NDLI: Layer-by-layer assembly of exfoliated layered double hydroxide nanosheets for enhanced electrochemical oxidation of water

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhang, Cong Zhao, Jingwen Li, Zhenhua Zhou, Lei Shao, Mingfei Wei, Min
Copyright Year	2016
Abstract	How to develop cost-effective electrocatalysts for the oxygen evolution reaction (OER) is one of the critical issues in renewable energy storage and conversion technology. Here, we report the preparation of well-ordered ultrathin film (UTF) electrodes based on layered double hydroxide nanosheets (LDH NSs) and iron porphyrin (Fe-PP) through an electrostatic layer-by-layer (LBL) technique, which show excellent OER performance. By virtue of the high catalytic activity of LDH NSs and good electron-transfer ability of Fe-PP, the resulting CoNi-LDH NS/Fe-PP UTF exhibits a remarkably low overpotential (264 mV) to attain an OER current density of 10 mA cm−2 and a substantially decreased Tafel slope of 37.6 mV dec−1, much superior to that of the IrO2 catalyst. Moreover, this method can be extended to the preparation of other UTFs based on LDHs and Fe-PP (e.g., CoMn-LDH NS/Fe-PP, CoFe-LDH NS/Fe-PP and ZnCo-LDH NS/Fe-PP) with significantly enhanced OER performance relative to pristine LDH NSs. To illustrate the advantage of these UTFs in practical water splitting, a prototype electrolyzer cell is also fabricated by using the (CoNi-LDH/Fe-PP)30 UTF as the anode and Pt wire as the cathode, which achieves the production of both oxygen and hydrogen by using a 1.5 V AA battery as the power source.
Starting Page	11516
Ending Page	11523
Page Count	8
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	4
Issue Number	29
Journal	Journal of Materials Chemistry A
DOI	10.1039/c6ta02537d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Tafel Oxygen evolution Renewable energy Layered double hydroxides Lactate dehydrogenase Porphyrin Lawrence Berkeley National Laboratory Overpotential Current density Water splitting Anode Cathode Oxygen Hydrogen AA battery
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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