| 论文标题 |
Quasi-zero-dimensional cobalt-doped CeO2 dots on Pd catalysts for alcohol electro-oxidation with enhanced poisoning-tolerance |
| 作者 |
Tan, Qiang Zhu, Haiyan Guo, Shengwu Chen, Yuanzhen Jiang, Tao Shu, Chengyong Cho |
| 发表/完成日期 |
2017-08-04 |
| 期刊名称 |
Nanoscale |
| 期卷 |
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| 相关文章 |
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| 论文简介 |
Deactivation of an anode catalyst resulting from the poisoning of COad-like intermediates is one of the major problems for methanol and ethanol electro-oxidation reactions (MOR & EOR), and remains a grand challenge towards achieving high performance for direct alcohol fuel cells (DAFCs). Herein, we report a new approach for the preparation of ultrafine cobalt-doped CeO2 dots (Co-CeO2, d = 3.6 nm), which can be an effective anti-poisoning promoter for Pd catalysts towards MOR and EOR in alkaline media. Compared to Pd/CeO2 and pure Pd, the hybrid Pd/Co-CeO2 nanocomposite catalyst exhibited a much enhanced activity and remarkable anti-poisoning ability for both MOR and EOR. The nanocomposite catalyst showed much higher mass activity (4[times]) than a state-of-the-art PtRu catalyst. The promotional mechanism was elucidated using extensive characterization and density-functional theory (DFT). A bifunctional effect of the Co-CeO2 dots was discovered to be due to (i) an enhanced electronic interaction between Co-CeO2 and Pd dots and (ii) the increased oxygen storage capacity of Co-CeO2 dots to facilitate the oxidation of COad. Therefore, the Pd/Co-CeO2 nanocomposite appears to be a promising catalyst for advanced DAFCs with low cost and high performance. |
(创新港)
