کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7995065 | 1516162 | 2018 | 24 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Au nanoparticle-decorated NiCo2O4 nanoflower with enhanced electrocatalytic activity toward methanol oxidation
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
The performance of direct methanol fuel cells hinges on the activity of the catalyst. To enhance the electro-catalytic activity, a flower-like nanostructure assembled from thin Au/NiCo2O4 nanosheet is synthesized via a microwave process combined with deposition-reduction method, where the Au nanoparticles are well dispersed on the surface of the NiCo2O4 nanosheet. The Au/NiCo2O4 composite nanoflower is successfully applied in the electro-catalytic oxidation of methanol and its electro-catalytic performance is investigated by cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy, which exhibits excellent electro-catalytic qualities towards methanol electro-oxidation in alkaline medium, including low onset potential (0.31Â V), high current densities (135.9Â mAÂ cmâ2) at 0.60Â V (vs. SCE), and desirable electro-oxidation stability (94%) after 500 cycles. The activity of NiCo2O4 is significantly enhanced by a small amount of Au for methanol electro-oxidation. Au, a highly electronegative metal, acted as an electron adsorbate, stimulates the generation and stabilization of Co4+ and Ni3+ cations as the active centers for methanol oxidation reactions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 732, 25 January 2018, Pages 460-469
Journal: Journal of Alloys and Compounds - Volume 732, 25 January 2018, Pages 460-469
نویسندگان
Haixing Gao, Yang Cao, Yong Chen, Xiaoyong Lai, Shujiang Ding, Jinchun Tu, Junlei Qi,