thuy Nga; Athibala Mariappan; Yu-Cheng Shao; Hirofumi Ishii; Yu-Cheng Huang; Asokan Kandasami; Tae Hwan Oh; Wu-Ching Chou; Chi-Liang Chen; Jeng-Lung Chen; Chung-Li Dong
單位
出版者
著錄名稱、卷期、頁數 Small 21(4), 2403744
摘要 The development of an excellent multifunctional electrocatalyst that is based on non-precious metal is critical for improving the electrochemical processes of the hydrogen evolution reaction (HER), the oxygen evolution reaction (OER), and the urea oxidation reaction (UOR) in alkaline media. This study demonstrates that incorporating Mo into Co3O4 facilitated the formation of rich oxygen vacancies (Vo), which promotes effective nitrate adsorption and activation in urea electrolysis. Subsequently, in situ/operando X-ray absorption spectroscopy is used to explore the active sites in Mo-Co3O4-3 under OER, indicating the oxygen vacancies are first filled with OH• in Mo-Co3O4; facilitated the pre-oxidation of low-valence Co, and promoted the reconstruction/deprotonation of intermediate Co-OOH•. Mo-Co3O4-3 electrocatalysts show impressive HER, OER, and UOR with low overpotentials of 141 mV, 220 mV, and 1.32 V, respectively, at 10 mA cm−2 in an alkaline medium. Furthermore, in situ/Operando Raman spectroscopy results reveal the importance of CoOOH active sites for enhanced electrochemical performance in Mo-Co3O4-3 compared to the pure Co3O4. The urea electrolyzer with Mo-Co3O4 electrocatalysts acts as an anode and the cathode delivers 1.42 V at 10 mA cm−2. A viable approach to creating effective UOR electrocatalysts involves synergistic engineering exploiting doping and oxygen vacancies.
關鍵字 oxygen evolution reaction; oxygen vacancies; urea oxidation reaction; x-ray absorption spectroscopy
語言 en
ISSN 1613-6810; 1613-6829
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 是
國別 DEU
公開徵稿
出版型式 ,電子版,紙本
相關連結

機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/129533 )