TY - JOUR

T1 - A double oxalate of Ir(III) and Co(II) as a nanoalloy precursor for electrocatalytic applications

AU - Zadesenets, Andrey

AU - Zaytseva, Tatyana

AU - Filatov, Evgeniy

AU - Plyusnin, Pavel

AU - Sukhikh, Aleksandr

AU - Kozlov, Denis

AU - Kuznetsov, Aleksey

AU - Simonov, Pavel

AU - Peritskii, Nikita

AU - Korenev, Sergey

N1 - This work is supported by the Ministry of Science and Higher Education of the Russian Federation within the governmental assignment for Boreskov Institute of Catalysis (project FWUR-2024-0036) in part of electrocatalysis and by the Russian Science Foundation (RSF), project 26-13-00032 (https://rscf.ru/project/26-13-00032/) in the rest.

PY - 2026/12

Y1 - 2026/12

N2 - Most of simple oxalates of late d-elements decompose to form highly dispersed metal, and this property can be transferred to double oxalates. In this case, a bimetallic nanoalloy could be expected as a thermolysis product, which may be useful in catalytic applications. The introduction of other metals into Ir can improve the effectiveness of Ir-based catalysts and decrease the Ir loading. A novel double oxalate of Co(II) and Ir(III) crystallizes as a trinuclear [Co(H2O)2(μ-H2O)2{Ir(C2O4)2(H2O)2}2] ([CoIr]). It decomposes to nanoalloy in both reductive (H2) and inert (He) atmospheres at a relatively low temperature (300 °C). The high solubility of the precursor allowed to impregnate the metals onto electroconductive carbon black at a content of 20 wt% using the freeze-drying approach. The prepared catalyst demonstrates high activity in the oxygen electroreduction reaction in an alkaline electrolyte, 3.9 mA·cm−2, that is superior to the commercial 20 wt% Pt/C catalyst, 3.1 mA·cm−2.

AB - Most of simple oxalates of late d-elements decompose to form highly dispersed metal, and this property can be transferred to double oxalates. In this case, a bimetallic nanoalloy could be expected as a thermolysis product, which may be useful in catalytic applications. The introduction of other metals into Ir can improve the effectiveness of Ir-based catalysts and decrease the Ir loading. A novel double oxalate of Co(II) and Ir(III) crystallizes as a trinuclear [Co(H2O)2(μ-H2O)2{Ir(C2O4)2(H2O)2}2] ([CoIr]). It decomposes to nanoalloy in both reductive (H2) and inert (He) atmospheres at a relatively low temperature (300 °C). The high solubility of the precursor allowed to impregnate the metals onto electroconductive carbon black at a content of 20 wt% using the freeze-drying approach. The prepared catalyst demonstrates high activity in the oxygen electroreduction reaction in an alkaline electrolyte, 3.9 mA·cm−2, that is superior to the commercial 20 wt% Pt/C catalyst, 3.1 mA·cm−2.

KW - Alkaline ORR

KW - Bimetallic catalysts

KW - Cobalt

KW - Iridium

KW - Nanoalloy

KW - Single-source precursors

UR - https://www.scopus.com/pages/publications/105052460103

UR - https://www.mendeley.com/catalogue/26126148-8be4-36dc-86ef-a9574a8f6b21/

U2 - 10.1016/j.inoche.2026.117664

DO - 10.1016/j.inoche.2026.117664

M3 - Article

VL - 194

JO - Inorganic Chemistry Communication

JF - Inorganic Chemistry Communication

SN - 1387-7003

IS - P2

M1 - 117664

ER -