In Situ Generation of Vertically Crossed P-Cu₃Se₂ Ultrathin Nanosheets Derived from Cu₂S Nanorod Arrays for High-Performance Supercapacitors

Abstract

Transition-metal selenides (TMSs) have great potential in the synthesis of supercapacitor electrode materials due to their rich content and high specific capacity. However, the aggregation phenomenon of TMS materials in the process of charging and discharging will cause capacity attenuation, which seriously affects the service life and practical applications. Therefore, it is of great practical significance to design simple and efficient synthesis strategies to overcome these shortcomings. Hence, P-doped Cu3Se2 nanosheets are loaded on vertically aligned Cu2S nanorod arrays to synthesize CF/Cu2S@Cu3Se2/P nanocomposites with a unique core–shell heterostructure. Notably, the Cu2S precursors can be rapidly converted into Cu3Se2 nanorod arrays in situ in just 30 min at room temperature. The unique core–shell heterostructure effectively avoids the aggregation phenomenon, and the doped P elements further enhance the electrochemical properties of the electrode materials. Therefore, the as-prepared CF/Cu2S@Cu3Se2/P electrode exhibits a high areal capacitance of 5054 mF cm–2 (1099 C g–1) at 3 mA cm–2 and still retains 90.2% capacitance after 10 000 galvanostatic charge–discharge (GCD) cycles. The asymmetric supercapacitor (ASC) device assembled from synthetic CF/Cu2S@Cu3Se2/P and activated carbon (AC) possesses an energy density of 41.1 Wh kg–1 at a power density of 480.4 W kg–1. This work shows that the designed CF/Cu2S@Cu3Se2/P electrode has broad application prospects in the field of electrochemical energy storage.

Highly Reversibly Stretchable and Elastically Wearable Textile Supercapacitor

“…As shown in the corresponding Ragone plot (Figure g), the energy density of the textile supercapacitor reaches 82 Wh kg –1 at a power density of 750 W kg –1 . For a systematic and comprehensive comparison, the reported stretchable supercapacitors based on elastic/inelastic materials and nonstretchable supercapacitors based on transition metal selenides are listed in Figure g − and Table S3. This energy density of the textile supercapacitor is superior to that of the stretchable supercapacitors and yet is closer to that of the nonstretchable supercapacitors, which confirms the effective faradaic redox energy storage of TSMA on the cotton–metallic textile.…”

Directly Sputtered Molybdenum Disulfide Nanoworms Decorated with Binder-less VN and W2N Nanoarrays for Bendable Large-Scale Asymmetric Supercapacitor

“…Over the past decade, the large-scale exhaustion of fossil fuels and their ecological impacts have drawn significant attention from the research community to develop clean and alternative renewable sources of energy. The rapid development of our modern technological society and globalization have dramatically increased energy consumption, triggering research activities toward green energy applications. , Therefore, energy harvesting from existing renewable sources and the advancement of new energy storage/conversion technologies have become the prime goal of the scientific community. In order to cater to the energy demand, energy storage technologies, including rechargeable batteries, traditional capacitors, fuel cells, and electrochemical capacitors (also called supercapacitors), are anticipated to be the most promising electrical energy systems. − Among various energy storage techniques, supercapacitors (SCs) are capable of having rapid charge–discharge efficiency, a longer life span, excellent reversibility, high specific capacitance, and low maintenance.…”

Flexible All-Solid-State Asymmetric Supercapacitors Based on PPy-Decorated SrFeO3−δ Perovskites on Carbon Cloth

“…Electronic devices are facing higher requirements to adapt to different environments. − As wearable and portable electronic devices develop, new challenges such as a mechanically robust, flexible, and high power density arise for the corresponding energy supply system. , Supercapacitors offer higher power density and better cycle life than traditional batteries. , However, the low energy density restricts their practical application in powering portable devices. − It is well-known that electrodes with advanced mechanical and electrochemical features are crucial for flexible supercapacitors. Various strategies, such as morphological control, porous structure construction, and composite design, have been widely investigated and applied to enhance the electrochemical performance of flexible electrode materials. − …”