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

作者：Wang Jang Jung; Liu Yu Ting; Chen I Li; Yang Yaw Wen; Yeh Tsung Kuang; Lee Chih Hao; Hu Chi Chang; Wen Ten Chin; Chen Tsan Yao^*; Lin Tsang Lang

来源：Journal of Physical Chemistry C, 2014, 118(5): 2253-2262.

DOI：10.1021/jp408012d

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-shell 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 similar to 450% (from 17.1 to 92.8 mW cm(-2) mg(-1)), 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.

• 出版日期2014-2-6
• 单位清华大学