Selenium-doped copper oxide nanoarrays: Robust electrocatalyst for the oxygen evolution reaction with ultralow overpotential

Tabassum, Lamya; Tasnim, Habiba; Shubhashish, Shubhashish; Perera, Inosh; Bhosale, Tejas; Li, Meilin; March, Seth; Islam, Mohammad Khairul; Suib, Steven L.

doi:10.1016/j.apmt.2022.101485

Cited by 7 publications

(12 citation statements)

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“…The improved OER activity of the material is ascribed to an increased electrochemically active surface area (51 cm ECSA 2 ) and lowered charge transfer resistance (1.2 Ω/cm 2 ) of the material upon doping Fe. The TOF of Fe-doped CuS/CuO/CS was exceptionally high (0.68 s –1 at 300 mV) compared to the TOF reported for IrO 2 , which is only 0.05 s –1 at 300 mV. , Doping of Fe 3+ and Fe 2+ tunes the local atomic structure and creates defects in the matrix. The defect sites work as the active site for OH – adsorption and lead to the enhancement of OER activity.…”

Section: Discussionmentioning

confidence: 71%

“…The peak at 934 eV accompanied by two strong satellite peaks at 941.3 eV and 944 eV is the characteristic of Cu 2+ in CuO. 26,42,43 This oxidation to Cu 2+ during the OER process confirms the formation of reactive intermediates such as (oxy) hydroxide and oxide species during the OER. A comparison of the S 2p spectra of Fe−CuS/CuO/CS NA before (Figure 6d) and after (Figure S11d) the OER shows that the CuS content was decreased after the OER.…”

Section: Discussionmentioning

confidence: 74%

“…The TOF of Fe-doped CuS/CuO/CS was exceptionally high (0.68 s −1 at 300 mV) compared to the TOF reported for IrO 2 , which is only 0.05 s −1 at 300 mV. 26,44 Doping of Fe 3+ and Fe 2+ tunes the local atomic structure and creates defects in the matrix. The defect sites work as the active site for OH − adsorption and lead to the enhancement of OER activity.…”

Section: Discussionmentioning

confidence: 84%

“…The peaks at 932.5 eV and 933.0 eV can be attributed to CuS and CuO, respectively. , The O 1s XPS spectra can be deconvoluted into three peaks centered at 529.8, 531.4, and 532.9 eV. The peak at 529.8 eV represents lattice oxygen (O L ) in the copper oxide matrix . The peak at 531.4 eV is due to oxygen vacancies (O V ) in the metal oxide matrix .…”

Section: Resultsmentioning

confidence: 99%

“…The peak at 529.8 eV represents lattice oxygen (O L ) in the copper oxide matrix. 26 The peak at 531.4 eV is due to oxygen vacancies (O V ) in the metal oxide matrix. 27 The peak at 532.9 eV represents chemically adsorbed water molecules (O ads ) at the surface of the sample.…”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

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Facile Synthesis of Transition-Metal-Doped (Fe, Co, and Ni) CuS/CuO/CS Nanorod Arrays for Superior Electrocatalytic Oxygen Evolution Reaction

Tabassum

Islam

Perea

et al. 2022

ACS Appl. Energy Mater.

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Electrochemical water splitting is a promising way to produce sustainable, renewable, and clean H 2 fuel. The anodic half-reaction of electrochemical water splitting, oxygen evolution reaction (OER) lowers the overall efficiency of the system due to this four-electron process with sluggish reaction kinetics. The state-of-the-art catalysts for OER are based on precious metals (Ru and Ir). In this article, transition-metal-doped (Fe, Co, and Ni) CuS/CuO nanorod arrays on copper sheet (CS) substrates were synthesized for the first time via the facile solvothermal method, and the electrocatalytic activity of the synthesized material toward OER in alkaline media was investigated. Fe-doped CuS/CuO/CS showed superior electrochemical performance with an overpotential of only 340 mV at 10 mA/cm 2 current density. The OER performance of the material was compared with the state-ofthe-art catalyst for RuO 2 /CS. The overpotential of RuO 2 /CS was 320 mV at 10 mA/cm 2 current density which is only 20 mV lower than the state-of-the-art catalyst. The enhancement of the OER activity was obtained by valence regulation upon doping Fe 3+ and Fe 2+ into CuS/CuO/CS nanorod arrays (NAs). The charge transfer resistance was lowered from 10.2 Ω/cm 2 for pristine CuS/ CuO/CS NA to 1.2 Ω/cm 2 upon Fe doping. The electrochemically active surface area was increased from 36 to 51 cm ECSA 2 upon Fe doping. The Fe-doped CuS/CuO/CS shows an exceptionally high turnover frequency (TOF) of 0.68 s −1 . The catalyst was stable up to 1000 cycles of OER over 10 h. The increase in electrical conductivity, increase in electrochemically active surface area (ECSA), and creation of defect sites leading to preferential absorption of OH − upon Fe doping led to enhanced OER activity of Fe−CuS/ CuO/CS. This is the first report of an Fe-doped CuS/CuO/CS nanoarray that shows superior OER activity with high TOF and excellent stability.

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Section: Discussionmentioning

confidence: 71%

Section: Discussionmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

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