Conventional bulky and rigid power systems are incapable of meeting flexibility and breathability requirements for wearable applications. Despite the tremendous efforts dedicated to developing various 1D energy storage devices with sufficient flexibility, challenges remain pertaining to fabrication scalability, cost, and efficiency. Here, a scalable, low-cost, and high-efficiency 3D printing technology is applied to fabricate a flexible all-fiber lithium-ion battery (LIB). Highly viscous polymer inks containing carbon nanotubes and either lithium iron phosphate (LFP) or lithium titanium oxide (LTO) are used to print LFP fiber cathodes and LTO fiber anodes, respectively. Both fiber electrodes demonstrate good flexibility and high electrochemical performance in half-cell configurations. All-fiber LIB can be successfully assembled by twisting the as-printed LFP and LTO fibers together with gel polymer as the quasi-solid electrolyte. The all-fiber device exhibits a high specific capacity of ≈110 mAh g −1 at a current density of 50 mA g −1 and maintains a good flexibility of the fiber electrodes, which can be potentially integrated into textile fabrics for future wearable electronic applications.

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Here, a hierarchical porous NiO film/ITO glass bifunctional electrode has been prepared successfully via growing MOF-74 in situ on ITO, which shows outstanding cycle reversibility, excellent capacitance, and high coloration efficiency.

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Precise optical and thermal regulatory systems are found in nature, specifically in the microstructures on organisms’ surfaces. In fact, the interaction between light and matter through these microstructures is of great significance to the evolution and survival of organisms. Furthermore, the optical regulation by these biological microstructures is engineered owing to natural selection. Herein, the role that microstructures play in enhancing optical performance or creating new optical properties in nature is summarized, with a focus on the regulation mechanisms of the solar and infrared spectra emanating from the microstructures and their role in the field of thermal radiation. The causes of the unique optical phenomena are discussed, focusing on prevailing characteristics such as high absorption, high transmission, adjustable reflection, adjustable absorption, and dynamic infrared radiative design. On this basis, the comprehensive control performance of light and heat integrated by this bioinspired microstructure is introduced in detail and a solution strategy for the development of low‐energy, environmentally friendly, intelligent thermal control instruments is discussed. In order to develop such an instrument, a microstructural design foundation is provided.

Radiative cooling, as a passive way to dissipate heat into outer space without any extra energy, has attracted considerable attention recently. However, the metal reflector of the conventional cooling radiators fails to work in the ultraviolet due to the giant absorption of the metal itself in such a waveband; meanwhile, the selective thermal emission within the atmospheric window still has much room for improvement. In this work, we propose a dual-band selective emitter design with multi-nanolayers, which not only makes up for the deficiency of metal reflectors by utilizing the bandgap of photonic crystals but also enables a broadband emissivity peak in the atmospheric window thanks to the suitable material selection. By engineering simultaneously the forbidden band and thermal emission of photonic crystals, both a near-perfect solar reflection and a considerably high thermal emission are achieved at selective wavelength ranges. The investigation suggests an alternative candidate for the radiative coolers, as well as providing a rational nanoscale design approach for similar photothermal devices.

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