Journal
NANO ENERGY
Volume 39, Issue -, Pages 30-43Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2017.06.027
Keywords
Water splitting; Oxygen evolution; Hydrogen evolution; Overpotential; NiFe layered double hydroxide; Pt Nanoparticle
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Funding
- CSIR, New Delhi
- UGC, India
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Formation of NiFe layered double hydroxide (LDH) with Pt NPs was achieved following a two-step reaction viz., the hydrothermal preparation of highly crystalline NiFe LDH sheets and the homogenous reduction of Pt4+ ions with borohydride in a solution of homogenized NiFe LDH crystalline sheets. Chemically equivalent NiFe LDH material decorated with Pt NPs was prepared by co-precipitation for comparative studies. The synthesized catalysts were systematically screened for oxygen and hydrogen evolution reactions (OER and HER) in 1 M KOH. The intentional incorporation of Pt NPs on the LDH layers reduced the cell voltage and delivered high current densities with a lower loading of 0.205 mg cm(-2). The NiFe LDH crystalline sheets had shown significantly enhanced activity, good stability, lower overpotential (90 mV) at 10 mA cm(-2) and lower Tafel slope (12 mV dec(-1)) than the co-precipitated NiFe LDH in OER. Similarly, Pt NPs tethered NiFe LDH crystalline sheets showed better activity by having lower overpotential (27 mV) and Tafel slope (51 mV dec(-1)) than the co-precipitated NiFe LDH with Pt NPs. Moreover, the state-of-the-art catalysts viz., IrO2 and Pt/C 20 wt% of OER and HER failed in competing with Pt NPs tethered NiFe LDH crystalline sheets.
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