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. Author manuscript; available in PMC: 2020 Sep 15.
Published in final edited form as: Appl Energy. 2019 May 14;250:1011–1022. doi: 10.1016/j.apenergy.2019.05.108

Fig. 5.

Fig. 5.

Electro/sulfite reaction mechanism investigated through (a,b) cyclic voltammetry, and (c) electron spin resonance assay. Conditions: (a) 0-10 mM sulfite, 100 mM Na2SO4, pH 7, 50 mV/s scan rate; (b) 10 mM sulfite, 0.1 mM EDTA, 100 mM Na2SO4, pH 7, 50 mV/s scan rate; (c) 50 mM DMPO, 1 mM sulfite, 200 mA current, 10 mM Na2SO4, pH 7. DMPO/SC3•− adduct (aH• = 16.0 G, aN = 14.7 G) showed up in electro-sulfite reaction. Note: DMPO, 5,5-dimethyl-1-pyrrolidine-N-oxide.