过电位
材料科学
析氧
亚稳态
超级电容器
电化学
电容
双功能
电流密度
分解水
价(化学)
费米能级
态密度
化学物理
纳米技术
化学工程
电极
物理化学
凝聚态物理
催化作用
化学
电子
工程类
物理
有机化学
光催化
量子力学
生物化学
作者
Satyajit Ratha,Aneeya K. Samantara,Krishna Kanta Singha,Abhijeet Sadashiv Gangan,Brahmananda Chakraborty,Bikash Kumar Jena,Chandra Sekhar Rout
标识
DOI:10.1021/acsami.6b16250
摘要
Room-temperature stabilization of metastable β-NiMoO4 is achieved through urea-assisted hydrothermal synthesis technique. Structural and morphological studies provided significant insights for the metastable phase. Furthermore, detailed electrochemical investigations showcased its activity toward energy storage and conversion, yielding intriguing results. Comparison with the stable polymorph, α-NiMoO4, has also been borne out to support the enhanced electrochemical activities of the as-obtained β-NiMoO4. A specific capacitance of ∼4188 F g-1 (at a current density of 5 A g-1) has been observed showing its exceptional faradic capacitance. We qualitatively and extensively demonstrate through the analysis of density of states (DOS) obtained from first-principles calculations that, enhanced DOS near top of the valence band and empty 4d orbital of Mo near Fermi level make β-NiMoO4 better energy storage and conversion material compared to α-NiMoO4. Likewise, from the oxygen evolution reaction experiment, it is found that the state of art current density of 10 mA cm-2 is achieved at overpotential of 300 mV, which is much lower than that of IrO2/C. First-principles calculations also confirm a lower overpotential of 350 mV for β-NiMoO4.
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