TY - JOUR
T1 - Petal-like hierarchical array of ultrathin Ni(OH)2 nanosheets decorated with Ni(OH)2 nanoburls
T2 - A highly efficient OER electrocatalyst
AU - Anantharaj, S.
AU - Karthik, P. E.
AU - Kundu, Subrata
N1 - Publisher Copyright:
© 2017 The Royal Society of Chemistry.
PY - 2017
Y1 - 2017
N2 - Electrocatalytic water splitting by non-noble-metal-based catalysts is the focus of attention in energy conversion technology. Group VIII 3d metals and their compounds are the often chosen catalysts for the same. Herein, we have demonstrated an easy way to synthesize one such efficient catalyst from β-Ni(OH)2, which has a petal-like morphology as a result of the formation of a 3D hierarchical array of interwoven ultra-thin β-Ni(OH)2 nanosheets decorated with β-Ni(OH)2 nanoburls. The electrocatalytic activity in the oxygen evolution reaction (OER) of the hierarchical array of ultra-thin β-Ni(OH)2 nanosheets decorated with β-Ni(OH)2 nanoburls displayed an unusual enhancement as a consequence of surface faceting of diffraction planes from (001) to (101) and (111) in addition to the formation of oxyhydroxide upon potential cycling. The solvothermally synthesized petal-like 3D hierarchical array of β-Ni(OH)2 nanosheets and nanoburls activated by faceting and the formation of oxyhydroxide exhibited a lower overpotential (η = 0.300 ± 0.003 V @ j = 10 mA cm-2), a minimum Tafel slope (0.043 V dec-1), and very high turnover frequency (TOF = 47.14 s-1 @ 1.53 V vs. RHE) with very high faradaic efficiency when compared to earlier studies on Ni(OH)2. Regardless of the type of polymorph, our catalyst have performed better than the state-of-the-art RuO2 catalyst under the same experimental conditions.
AB - Electrocatalytic water splitting by non-noble-metal-based catalysts is the focus of attention in energy conversion technology. Group VIII 3d metals and their compounds are the often chosen catalysts for the same. Herein, we have demonstrated an easy way to synthesize one such efficient catalyst from β-Ni(OH)2, which has a petal-like morphology as a result of the formation of a 3D hierarchical array of interwoven ultra-thin β-Ni(OH)2 nanosheets decorated with β-Ni(OH)2 nanoburls. The electrocatalytic activity in the oxygen evolution reaction (OER) of the hierarchical array of ultra-thin β-Ni(OH)2 nanosheets decorated with β-Ni(OH)2 nanoburls displayed an unusual enhancement as a consequence of surface faceting of diffraction planes from (001) to (101) and (111) in addition to the formation of oxyhydroxide upon potential cycling. The solvothermally synthesized petal-like 3D hierarchical array of β-Ni(OH)2 nanosheets and nanoburls activated by faceting and the formation of oxyhydroxide exhibited a lower overpotential (η = 0.300 ± 0.003 V @ j = 10 mA cm-2), a minimum Tafel slope (0.043 V dec-1), and very high turnover frequency (TOF = 47.14 s-1 @ 1.53 V vs. RHE) with very high faradaic efficiency when compared to earlier studies on Ni(OH)2. Regardless of the type of polymorph, our catalyst have performed better than the state-of-the-art RuO2 catalyst under the same experimental conditions.
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U2 - 10.1039/c6cy02282k
DO - 10.1039/c6cy02282k
M3 - Article
AN - SCOPUS:85020243642
SN - 2044-4753
VL - 7
SP - 882
EP - 893
JO - Catalysis Science and Technology
JF - Catalysis Science and Technology
IS - 4
ER -
