Iridium-doped ZIFs-derived porous carbon-coated IrCo alloy as competent bifunctional catalyst for overall water splitting in acid medium. (1st June 2019)

• Record Type: Journal Article
• Authors: Sun, Xuechu; Liu, Fei; Chen, Xiu; Li, Cuicui; Yu, Jun; Pan, Mu
• Is Part Of: Electrochimica acta. Volume 307(2019)
• Page Start: 206
• Page End: 213
• Publication Date: 2019-06-01
• Subjects: Bifunctional electrocatalysts -- Overall water splitting -- Polymer electrolyte membrane (PEM) -- IrCo alloy -- Porous carbon layer -- Carbon nanotubes; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2019.03.179
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Bifunctional electrocatalysts for overall water splitting in acidic media is critical for polymer electrolyte membrane (PEM) electrolysis of water. We report a synthesis of porous carbon-coated noble metal-based catalysts. We adopt simple annealing strategy involving Ir-doped zeolite imidazole skeleton to obtain IrCo alloys encapsulated by the porous carbon layers and carbon nanotubes, which is a new method for synthesizing IrCo alloy. The amount of Ir loaded in IrCo NPs catalyst is extremely low (only 6.7 wt%) and IrCo NPs exhibit excellent catalytic activity for both HER and OER in acidic environment, to achieve 10 mA cm −2 current density during HER and OER, overpotential of only 23.9 and 270 mV is required for our novel IrCo NPs catalyst. More significantly, IrCo NPs reach 10 mA cm −2 during overall water splitting at a cell voltage of only 1.55 V in 0.5 M H2 SO4 and demonstrated good durability. Thus, it has excellent prospects to be implemented into PEM for water electrolysis.