A Heterostructure Coupling of Exfoliated Ni–Fe Hydroxide Nanosheet and Defective Graphene as a Bifunctional Electrocatalyst for Overall Water Splitting
Article
Article Title | A Heterostructure Coupling of Exfoliated Ni–Fe Hydroxide Nanosheet and Defective Graphene as a Bifunctional Electrocatalyst for Overall Water Splitting |
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ERA Journal ID | 4865 |
Article Category | Article |
Authors | Jia, Yi (Author), Zhang, Longzhou (Author), Gao, Guoping (Author), Chen, Hua (Author), Wang, Bei (Author), Zhou, Jizhi (Author), Soo, Mun Teng (Author), Hong, Min (Author), Yan, Xuecheng (Author), Qian, Guangren (Author), Zou, Jin (Author), Du, Aijun (Author) and Yao, Xiangdong (Author) |
Journal Title | Advanced Materials |
Journal Citation | 29 (17), pp. 1-8 |
Article Number | 1700017 |
Number of Pages | 8 |
Year | 2017 |
Publisher | John Wiley & Sons |
Place of Publication | Germany |
ISSN | 0935-9648 |
1521-4095 | |
Digital Object Identifier (DOI) | https://doi.org/10.1002/adma.201700017 |
Web Address (URL) | https://onlinelibrary.wiley.com/doi/full/10.1002/adma.201700017 |
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. |
Keywords | defects; graphene; heteroassembly; layered double hydroxide; nonprecious electrocatalysts |
ANZSRC Field of Research 2020 | 401605. Functional materials |
400403. Chemical engineering design | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Griffith University |
Queensland University of Technology | |
Shanghai University, China | |
University of Queensland | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q7682/a-heterostructure-coupling-of-exfoliated-ni-fe-hydroxide-nanosheet-and-defective-graphene-as-a-bifunctional-electrocatalyst-for-overall-water-splitting
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