The recovery of expired ferrous gluconate and spent Li foils into high performance straw-bundle-like α-LiFeO2/C cathode

Microwave-Assisted Hydrothermal Synthesis of {100} and {111} Faceted LiFeO2 Truncated Octahedra: Investigations on Volatile Organic Compound Sensing Performance

“…The deconvoluted Li 1s spectrum using the Lorentzian–Gaussian function reveals the presence of two components. The higher binding energy component (56.9 eV) is related to the overlapping of the Fe 3+ state from the Fe 3p component, while the high-intensity lower binding energy (55.6 eV) is related to Li + , involved in the Li– O bond. , The Fe 2p spectrum in Figure c shows the two dominant main peaks of Fe 2p 1/2 (724.4 eV) and Fe 2p 3/2 (710.6 eV) and their corresponding satellite peaks at 733.3 and 719.6 eV, respectively. The deconvolution process shows the presence of the Fe 3+ state in LiFeO 2 . ,, As shown in Figure d, the O 1s spectrum is composed of three peaks at 532.9, 531.3, and 530.0 eV, which are labeled as O ads , O def , and O lat , respectively. , The O ads is usually associated with the chemisorbed or dissociated oxygen ions on the surface.…”

“…Detection of such compounds is directly related to the sensing material’s preparation, morphology, size, crystalline degree, and aspect ratio . LiFeO 2 is one such material and has been synthesized with various morphologies such as straw-bundle-like structure, nanoparticle clusters, nanocrystalline porous structure, 3D nanoarchitectures, and staghorn-coral-like 3D porous structure through various synthetic procedures. However, research into the growth of a faceted LiFeO 2 morphology and its sensing mechanism is lacking, and further study is required.…”

“…For example, Yang et al. compared the ethanol sensing of different faceted morphological α-Fe 2 O 3 , Lan et al showed the detection of acetone using WO 3 nanosheets with the {002} facet, Miao et al demonstrated the sensing of volatile organic compounds using SnO 2 nanoparticles with different {221} and {110} crystal facet percentages, Ouyang et al found that α-Fe 2 O 3 nanocrystals with {113}, {012}, and {001}/{012} faceted shapes possess different sensing responses to acetone and methanol, and Hermawan et al discussed the detection of NO x using octahedral NiO with the {111} facet . The different crystallographic facets possess distinctive surface energies, bonding, atomic arrangements, electronic structures, and chemical reactivities, which determine their intrinsic shape-dependent properties .…”