Details

Autor(en) / Beteiligte

• Li, Zhen-Yu
• Zhou, Jian
• Tang, Long-Shu
• Fu, Xin-Pu
• Wei, Hang
• Xue, Mei
• Zhao, Yong-Liang
• Jia, Chun-Jiang
• Li, Xue-Mei
• Chu, Hai-Bin
• Li, Yan

Titel

Hydroxyl-rich ceria hydrate nanoparticles enhancing the alcohol electrooxidation performance of Pt catalysts

Ist Teil von

• Journal of materials chemistry. A, Materials for energy and sustainability, 2018, Vol.6 (5), p.2318-2326

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The exploration of anode catalysts with high activity and stability for direct alcohol fuel cells (DAFCs) has been a big challenge for decades. Metal oxides, such as CeO 2 with oxygen vacancies, are widely investigated in the promotion of Pt-based electrocatalysts for alcohol oxidation. Hydroxyl-rich CeO 2 · x H 2 O, which is capable of affording OH groups directly for reacting with CO to re-activate the nearby metal catalyst, may surpass CeO 2 in alcohol electrooxidation reactions. Herein, small CeO 2 · x H 2 O nanoparticles with plenty of surface OH groups have been prepared by a tert -butylamine-assisted solvothermal method, and then ultrasonically mixed with Pt/CNTs (CNTs = carbon nanotubes). As a proof-of-concept experiment, the CeO 2 · x H 2 O/Pt/CNT catalyst containing the tert -butylamine-modified CeO 2 · x H 2 O nanoparticles achieves a high peak current density of 2304 mA mg −1 for methanol oxidation in the alkaline medium, which is remarkably higher than those of the calcined counterpart (CeO 2 /Pt/CNTs, 814 mA mg −1 ) and Pt/CNTs (520 mA mg −1 ). After a chronoamperometry test for 1200 s, the retained current density of CeO 2 · x H 2 O/Pt/CNTs (570 mA mg −1 ) is also much higher than those of CeO 2 /Pt/CNTs (163 mA mg −1 ) and Pt/CNTs (10 mA mg −1 ). The advantage of CeO 2 · x H 2 O nanoparticles over CeO 2 nanoparticles has been further confirmed by ethylene glycol and glycerol oxidation reactions, and they have also been found to be effective over other alcohol oxidation catalysts such as Pt/C, Pd/C and PtRu/C. Therefore, this strategy may provide an alternative for the design of anode catalysts in DAFCs with high performance and low cost.