TY - JOUR
T1 - Lattice Oxygen Activation in NiFe (Oxy)hydroxide using Se
AU - Jo, Seunghwan
AU - Sohn, Jung Inn
N1 - Publisher Copyright:
© Materials Research Society of Korea, All rights reserved
PY - 2022
Y1 - 2022
N2 - The lattice oxygen mechanism (LOM) is considered one of the promising approaches to overcome the sluggish oxygen evolution reaction (OER), bypassing -OOH* coordination with a high energetic barrier. Activated lattice oxygen can participate in the OER as a reactant and enables O*-O* coupling for direct O2 formation. However, such reaction kinetics inevitably include the generation of oxygen vacancies, which leads to structural degradation, and eventually shortens the lifetime of catalysts. Here, we demonstrate that Se incorporation significantly enhances OER performance and the stability of NiFe (oxy)hydroxide (NiFe) which follows the LOM pathway. In Se introduced NiFe (NiFeSe), Se forms not only metal-Se bonding but also Se-oxygen bonding by replacing oxygen sites and metal sites, respectively. As a result, transition metals show reduced valence states while oxygen shows less reduced valence states (O-/O22-) which is a clear evidence of lattice oxygen activation.
AB - The lattice oxygen mechanism (LOM) is considered one of the promising approaches to overcome the sluggish oxygen evolution reaction (OER), bypassing -OOH* coordination with a high energetic barrier. Activated lattice oxygen can participate in the OER as a reactant and enables O*-O* coupling for direct O2 formation. However, such reaction kinetics inevitably include the generation of oxygen vacancies, which leads to structural degradation, and eventually shortens the lifetime of catalysts. Here, we demonstrate that Se incorporation significantly enhances OER performance and the stability of NiFe (oxy)hydroxide (NiFe) which follows the LOM pathway. In Se introduced NiFe (NiFeSe), Se forms not only metal-Se bonding but also Se-oxygen bonding by replacing oxygen sites and metal sites, respectively. As a result, transition metals show reduced valence states while oxygen shows less reduced valence states (O-/O22-) which is a clear evidence of lattice oxygen activation.
KW - Chalcogen
KW - Electrocatalysts
KW - Lattice oxygen mechanism
KW - Oxygen evolution reaction
KW - Transition metal (oxy)hydroxide
UR - http://www.scopus.com/inward/record.url?scp=85138487016&partnerID=8YFLogxK
U2 - 10.3740/MRSK.2022.32.8.339
DO - 10.3740/MRSK.2022.32.8.339
M3 - Article
AN - SCOPUS:85138487016
SN - 1225-0562
VL - 32
SP - 339
EP - 344
JO - Korean Journal of Materials Research
JF - Korean Journal of Materials Research
IS - 8
ER -