Tab. 1.

Proposed H₂O₂ reaction pathways based on literature.

Reaction and Position		Equation	References	No.
H2O2 generation (2 electron O2 reduction)	Cathode surface and inside	O2(g) + 2 H+ + 2 e− → H2O2	Bard et al., 2009[16] Oturan et al., 2014[15] Oturan et al., 2014[3]	(2)
Disproportion of H2O2*	Cathode surface and inside	2 H2O2 → O2(g) + 2 H2O	Oturan et al., 2014[3] Bard et al., 2009[16]	(3)
Cathodic reduction of H2O2	Cathode surface and inside	H2O2 + 2 H+ + 2 e− → 2 H2O	Oturan et al., 2014[3] Bard et al., 2009[16]	(4)
Anodic oxidation of H2O2	Anode surface	H2O2 → HO2· + H+ + e− HO2· → O2(g) + H+ + e−	Oturan et al., 2014[15] Oturan et al., 2014[3]	(5) (6)
Disproportion of H2O2	Bulk electrolyte	2 H2O2 → O2(g) + 2 H2O	Oturan et al., 2014[15]	(7)

Note:

^*H₂O₂ disproportion occurred at cathode surface and inside would produce O₂, which was used to generate H₂O₂ again. This process is different from disproportion take place in bulk electrolyte.