A heterostructure coupling of exfoliated Ni-Fe hydroxide nanosheet and defective graphene as a bifunctional electrocatalyst for overall water splitting

Jia, Yi, Zhang, Longzhou, Gao, Guoping, Chen, Hua, Wang, Bei, Zhou, Jizhi, Soo, Mun Teng, Hong, Min, Yan, Xuecheng, Qian, Guangren, Zou, Jin, Du, Aijun and Yao, Xiangdong (2017) A heterostructure coupling of exfoliated Ni-Fe hydroxide nanosheet and defective graphene as a bifunctional electrocatalyst for overall water splitting. Advanced Materials, 29 17: . doi:10.1002/adma.201700017


Author Jia, Yi
Zhang, Longzhou
Gao, Guoping
Chen, Hua
Wang, Bei
Zhou, Jizhi
Soo, Mun Teng
Hong, Min
Yan, Xuecheng
Qian, Guangren
Zou, Jin
Du, Aijun
Yao, Xiangdong
Title A heterostructure coupling of exfoliated Ni-Fe hydroxide nanosheet and defective graphene as a bifunctional electrocatalyst for overall water splitting
Journal name Advanced Materials   Check publisher's open access policy
ISSN 1521-4095
0935-9648
Publication date 2017-03-03
Sub-type Article (original research)
DOI 10.1002/adma.201700017
Open Access Status Not yet assessed
Volume 29
Issue 17
Total pages 8
Place of publication Weinheim, Germany
Publisher Wiley - V C H Verlag GmbH & Co. KGaA
Collection year 2018
Language eng
Formatted abstract
Herein, the authors demonstrate a heterostructured NiFe LDH-NS@DG10 hybrid catalyst by coupling of exfoliated Ni-Fe layered double hydroxide (LDH) nanosheet (NS) and defective graphene (DG). The catalyst has exhibited extremely high electrocatalytic activity for oxygen evolution reaction (OER) in an alkaline solution with an overpotential of 0.21 V at a current density of 10 mA cm-2, which is comparable to the current record (≈0.20 V in Fe-Co-Ni metal-oxide-film system) and superior to all other non-noble metal catalysts. Also, it possesses outstanding kinetics (Tafel slope of 52 mV dec-1) for the reaction. Interestingly, the NiFe LDH-NS@DG10 hybrid has also exhibited the high hydrogen evolution reaction (HER) performance in an alkaline solution (with an overpotential of 115 mV by 2 mg cm-2 loading at a current density of 20 mA cm-2) in contrast to barely HER activity for NiFe LDH-NS itself. As a result, the bifunctional catalyst the authors developed can achieve a current density of 20 mA cm-2 by a voltage of only 1.5 V, which is also a record for the overall water splitting. Density functional theory calculation reveals that the synergetic effects of highly exposed 3d transition metal atoms and carbon defects are essential for the bifunctional activity for OER and HER.
Keyword Defects
Graphene
Heteroassembly
Layered double hydroxide
Nonprecious electrocatalysts
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
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