Cuprous sulfide derived CuO nanowires as effective electrocatalyst for oxygen evolution

Sun, Jinyong; Zhou, Hongbo; Song, Peng; Liu, Yuanjun; Wang, Xueyang; Wei, Tiange; Shen, Xiaoping; Chen, Peng; Zhu, Guoxing

doi:10.1016/j.apsusc.2021.149235

Cited by 33 publications

(24 citation statements)

References 45 publications

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“…Deconvolution of Cu 2p further identified the presence of Cu II along with Cu I in the as-prepared CuS, very similar to digenite Cu 9 S 5 . 25,63 Binding energy values of 933.65 (Cu 2p 3/2 ) and 952.78 eV (Cu 2p 1/2 ) are assigned to Cu II with a spin−orbit coupling value of 19.13 eV. 63 Small shake-up satellite peaks are also observed in between the two major peaks that further supported the presence of the Cu II (Figure S5a).…”

Section: ■ Results and Discussionmentioning

confidence: 86%

Electrochemically Derived Crystalline CuO from Covellite CuS Nanoplates: A Multifunctional Anode Material

et al. 2022

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In the present era, electrochemical water splitting has been showcased as a reliable solution for alternative and sustainable energy development. The development of a cheap, albeit active, catalyst to split water at a substantial overpotential with long durability is a perdurable challenge. Moreover, understanding the nature of surface-active species under electrochemical conditions remains fundamentally important. A facile hydrothermal approach is herein adapted to prepare covellite (hexagonal) phase CuS nanoplates. In the covellite CuS lattice, copper is present in a mixed-valent state, supported by two different binding energy values (932.10 eV for CuI and 933.65 eV for CuII) found in X-ray photoelectron spectroscopy analysis, and adopted two different geometries, that is, trigonal planar preferably for CuI and tetrahedral preferably for CuII. The as-synthesized covellite CuS behaves as an efficient electro(pre)catalyst for alkaline water oxidation while deposited on a glassy carbon and nickel foam (NF) electrodes. Under cyclic voltammetry cycles, covellite CuS electrochemically and irreversibly oxidized to CuO, indicated by a redox feature at 1.2 V (vs the reversible hydrogen electrode) and an ex situ Raman study. Electrochemically activated covellite CuS to the CuO phase (termed as CuSEA) behaves as a pure copper-based catalyst showing an overpotential (η) of only 349 (±5) mV at a current density of 20 mA cm–2, and the TOF value obtained at η349 (at 349 mV) is 1.1 × 10–3 s–1. A low R ct of 5.90 Ω and a moderate Tafel slope of 82 mV dec–1 confirm the fair activity of the CuSEA catalyst compared to the CuS precatalyst, reference CuO, and other reported copper catalysts. Notably, the CuSEA/NF anode can deliver a constant current of ca. 15 mA cm–2 over a period of 10 h and even a high current density of 100 mA cm–2 for 1 h. Post-oxygen evolution reaction (OER)-chronoamperometric characterization of the anode via several spectroscopic and microscopic tools firmly establishes the formation of crystalline CuO as the active material along with some amorphous Cu(OH)2 via bulk reconstruction of the covellite CuS under electrochemical conditions. Given the promising OER activity, the CuSEA/NF anode can be fabricated as a water electrolyzer, Pt(−)//(+)CuSEA/NF, that delivers a j of 10 mA cm–2 at a cell potential of 1.58 V. The same electrolyzer can further be used for electrochemical transformation of organic feedstocks like ethanol, furfural, and 5-hydroxymethylfurfural to their respective acids. The present study showcases that a highly active CuO/Cu(OH)2 heterostructure can be constructed in situ on NF from the covellite CuS nanoplate, which is not only a superior pure copper-based electrocatalyst active for OER and overall water splitting but also for the electro-oxidation of industrial feedstocks.

