TY - JOUR
T1 - Facile synthesis of hierarchical flower-like NiMoO4-CoMoO4 nanosheet arrays on nickel foam as an efficient electrode for high rate hybrid supercapacitors
AU - Gopi, Chandu V.V.Muralee
AU - Sambasivam, Sangaraju
AU - Raghavendra, Kummara Venkata Guru
AU - Vinodh, Rajangam
AU - Obaidat, Ihab M.
AU - Kim, Hee Je
N1 - Funding Information:
This work was supported by BK 21 PLUS, Creative Human Resource Development Program for IT Convergence, Pusan National University, Busan, South Korea. Also, this work was supported by UAEU Program for Advanced Research (UPAR) under Grant no. 31S312.
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/8
Y1 - 2020/8
N2 - Binder-free hierarchical flower-like NiMoO4[sbnd]CoMoO4 nanosheet arrays (NSAs) have been successfully grown on nickel (Ni) foam surface via a facile one-step chemical bath deposition method followed by calcination treatment. The as-prepared NiMoO4[sbnd]CoMoO4 NSAs electrode material has been effectively used as a battery-type material for supercapacitor applications. Surface morphological and structural studies reveal that the as-fabricated NiMoO4[sbnd]CoMoO4 electrode exhibits a flower-like heterostructures constructed with interconnected nanosheet arrays. In a three-electrode system, the potential plateaus from the cyclic voltammetry and galvanostatic charge–discharge measurements indicate that the obtained NiMoO4[sbnd]CoMoO4 NSAs electrode exhibits Faradic battery-type redox behaviour, which is different form the profiles of carbon-based materials. As a battery-type material, NiMoO4[sbnd]CoMoO4 NSAs electrode delivers a remarkable specific capacity of (~236.86 mA h g−1 at 2 A g−1), excellent rate capability (~92.44% retains even at 10 A g−1), and superior cycling stability (~97.19% at 6 A g−1 over 5000 cycles), which are much higher than those of the bare NiMoO4 and CoMoO4 electrodes. The superior electrochemical properties of the NiMoO4[sbnd]CoMoO4 composite material are due to the synergetic effect from CoMoO4 and NiMoO4 and to the fact that the hierarchical nanosheet arrays provide abundant electroactive sites for rapid redox reactions. Additionally, hybrid supercapacitor (HSC) has been assembled using NiMoO4[sbnd]CoMoO4 NSAs/Ni foam as the positive electrode and graphene-ink/Ni foam as the negative electrode. It is found to exhibit a good cycling stability and a high specific energy of 27.58 Wh kg−1 at a specific power of 636.05 W kg−1. Thereby, these electrochemical performances suggest that the as-fabricated NiMoO4[sbnd]CoMoO4 NSAs are promising candidates for electrodes in high-performance supercapacitors.
AB - Binder-free hierarchical flower-like NiMoO4[sbnd]CoMoO4 nanosheet arrays (NSAs) have been successfully grown on nickel (Ni) foam surface via a facile one-step chemical bath deposition method followed by calcination treatment. The as-prepared NiMoO4[sbnd]CoMoO4 NSAs electrode material has been effectively used as a battery-type material for supercapacitor applications. Surface morphological and structural studies reveal that the as-fabricated NiMoO4[sbnd]CoMoO4 electrode exhibits a flower-like heterostructures constructed with interconnected nanosheet arrays. In a three-electrode system, the potential plateaus from the cyclic voltammetry and galvanostatic charge–discharge measurements indicate that the obtained NiMoO4[sbnd]CoMoO4 NSAs electrode exhibits Faradic battery-type redox behaviour, which is different form the profiles of carbon-based materials. As a battery-type material, NiMoO4[sbnd]CoMoO4 NSAs electrode delivers a remarkable specific capacity of (~236.86 mA h g−1 at 2 A g−1), excellent rate capability (~92.44% retains even at 10 A g−1), and superior cycling stability (~97.19% at 6 A g−1 over 5000 cycles), which are much higher than those of the bare NiMoO4 and CoMoO4 electrodes. The superior electrochemical properties of the NiMoO4[sbnd]CoMoO4 composite material are due to the synergetic effect from CoMoO4 and NiMoO4 and to the fact that the hierarchical nanosheet arrays provide abundant electroactive sites for rapid redox reactions. Additionally, hybrid supercapacitor (HSC) has been assembled using NiMoO4[sbnd]CoMoO4 NSAs/Ni foam as the positive electrode and graphene-ink/Ni foam as the negative electrode. It is found to exhibit a good cycling stability and a high specific energy of 27.58 Wh kg−1 at a specific power of 636.05 W kg−1. Thereby, these electrochemical performances suggest that the as-fabricated NiMoO4[sbnd]CoMoO4 NSAs are promising candidates for electrodes in high-performance supercapacitors.
KW - Chemical bath deposition
KW - Nanosheet arrays
KW - NiMoO-CoMoO
KW - Specific energy
KW - Supercapacitors
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U2 - 10.1016/j.est.2020.101550
DO - 10.1016/j.est.2020.101550
M3 - Article
AN - SCOPUS:85085529469
SN - 2352-152X
VL - 30
JO - Journal of Energy Storage
JF - Journal of Energy Storage
M1 - 101550
ER -