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Download fileInvigorating the Catalytic Activity of Cobalt Selenide via Structural Phase Transition Engineering for Lithium–Oxygen Batteries
journal contribution
posted on 25.03.2020, 14:35 authored by Minglu Li, Chaozhu Shu, Anjun Hu, Jiabao Li, Ranxi Liang, Jianping LongFor
the purpose of reducing kinetic obstacles of the oxygen evolution
reaction and oxygen reduction reaction in rechargeable lithium–oxygen
(Li–O2) batteries, there is an urgent need for cost-effective
and durable high-efficiency electrocatalysts. Descriptors of catalytic
activity, local coordination environments, and electronic structures
of transition-metal dichalcogenides can be modulated via phase transition
engineering. Here, we report the strategy to induce transition of
CoSe2 from the cubic phase to the orthorhombic phase via
phosphorus doping. The weak electronegativity of phosphorus as compared
to selenium is beneficial for adjusting the amount of d electrons
on the Co cation and thus has a significant contribution to structural
phase transition and the electrocatalytic activity. As a result, the
Li–O2 battery with the phosphorus-doped orthogonal
phase CoSe2 (o-CoSe2|P) electrode exhibits excellent
rate capability (with a low overpotential of only 0.44 V at the current
density of 50 mA g–1) and cyclability (500 cycles).
These experimental results prove that phase transition engineering
is an effective strategy for obtaining highly efficient catalysts.
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Keywords
phase transition engineeringCo cation0.44 Velectrode exhibitsphosphorus dopingrate capabilityoxygen reduction reactionhigh-efficiency electrocatalystsoxygen evolution reactionCoSe 2Structural Phase Transition Engineeringphase transitionCobalt Selenidetransition-metal dichalcogenidesphosphorus-doped orthogonal phase CoSe 2Catalytic Activitycoordination environmentselectrocatalytic activity