The interest in and need for carbon-free fuels that do not rely on fossil are constantly growing from both environmental energetic perspectives. Green hydrogen production is at the core of transition away conventional fuels. Along with popularly investigated pathways production, thermochemical water splitting using redox materials an interesting option utilizing thermal energy, as this approach...

Layered manganese oxides have been considerably studied toward sustainable sodium-ion battery materials. There has a focus on the specific roles of Cu as member substituents in sodium oxides. Herein, effects substitution for Mn P′2- and P2-type Na0.67[CuxMn1–x]O2 (0 ≤ x 0.33) are systematically investigated, focusing cooperative Jahn–Teller distortion Mn3+ Cu2+ ions. Na0.67[Cu0.2Mn0.8]O2 is sel...

Remarkable improvement in the polarization and charge transport at solid–solid electrode–electrolyte interface due to incorporation of a redox-active additive sodium molybdate (Na2MoO4) is demonstrated. The presence electrochemically active oxide center along with Na+ facilitates hopping-based ionic liquid leading higher conductivity twofold increase specific capacitance (0.009 0.018 F cm−2). T...

A Li-excess cation-disordered rocksalt oxide, Li1.2Nb0.2V0.6O2, with higher theoretical capacity than traditional stoichiometric and layered oxides, is synthesized tested as positive electrode materials for battery applications. Although Li1.2Nb0.2V0.6O2 cannot be by conventional calcination method, a single phase metastable oxide successfully high-energy mechanical milling. Electrode performan...

Aqueous electrochemical energy storage devices using potassium-ions as charge carriers are attractive due to their superior safety, lower cost and excellent transport properties compared to other alkali ions. However, the accommodation of potassium-ions with satisfactory capacity and cyclability is difficult because the large ionic radius of potassium-ions causes structural distortion and insta...

Porous MnO/C nanotubes are synthesized by a facile hydrothermal method followed by thermal annealing, and possess excellent cyclability and high rate capability as an anode for lithium ion batteries.

Cation-disordered rocksalt (DRX) materials have emerged as a class of novel high-capacity cathodes for Li-ion batteries. However, the commercialization DRX will require reducing their capacity decay, which has been associated with oxygen loss during cycling. Recent studies show that fluorination can effectively reduce and improve cycling stability; however, underlying atomic-scale mechanisms re...