The facile and economical electrochemical and successive ionic layer adsorption and reaction (SILAR) methods have been employed in order to prepare manganese oxide (MnO₂) and iron oxide (Fe₂O₃) thin films, respectively with the fine optimized nanostructures on highly flexible stainless steel sheet. The symmetric and asymmetric flexible-solid-state supercapacitors (FSS-SCs) of nanostructured (nanosheets for MnO₂and nanoparticles for Fe₂O₃) electrodes with Na₂SO₄/Carboxymethyl cellulose (CMC) gel as a separator and electrolyte were assembled. MnO₂as positive and negative electrodes were used to fabricate symmetric SC, while the asymmetric SC was assembled by employing MnO₂as positive and Fe₂O₃as negative electrode. Furthermore, the electrochemical features of symmetric and asymmetric SCs are systematically investigated. The results verify that the fabricated symmetric and asymmetric FSS-SCs present excellent reversibility (within the voltage window of 0–1 V and 0–2 V, respectively) and good cycling stability (83 and 91%, respectively for 3000 of CV cycles). Additionally, the asymmetric SC shows maximum specific capacitance of 92 Fg⁻¹, about 2-fold of higher energy density (41.8 Wh kg⁻¹) than symmetric SC and excellent mechanical flexibility. Furthermore, the “real-life” demonstration of fabricated SCs to the panel of SUK confirms that asymmetric SC has 2-fold higher energy density compare to symmetric SC.

The review explores porous thermoelectric materials, emphasizing controlled porosity's impact on phonon scattering and thermal conductivity reduction. Multiple studies were discussed, highlighting prospects and limitations, alongside the latest trends.

In this article we report point defect-assisted doping mechanism and related thermoelectric transport properties in Pb-doped BiCuOTe compounds. The substitution of trivalent Bi³⁺ with divalent Pb²⁺ led to the generation of more than one hole per single Pb atom. The origin of the extra charge carrier was discussed in terms of the formation energy of p-type native point defects, and it could be evidenced by the density functional theory calculations. Related charge transport properties indicated that control of the native point defect is critical to achieve high thermoelectric performance in BiCuOTe material system.