Atomic H-Induced Mo2C Hybrid as an Active and Stable Bifunctional Electrocatalyst

作者：Fan, Xiujun^*; Liu, Yuanyue; Peng, Zhiwei; Zhang, Zhenhua; Zhou, Haiqing; Zhang, Xianming; Yakobson, Boris I.; Goddard, William A., III; Guo, Xia^*; Hauge, Robert H.; Tour, James M.^*

来源：ACS Nano, 2017, 11(1): 384-394.

DOI：10.1021/acsnano.6b06089

• Mo2C
• graphene nanoribbon
• hydrogen-evolution reaction
• oxygen-reduction reaction
• atomic H

Mo2C nanocrystals (NCs) anchored on vertically aligned graphene nanoribbons (VA-GNR) as hybrid nanoelectrocatalysts (Mo2C-GNR) are synthesized through the direct carbonization of metallic Mo with atomic H treatment. The growth mechanism of Mo2C NCs with atomic H treatment is discussed. The Mo2C-GNR hybrid exhibits highly active and durable electrocatalytic performance for the hydrogen-evolution reaction (HER) and oxygen-reduction reaction (ORR). For HER, in an acidic solution the Mo2C-GNR has an onset potential of 39 mV and a Tafel slope of 65 mV dec(-1), and in a basic solution Mo2C-GNR has an onset potential of 53 mV, and Tafel slope of 54 mV dec(-1). It is stable in both acidic and basic media. Mo2C-GNR is a high-activity ORR catalyst with a high peak current density of 2.01 mA cm(-2), an onset potential of 0.93 V that is more positive vs reversible hydrogen electrode (RHE), a high electron transfer number n (similar to 3.90), and long-term stability.

• 出版日期2017-1
• 单位山西大学; 北京工业大学; 北京邮电大学