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Interfacing CrOx and CuS for synergistically enhanced water oxidation catalysis.

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Title: Interfacing CrOx and CuS for synergistically enhanced water oxidation catalysis.
Authors: Shifa, Tofik Ahmed1 (AUTHOR) tofikahmed.shifa@unive.it, Gradone, Alessandro2 (AUTHOR), Yusupov, Khabib3 (AUTHOR), Ibrahim, Kassa Belay1 (AUTHOR), Jugovac, Matteo4 (AUTHOR), Sheverdyaeva, Polina Makarovna5 (AUTHOR), Rosen, Johanna3 (AUTHOR), Morandi, Vittorio2 (AUTHOR), Moras, Paolo5 (AUTHOR), Vomiero, Alberto1,6 (AUTHOR) alberto.vomiero@unive.it
Source: Chemical Engineering Journal. Feb2023:Part 1, Vol. 453, pN.PAG-N.PAG. 1p.
Subjects: Oxidation of water, Oxygen evolution reactions, Catalysis, Catalytic activity, Chemical synthesis, X-ray photoelectron spectroscopy, Charge transfer
Abstract: [Display omitted] • We interfaced CrOx with CuS on carbon fiber substrate whose junction deliver intriguing structural/electronic property. • The theoretical calculation proved that charges are mainly distributed between the CuS layer and the Cr 2 O 3. • The co-existence of CrOx and CuS triggered charge transfer at the interface. • The heterojunction gave rise to the advent of defects/low-coordinated central metal atom. • The presented methodology would guide subsequent works focused on altering the intrinsic properties of oxide-sulfide interface. The sluggish kinetics associated with the oxygen evolution reaction (OER) limits the sustainability of fuel production and chemical synthesis. Developing catalysts based on Earth abundant elements with a reasonable strategy could solve the challenge. Here, we present a heterostructure built from CrOx and CuS whose interface gives rise to the advent of new functionalities in catalytic activity. Using X-ray photoelectron and absorption spectroscopies, we identified the multiple oxidation states and low coordination number of Cr metal in CrOx-CuS heterostructure. Benefitting from these features, CrOx-CuS generates oxygen gas through water splitting with a low over potential of 190 mV vs RHE at a current density of 10 mA cm−2. The catalyst shows no evident deactivation after a 36-hours operation in alkaline medium. The high catalytic activity, inspired by first principles calculations, and long-time durability make it one of the most effective OER electrocatalysts. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:[Display omitted] • We interfaced CrOx with CuS on carbon fiber substrate whose junction deliver intriguing structural/electronic property. • The theoretical calculation proved that charges are mainly distributed between the CuS layer and the Cr 2 O 3. • The co-existence of CrOx and CuS triggered charge transfer at the interface. • The heterojunction gave rise to the advent of defects/low-coordinated central metal atom. • The presented methodology would guide subsequent works focused on altering the intrinsic properties of oxide-sulfide interface. The sluggish kinetics associated with the oxygen evolution reaction (OER) limits the sustainability of fuel production and chemical synthesis. Developing catalysts based on Earth abundant elements with a reasonable strategy could solve the challenge. Here, we present a heterostructure built from CrOx and CuS whose interface gives rise to the advent of new functionalities in catalytic activity. Using X-ray photoelectron and absorption spectroscopies, we identified the multiple oxidation states and low coordination number of Cr metal in CrOx-CuS heterostructure. Benefitting from these features, CrOx-CuS generates oxygen gas through water splitting with a low over potential of 190 mV vs RHE at a current density of 10 mA cm−2. The catalyst shows no evident deactivation after a 36-hours operation in alkaline medium. The high catalytic activity, inspired by first principles calculations, and long-time durability make it one of the most effective OER electrocatalysts. [ABSTRACT FROM AUTHOR]
ISSN:13858947
DOI:10.1016/j.cej.2022.139781