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Research on alternative energy harvesting technologies, conversion and storage systems with high efficiency, cost-effective and environmentally friendly systems, such as fuel cells, rechargeable metal-air batteries, unitized regenerative cells, and water electrolyzers has been stimulated by the global demand on energy. The conversion between oxygen and water plays a key step in the development of oxygen electrodes: oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), processes activated mostly by precious metals, like platinum. Their scarcity, their prohibitive cost, and declining activity greatly hamper large-scale applications. This issue reports on novel non-precious metal electrocatalysts based on the innovative design in chemical compositions, structure, and morphology, and supports for the oxygen reaction.

n/a --- nitrogen sulfur co-doped carbon nanofibers --- layered double hydroxide --- three-dimensional --- water splitting --- non-precious metal --- metal–organic framework --- Co-bpdc/MWCNTs composites --- alkaline --- nanocarbon --- Fe-N-C catalyst --- cobalt-based electrocatalysts --- 2 --- non-precious metal catalyst --- 3 --- silver bismuthate --- 4 --- graphene-carbon nanotube aerogel --- 6-tri(2-pyridyl)-1 --- Co-bpdc --- binary nitrogen precursors --- g-C3N4 --- oxygen evolution reaction --- mesoporous NiO --- electrocatalyst --- nucleophilic attack --- 5-triazine --- cobalt and nitrogen co-doped --- fuel cells --- metal-free catalysts --- oxygen reduction reaction --- hydrogen evolution reaction --- heteroatom doping --- electrophilic Ni3+ and O? --- bacterial cellulose/poly(methylene blue) hybrids --- active site --- manganese dioxide --- electrocatalysis --- metal-organic framework