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The rapid expansion of the development of the electrochemical capacitor appliance and its industry areas has created the need for long cycling stability of over 30 000 cycles along with an ultrafast performance (referred to as ultrafast longevity). In recent years, zinc-ion hybrid supercapacitors (ZICs) are considered to be emerging energy storage applications thanks to their high specific capacity and remarkable cycling stability. However, ZICs still face serious challenges in overcoming the ultrafast performance and lifetime limitations related to the cathode materials, activated carbon (AC), due to inadequate electrical properties and poor wettability between the electrolyte and the electrode, which cause reductions in specific capacity and lifetime rapidly at high current densities during cycling. To address these drawbacks, a novel phosphorus (P) and boron (B) codoped AC (designated P&B-AC) is presented herein with enhanced electrical properties due to B-doping along with improved wettability due to P-doping to provide an ultrafast longevity ZICs. The prepared ZICs display a superior electrochemical performance with an excellent specific capacity of 169.4 mAh g–1 at 0.5 A g–1, a remarkable ultrafast performance of 84.0 mAh g–1 at 10 A g–1, and outstanding ultrafast longevity indicated by an 88% capacity retention for up to 30 000 cycles at 10 A g–1. The excellent energy storage ability is firmly ascribed to the P and B codoping synergistic effect, leading to a superior diffusion capability of Zn ion and charge-transfer process of the AC cathode.

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The rechargeable aqueous Zn ion battery (ZIB) is a promising candidate for next-generation energy storage technology due to its low cost, low flammability, inherent safety, and high theoretical capacity. Nevertheless,...

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Smart wearable electronics that are fabricated on light‐weight fabrics or flexible substrates are considered to be of next‐generation and portable electronic device systems. Ideal wearable and portable applications not only require the device to be integrated into various fiber form factors, but also desire self‐powered system in such a way that the devices can be continuously supplied with power as well as simultaneously save the acquired energy for their portability and sustainability. Nevertheless, most of all self‐powered wearable electronics requiring both the generation of the electricity and storing of the harvested energy, which have been developed so far, have employed externally connected individual energy generation and storage fiber devices using external circuits. In this work, for the first time, a hybrid smart fiber that exhibits a spontaneous energy generation and storage process within a single fiber device that does not need any external electric circuit/connection is introduced. This is achieved through the employment of asymmetry coaxial structure in an electrolyte system of the supercapacitor that creates potential difference upon the creation of the triboelectric charges. This development in the self‐charging technology provides great opportunities to establish a new device platform in fiber/textile‐based electronics.

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