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Cationically Substituted Bi0.7Fe0.3OCl Nanosheets as Li Ion Battery Anodes
journal contribution
posted on 2017-04-07, 00:00 authored by Yoon Myung, Jaewon Choi, Fei Wu, Sriya Banerjee, Eric H. Majzoub, Jaewon Jin, Seung Uk Son, Paul V. Braun, Parag BanerjeeCation substitution
of Bi3+ with Fe3+ in
BiOCl leads to the formation of ionically layered Bi0.7Fe0.3OCl nanosheets. The synthesis follows a hydrolysis
route using bismuth(III) nitrate and iron(III) chloride, followed
by postannealing at 500 °C. Room temperature electrical conductivity
improves from 6.11 × 10–8 S/m for BiOCl to
6.80 × 10–7 S/m for Bi0.7Fe0.3OCl. Correspondingly, the activation energy for electrical
conduction reduces from 862 meV for pure BiOCl to 310 meV for Bi0.7Fe0.3OCl. These data suggest improved charge
mobility in Bi0.7Fe0.3OCl nanosheets. Density
functional theory calculations confirm this behavior by predicting
a high density of states near the Fermi level for Bi0.7Fe0.3OCl. The improvement in electrical conductivity is
exploited in the electrochemical performance of Bi0.7Fe0.3OCl nanosheets. The insertion capacity of Li+ ions shows an increase of 2.5×, from 215 mAh·.g–1 for undoped BiOCl to 542 mAh·g–1 for Bi0.7Fe0.3OCl after 50 cycles at a current density
of 50 mA·g–1. Thus, the direct substitution
of Bi3+ sites with Fe3+ in BiOCl results in
nanosheets of an ionically layered ternary semiconductor compound
which is attractive for Li ion battery anode applications.
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50 cyclesCationically Substituted Bi 0.7 Fe 0.3 OCl NanosheetsLi Ion Battery Anodes Cation substitutiontheory calculationsternary semiconductor compoundFermi levelelectrochemical performancehydrolysis route310 meVBi 0.7 Fe 0.3 OCl nanosheetsundoped BiOClcharge mobility862 meVLi ion battery anode applicationsinsertion capacityBiOCl resultsBi 0.7 Fe 0.3 OClroom temperatureactivation energy
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