کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6453345 1418798 2018 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Research paperHollowed structured PtNi bifunctional electrocatalyst with record low total overpotential for oxygen reduction and oxygen evolution reactions
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Research paperHollowed structured PtNi bifunctional electrocatalyst with record low total overpotential for oxygen reduction and oxygen evolution reactions
چکیده انگلیسی


- Accordingly, the highlights have been revised as followings: Hollow structured PtNi nanostructures have been successfully synthesized through a facile solution-based approach.
- PtNi/C catalyst presents a record low total overpotential towards ORR and OER.
- Small amount of Ni in PtNi nanostructures plays an essential role in controlling their catalytic properties for ORR and OER.
- PtNi/C catalyst holds the potential to be a new benchmark bifunctional electrocatalyst.

Oxygen electrocatalysis plays a critical role in numerous energy storage/conversion devices, but the sluggish kinetics of both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) has greatly restricted the broad-based applications of such devices, especially for those requiring bifunctional electrocatalysts towards both reactions (e.g., regenerative fuel cells, metal-air batteries). Herein, we demonstrate that hollow structured bimetallic PtNi/C synthesized through a facile solution-based approach can be employed as a highly active bifunctional electrocatalyst for both ORR and OER, showing a combined ORR and OER overpotential of 0.69 V, which represents a record low value for a bifunctional electrocatalyst. Rotating ring disk electrode (RRDE) technique discloses that ORR was proceeding predominantly through the desired 4-electron pathway on the PtNi/C catalyst. Moreover, the PtNi/C is also found rather stable for both ORR and OER, with small activity lost after the accelerated durability test. These data echo the importance of innovative bi-/multi-metallic nanostructures for highly efficient catalysts that depend critically on using precious metals, for application in energy storage/conversion technologies.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis B: Environmental - Volume 222, March 2018, Pages 26-34
نویسندگان
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