Near-Monolayer Platinum Shell on Core–Shell Nanocatalysts for High-Performance Direct Methanol Fuel Cell

详细信息    查看全文

• 作者：Jang-Jung Wang ; Yu-Ting Liu ; I-Li Chen ; Yaw-Wen Yang ; Tsung-Kuang Yeh ; Chih Hao Lee ; Chi-Chang Hu ; Ten-Chin Wen ; Tsan-Yao Chen ; Tsang-Lang Lin
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：February 6, 2014
• 年：2014
• 卷：118
• 期：5
• 页码：2253-2262
• 全文大小：632K
• ISSN：1932-7455

文摘

We investigate the Ru_core-Pt_shell nanoparticles (NPs) with near-monolayer thick shell atoms as the electrocatalysts at anode in the direct methanol fuel cell (DMFC). The results of X-ray diffraction indicate that its crystal structure experienced a compressive strain in Pt shell region. The shell thickness of Ru_core-Pt_shell NPs was determined to be 1.5 atomic layers by small-angle X-ray scattering by using a core鈥搒hell scattering model, and the surface atomic morphology was illustrated via high-resolution transmission electron microscopy (HRTEM). Compared with the Pt NPs, the power density of DMFC with Ru_core-Pt_shell NPs was improved by 450% (from 17.1 to 92.8 mW cm^鈥? mg^鈥?), and the open-circuit voltage was improved by 0.18 V (from 0.49 to 0.67 V). Our results fulfill the development of cost-effective DMFC with outstanding performance.