Hydrogen evolution reaction on spheroidal graphite cast iron with different pearlite areas in sulphuric acid solutions

Abstract

The rate equation of hydrogen evolution reaction of spheroidal graphite cast iron with different pearlite area has been studied in sulphuric acid solutions at 298 K. The cathodic Tafel slope of 20?130 V/decade and the reaction order with respect to the activity of hydrogen ion of 1 are obtained by linear potential sweep technique. The rate equation of hydrogen evolution reaction does not depend on the area of pearlite. There is no difference in hydrogen evolution reaction mechanisms between pure iron and spheroidal graphite cast iron.

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“…Therefore, sufficient energy is required to drive the progress of the reduction reaction. Compared with the hydrogen evolution reaction (HER) 9–11 or the oxygen evolution reaction (OER), 12–14 the CO 2 RR itself is much more complex, because multiple electron and proton coupling steps typically involve several different reaction pathways, leading to many possible by-products. 15,16 In addition, most of the materials currently studied as catalysts for CO 2 reduction require a very high overpotential and they are usually also active for the HER, leading to low turnover frequencies (TOFs) of carbon dioxide reduction products at moderate overpotentials.…”