Details

Autor(en) / Beteiligte

• Ibrahim, Kassa B.
• Tsai, Meng‐Che
• Chala, Soressa A.
• Berihun, Mulatu K.
• Kahsay, Amaha W.
• Berhe, Taame A.
• Su, Wei‐Nien
• Hwang, Bing‐Joe

Titel

A review of transition metal‐based bifunctional oxygen electrocatalysts

Ist Teil von

• Journal of the Chinese Chemical Society (Taipei), 2019-08, Vol.66 (8), p.829-865

Ort / Verlag

Weinheim: Wiley‐VCH Verlag GmbH & Co. KGaA

Erscheinungsjahr

2019

Quelle

Wiley Online Library All Journals

Beschreibungen/Notizen

• Electrochemical energy storage and conversion devices play a key role in the development of clean, sustainable, and efficient energy systems to meet the sustainable growth of our society. However, challenging issues including the sluggish kinetics of oxygen electrode reactions involving the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) are present, limiting the implementation of devices such as metal‐air batteries, water electrolyzers, and regenerative fuel cells. In this review, various monometallic and bimetallic transition metal oxides (TMOs) and hydroxides are summarized in terms of their application for ORR/OER, in which the merits and demerits of various precious metal and carbon‐based metal oxide materials are discussed, with requirements for better electrocatalysts and catalyst support being introduced as well. Following this, different approaches to improve catalytic activity such as the introduction of doping and defects, the manipulation of crystal facets, and the engineering of supports, compositions, and morphologies are summarized in which TMOs with improved ORR/OER catalytic activities can be synthesized, further improving the speed, stability, and polarization of electrochemical energy storage and conversion devices. Finally, perspectives into the improvement of performance and the better understanding of ORR/OER mechanisms for bifunctional electrocatalysts using in situ spectroscopic techniques and density functional theory calculations are also discussed. It is important to design and enhance activity and stability of bifunctional electrocatalyst. In order to improve both activity and stability, doping engineering, morphology and compositional engineering, defect engineering, support engineering, and crystal facet engineering are most important factors.