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
N1 - Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science, ICT, and Future Planning, South Korea (NRF-2016M3A7B4909318).
Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2018/11/26
Y1 - 2018/11/26
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
U2 - 10.1002/aenm.201802319
DO - 10.1002/aenm.201802319
M3 - Article
AN - SCOPUS:85054524606
VL - 8
JO - Advanced Energy Materials
JF - Advanced Energy Materials
SN - 1614-6832
IS - 33
M1 - 1802319
ER -
