The perovskite oxides were known as an oxygen anion intercalation electrode material for pseudocapacitance in 2014[1].Although this new energy storage mechanism is defined as oxygen anion intercalation,it differs fund...The perovskite oxides were known as an oxygen anion intercalation electrode material for pseudocapacitance in 2014[1].Although this new energy storage mechanism is defined as oxygen anion intercalation,it differs fundamentally from ion intercalation in batteries.As shown in Fig.1a,b,energy storage and release are mainly achieved through bulk redox reactions in the electrodes for batteries,controlled by bulk diffusion,demonstrating high energy and low power density[2].For pseudocapacitors,a type of supercapacitor,their electrochemical characteristics differ from those of double-layer capacitors,which only undergo physical reactions,and also differ from batteries,which undergo Faraday redox reactions in the bulk phase.Pseudocapacitance primarily relies on surface Faradaic reactions caused by charge transfer at or near the surface,without bulk diffusion control,enabling them to maintain impressive energy density while also exhibiting extremely fast reaction kinetics[3].Oxygen anion intercalation is a typical pseudocapacitive behavior.展开更多
基金financially supported by the Guangdong Basic and Applied Basic Research Foundation(2022B1515120019)the Science and Technology Development Project of Guangdong Academy of Sciences(2022GDASZH-2022010109,2023GDASZH-2023030601)。
文摘The perovskite oxides were known as an oxygen anion intercalation electrode material for pseudocapacitance in 2014[1].Although this new energy storage mechanism is defined as oxygen anion intercalation,it differs fundamentally from ion intercalation in batteries.As shown in Fig.1a,b,energy storage and release are mainly achieved through bulk redox reactions in the electrodes for batteries,controlled by bulk diffusion,demonstrating high energy and low power density[2].For pseudocapacitors,a type of supercapacitor,their electrochemical characteristics differ from those of double-layer capacitors,which only undergo physical reactions,and also differ from batteries,which undergo Faraday redox reactions in the bulk phase.Pseudocapacitance primarily relies on surface Faradaic reactions caused by charge transfer at or near the surface,without bulk diffusion control,enabling them to maintain impressive energy density while also exhibiting extremely fast reaction kinetics[3].Oxygen anion intercalation is a typical pseudocapacitive behavior.
