Delivering the Full Potential of Oxygen Evolving Electrocatalyst by Conditioning Electrolytes at Near-Neutral pH
作者： Tatsuya Shinagawa , Kazuhiro Takanabe , Takeshi Nishimoto , Takahiro Naito
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摘要: This study reports on the impact of identity and compositions buffer ions oxygen evolution reaction (OER) performance at a wide range pH levels using model IrOx electrocatalyst. Rigorous microkinetic analysis employing kinetic isotope effects, Tafel analysis, temperature dependence measurement was conducted to establish rate expression isolated from diffusion contribution solution resistance. It found that OER kinetics facile with OH- oxidation compared H2 O, results which were highlighted by mitigating over 200 mV overpotential in presence reach 10 mA cm-2 . improvement ascribed involvement local supply buffering action. Further digesting data various pKa bulk disclosed trade-off between exchange current density slope, indicating optimal electrolyte condition can be chosen different density. provides quantitative guideline for engineering maximize intrinsic electrocatalyst possesses especially near-neutral pH.
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