Iodide mediated electrolysis of acidic coke/coal suspension

Abstract

Hydrogen is among the emerging energy vectors that are being developed to replace nonrenewable hydrocarbon energy sources. The preferred method to produce hydrogen without generating greenhouse gases is the electrolysis of water using renewable energy. The reduction of energy during the water electrolysis process is a desirable goal regardless of the source of electric power. Similar to ferrous/ferric mediation, iodide can be used as a mediator in the electrolysis of an acidic suspension of coke or coal. The iodide ion is oxidized at a far lower anodic potential than the alternative oxygen evolution reaction. This reduces the cell electrolysis voltage and, consequently, reduces electricity use. The iodide consumed at the anode is continuously regenerated by chemical reaction with the coke/coal in suspension.

A solar regenerable cathodic electron acceptor for microbial fuel cells

“…This result was expected because protons do not participate in the reduction of I 3 − (Eq. (3)), and the I 3 − ion is stable over a pH range of 2.0-10.0 [28]. The above results suggest that I 3 − is a promising candidate for the cathode electron acceptor in MFCs because of its high electroreduction rate on a carbon electrode and its stability over a wide pH range (2.0-10.0).…”

Competition of Oxygen Evolution and Desulfurization for Bauxite Electrolysis

“…In general, the slurry electrolysis on the anode consists of direct and indirect oxidation reactions. − The so-called “direct oxidation” is the process during which ore in water loses electrons at the anode surface directly, while the indirect oxidation refers to that in which the ore in water is oxidized by active oxygen species (i.e., • OH radicals) generated from water electrolysis . The indirect oxidation is generally the primary reaction on the anode during the ore electrolysis. , …”

Efficient H2 Evolution Coupled with Anodic Oxidation of Iodide over Defective Carbon-Supported Single-Atom Mo-N4 Electrocatalyst

“…A smaller current density means low catalytic activity, and it will take a longer time to produce a given quantity of hydrogen, and the cost of production could be higher. 33 , 34 which can be the reason for a decay of the iodine production rate with time (Figure 4d). Triiodide formation reaction is a spontaneous chemical reaction that is not carried out on our Mo-N 4 /d-C catalyst surface and does not affect the cathodic H 2 evolution.…”

“…An important performance parameter to test the catalyst’s performance is its current density. A smaller current density means low catalytic activity, and it will take a longer time to produce a given quantity of hydrogen, and the cost of production could be higher . According to cyclic voltammetry results (Figure.…”