Abstract
Anodic Oxidation of Sulphite in Alkaline Media on Platinum Nanoparticles Modified Nickel Electrode
Highlights
Researches regarding the use of hydrogen sulphide and sodium hydrosulphide as a fuel in ion-exchange membrane fuel cells have led to the idea of using other sulphur compounds, such as those recovered in oil refineries
In the anodic domain between 0.5 0.8 V, in the absence of sulphite ions, a peak attributed to the formation of adsorbed atomic oxygen, according to the Eq(1), can be observed [9]
At higher sulphite concentrations ( 10-1 mol L-1), the peak disappears due to sulphite oxidation reaction, probably carried out directly on the electrode surface, as specified by other researchers [8,9]
Summary
Researches regarding the use of hydrogen sulphide and sodium hydrosulphide as a fuel in ion-exchange membrane fuel cells have led to the idea of using other sulphur compounds, such as those recovered in oil refineries. The interest of researchers has been focused on the use of sulphites as fuel in alkaline fuel cells, taking into account that they result as waste in SO2 removal processes from fossil fuel combustion gases [1,2]. Platinum and nickel are commonly metallic materials used to obtain catalysts for anodic reactions. It is well known that sulphur oxides (SOx) and hydrogen sulphide (H2S) are considered noxious impurities in many fuel cells. Sulphur compounds poison the anodic materials with the formation of conventional bulk metal sulphides (e.g. Ni2S3 - if anode is nickel based) [4] or can be physically absorbed into membrane decreasing its conductivity [5]. The results will be an adverse effect on performances and lifetimes of fuel cell devices
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