Stabilized Octahedral Frameworks in Layered Double Hydroxides by Solid-Solution Mixing of Transition Metals

Cited 66 time in webofscience Cited 0 time in scopus
  • Hit : 564
  • Download : 0
Pseudocapacitors have received considerable attention, as they possess advantages of both rechargeable batteries and electric double layer capacitors. Among various active materials for pseudocapacitors, alpha-layered double hydroxides (alpha-TM(OH)(2), TM = transition metal) are promising due to their high specific capacities. Yet, irreversible alpha-to-beta phase transitions of alpha-TM(OH)(2) hinder their long-term cyclability, particularly when the TM is nickel. Here, it is reported that binary TM ion mixing can overcome the limited cycle lives of alpha-TM(OH)(2) by stabilizing the octahedral frameworks of alpha-TM(OH)(2). In particular, an alpha-TM(OH)(2) with equal amounts of nickel and cobalt exhibits long-term capacity retention (89.0% after 2000 cycles) and specific capacity (206 mA h g(-1)), which are better than those of individual TM counterparts. A series of analyses reveals that the improved performances originate from the synergistic effects between the TM ions; the preferred trivalent state of cobalt ions stabilizes the octahedral framework by accommodating the detrimental Jahn-Teller distortion of Ni3+. The stabilized framework also widens the redox swing range of the nickel up to 4+, thus, increasing the specific capacity of the corresponding alpha-TM(OH)(2). This study indicates that proper mixing of TMs is a prolific approach in enhancing the vital properties of alpha-TM(OH)(2), a promising family of pseudocapacitor materials.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2017-02
Language
English
Article Type
Article
Keywords

ELECTROCHEMICAL CAPACITORS; NICKEL-HYDROXIDE; HIGH-PERFORMANCE; ENERGY-STORAGE; CRYSTAL WATER; SUPERCAPACITOR; ELECTRODES; NANOSHEETS; ALPHA-NI(OH)(2); BATTERIES

Citation

ADVANCED FUNCTIONAL MATERIALS, v.27, no.7

ISSN
1616-301X
DOI
10.1002/adfm.201605225
URI
http://hdl.handle.net/10203/223312
Appears in Collection
EEW-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 66 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0