Li–air batteries represent cutting edge electrochemical energy storage devices, but their practical applications have been precluded by the high cathode cost, the low discharge/charge efficiency, and/or the short battery lifetime. Here, we developed a low-cost, but very efficient, air electrode from porous nitrogen-doped holey graphene for rechargeable nonaqueous Li–O2 cells. The resultant Li–O2 cell can deliver a high round-trip efficiency (85%) and a long cycling life (>100 cycles) under controlled discharge/charge depths or a high capacity of 17 000 mAh/g under the full discharge/charge condition, superior to most other carbonaceous air cathodes. The observed superb performance for the air electrode based on the nitrogen-doped holey graphene can be attributed to its efficient metal-free catalytic activity and three-dimensional mass transport pathway. Therefore, this work represents a new approach to low-cost, efficient, metal-free, binder-free, and hierarchically porous air electrodes useful for energy...

Nitrogen-Doped Holey Graphene for High-Performance Rechargeable Li–O2 Batteries

Spinel ferrites are regarded as promising electrode materials for supercapacitors (SCs) in virtue of their low cost and high theoretical specific capacitances. However, bulk ferrites suffer from limited electrical conductivity, sluggish ion transport, and inadequate active sites. Therefore, rational structural design and composition regulation of the ferrites are approaches to overcome these limitations. Herein, a general biomimetic mineralization synthetic strategy is proposed to synthesize ferrite (XFe2O4, X = Ni, Co, Mn) quantum dot/graphene (QD/G) heterostructures. Anchoring ferrite QD on the graphene sheets not only strengthens the structural stability, but also forms the electrical conductivity network needed to boost the ion diffusion and charge transfer. The optimized NiFe2O4 QD/G heterostructure exhibits specific capacitances of 697.5 F g−1 at 1 A g−1, and exceptional cycling performance. Furthermore, the fabricated symmetrical SCs deliver energy densities of 24.4 and 17.4 Wh kg−1 at power densities of 499.3 and 4304.2 W kg−1, respectively. Density functional theory calculations indicate the combination of NiFe2O4 QD and graphene facilitates the adsorption of potassium atoms, ensuring rapid ion/charge transfer. This work enriches the application of the biomimetic mineralization synthesis and provides effective strategies for boosting ion/charge transfer, which may offer a new way to develop advanced electrodes for SCs.

https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/adma.202300940

Biomimetic Construction of Ferrite Quantum Dot/Graphene Heterostructure for Enhancing Ion/Charge Transfer in Supercapacitors

Carbon cloth supported flower-like porous nickel-based electrodes boosting ion/charge transfer characteristics of flexible supercapacitors

Supercapacitors have gained significant attention as energy storage devices due to their high specific power, fast charge–discharge rate and extended cycling stability. Recent research focuses on the search for new electrode materials to enhance the specific capacitance of supercapacitors. Conducting polymers (CPs) and metal oxides (MOs) are being extensively tested as electrode materials in supercapacitors. CPs have poor cycling stability and low mechanical strength but are easy to process, while MOs exhibit easy availability, variable oxidation states and possess high specific capacitance, but they are somewhat difficult to process. Therefore, combining both (CP) and (MO) in a composite offers better results for the electrochemical performance of supercapacitors. This review mainly focuses on the discussion of CP/MO based nanocomposites recently reported for supercapacitor applications. The collective information presented in this report will provide researchers a view into the latest developments in this field. The continued research on this topic will reveal further potential applications of CP/MO composites.

/pdf/an-overview-of-recent-advancements-in-conducting-polymer-1zo3qmmk.pdf

An Overview of Recent Advancements in Conducting Polymer–Metal Oxide Nanocomposites for Supercapacitor Application

Construction of Co3O4 porous rod/graphene heterostructures toward strong and broadband microwave absorption applications

Facile growth of hierarchical SnO2@PPy composites on carbon cloth as all-solid-state flexible supercapacitors

Honeycomb nickel-cobalt layered double hydroxides supported on carbon skeleton as high-performance electrodes in supercapacitors

Construction of hairbrush-like (Ni3S2/NiSe-3:1)/carboxymethylcellulose derived carbon heterostructure as high-performance electrodes for supercapacitors

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