Universal Strategy to Fabricate a Two-Dimensional Layered Mesoporous Mo2C Electrocatalyst Hybridized on Graphene Sheets with High Activity and Durability for Hydrogen Generation

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• 作者：Lili Huo ; Baocang Liu ; Geng Zhang ; Jun Zhang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：July 20, 2016
• 年：2016
• 卷：8
• 期：28
• 页码：18107-18118
• 全文大小：957K
• 年卷期：0
• ISSN：1944-8252

文摘

A universal strategy was developed for fabrication of a highly active and durable precious-metal-free mesoporous Mo₂C/graphene (m-Mo₂C/G) electrocatalyst with a two-dimensional layered structural feature via a nanocasting method using glucose as a carbon source and an in-stiu assembled mesoporous KIT-6/graphene (KIT-6/G) as a template. The m-Mo₂C/G catalyst exhibits high catalytic activity and excellent durability for hydrogen evolution reaction (HER) over a wide pH range, which displays a small onset potential of 8 mV, owerpotential (η₁₀) for driving a cathodic current density of 10 mA·cm^–2 of 135 mV, a Tafel slope of 58 mV·dec^–1, and an exchange current density of 6.31 × 10^–2 mA·cm^–2 in acidic media and an onset potential of of 41 mV, η₁₀ of 128 mV, Tafel slope of 56 mV·dec^–1, and an exchange current density of 4.09 × 10^–2 mA·cm^–2 in alkaline media, respectively. Furthermore, such an m-Mo₂C/G electrocatalyst also gives about 100% Faradaic yield and shows excellent durability during 3000 cycles of a long-term test, and the catalytic current remains stable over 20 h at fixed overpotentials, making it a great potential application prospect for energy issues.