Pseudocapacitive storage via micropores in high-surface area molybdenum nitrides

Abdoulaye Djire; Jason B. Siegel; Olabode Ajenifujah; Lilin He; Levi T. Thompson

doi:10.1016/j.nanoen.2018.06.045

Pseudocapacitive storage via micropores in high-surface area molybdenum nitrides

Abdoulaye Djire, Jason B. Siegel, Olabode Ajenifujah, Lilin He, Levi T. Thompson

SANS & Spin Echo

Research output: Contribution to journal › Article › peer-review

42 Scopus citations

Abstract

Nanostructured early-transition-metal nitrides possess high capacitances that are consistent with a pseudocapacitive storage mechanism. Prior publications suggest that the mechanism involves the interactions between protons and the metal. This paper describes the use of in-situ small angle neutron scattering as a function of the potential applied to the electrode and ex-situ physical and electrochemical techniques to determine specific details regarding the storage mechanism for high-surface-area Mo nitride (γ-Mo₂N) in 0.1 mol dm⁻³ H₂SO₄ electrolyte. The results demonstrate that the pseudocapacitance involves a proton-coupled electron transfer (2e^- for every H⁺) via micropores, which is accompanied by the reduction/oxidation of Mo. These results suggest that capacitances in excess of 1500 Fg⁻¹ in 1.2 V could be achieved in aqueous acidic electrolytes.

Original language	English
Pages (from-to)	122-127
Number of pages	6
Journal	Nano Energy
Volume	51
DOIs	https://doi.org/10.1016/j.nanoen.2018.06.045
State	Published - Sep 2018

Funding

The authors acknowledge financial support from the Automotive Research Center, Army Tank Command and Army Research Office (grant number W911NF-11-1-0465), and Michigan Memorial Phoenix Project Seed grant. The SANS data were collected at the ORNL High Flux Isotope Reactor, sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy. The authors thank Dr. Jason Gaudet for his help with collecting the SANS data. The authors acknowledge financial support from the Automotive Research Center , Army Tank Command and Army Research Office (grant number W911NF-11-1-0465 ), and Michigan Memorial Phoenix Project Seed grant. The SANS data were collected at the ORNL High Flux Isotope Reactor, sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy. The authors thank Dr. Jason Gaudet for his help with collecting the SANS data.

Keywords

Micropores
Pseudocapacitance
Supercapacitors
Transition-metal molybdenum nitrides

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10.1016/j.nanoen.2018.06.045

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title = "Pseudocapacitive storage via micropores in high-surface area molybdenum nitrides",

abstract = "Nanostructured early-transition-metal nitrides possess high capacitances that are consistent with a pseudocapacitive storage mechanism. Prior publications suggest that the mechanism involves the interactions between protons and the metal. This paper describes the use of in-situ small angle neutron scattering as a function of the potential applied to the electrode and ex-situ physical and electrochemical techniques to determine specific details regarding the storage mechanism for high-surface-area Mo nitride (γ-Mo2N) in 0.1 mol dm−3 H2SO4 electrolyte. The results demonstrate that the pseudocapacitance involves a proton-coupled electron transfer (2e- for every H+) via micropores, which is accompanied by the reduction/oxidation of Mo. These results suggest that capacitances in excess of 1500 Fg−1 in 1.2 V could be achieved in aqueous acidic electrolytes.",

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T1 - Pseudocapacitive storage via micropores in high-surface area molybdenum nitrides

AU - Djire, Abdoulaye

AU - Siegel, Jason B.

AU - Ajenifujah, Olabode

AU - He, Lilin

AU - Thompson, Levi T.

PY - 2018/9

Y1 - 2018/9

N2 - Nanostructured early-transition-metal nitrides possess high capacitances that are consistent with a pseudocapacitive storage mechanism. Prior publications suggest that the mechanism involves the interactions between protons and the metal. This paper describes the use of in-situ small angle neutron scattering as a function of the potential applied to the electrode and ex-situ physical and electrochemical techniques to determine specific details regarding the storage mechanism for high-surface-area Mo nitride (γ-Mo2N) in 0.1 mol dm−3 H2SO4 electrolyte. The results demonstrate that the pseudocapacitance involves a proton-coupled electron transfer (2e- for every H+) via micropores, which is accompanied by the reduction/oxidation of Mo. These results suggest that capacitances in excess of 1500 Fg−1 in 1.2 V could be achieved in aqueous acidic electrolytes.

AB - Nanostructured early-transition-metal nitrides possess high capacitances that are consistent with a pseudocapacitive storage mechanism. Prior publications suggest that the mechanism involves the interactions between protons and the metal. This paper describes the use of in-situ small angle neutron scattering as a function of the potential applied to the electrode and ex-situ physical and electrochemical techniques to determine specific details regarding the storage mechanism for high-surface-area Mo nitride (γ-Mo2N) in 0.1 mol dm−3 H2SO4 electrolyte. The results demonstrate that the pseudocapacitance involves a proton-coupled electron transfer (2e- for every H+) via micropores, which is accompanied by the reduction/oxidation of Mo. These results suggest that capacitances in excess of 1500 Fg−1 in 1.2 V could be achieved in aqueous acidic electrolytes.

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Pseudocapacitive storage via micropores in high-surface area molybdenum nitrides

Abstract

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Keywords

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