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Peptide self‐assembly is an attractive route for the synthesis of intricate organic nanostructures that possess remarkable structural variety and biocompatibility. Recent studies on peptide‐based, self‐assembled materials have expanded beyond the construction of high‐order architectures; they are now reporting new functional materials that have application in the emerging fields such as artificial...
Sulfur cathodes have become appealing for rechargeable batteries because of their high theoretical capacity (1675 mA h g−1). However, the conventional cathode configuration borrowed from lithium‐ion batteries may not allow the pure sulfur cathode to put its unique materials chemistry to good use. The solid(sulfur)–liquid(polysulfides)–solid(sulfides) phase transitions generate polysulfide intermediates...
With the development of flexible electronic devices and large‐scale energy storage technologies, functional polymer‐matrix nanocomposites with high permittivity (high‐k) are attracting more attention due to their ease of processing, flexibility, and low cost. The percolation effect is often used to explain the high‐k characteristic of polymer composites when the conducting functional fillers are dispersed...
On‐chip microsupercapacitors (MSCs) have application in powering microelectronic devices. Most of previous MSCs are made from carbon materials, which have high power but low energy density. In this work, 3D interdigital Au/MnO2/Au stacked MSCs have been fabricated based on laser printed flexible templates. This vertical‐stacked electrode configuration can effectively increase the contact area between...
A transition‐metal‐free asymmetric supercapacitor (ASC) is successfully fabricated based on an earth‐abundant biomass derived redox‐active biomolecule, named lawsone. Such an ASC exhibits comparable or even higher energy densities than most of the recently reported transition‐metal‐based ASCs, and this green ASC generation from renewable resources is promising for addressing current issues of electronic...
On page 4683, H. Wang L. Guo, and co‐workers present a novel transition‐metal‐free asymmetric supercapacitor (ACS) based on a biomolecule named lawsone (2‐hydroxy‐1,4‐naphthoquinone), which is a natural component derived from henna. The ASC shows comparable or even higher energy densities compared to those of reported transition‐metal‐based ASCs, and provides a new strategy for the generation of versatile...
State‐of‐the‐art energy storage devices are capable of delivering reasonably high energy density (lithium ion batteries) or high power density (supercapacitors). There is an increasing need for these power sources with not only superior electrochemical performance, but also exceptional flexibility. Graphene has come on to the scene and advancements are being made in integration of various electrochemically...
Lithium‐ion capacitors (LICs) are promising electrical energy storage systems for mid‐to‐large‐scale applications due to the high energy and large power output without sacrificing long cycle stability. However, due to the different energy storage mechanisms between anode and cathode, the energy densities of LICs often degrade noticeably at high power density, because of the sluggish kinetics limitation...
A high‐performance lithium‐ion capacitors (LIC) based on two dimensional nanosheet materials, made of ZnMn2O4‐graphene (ZMO‐G) hybrid nanosheets anode and N‐doped carbon nanosheets (NCN) cathode is realized by P. S. Lee and co‐workers in article number 1602893. The fabricated LIC delivers a high specific energy of 202.8 Wh kg−1 at a power of 180 W kg−1, the specific energy can still remain 98 Wh kg...
Improved thin‐film microbatteries are needed to provide appropriate energy‐storage options to power the multitude of devices that will bring the proposed “Internet of Things” network to fruition (e.g., active radio‐frequency identification tags and microcontrollers for wearable and implantable devices). Although impressive efforts have been made to improve the energy density of 3D microbatteries,...
Highly optimized nickel cobalt mixed oxide has been derived from zeolite imidazole frameworks. While the pure cobalt oxide gives only 178.7 F g−1 as the specific capacitance at a current density of 1 A g−1, the optimized Ni:Co 1:1 has given an extremely high and unprecedented specific capacitance of 1931 F g−1 at a current density of 1 A g−1, with a capacitance retention of 69.5% after 5000 cycles...
Micro‐supercapacitors (MSCs) based on mesoporous polyaniline patterned graphene are demonstrated. The synergic effect from both electron‐double‐layer‐capacitive graphene and pseudocapacitive mesoporous‐polyaniline leads to outstanding MSC device performances, in regard to excellent volumetric capacitance and rate capabilities, which further result in a high power density of 600 W cm−3, suggesting...
Recent progress in the currently available methods of producing black phosphorus bulk and phosphorene are presented. The effective passivation approaches toward improving the air stability of phosphorene are also discussed. Furthermore, the research efforts on the phosphorene and phosphorene‐based materials for potential applications in lithium ion batteries, sodium ion batteries, and thermoelectric...
Graphene‐oxide (GO) based porous structures are highly desirable for supercapacitors, as the charge storage and transfer can be enhanced by advancement in the synthesis. An effective route is presented of, first, synthesis of three‐dimensional (3D) assembly of GO sheets in a spherical architecture (GOS) by flash‐freezing of GO dispersion, and then development of hierarchical porous graphene (HPG)...
Wearable self‐powered sensing systems are considered to be one of the key technologies for the next generation of smart personal electronics. In article number 1701791, G. Shen and co‐workers provide an overview of the latest research to exploit applications of integrated self‐powered sensing systems, and also highlight future research in this exciting field.
Due to the boom of miniaturized electronic devices in the last decade, there are great demands for ultrathin and flexible on‐chip rechargeable energy storage microdevices. Supercapacitor, as one of the most hopeful appearing energy storage devices, can provide a wonderful alternative to batteries or electrolytic capacitors, owing to its fast charge and discharge rates, high power density, and long...
Wearable/flexible electronic sensing systems are considered to be one of the key technologies in the next generation of smart personal electronics. To realize personal portable devices with mobile electronics application, i.e., wearable electronic sensors that can work sustainably and continuously without an external power supply are highly desired. The recent progress and advantages of wearable self‐powered...
One major challenge for wearable electronics is that the state‐of‐the‐art batteries are inadequate to provide sufficient energy for long‐term operations, leading to inconvenient battery replacement or frequent recharging. Other than the pursuit of high energy density of secondary batteries, an alternative approach recently drawing intensive attention from the research community, is to integrate energy‐generation...
Grid‐scale energy storage batteries with electrode materials made from low‐cost, earth‐abundant elements are needed to meet the requirements of sustainable energy systems. Sodium‐ion batteries (SIBs) with iron‐based electrodes offer an attractive combination of low cost, plentiful structural diversity and high stability, making them ideal candidates for grid‐scale energy storage systems. Although...
Sodium‐ion batteries have attracted increasing attention in recent years. In article number 1703116, Yuliang Cao and co‐workers systematically summarize advancements in the field of iron‐based electrode materials for grid‐scale sodium‐ion batteries. The progress in iron‐based electrode materials, including oxides, polyanions, ferrocyanides, and sulfides, is briefly summarized. Such iron‐based electrode...
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