Monochiral single-walled carbon nanotubes (SWCNTs) can enable high-performance carbon-based electronic devices and integrated circuits. However, their fabrication often requires complex SWCNT purification and enrichment. Herein, we showed that isoindigo-based polymer derivatives (PDPPIID and PFIID) directly enriched (9,8) nanotubes from as-synthesized SWCNT powders selectively and efficiently to yield high concentration (9,8) nanotube inks. The selective wrapping mechanism was elucidated by classical full-atomistic molecular dynamic (MD) simulations. Thin-film transistors (TFTs) were fabricated by depositing the SWCNT ink into device channels using aerosol jet printing. TFT performance was strongly influenced by polymer residues, the deposition condition (humidity), and ink concentration. Optimized TFTs showed excellent device-to-device uniformity with 10⁸ on/off ratios. Further, optoelectronic transistors were fabricated, and their photoelectrical neuromorphic characteristics, storage, memory, and logic functions were characterized under the pulsed light and voltage stimulations, demonstrating excellent application potentials.

Nitrogen-coordinated iron atoms on carbon supports (Fe–N–C) are among the most promising noble-metal-free electrocatalysts for oxygen reduction reaction (ORR). However, their unsatisfactory stability limits their practical application. Herein, we demonstrate a dual-shell Fe–N–C electrocatalyst with excellent catalytic activity and long-term stability. Pyrrole and dopamine are sequentially polymerized on a fumed silica nanoparticle template. Metal precursor (FeCl₃) and pore formation agent (ZnCl₂) were loaded on the inner polypyrrole shell. During carbonization, the Zn evaporation creates abundant mesopores in the polydopamine-derived outer carbon shell, forming a "chain mail" like outer shell that protects Fe–N–C active sites loaded on the inner carbon shell and enables efficient mass transfer. Systematical tuning of the shield thickness and porosity affords the optimal electrocatalyst with a large surface area of 934 ​m² ​g⁻¹ and a high Fe loading of 2.04 ​wt%. This electrocatalyst delivers excellent ORR activity and superior stability in both acidic and alkaline electrolytes. Primary Zn-air batteries fabricated from this electrocatalyst delivers a high-power density of 257 ​mW ​cm⁻² and impressive durability of continuous discharging over 250 ​h. Creating a graphitic and porous carbon protective shell can be further extended to other electrocatalysts to enable their practical applications in energy conversion and storage.