Space-confined growth of Bi2Se3 nanosheets encapsulated in N-doped carbon shell lollipop-like composite for full/half potassium-ion and lithium-ion batteries

Iron Selenide‐Based Heterojunction Construction and Defect Engineering for Fast Potassium/Sodium‐Ion Storage

“…In Se3d spectrum (Figure 3f), the binding energies at 53.7 and 54.6 eV are related to selenide species. [15] And two obvious peaks located at 55.4 and 57.8 eV are assigned to SeSe and SeC, [3,5] Small 2022, 18, 2107252 respectively, confirming the Se doping and Se residue presence, which is in line with the Raman analysis (Figure 3c). The C1s spectrum could be resolved into four peaks situated at 284.7, 286.1, 287.9, and 289.6 eV corresponding to CC, CC, CO, and SeC, respectively.…”

“…The C1s spectrum could be resolved into four peaks situated at 284.7, 286.1, 287.9, and 289.6 eV corresponding to CC, CC, CO, and SeC, respectively. [5,13] In the N 1s spectrum, three peaks centered at 398.7, 400.1, and 402.6 eV indicated the existence of pyridinic-N, pyrrolic-N, and graphitic-N. [34] (Figure 3h) The peaks at 853.6 and 871.9 eV in the Ni 2p spectrum (Figure S6b, Supporting Information) belong to the Ni(II) species, which also confirmed that the Ni were successfully doped into the NF 11 S/C crystals. [6] The carbon content of NF 11 S/C is determined to be ≈50.61% via depth XPS.…”

“…[1][2][3][4] By virtue of the migration, achieving improved performance. [5,9,[27][28][29] 4) Defect engineering of the metal compound, such as hetero-atomic doping is a promising strategy to modulate lattice spacing and electronic structure of the anode materials, which enables rich lattice defects and active sites, benefiting for relief of volume effect and high capacity delivery. [6,9,30,31] The typical work is nickel-doped Sb 2 Se 3 nanorods designed by Yu and co-workers recently and superior performances as anode material for PIBs have been achieved.…”

“…DOI: 10.1002/smll.202107252 favorable features of low standard redox potential (K: −2.93 V and Na: −2.71 V vs the standard hydrogen electrode [SHE]), low cost and high reserves of K/Na, potassium-ion batteries (PIBs) and sodiumion batteries (SIBs) are considered as appealing alternatives to LIBs. [5][6][7][8] Nevertheless, their development is still subjected to serious problems, such as severe volume effect and slow reaction kinetics as a result of the large-sized K + /Na + , resulting in poor cycling stability upon ion insertion/emigration processes, although obvious progress has been achieved. [7,[9][10][11] Therefore, it is urgent to explore and design suitable anodes with long cycling stability and high capacity for the storage of K + /Na + .…”

In Situ Growth of CoS2/ZnS Nanoparticles on Graphene Sheets as an Ultralong Cycling Stability Anode for Potassium Ion Storage

“…However, the large atomic size of both sodium and potassium ions (1.02 for Na + , 1.38 Å) compared with that of lithium ions (0.76 Å) may cause sluggish redox kinetics and large volume expansion, resulting in the suppression of the rate capability and cycling performances. − Therefore, intensive research is required to develop suitable and stable electrode materials for both SIBs and PIBs. Currently, various potential electrode materials have been rationally designed for Na/K ion storage, such as carbonaceous materials, heteroatom-doped graphene, transition-metal oxides, transition-metal sulfides, , phosphides, − and selenides, , which are promising anode materials for SIBs and PIBs.…”