High volumetric energy density capacitors based on new electrode material lanthanum nitride

Zhang, Wei-Bin, Ma, Xue-Jing, Loh, Adeline, Li, Xiaohong, Walsh, Frank and Kong, Lin-Bin (2017) High volumetric energy density capacitors based on new electrode material lanthanum nitride. ACS Energy Letters, 336-341. (doi:10.1021/acsenergylett.6b00636).

Abstract

LaN is synthesized via calcining La2O3 in NH3 and studied as capacitive material for energy storage. A volumetric capacitance of 951.3 F cm–3 was found in 1 mol dm–3 Na2SO4 using a current density of 1 A g–1, with less than 1% loss of capacitance being experienced after 5000 cycles. In addition, 87.3% of the initial capacitance remained at a current density of 10 A g–1. LaN exhibits high capacitance that is attributed to subsurface space charge accumulation with a possible electric double-layer capacitor component. A reversible electrode process ensures long cycle life and favorable electrical charge transfer. The assembled LaN symmetrical capacitor showed high volumetric energy densities, facilitating high-duty applications.

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