| 1. |
- Zakeri, Fatemeh, et al.
(författare)
-
Al-Ce co-doped BaTiO3 nanofibers as a high-performance bifunctional electrochemical supercapacitor and water-splitting electrocatalyst
- 2024
-
Ingår i: Scientific Reports. - : Springer Nature. - 2045-2322. ; 14:1
-
Tidskriftsartikel (refereegranskat)abstract
- Supercapacitors and water splitting cells have recently played a key role in offering green energy through converting renewable sources into electricity. Perovskite-type electrocatalysts such as BaTiO3, have been well-known for their ability to efficiently split water and serve as supercapacitors due to their high electrocatalytic activity. In this study, BaTiO3, Al-doped BaTiO3, Ce-doped BaTiO3, and Al-Ce co-doped BaTiO3 nanofibers were fabricated via a two-step hydrothermal method, which were then characterized and compared for their electrocatalytic performance. Based on the obtained results, Al-Ce co-doped BaTiO3 electrode exhibited a high capacitance of 224.18 Fg−1 at a scan rate of 10 mVs−1, high durability during over the 1000 CV cycles and 2000 charge–discharge cycles, proving effective energy storage properties. Additionally, the onset potentials for OER and HER processes were 11 and − 174 mV vs. RHE, respectively, demonstrating the high activity of the Al-Ce co-doped BaTiO3 electrode. Moreover, in overall water splitting, the amount of the overpotential was 0.820 mV at 10 mAcm−2, which confirmed the excellent efficiency of the electrode. Hence, the remarkable electrocatalytic performance of the Al-Ce co-doped BaTiO3 electrode make it a promising candidate for renewable energy technologies owing to its high conductivity and fast charge transfer.
|
|
| 2. |
- Abdelaziz, Omar Y., et al.
(författare)
-
Recent strides toward transforming lignin into plastics and aqueous electrolytes for flow batteries
- 2024
-
Ingår i: iScience. - : Elsevier Inc.. - 2589-0042. ; 27:4
-
Forskningsöversikt (refereegranskat)abstract
- Lignin is an abundant polyaromatic polymer with a wide range of potential future uses. However, the conversion of lignin into valuable products comes at a cost, and medium- to high-value applications are thus appropriate. Two examples of these are polymers (e.g., as fibers, plasticizers, or additives) and flow batteries (e.g., as redox species). Both of these areas would benefit from lignin-derived molecules with potentially low molecular weight and high (electro)chemical functionality. A promising route to obtain these molecules is oxidative lignin depolymerization, as it enables the formation of targeted compounds with multiple functionalities. An application with high potential in the production of plastics is the synthesis of new sustainable polymers. Employing organic molecules, such as quinones and heterocycles, would constitute an important step toward the sustainability of aqueous flow batteries, and lignin and its derivatives are emerging as redox species, mainly due to their low cost and renewability.
|
|
| 3. |
- Rossini, Matteo, et al.
(författare)
-
High performance water electrolysis using a poly(fluorene phenylpropylammonium) anion-exchange membrane with 2 M aqueous KOH
- 2024
-
Ingår i: Journal of Materials Chemistry A. - 2050-7488. ; 12:21, s. 12826-12834
-
Tidskriftsartikel (refereegranskat)abstract
- Anion exchange membrane water electrolysis (AEMWE) has a great potential to be established as a high-performance and low-capital cost technology for hydrogen production. High current densities can be achieved with non-platinum group metal (non-PGM) catalyst. However, the harsh operation conditions require stable cell components. Here, we report on the use of a highly stable and ion conductive poly(fluorene alkylene) membrane (PdF-TMA) tethered with trimethylammonium cations via phenylpropyl side chains for AEMWEs operating with 2 M aqueous KOH. The ether-free PdF-TMA polymer is efficiently prepared by polyhydroxyalkylation to reach a molecular weight of 236 kDa, a high thermal stability, and an ion-exchange capacity of 2.14 mequiv. g-1 (OH− form). Using commercial electrodes of NiFe2O4 (anode) and Raney Nickel (cathode) and PdF-TMA as AEM, the output current reached 1 A cm-2 at below 1.9 V at 60 °C. Also, PdF-TMA outperformed AEMIONTM membrane resistance by almost 30% and, after 100 h at 0.5 A cm-2, did not reveal any loss of conductivity, contrary to AEMIONTM. Furthermore, both membranes were analysed by 1H NMR spectroscopy after AEMWE tests and the PdF-TMA proved very stable even at 80 °C.
|
|
