Unique Sandwiched Carbon Sheets@Ni–Mn Nanoparticles for Enhanced Oxygen Evolution Reaction

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• 作者：Yan Zhang ; Huijuan Zhang ; Jiao Yang ; Yuanjuan Bai ; Huajun Qiu ; Yu Wang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：May 11, 2016
• 年：2016
• 卷：8
• 期：18
• 页码：11396-11402
• 全文大小：478K
• 年卷期：0
• ISSN：1944-8252

文摘

A unique sandwich-like architecture, where Ni–Mn nanoparticles are enveloped in coupled carbon sheets (CS@Ni–Mn), has been successfully fabricated. In the synthesis process, a great quantity of uniform NiMnO₃ nanosheets generated by a universal hydrothermal method acts as precursors and templates and the cheap, environmentally friendly and recyclable glucose functions as a green carbon source. Via subsequent hydrothermal reaction and thermal annealing, sandwiched nanocomposites with Ni–Mn nanoparticles embedded inside and carbon sheets encapsulating outside can be massively prepared. The novel sandwich-like CS@Ni–Mn possesses numerous advantages, such as an intrinsic porous feature, large specific surface area, and enhanced electronic conductivity. Moreover, as a promising NiMn-based oxygen evolution reaction (OER) catalyst, the special sandwiched nanostructure demonstrates improved electrochemical properties in 1 M KOH, including a low overpotential of about 250 mV, a modest Tafel slope of 40 mV dec^–1, excellent stability over 2000 cycles, and durability for 40 h.