Journal
ADVANCED ENERGY MATERIALS
Volume 9, Issue 24, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201900881
Keywords
layered double hydroxide; multivacancies; porous monolayer nanosheets
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Funding
- National Key Projects for Fundamental Research and Development of China [2018YFB1502002, 2017YFA0206904, 2017YFA0206900, 2016YFB0600901]
- National Natural Science Foundation of China [51825205, 51772305, 51572270, U1662118, 21871279, 21802154, 31671489]
- Beijing Natural Science Foundation [2191002, 2182078, 2194089]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB17000000]
- Royal Society-Newton Advanced Fellowship [NA170422]
- International Partnership Program of Chinese Academy of Sciences [GJHZ1819, GJHZ201974]
- Beijing Municipal Science and Technology Project [Z181100005118007]
- K.C. Wong Education Foundation
- Young Elite Scientist Sponsorship Program by CAST (YESS)
- Youth Innovation Promotion Association of the CAS
- Energy Education Trust of New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology
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In this work, porous monolayer nickel-iron layered double hydroxide (PM-LDH) nanosheets with a lateral size of approximate to 30 nm and a thickness of approximate to 0.8 nm are successfully synthesized by a facile one-step strategy. Briefly, an aqueous solution containing Ni2+ and Fe3+ is added dropwise to an aqueous formamide solution at 80 degrees C and pH 10, with the PM-LDH product formed within only 10 min. This fast synthetic strategy introduces an abundance of pores in the monolayer NiFe-LDH nanosheets, resulting in PM-LDH containing high concentration of oxygen and cation vacancies, as is confirmed by extended X-ray absorption fine structure and electron spin resonance measurements. The oxygen and cation vacancies in PM-LDH act synergistically to increase the electropositivity of the LDH nanosheets, while also enhancing H2O adsorption and bonding strength of the OH* intermediate formed during water electrooxidation, endowing PM-LDH with outstanding performance for the oxygen evolution reaction (OER). PM-LDH offers a very low overpotential (230 mV) for OER at a current density of 10 mA cm(-2), with a Tafel slope of only 47 mV dec(-1), representing one of the best OER performance yet reported for a NiFe-LDH system. The results encourage the wider utilization of porous monolayer LDH nanosheets in electrocatalysis, catalysis, and solar cells.
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