Increasing the performance of energy storage systems using different metal oxides and carbon nanomaterial as support scaffolds in electrode manufacture is of great importance. However, deposition of active material using binders or conductive agents results in reduced effective contact areas in the electrodes and between the electrolytes, lowering the energy storage capacity. In this work, a homogeneous and stable low current electrodeposition of binary metal oxides MnO2/Co3O4 on superaligned electrospun carbon nanofibers (SA-ECNFs) greatly overcomes these shortcomings. The morphology tests revealed that the manganese oxide (MnO2) and cobalt oxide (Co3O4) were uniformly wrapped around the carbon nanofibers to form a porous morphology, rendering high energy storage capacity from both the pseudocapacitance and electrochemical double layer (ECDL). Electrochemical tests indicated that the as-prepared MnO2/Co3O4@SA-ECNFs electrode displays a specific capacitance of 728 F g–1 in 6 M KOH electrolyte in CV vs 622 F g–1 of MnO2@SA-ECNFs electrode at 5 mV s–1. The performance of galvanic charge–discharge (GCD) at 2 A g–1 of the electrode demonstrated 64.5 Wh kg–1 for energy density and 1276 W kg–1 for power density and a capacity retention of 71.8% over 11 000 cycles.

Heteroatom doping is regarded as a promising method for controlling the optoelectronic properties of carbon nanodots (CNDs), notably their fluorescence and antioxidation activities. In this study, phosphorous (P) and boron (B) are doped at different quantities in the CNDs’ structures to investigate their effects on the optical and antioxidation properties. Both the dopants can enhance light absorption and fluorescence, yet via different approaches. After doping, the UV–vis absorption of high P%-CNDs demonstrated a slight blue shift (348–345 nm), while the high B%-CNDs showed a minor red shift (348–351 nm), respectively. The fluorescence emission wavelength of doped CNDs changes marginally while the intensity increases significantly. Structural and composition characterizations show elevated levels of C=O on the surface of high P%-CND compared to low P%-CNDs. In B-doped CNDs, more NO 3 – functional groups and O–C=O bonds and fewer C–C bonds form at the surface of high B%-CNDs compared to the low B%-CNDs. A radical scavenging study using 2,2-diphenyl-1-picrylhydrazyl (DPPH) was carried out for all CNDs. It was found that the high B%-CNDs exhibited the highest scavenging capacity. The effects of the atomic properties of dopants and the resulting structures of CNDs, including atomic radius, electronegativity, and bond lengths with carbon, on the optoelectronic property and antioxidative reactions of CNDs are comprehensively discussed. It suggests that the effect of P-doping has a major impact on the carbogenic core structure of the CNDs, while the B-doping mainly impacts the surface functionalities.

Amphiphilic phospholipid-iodinated polymer conjugates were designed and synthesized as new macromolecular probes to enable a highly radiopaque and biocompatible imaging technology. Bioconjugation of PEG 2000-phospholipids and iodinated polyesters by click...