Hong, Seokjin Kim, Hyunki Han, Gyeong Ho Yoo, Jungmin Kim, Soo-Kil Jang, Jong Hyun Ahn, Sang Hyun 2024-11-30T05:30:23Z 2024-11-30T05:30:23Z 2024-11-30 2024-11 1385-8947 https://pubs.kist.re.kr/handle/201004/151203 Replacing the oxygen evolution reaction in water electrolysis with ammonia oxidation reaction enables low voltage hydrogen production. Pt is a promising catalyst for the ammonia oxidation reaction due to its superior dehydrogenation and low affinity for *N, but N-ads poisoning deactivates the Pt surface. This study proposes a method to improve ammonia oxidation performance and stability through electrochemical activation, introducing cathodic corrosion and recovery conditions. The half-cell results showed a peak current density of 74.2 mA cm(-2) and retention ratio of 17 %. Adjusting the lower and upper cell voltage in a membrane electrode assembly based single cell optimized surface cleaning and inhibits further poisoning by O/OHads above 0.75 V-cell. Furthermore, incorporation of recovery conditions can enhance the stability of poisoned electrode compared to that in chronoamperometry test. The results of pulsed ammonia electrolysis tests incorporating recovery conditions suggested a novel approach to practical hydrogen production by stabilizing catalysts with a 83 % Faradaic efficiency at 0.1 A cm(-2). English Elsevier BV Electrochemical activation of Pt electrode for efficient and stable anion exchange membrane ammonia electrolyzer Article 10.1016/j.cej.2024.157064 1 Chemical Engineering Journal, v.500 Chemical Engineering Journal 500 N scie scopus 001353696900001 2-s2.0-85206971859 Engineering, Environmental Engineering, Chemical Engineering Article OXYGEN EVOLUTION REACTION HYDROGEN-PRODUCTION OXIDATION ELECTROCATALYSTS ELECTROOXIDATION CONVERSION Cathodic corrosion Facet Ammonia oxidation reaction Poisoning Surface recovery Anion exchange membrane ammonia electrolyzer