One potential solution to the problem of energy storage in certain transportation vehicles is the development of multifunctional materials. Specifically, structural supercapacitors offer a combination of mechanical strength and energy storage capabilities, which could replace vehicle components and reduce overall vehicle weight. However, structural electrodes made from carbon fiber face a significant limitation due to their low specific surface area. This study examines the direct synthesis of metal‐organic frameworks on the surface of carbon fibers. Structures such as ZIF‐8 and ZIF‐L can be easily synthesized from the same metal‐organic precursors and exhibit high surface areas, making them ideal for this application. Both ZIF structures form a continuous coating on the carbon fiber, increasing the specific surface area of the electrodes. For the ZIF‐8 structure, the coating achieves a thickness of 1 μm and a specific surface area of 30.24 m ² /g. In contrast, the sheet‐like geometry of the ZIF‐L results in greater thicknesses, though with a lower specific surface area of only 0.7 m ² /g. The potential use of these electrodes in supercapacitor devices has been demonstrated through the assembly of structural supercapacitors with a polymeric solid electrolyte. The supercapacitor with ZIF‐8 electrodes has achieved a specific capacitance of 7.78 mF/g. Despite the limitations associated with internal resistance, all structural electrodes have shown stability over charge and discharge cycles. Highlights: Continuous layer by direct synthesis of ZIF‐8 and ZIF‐L on carbon fiber surfaces. More than 40 times more surface area with ZIF‐8 than ZIF‐L on electrodes. Solid‐state supercapacitors show a capacitance of 7.78 mF/g and 92% efficiency.

In polymer‐based dental composites, wear is a three‐body wear system mainly abrasive, because of the food particles and wear products suspended in the oral cavity, which are transferred to the microcavities of the surface of the replacements. Due to this fact, the incorporation of nanodiamond as reinforcement in these polymer–matrix composites, which promotes the creation of a solid lubricant tribofilm surface could be advantageous. With the reinforcement of nanodiamonds, BisGMA/TEGDMA‐based composites increase their microhardness by 95%–420%. A maximum hardness exceeding 65 HV is achieved with a reinforcement of 3.2 wt%. The specific wear rate of neat BisGMA/TEGDMA is near 10⁻⁴ mm³/Nm and the Archard's coefficient is 2.6 × 10⁵. The incorporation of a content of 1.6 wt% ND is enough to cause a diminution of ~78% in the friction coefficient and a reduction of the specific wear rate and Archard's coefficient of ~50%. Nevertheless, the addition of relatively high contents reduces the effectiveness of photoinitiation and photocuring, which is related to the scattering and absorption of light radiation by ND. This causes a significant decline in elastic properties starting at 50 μm from the surface.Highlights: Photocuring polymer resin was successfully reinforced with nanodiamonds. Microhardness increases from 95% up to 420%, close to commercial composites. Friction coefficient and wear rate are reduced with 1.6 wt% nanodiamonds. High levels of reinforcement reduce the effectiveness of photocuring.

Owing to the increasing demand for wearable electronics, flexible energy storage devices, such as supercapacitors, have gained interest in the electronic industry. In this context, asymmetric configurations have emerged as a promising strategy for the development of wider potential window supercapacitors. On the other hand, MOF-derived synthesis of transition metal oxides is known to result in porous materials, which exhibit better electrochemical performance. In this work, a MOF-derived Fe₂O₃ coating on carbon fiber woven substrate is proposed as a negative supercapacitor electrode for asymmetric flexible devices. Moreover, the MOF calcination time was evaluated in order to ensure the best electrochemical performance possible, achieving for the sample calcined for 2 h a specific capacitance of 18.8 F/g at a current density of 200 mA/g and an excellent rate capability. In addition, not only was this promising material obtained, but an asymmetric flexible supercapacitor based on two MOF-derived TMO coatings on carbon fiber woven electrodes was manufactured and characterized as a proof of concept. This supercapacitor displayed a specific capacitance of 229 mF/cm², an energy density of 0.067 mWh/cm² and a power density of 0.11 mW/cm² at 0.15 mA/cm². Moreover, the flexible supercapacitor retained 94.1% of its capacitance even after being bent to 90°.