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 H2 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 119 mV 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.
| Original language | English |
|---|---|
| Pages (from-to) | 652-661 |
| Number of pages | 10 |
| Journal | Journal of Alloys and Compounds |
| Volume | 763 |
| DOIs | |
| Publication status | Published - 2018 Sep 30 |
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Keywords
- Carbon nanotube
- Cobalt phosphide
- Hydrogen evolution reaction
- Nanostructured materials
- Spray pyrolysis
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry
Cite this
Structure-optimized CoP-carbon nanotube composite microspheres synthesized by spray pyrolysis for hydrogen evolution reaction. / Kim, Jin Koo; Park, Seung Keun; Kang, Yun Chan.
In: Journal of Alloys and Compounds, Vol. 763, 30.09.2018, p. 652-661.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Structure-optimized CoP-carbon nanotube composite microspheres synthesized by spray pyrolysis for hydrogen evolution reaction
AU - Kim, Jin Koo
AU - Park, Seung Keun
AU - Kang, Yun Chan
PY - 2018/9/30
Y1 - 2018/9/30
N2 - 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 H2 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 119 mV 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.
AB - 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 H2 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 119 mV 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.
KW - Carbon nanotube
KW - Cobalt phosphide
KW - Hydrogen evolution reaction
KW - Nanostructured materials
KW - Spray pyrolysis
UR - http://www.scopus.com/inward/record.url?scp=85048530786&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85048530786&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2018.05.357
DO - 10.1016/j.jallcom.2018.05.357
M3 - Article
AN - SCOPUS:85048530786
VL - 763
SP - 652
EP - 661
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
ER -