Details

Autor(en) / Beteiligte

• Liu, Xiao-Jing
• Yin, Xing
• Sun, Yi-Dan
• Yu, Feng-Jiao
• Gao, Xiang-Wen
• Fu, Li-Jun
• Wu, Yu-Ping
• Chen, Yu-Hui

Titel

Interlaced Pd-Ag nanowires rich in grain boundary defects for boosting oxygen reduction electrocatalysis

Ist Teil von

• Nanoscale, 2020-03, Vol.12 (9), p.5368-5373

Ort / Verlag

England: Royal Society of Chemistry

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Given the high cost and poisoning issues of Pt, developing Pd-based catalysts as substitutes is highly essential. Although substantial progress has been made, the synthesis of Pd-based electrocatalysts with both high activity and stability in the oxygen reduction reaction (ORR) remains a challenge. In this work, we prepared Pd-Ag nanowires with up to micro-sized length and a diameter of ∼17 nm via a facile modified polyol method. The obtained Pd-Ag nanowires (NWs) exhibit interlaced features and are rich in grain boundary defects. Due to the continuous grain boundaries in the one-dimensional (1D) structure and the optimized composition, the synthesized Pd 1 Ag 1 NWs show half-wave potential of 0.897 V and mass activity of 0.103 A mg −1 in alkaline media toward ORR, higher than those of both state-of-the-art Pt/C and other Pd-Ag counterparts. Significantly, after stability tests over 5000 cycles, Pd 1 Ag 1 NWs shows a 2 mV positive shift, much better than that of Pt/C, exhibiting striking stability for ORR. This work may provide an avenue to construct advanced catalysts by surface defect engineering. Pd-Ag interlaced nanowires with grain boundary defect engineering exhibit enhanced activity and superior stability for oxygen reduction reaction in alkaline media.