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Structure-optimized CoP-carbon nanotube composite microspheres synthesized by spray pyrolysis for hydrogen evolution reaction

Authors
Kim, Jin KooPark, Seung-KeunKang, Yun Chan
Issue Date
30-9월-2018
Publisher
ELSEVIER SCIENCE SA
Keywords
Cobalt phosphide; Spray pyrolysis; Hydrogen evolution reaction; Carbon nanotube; Nanostructured materials
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v.763, pp.652 - 661
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF ALLOYS AND COMPOUNDS
Volume
763
Start Page
652
End Page
661
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/73043
DOI
10.1016/j.jallcom.2018.05.357
ISSN
0925-8388
Abstract
CoP-carbon nanotube (CNT) composite microspheres with high porosity for hydrogen evolution reaction (HER) are synthesized by facile spray pyrolysis and subsequent low-temperature phosphidation. Highly active CoP nanocrystals are successfully decorated on conductive CNT backbone microspheres. Decomposition of polystyrene nanobeads during spray pyrolysis forms macropores over the CoP-CNT composite microspheres, which facilitate electrolyte permeation and maximize the active site exposure. In addition, such morphology not only enhances the electron transfer along the microsphere, but also minimizes the polarization of H-2 gas during HER. Due to the synergistic effect between CoP nanocrystals and CNT backbone, along with the unique morphology, the CoP-CNT composite microspheres demonstrate outstanding HER performance in an acidic electrolyte with a low overpotential of 119mV at 10 mA cm(-2) and a small Tafel slope of 64 mV dec(-1). Moreover, the catalyst maintains its excellent catalytic activity over 2000 cycles. This study marks the versatility of the spray pyrolysis process for the synthesis of conductive substrate-supported electrocatalysts with a wide variety of materials and structures. (C) 2018 Elsevier B.V. All rights reserved.
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