Foldable potassium-ion batteries enabled by free-standing and flexible SnS₂@C nanofibers

Abstract

Potassium-ion batteries (PIBs) have been regarded as promising alternatives to lithium-ion batteries in large-scale energy storage systems owing to the high abundance and low cost of potassium. However, the large...

Structural design and mechanism analysis of hierarchical porous carbon fibers for advanced energy and environmental applications

“…234–237 For boosting the performance of rechargeable metal-ion batteries, one of the most advanced characters of PCFs as anodes is their high metal storage capacity, including lithium, sodium and potassium. 238–245 The following mechanism has been widely proven using different forms of PCF, (1) their highly disordered carbon structure, rich defective voids and pores improve the capacitive adsorption of metal ions; (2) their typical one-dimensional structure with highly porous morphologies provides a short transport distance and diffusion pressure for ions; (3) PCFs can store metal ions in turbostratic and graphitic interlayers via intercalation, and metal clusters in micropores/voids by reversible plating/striping; (4) the hierarchical pores offer more opportunities to modify the structural and chemical properties of PCFs, which can further improve the storage capacity for metals. 17,246 For example, Kim's group synthesized and investigated the effect of PCFs on Li plating behavior.…”

Efficient and durable uranium extraction from uranium mine tailings seepage water via a photoelectrochemical method

“…These reflected the kinetics of the redox reactions ( Yuan et al., 2015a ). Linear relations between the reduction/oxidation peak current values and the square root of scanning rates were identified ( Figure S12 ), suggesting that both the reductive conversion and the oxidative conversion were diffusion-controlled reactions that could be described by the Randles-Sevcik model ( Yuan et al., 2015a ; Gao et al., 2017 ; Li et al., 2021 ). Fit with the Randles-Sevcik model, the CV data revealed a one-electron U(VI) reduction process on the Ti electrode (see Figure S14 ).…”

Photoelectrochemical uranium extraction from uranium mine tailings seepage water

“…These reflected the kinetics of the redox reactions 23 . Linear relations between the reduction/reduction peak current values and the square root of scanning rates were identified (Figure S12), suggesting that both the reductive conversion and the oxidative conversion were diffusion-controlled reactions that could be described by the Randles-Sevcik model [23][24][25] . Fit with the Randles-Sevcik model, the CV data revealed a one-electron U(VI) reduction process on the Ti electrode (see Supplementary Note 8 for details).…”