Abstract
Developing low-cost, highly active, and stable bifunctional electrocatalysts is a challenging issue in electrochemical water electrolysis. Building on 3D architectured electrocatalysts through structural and compositional engineering is an effective strategy to enhance catalytic activities as well as stability and durability. Herein, 3D architectures of quaternary Co-Ni-S-P compounds coupled with graphene ((Co1− xNix)(S1− yPy)2/G) electrocatalysts are proposed, in which nanosheets are self-assembled to form 3D architectures with round and flat doughnut-like shapes, toward overall water splitting. Benefiting from the 3D architectures and Ni, P substitution, (Co1− xNix)(S1− yPy)2/G exhibits superior electrocatalytic activities with low overpotentials of 117 and 285 mV at 10 mA cm−2 and Tafel slopes of 85 and 105 mV dec−1 for hydrogen and oxygen evolution reactions, respectively, in alkaline media. In addition, minimal increases in overpotential are observed, even after the 10 000th voltammetric cycle and continuous chronopotentiometric testing over 50–100 h, confirming the high stability and durability of (Co1− xNix)(S1− yPy)2/G. When used as both cathode and anode, (Co1− xNix)(S1− yPy)2/G achieves excellent overall water splitting performance with a cell potential as low as 1.65 V, reaching a current density of 10 mA cm−2 with no obvious decay after 50 h, demonstrating that (Co1− xNix)(S1− yPy)2/G is an efficient bifunctional electrocatalyst for overall water splitting.
| Original language | English |
|---|---|
| Article number | 1802319 |
| Journal | Advanced Energy Materials |
| DOIs | |
| Publication status | Accepted/In press - 2018 Jan 1 |
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Keywords
- 3D architecture
- electrocatalysts
- overall water splitting
- pyrite
- substitution
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
Cite this
3D Architectures of Quaternary Co-Ni-S-P/Graphene Hybrids as Highly Active and Stable Bifunctional Electrocatalysts for Overall Water Splitting. / Song, Hee Jo; Yoon, Hyunseok; Ju, Bobae; Lee, Gwang Hee; Kim, Dong-Wan.
In: Advanced Energy Materials, 01.01.2018.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - 3D Architectures of Quaternary Co-Ni-S-P/Graphene Hybrids as Highly Active and Stable Bifunctional Electrocatalysts for Overall Water Splitting
AU - Song, Hee Jo
AU - Yoon, Hyunseok
AU - Ju, Bobae
AU - Lee, Gwang Hee
AU - Kim, Dong-Wan
PY - 2018/1/1
Y1 - 2018/1/1
N2 - Developing low-cost, highly active, and stable bifunctional electrocatalysts is a challenging issue in electrochemical water electrolysis. Building on 3D architectured electrocatalysts through structural and compositional engineering is an effective strategy to enhance catalytic activities as well as stability and durability. Herein, 3D architectures of quaternary Co-Ni-S-P compounds coupled with graphene ((Co1− xNix)(S1− yPy)2/G) electrocatalysts are proposed, in which nanosheets are self-assembled to form 3D architectures with round and flat doughnut-like shapes, toward overall water splitting. Benefiting from the 3D architectures and Ni, P substitution, (Co1− xNix)(S1− yPy)2/G exhibits superior electrocatalytic activities with low overpotentials of 117 and 285 mV at 10 mA cm−2 and Tafel slopes of 85 and 105 mV dec−1 for hydrogen and oxygen evolution reactions, respectively, in alkaline media. In addition, minimal increases in overpotential are observed, even after the 10 000th voltammetric cycle and continuous chronopotentiometric testing over 50–100 h, confirming the high stability and durability of (Co1− xNix)(S1− yPy)2/G. When used as both cathode and anode, (Co1− xNix)(S1− yPy)2/G achieves excellent overall water splitting performance with a cell potential as low as 1.65 V, reaching a current density of 10 mA cm−2 with no obvious decay after 50 h, demonstrating that (Co1− xNix)(S1− yPy)2/G is an efficient bifunctional electrocatalyst for overall water splitting.
AB - Developing low-cost, highly active, and stable bifunctional electrocatalysts is a challenging issue in electrochemical water electrolysis. Building on 3D architectured electrocatalysts through structural and compositional engineering is an effective strategy to enhance catalytic activities as well as stability and durability. Herein, 3D architectures of quaternary Co-Ni-S-P compounds coupled with graphene ((Co1− xNix)(S1− yPy)2/G) electrocatalysts are proposed, in which nanosheets are self-assembled to form 3D architectures with round and flat doughnut-like shapes, toward overall water splitting. Benefiting from the 3D architectures and Ni, P substitution, (Co1− xNix)(S1− yPy)2/G exhibits superior electrocatalytic activities with low overpotentials of 117 and 285 mV at 10 mA cm−2 and Tafel slopes of 85 and 105 mV dec−1 for hydrogen and oxygen evolution reactions, respectively, in alkaline media. In addition, minimal increases in overpotential are observed, even after the 10 000th voltammetric cycle and continuous chronopotentiometric testing over 50–100 h, confirming the high stability and durability of (Co1− xNix)(S1− yPy)2/G. When used as both cathode and anode, (Co1− xNix)(S1− yPy)2/G achieves excellent overall water splitting performance with a cell potential as low as 1.65 V, reaching a current density of 10 mA cm−2 with no obvious decay after 50 h, demonstrating that (Co1− xNix)(S1− yPy)2/G is an efficient bifunctional electrocatalyst for overall water splitting.
KW - 3D architecture
KW - electrocatalysts
KW - overall water splitting
KW - pyrite
KW - substitution
UR - http://www.scopus.com/inward/record.url?scp=85054524606&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85054524606&partnerID=8YFLogxK
U2 - 10.1002/aenm.201802319
DO - 10.1002/aenm.201802319
M3 - Article
AN - SCOPUS:85054524606
JO - Advanced Energy Materials
JF - Advanced Energy Materials
SN - 1614-6832
M1 - 1802319
ER -