Stainless Steel Felt as a Combined OER Electrocatalyst/Porous Transport Layer for Investigating Anion-Exchange Membranes in Water Electrolysis

Autor(es)

Chen, Binyu ; Biancolli, Ana Laura G. ; Radford, Chase L. ; Holdcroft, Steven

• Tipo de documento: Artigo Científico
• Fonte: ACS ENERGY LETTERS; v. 8, n. 6, p. 7-pg., 2023-05-22.

Resumo

Anion-exchange membrane water electrolysis(AEMWE) isa promisingtechnology for low-cost, high-efficiency, green hydrogen production.The stability of the AEM is a critical issue but difficult to delineate in situ from degradation of the catalyst layer (CL). Moreover,the porous transport layer (PTL) can contribute electrocatalytically.Herein, we demonstrate that stainless steel (SS) felt, in the absenceof an anode CL, is highly active toward the oxygen evolution reaction(OER) (1 A cm(-2) at 1.74 V-cell) and servesas a combined OER electrocatalyst and PTL, thus simplifying the studyof AEMs in water electrolyzers. We further show that Ni felt exhibitsmuch lower OER activity than SS felt, which suggests that in situ studies of OER electrocatalysts and CL compositionsshould be performed with Ni felt, not SS felt, to reduce OER contributionsfrom the PTL. Lastly, we found that the substrate for depositing thecathode CL, AEM, or PTL strongly influences the rate of H-2 crossover. (AU)

• Processo FAPESP: 21/14786-2 - Membranas de troca aniônica altamente estáveis: síntese e aplicações eletroquímicas
• Beneficiário: Ana Laura Gonçalves Biancolli
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 19/26955-3 - Síntese de membranas e ionômeros de troca aniônica para aplicação em dispositivos de conversão eletroquímica
• Beneficiário: Ana Laura Gonçalves Biancolli
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado