Simple synthetic route to manganese-containing nanowires with the spinel crystal structure

Abstract

a b s t r a c tThis report describes a new route to synthesize single-crystalline manganese-containing spinel nanowires (NWs) by a two-step hydrothermal and solid-state synthesis. Interestingly, a nanowire or nanorod morphology is maintained during conversion from MnO 2 /MnOOH to CuMn 2 O 4 /Mg 2 MnO 4 , despite the massive structural rearrangement this must involve. Linear sweep voltammetry (LSV) curves of the products give preliminary demonstration that CuMn 2 O 4 NWs are catalytically active towards the oxygen evolution reaction (OER) in alkaline solution, exhibiting five times the magnitude of current density found with pure carbon black.

Spinels: Controlled Preparation, Oxygen Reduction/Evolution Reaction Application, and Beyond

“…Spinels with 1D structures, including nanorods, nanowires, and nanoarrays, have been controlled with the hydrothermal method (Figure c,d). ,, NiCo 2 S 4 nanorods were prepared with Ni­(OAc) 2 ·4H 2 O as the Ni source, Co­(OAc) 2 ·4H 2 O as the Co source, and thiourea as the S source. The solvent was water/ethylene glycol, and the temperature was 160 °C .…”

Synthesis, Electronic Structure, and Electrochemical Properties of the Cubic Mg2MnO4 Spinel with Porous-Spongy Structure

“…Studies showed that spinels containing a higher content of tetravalent manganese were beneficial to ion migration and could be used as excellent materials for electrochemical cells or rechargeable batteries [ 3 , 12 ]. The Mg 2 MnO 4 spinel has a cubic structure, and it has proven to be a good oxygen evolution photoanode [ 13 , 14 ]. Mg 2 MnO 4 is considered an inverse spinel structure; half of the magnesium ions are located in the tetrahedral site, and half of the magnesium ions and manganese ions are located in the octahedral site together [ 15 ].…”

Durable oxygen evolution reaction of one dimensional spinel CoFe2O4 nanofibers fabricated by electrospinning

“…23 Co 3 O 4 , 24 NiCo 2 O 4 , 11,24,25 and CuMn 2 O 4 (ref. 26) have been demonstrated as a group of efficient electrocatalysts for OER. Among different spinels, ferrite represents one of the most intriguing composite oxides due to their high abundance, high coercivity, moderate saturation magnetization, low-cost, low toxicity, good mechanical hardness, and rich redox chemistry.…”

“…Owing to their earth abundant nature, environmental benignity, and distinctive electrocatalytic activity for OER, spinel oxides have been discovered as good OER catalyst candidates. 23 Co 3 O 4 , 24 NiCo 2 O 4 , 11,24,25 and CuMn 2 O 4 ( ref. 26 ) have been demonstrated as a group of efficient electrocatalysts for OER.…”