Photocatalytic resource production, utilizing photo-generated electrons and holes for reactions like water splitting and uranium extraction from seawater, demands materials balancing broad light absorption and efficient charge separation. Two-dimensional sp²-carbon-conjugated covalent organic frameworks (sp²c COFs) emerge as highly promising photocatalysts due to their extended π-conjugation, enabling wide solar spectrum capture (including near-infrared) and enhanced carrier mobility. Current design strategies focus on incorporating photosensitive groups, constructing donor-acceptor heterojunctions, and optimizing high-conjugation to boost light harvesting and suppress charge recombination. Furthermore, designing specific active sites is also crucial for photocatalytic uranium extraction from seawater. This review summarizes the characteristics of different two dimensional sp²c COFs and their photocatalytic applications in photocatalytic hydrogen production and uranium recovery. Finally, it outlines future development trajectories for advancing sp²c COFs in sustainable photocatalysis.

Nickel-cobalt-based (NiCo) supercapacitors have garnered widespread attention owing to their high rate performance, safety, and low cost. However, conventional NiCo-layered double hydroxide (LDH) materials often exhibit low electrical conductivity, structural instability, and a limited number of exposed active sites. To address these issues, a reaction-time-controlled hydrothermal strategy was utilized to regulate the growth of an aluminum-doped nickel-cobalt LDH, enabling the formation of flower-like microstructures composed of interconnected nanoneedle arrays with improved ion-transport pathways and electrochemical performance. Notably, Al doping expanded the interlayer spacing, which facilitated rapid ion diffusion and improved the rate capability and charge–discharge efficiency. The electrochemical performance of the assembled device, including energy density, power density, and cycling stability, was systematically studied. Moreover, device-level optimization was achieved using strategies to widen the operating voltage window in asymmetric supercapacitors. The feasibility of the device was further supported by powering a light-emitting diode, electronic watch, calculator, and small electric fan, confirming its stable output performance.