화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.79, 370-382, November, 2019
DOI10.1016/j.jiec.2019.07.013  Export Citation
Bifunctional NiCo2Se4 and CoNi2Se4 nanostructures: Efficient electrodes for battery-type supercapacitors and electrocatalysts for the oxygen evolution reaction
John Anthuvan Rajesh, Young-Hoon Lee, Yong-Han Yun, Vu Hong Vinh Quy, Soon-Hyung Kang1, Hyunsoo Kim2, and Kwang-Soon Ahn†
  • School of Chemical Engineering, Yeungnam University, Gyeongsan 712-749, South Korea
  • 1Department of Chemistry Education, Chonnam National University, Gwangju 500-757, South Korea
  • 2School of Semiconductor and Chemical Engineering, Chonbuk National University, Jeonju 561-756, South Korea
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We report the fabrication of bimetallic NiCo2Se4 and CoNi2Se4 nanostructures on nickel-foam (Ni-foam) substrates via a potentiostatic-deposition method by adjusting the molar ratio of Ni and Co metals. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses show that burl-like clusters with characteristic fluffy NiCo2Se4 and flake-like CoNi2Se4 hierarchical structures were deposited on the Ni-foam substrates. When used as battery-type electrodes in supercapacitors, both NiCo2Se4 and CoNi2Se4 electrodes exhibited outstanding capacity and good electrochemical properties. The CoNi2Se4 electrode delivered excellent capacity and cycling stability (602 C g-1 at 1 A g-1 and 98.30% retention after 5000 cycles at 40 A g-1) when compared to the NiCo2Se4 electrode (353 C g-1 at 1 A g-1 and 96.83% retention after 5000 cycles at 40 A g-1). Furthermore, as-deposited NiCo2Se4 and CoNi2Se4 hierarchical structures were employed as efficient electrocatalysts for water oxidation in alkaline solutions. NiCo2Se4 and CoNi2Se4 electrocatalysts showed low overpotentials of 257 and 244 mV in a 1.0 M KOH aqueous solution, respectively. The electrocatalysts also exhibited prolonged stability (NiCo2Se4 and CoNi2Se4 maintained currents of 95.6% and 97.5%, respectively, over 10 h), which makes them comparable to well-known Ni and Co-based catalysts. Collectively, the as-deposited NiCo2Se4 and CoNi2Se4 are the most efficient bifunctional electrodes and electrocatalysts for application in battery- type supercapacitors and the oxygen evolution reaction, respectively, and can potentially be applied for energy conversion and storage processes.
Keywords:Transition metal selenides;Battery-type electrode;Supercapacitor;Electrocatalyst;Oxygen evolution
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