4.8 Article

Construction of Ordered Atomic Donor-Acceptor Architectures in bcc IrGa Intermetallic Compounds toward Highly Electroactive and Stable Overall Water Splitting

Journal

ADVANCED ENERGY MATERIALS
Volume 13, Issue 1, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202202703

Keywords

body-centered cubic; donor-acceptor architectures; intermetallic compounds; iridium; overall water splitting

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Ordered atomic structures and strong d-orbital interactions enable the synthesis of IrGa/N-rGO materials, which exhibit excellent electronic transfer properties and high performance for overall water splitting in alkaline medium.
Benefiting from ordered atomic structures and strong d-orbital interactions, intermetallic compounds (IMCs) are promising electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Herein, the body-centered cubic IrGa IMCs with atomic donor-acceptor architectures are synthesized and anchored on the nitrogen-doped reduced graphene oxide (i.e., IrGa/N-rGO). Structural characterizations and theoretical calculations reveal that the electron-rich Ir sites are atomically dispersed in IrGa/N-rGO, facilitating the electron transfer between Ir atoms and adsorbed species, which can efficiently decrease the energy barriers of the potential determining step for both HER and OER. Impressively, the IrGa/N-rGO||IrGa/N-rGO exhibits excellent performance for overall water splitting in alkaline medium, requiring a low cell voltage of 1.51 V to achieve 10 mA cm(-2), meanwhile, exhibiting no significant degradation for 100 h. This work demonstrates that the rational design of noble metal electrocatalysts with donor-acceptor architectures is beneficial for catalytic reactions in energy conversion applications.

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