Multifunctional Electrochemical Properties of Synthesized Non-Precious Iron Oxide Nanostructures

Abstract

Magnetic Fe3O4 nanostructures for electrochemical water splitting and supercapacitor applications were synthesized by low temperature simple wet-chemical route. The crystal structure and morphology of as-acquired nanostructures were examined by powder X-ray diffraction and transmission electron microscopy. Magnetic measurements indicate that the as-synthesized Fe3O4 nanostructures are ferromagnetic at room temperature. The synthesized nanostructures have a high-specific surface area of 268 m2/g, which affects the electrocatalytic activity of the electrode materials. The purity of the as-synthesized nanostructures was affirmed by Raman and X-ray Photoelectron studies. The electrochemical activity of the magnetic iron oxide nanoparticles (MIONPs) for the hydrogen evolution reaction (HER) and supercapacitors were investigated in alkaline medium (0.5 M KOH) versus Ag/AgCl at room temperature. The electrocatalysts show low onset potential (~0.18 V) and Tafel slope (~440 mV/dec) for HER. Additionally, the specific capacitance of MIONPs was investigated, which is to be ~135 ± 5 F/g at 5 mV/s in 1 M KOH.

Hydrothermally Derived Hierarchical CuO Nanoflowers as an Efficient Photocatalyst and Electrocatalyst for Hydrogen Evolution

“…For the development of photocatalysts, care must be taken that it has narrow bandgap for broader spectrum of solar energy absorption, physical properties (morphology, crystallinity, particle size) must be tuned for effective charge separation and migration [13,14] . With remarkable chemical and thermal stabilities and significant optoelectronic properties, various single and mixed metal oxides based nanostructures including TiO 2 , SnO 2 , Ag/SnO 2 , Cr/SnO 2 , RuO 2 , Fe 3 O 4 , In 2 O 3 , ZnWO 4 , CuWO 4 and rare earth doped metal oxides have been reported as better catalytic systems in order to generate H 2 through photo‐ and electrocatalytic systems [7,12,15–24] . As the second cheapest metal, copper provides ample prospects for catalytic applications.…”

“…[13,14] With remarkable chemical and thermal stabilities and significant optoelectronic properties, various single and mixed metal oxides based nanostructures including TiO 2 , SnO 2 , Ag/SnO 2 , Cr/SnO 2 , RuO 2 , Fe 3 O 4 , In 2 O 3 , ZnWO 4 , CuWO 4 and rare earth doped metal oxides have been reported as better catalytic systems in order to generate H 2 through photo-and electrocatalytic systems. [7,12,[15][16][17][18][19][20][21][22][23][24] As the second cheapest metal, copper provides ample prospects for catalytic applications. Copper oxide based semiconductors with valuable characteristics like non-toxicity, inexpensive and narrow band gap (1.2-2.8 eV) and more negative conduction band edge have been extensively explored as favourable material in the area of photocatalysis.…”

Boosting the Multifunctional Properties of MnCo2O4‐MnCo2S4 Heterostructure for Portable All‐Solid‐State Symmetric Supercapacitor, Methanol Oxidation and Hydrogen Evolution Reaction

“…In recent times, the multifunctional ability of transition metal‐based materials towards energy storage and energy conversion is explored and obtained huge attention worldwide. Recently developed multifunctional transition metal‐based materials for supercapacitor, methanol oxidation and hydrogen evolution reaction include P doped NiCo 2 O 4 , [13] N doped NiCo 2 O 4 , [14] NiCo 2 O 4 @MoS 2 , [15] Fe 3 O 4 , [16] Cu 2 O and CuO, [17] Fe 3 O 4 @MoS 2 /rGO, [18] 2H‐TaS 2 , [19] CoNi bimetallic organic framework, [20] NiCo‐LDH, [21] Co doped Ni 3 S 2 @CNT, [22] and Ni/Polypyrol/rGO [23] …”

Novel NiMgOH-rGO-Based Nanostructured Hybrids for Electrochemical Energy Storage Supercapacitor Applications: Effect of Reducing Agents

“…Supercapacitors have been used to store electrical energy in backup power systems, portable electronics, telecommunications, and vehicles, among other applications [4][5][6]. Practically, energy storage systems are widely demonstrated and reported for good performance and robustness [7,8]. The physicochemical properties of the electrode material are important in improving the supercapacitor's performance [9,10].…”