Pourbaix Diagram · Nickel–Ammonia

Pourbaix Diagram with complexing agents

Nickel–Ammonia–Citrate

Manish Sharma Timilsina¹, Isaac Holmes-Gentle³, Ifan E.L. Stephens² & Anna Hankin¹

¹Chemical Engineering, Imperial College London · ²Materials, Imperial College London · ³Chemistry, University of Oxford

Concentrations

Ni total (mol/L) 0.20

NH₃ total (mol/L) 0.00

Citrate total (mol/L) 0.00

Speciation Lines

Ammine complexes Citrate complexes Ni(OH)₂(s)

Pourbaix Boundaries

R1: Ni²⁺/Ni R2: Ni(OH)₂/Ni R3: NiOOH/Ni²⁺ R4: NiOOH/Ni(OH)₂ R5: NiO₂/NiOOH R6: NiO₂/Ni²⁺ OER HER

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