Electrochemical oxygen reduction on oxide catalysts

Ni and/or Co nanoparticles as catalysts for oxygen reduction reaction (ORR) at room temperature

“…However without this pretreatment, high oxidability of nickel was leading to formation of different surface compounds, significantly decreasing the reaction rate of oxygen reduction. The same author published in 1976 that oxygen reduction on NiO proceeded via a two electron pathway to hydrogen peroxide [18], which was also confirmed later by an another group [19]. The formation of hydroxide on nickel and cobalt electrodes was also reported to inhibit the oxygen reduction reaction [18].…”

“…Some of those materials have also been tested as cathodes for ORR and Co-based Spinel oxides such as Co 3 O 4 , NiCo 2 O 4 and MnCo 2 O 4 have exhibited interesting activity [18,20,21]. Manganese-substituted Co 3 O 4 seems however to be the most attracting compound for oxygen reduction [18,20].…”

Electrodeposited Ni-Sn coatings as electrocatalysts for hydrogen and oxygen evolution in alkaline solutions

“…Certain differences in the values of the Tafel slope in the lower overpotential region are probably due to differences in the structure and composition of the oxide film on Ni. It has been shown that the thermally formed Ni-oxide film exhibited much better electrocatalytic activity than the electrochemically formed oxide film [22].…”

Carbon nanocapsules as an electrocatalyst support for the oxygen reduction reaction in alkaline electrolyte

“…Many materials have been investigated as an electrocatalyst to enhance the ORR. They include metals (Pt, Ag) [4][5][6][7][8][9], metal oxides (RuO 2 , MnO 2 , CoO) [10][11][12], perovskites (LaCoO 3 , La 0.6 Ca 0.4 CoO 3 ) [13][14][15][16][17], spinels (Ni x Al 1-x Mn 2 O 4 , Ni 2 Co 2 O 4 , Mn 3x Co 3-3x O 4 ) [18][19][20], as well as pyrolyzed N-4 chelate compounds (CoTMPP) [21]. A thorough review was provided recently by Wang, discussing available non-platinum electrocatalysts [22].…”