Development of shape-engineered α-MnO 2 materials as bi-functional catalysts for oxygen evolution reaction and oxygen reduction reaction in alkaline medium

Computational Screening of Doped α‐MnO2 Catalysts for the Oxygen Evolution Reaction

“…The choice of manganese is further supported by its nontoxicity,a bundance,r ich and versatile redox chemistry,a nd the ability to form mixed oxidesw ithd ifferent manga-nese valences. [23][24][25] Furthermore, because it is also catalytically active for the reverseo xygen reduction reaction (ORR), [14,23,[25][26][27][28][29][30][31] it is regarded as one of the most promising bifunctional catalysts for use in secondary metal-airb atteries and reversible alkaline fuel(electrolyzer) cells. [16] In neutrala nd alkali solutions, Mn undergoes ac hange from Mn 2 + in Mn 3 O 4 ,o ver Mn 3 + in Mn 2 O 3 ,t oM n 4 + in MnO 2 in the potentialr ange from 0t oa pproximately 1.0 Vv ersus the reversible hydrogen electrode (RHE),w hich is the electrode scale used herein for referencing potentials.…”

“…[21,22] Among the different polymorphs, a-MnO 2 is ostensibly the most active for the OER. [23][24][25] Furthermore, because it is also catalytically active for the reverseo xygen reduction reaction (ORR), [14,23,[25][26][27][28][29][30][31] it is regarded as one of the most promising bifunctional catalysts for use in secondary metal-airb atteries and reversible alkaline fuel(electrolyzer) cells. What distinguishes a-MnO 2 from the other MnO 2 polymorphs are the large voids (2 2tunnels) enclosed by edge-and corner-shared MnO 6 octahedra.…”

2D and 3D Silica‐Template‐Derived MnO2 Electrocatalysts towards Enhanced Oxygen Evolution and Oxygen Reduction Activity

“…In the recent years, many studies have been focused on the development of bifunctional electrodes based on non‐precious materials like metal oxides, carbon supported materials and hybrid materials, by adapting different structural modifications . Among the oxides materials, manganese oxide create a center of attention more due to the merits of natural abundance, low toxicity, structural diversity and multi valance nature . It has the potential to impact in various fields like catalysis,, supercapacitors,, and metal‐air batteries, etc.…”

Optimization of manganese oxide amount on Vulcan XC-72R carbon black as a promising support of Ni nanoparticles for methanol electro-oxidation reaction

“…Raj et al [43] have studied the electrocatalytic activity of electrolytic manganese dioxide, dispersed with silver and lanthanum through a thermal route in selected nonstoichiometric compositions, towards oxygen evolution reaction in KOH solution. It was found that a-MnO 2 nanowires possessed an enhanced electrocatalytic performance when compared to nanotubes and nanoparticles [44].…”