Steel plate 10 mm 10 mm Sat.KCl salt bridge Sodium polyacrylate gel sheet + 3.5 wt% NaCl aq. (sea water) + Ni/Al-LDH with NO 2-Gel sample CE:Pt Fumed almina-Ni/Al-LDH applied polyacrylate gel WE NaCl aq. Cl-Ion exchange Ni/Al LDH Cl-NO 2-2Fe(OH) 2 + 2NO 2- 2NO + 2Fe 2 O 3 + H 2 O Polyacrylic gel 1 Article (submit to Electrochemistry)