Cerium(III) Complex Modified Gold Electrode: An Efficient Electrocatalyst for the Oxygen Evolution Reaction

详细信息    查看全文

• 作者：Samiran Garain ; Koushik Barman ; Tridib Kumar Sinha ; Sk Jasimuddin ; Jörg Haeberle ; Karsten Henkel ; Dieter Schmeisser ; Dipankar Mandal
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：August 24, 2016
• 年：2016
• 卷：8
• 期：33
• 页码：21294-21301
• 全文大小：488K
• 年卷期：0
• ISSN：1944-8252

文摘

Exploring efficient and inexpensive electrocatalysts for the oxidation of water is of great importance for various electrochemical energy storage and conversion technologies. In the present study, a new water-soluble [Ce^III(DMF) (HSO₄)₃] complex was synthesized and characterized by UV–vis, photoluminescence, and high-resolution X-ray photoelectron spectroscopy techniques. Owing to classic 5d → 4f transitions, an intense photoluminescence in the UV region was observed from the water-soluble [Ce^III(DMF) (HSO₄)₃] complex. A stacking electrode was designed where self-assembled l-cysteine monolayer modified gold was immobilized with the synthesized cerium complex and was characterized by scanning electron microscopy, electrochemical impedance spectroscopy, and cyclic voltammetry. The resulting electrode, i.e., [Ce^III(DMF) (HSO₄)₃]–l-cysteine-Au stacks shows high electrocatalytic water oxidation behavior at an overpotential of η ≈ 0.34 V under neutral pH conditions. We also demonstrated a way where the overpotential is possible to decrease upon irradiation of UV light.