Comparative evaluation of the structural and other features governing photo-electrochemical oxygen evolution by Ca/Mn oxides

Abstract

Bio-inspired calcium manganate ceramics induce higher photocurrents than MnO2 in photo-electrochemical water splitting.

Recent Advances of First d-Block Metal-Based Perovskite Oxide Electrocatalysts for Alkaline Water Splitting

“…Mn-based oxides, especially CaMn oxides, have recently gained a significant amount of interest as water oxidation catalysts due to their similarity to the natural oxygen-evolving cluster (CaMn 4 O 5 ) found in photosynthetic plant cells [104,105]. In addition, the high abundance and low cost of Mn have also helped attract interest for use as electrocatalysts.…”

Conducting-Polymer Nanocomposites as Synergistic Supports That Accelerate Electro-Catalysis: PEDOT/Nano Co3O4/rGO as a Photo Catalyst of Oxygen Production from Water

“…As such, it is important to develop techniques that maximize the performance of nano-particulate electro-catalysts, which are typically deposited as thin films on electrode surfaces. One approach that has recently been developed by our research group in this respect involves the use of conducting polymers [2] and conductive additives as supports that create synergies with the electro-catalyst to maximally accelerate the overall electrocatalytic rate [3][4][5][6][7][8][9][10].…”

“…In effect, the photo-(or)electro-catalyst is deposited in a thin film nanocomposite that contains within it very specific proportions of a uniformly dispersed conducting polymer and conductive additive. The conducting polymer provides a large number of electrical connections to the innumerable catalytic sites on the many surfaces of the catalyst nanoparticles, along the shortest possible connection pathways to the electrode, while the conductive additive decreases the resistance of those pathways and increases visible light absorbance [3][4][5][6][7][8][9][10].…”

“…This is necessary to ensure that the largest possible quantity of catalyst nanoparticles is present, yielding the highest possible catalytic activity. In this way, the competing requirements of maximum catalytic loading, and the best electrical connection to each catalytic site, along the shortest and most conductive pathway to the electrode, are simultaneously achieved [3][4][5][6][7][8][9][10].…”

Phase stability of the layered oxide, Ca2Mn3O8; probing interlayer shearing at high pressure

“…[17][18][19] White et al later characterised the magnetic behaviour of the material as antiferromagnetic from SQUID magnetometry. 20 As with delafossite materials, Ca 2 Mn 3 O 8 has been investigated for the catalytic splitting of water [21][22][23][24][25][26][27] and as a potential battery electrode. 28 However, the understanding of the structure-property relationships in Ca 2 Mn 3 O 8 has largely been limited by the low crystallinity of the as synthesised materials.…”