Tungsten nitride decorated CNTs as efficient hybrid supports for PtRh alloys in electrocatalytic ethanol oxidation |
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Authors: | Shibin Yin Peng Wang Jiajia Lu Ying Wen Lin Luo Julian Key Ningzhang Wang Pei Kang Shen |
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Affiliation: | 1. Guangxi Key Laboratory of Electrochemical Energy Materials, Collaborative Innovation Center of Renewable Energy Materials (CICREM), Guangxi University, Nanning 530004, China;2. State Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guangxi University, Nanning 530004, China;3. School of Computer, Electronics and Information, Guangxi University, Nanning 530004, China |
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Abstract: | Direct ethanol fuel cells (DEFCs) offer an attractive alternative to fossil fuel-powered devices due to their high energy density and environmental benignity. However, high cost and poor stability of catalysts are still the main obstacles for the commercialization of DEFCs. Herein, a novel catalyst comprising PtRh alloys anchored on carbon nanotubes that decorated with tungsten nitride (Pt9Rh-WN/CNTs) was synthesized via impregnation-reduction method and followed by thermal annealing in N2. The X-ray powder diffraction (XRD), scanning electron micrograph (SEM) and transmission electron microscopy (TEM) are employed to characterize the corresponding physico-chemical properties of the as-prepared catalysts. Electrocatalytic performance for ethanol oxidation is evaluated by cyclic voltammetry, linear scan voltammetry, CO-stripping voltammograms, chronoamperometry and chronopotentiometry. The current density on Pt9Rh-WN/CNTs is 484.8 mA mgPt?1, which is much higher than that of Pt9Rh/CNTs (305.7 mA mgPt?1) and Pt/CNTs (135.1 mA mgPt?1). Most importantly, the onset potential for CO oxidation on Pt9Rh-WN/CNTs is 0.27 V, which is more negative than that on Pt9Rh/CNTs (0.37 V) and Pt/CNTs (0.40 V). Therefore, the Pt9Rh-WN/CNTs catalyst displays both outstanding catalytic activity and excellent CO-poisoning tolerance for ethanol oxidation. Synergistic effects arising between WN and PtRh alloy along with nitrogen-doping effects of CNTs with ammonia are proposed to contribute to the outstanding performance of this catalyst in ethanol oxidation. |
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Keywords: | PtRh alloys WN/CNTs hybrid supports Catalyst Ethanol oxidation Direct ethanol fuel cells |
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