The article discusses the distinction between true pseudocapacitive and faradaic electrode materials in electrochemical capacitors (ECs). It clarifies that pseudocapacitance refers to materials that exhibit electrochemical behavior similar to capacitive electrodes, such as MnO₂, which involve faradaic reactions. In contrast, materials like Ni(OH)₂ and cobalt oxides, despite their faradaic behavior, are often incorrectly labeled as pseudocapacitive. The term "pseudocapacitance" is defined as arising from charge storage mechanisms that are not purely based on double-layer capacitance but involve redox reactions. The article emphasizes that the concept of "capacitance" (F) does not apply to purely faradaic behavior, where "capacity" (C or mAh) is more appropriate. It also discusses the confusion in terminology, particularly in the case of hybrid devices, where the term "asymmetric" is preferred over "hybrid" to avoid ambiguity. The article highlights the importance of correctly identifying the electrochemical behavior of materials to ensure accurate descriptions and applications in ECs. It concludes that pseudocapacitive terminology should only be used for specific materials that exhibit electrochemical behavior typical of capacitive electrodes, not for materials with faradaic characteristics. The article also provides examples and references to clarify the definitions and applications of these terms in the field of electrochemical capacitors.The article discusses the distinction between true pseudocapacitive and faradaic electrode materials in electrochemical capacitors (ECs). It clarifies that pseudocapacitance refers to materials that exhibit electrochemical behavior similar to capacitive electrodes, such as MnO₂, which involve faradaic reactions. In contrast, materials like Ni(OH)₂ and cobalt oxides, despite their faradaic behavior, are often incorrectly labeled as pseudocapacitive. The term "pseudocapacitance" is defined as arising from charge storage mechanisms that are not purely based on double-layer capacitance but involve redox reactions. The article emphasizes that the concept of "capacitance" (F) does not apply to purely faradaic behavior, where "capacity" (C or mAh) is more appropriate. It also discusses the confusion in terminology, particularly in the case of hybrid devices, where the term "asymmetric" is preferred over "hybrid" to avoid ambiguity. The article highlights the importance of correctly identifying the electrochemical behavior of materials to ensure accurate descriptions and applications in ECs. It concludes that pseudocapacitive terminology should only be used for specific materials that exhibit electrochemical behavior typical of capacitive electrodes, not for materials with faradaic characteristics. The article also provides examples and references to clarify the definitions and applications of these terms in the field of electrochemical capacitors.