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Lanthanide metal-assisted synthesis of rhombic dodecahedral MNi (M = Ir and Pt) nanoframes toward efficient oxygen evolution catalysis

Author(s)
Jin, HaneulHong, YongjuYoon, JisunOh, AramChaudhari, Nitin K.Baik, HionsuckJoo, Sang HoonLee, Kwangyeol
Issued Date
2017-12
DOI
10.1016/j.nanoen.2017.10.033
URI
https://scholarworks.unist.ac.kr/handle/201301/23023
Fulltext
http://www.sciencedirect.com/science/article/pii/S2211285517306377
Citation
NANO ENERGY, v.42, pp.17 - 25
Abstract
Mixed metal alloy nanoframeworks have shown a great promise as electrocatalysts in water electrolyzers and fuel cells. Although a limited number of mixed metal alloy nanoframeworks have been synthesized through phase segregation of alloy phases and removal of a component, there remains a strong need for a straightforward and facile synthesis route to this important nanostructure. A wide avenue for nanoframework structures can be opened with a fail-proof method for edge-coating shape-controlled template nanoparticles. Herein, we demonstrate that lanthanide metal chlorides can selectively passivate facets of a Ni nanotemplate, leaving the edges for the growth of a secondary metal (M = Ir, Pt). The edge-deposited metal can be further in situ mixed with the underlying Ni phase to afford rhombic dodecahedral nanoframes of binary alloy phases, namely, IrNi (IrNi-RF) and PtNi (PtNi-RF). IrNi-RF showed excellent electrocatalytic activity for the oxygen evolution reaction (OER) in an acidic electrolyte, requiring and overpotential of only 313.6 mV at 10 mA cm(-2). Furthermore, even after 5000 potential cycles in the OER, IrNi-RF underwent little performance loss with an overpotential of 329.3 mV at 10 mA cm(-2), demonstrating excellent catalytic stability. The presence of highly active grain boundaries, agglomeration-free frame structures, as well as the presence of IrNi/IrOx interface might be responsible for the excellent electrocatalytic activity and stability.
Publisher
Elsevier BV
ISSN
2211-2855
Keyword (Author)
Water electrolyzerIridiumCatalysisNanoframeGrain boundary
Keyword
GOLD NANOFRAMESBIMETALLIC NANOPARTICLESOPTICAL-PROPERTIESPHASE SEGREGATIONCUBIC NANOFRAMESNANOCRYSTALSNIELECTROCATALYSTSDURABILITYNANOCAGES

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