期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 607, 期 -, 页码 1411-1423出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.09.060
关键词
Pt-Co alloy; Pt-Ni alloy; Oxygen reduction; Methanol oxidation
资金
- Guangxi Science and Technology Project [AA17204083, AB16380030]
- National Natural Science Foundation of China
- National Natural Science Foundation of Fujian Province [U1705252]
- European Union
- Greek National funds through the Operational Program Competitiveness, Entrepreneurship and Innovation, under the call RESEARCH - CREATE - INNOVATE [T1EDK02442]
A facile approach was introduced to synthesize Pt-M (M = Ni, Co) catalysts with a unique nanoflower structure for boosting ORR and MOR. By controlling surface-active agents and reaction time, two different types of nanodendritic structures were prepared, showing excellent catalytic performance in fuel cell electrocatalysis.
Herein, we introduce a facile approach to synthesize a unique class of Pt-M (M = Ni, Co) catalysts with a nanoflower structure for boosting both oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR). By controlling the surface-active agents, we modified the functional groups surrounding the Pt atoms, tuned the alloying of Pt and the transition metals Ni and Co, and prepared two different kinds of nanodendrites. Their successful synthesis depends on the selection and amount of surfactants (hexadecyltrimethylammonium bromide (CTAB), Polyvinylpyrrolidone (PVP)). Besides, by controlling reaction time, we also explored the forming procedures for Pt-Co globularia nanodendrite (Pt-Co GND) and Pt-Ni petalody nanodendrite (Pt-Ni PND). Our investigation highlights the importance of complex nanoarchitecture, which enables surface and interface modification to achieve excellent catalytic performance in fuel cell electrocatalysis. The characterization of the as-prepared catalysts reveals a high electrochemical surface area and mass activity (2041 mAmg(Pt)(-1) and 950 mAmg(Pt)(-1) for Pt-Co GND and Pt-Ni PND, respectively, for ORR). Furthermore, Pt-Co GND showed a high MOR activity, with a mass activity value recorded at 1615 mAmg(Pt)(-1) which is far superior to that for Pt/C. Moreover, both catalysts retain high activity after accelerated durability tests (ADTs). The electron transfer number was calculated by performing the rotating ring-disk electrode (RRDE) measurements. Due to abundant active sites of Pt, both Pt-Co GND and Pt-Ni PND exhibit a 4e(-) pathway for ORR with electron transfer number of >3.95. (C) 2021 Elsevier Inc. All rights reserved.
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