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Section: ■ Results and Discussionmentioning

confidence: 86%

Electrochemically Derived Crystalline CuO from Covellite CuS Nanoplates: A Multifunctional Anode Material

et al. 2022

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“…Recently, we also studied the electrocatalytic activity of Cu 2 S toward the OER. A bigger Tafel slope of >120 mV dec –1 was obtained with this copper-based catalyst . In contrast, CoS x catalysts usually show a relatively lower Tafel slope .…”

Section: Resultsmentioning

confidence: 74%

“…A bigger Tafel slope of >120 mV dec −1 was obtained with this copper-based catalyst. 73 In contrast, CoS x catalysts usually show a relatively lower Tafel slope. 61 The CuCo 2 S 4 nanosheets This value approaches that of the battery with the Pt/C + RuO 2 catalyst (1.45 V) (Figure 7b).…”

Section: Resultsmentioning

confidence: 99%

Molecular Precursor Route to CuCo₂S₄ Nanosheets: A High-Performance Pre-Catalyst for Oxygen Evolution and Its Application in Zn–Air Batteries

Zhang

Cheng

et al. 2021

Inorg. Chem.

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Development of high-efficiency non-precious metal-based electrocatalysts to drive the complex four-electron process of the oxygen evolution reaction (OER) is crucial for production of hydrogen and energy storage components. Herein, bimetallic CuCo2S4 nanosheets were created by a new molecular precursor route. The optimal CuCo2S4 catalyst demonstrates superior performance to catalyze the OER with excellent stability, which was confirmed by the low overpotential of 290 mV at 10 mA cm–2 in 1 M KOH. The catalytic activity can be maintained for at least 40 h. The catalyst after the OER was then detected. The results indicate that S-doped CoOOH/CuO nanosheets formed on the catalyst surface during the OER may act as the catalytic active substance. Furthermore, when employed as an air cathode in a Zn–air battery, it reveals a high open-cycle potential of 1.38 V and a peak power density of 123.9 mW cm–2. The performance of the rechargeable Zn–air battery is close to that fabricated with commercial precious metal-based electrocatalysts. These findings would furnish some guidelines for the design, development, and applications of bimetallic sulfide electrocatalysts for the OER.

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“…13−15 During the catalytic process, the catalyst surface was activated and involved in oxyhydroxides acting as the catalytic active phase. 16 Strategies including micro-/nanoscale morphology engineering and surface state tuning were developed to enhance the catalysis activity. 13−17 Complex compounds, especially the well-known metal− organic frameworks (MOFs), have attracted considerable attention in the field of energy nanomaterials.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In recent years, much attention has been paid to efficient but earth-abundant and low-cost catalyst materials . Compounds based on iron, cobalt, nickel (including phosphides and sulfides) have been investigated as precatalysts for OER. − During the catalytic process, the catalyst surface was activated and involved in oxyhydroxides acting as the catalytic active phase . Strategies including micro-/nanoscale morphology engineering and surface state tuning were developed to enhance the catalysis activity. − …”

Section: Introductionmentioning

confidence: 99%

In Situ Electrochemical Activation of Fe/Co-Based 8-Hydroxyquinoline Nanostructures on Copper Foam for Oxygen Evolution

Chen

Jia

Liu

et al. 2021

ACS Appl. Nano Mater.

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Oxygen evolution reaction (OER) is an important step in water splitting. However, it suffers from slow kinetics due to the multistep proton-coupled electron-transfer processes. Electrochemical activation is often used to obtain highly effective electrocatalysts with various precatalysts including sulfides and metal–organic frameworks, while details for the related phase transformation are often overlooked. Herein, micro-/nanoscale building blocks of Fe/Co-based 8-hydroxyquinoline compounds were loaded on a copper foam acting as a precatalytic electrode for oxygen evolution. The obtained precatalytic electrode can be activated in situ and shows an excellent catalytic activity for OER with an overpotential of 247 mV for 10 mA cm–2 in 1.0 M KOH. The phase transformation of the catalytic electrode during the OER operation was carefully investigated. The results would help the understanding of electrocatalyst activation and provide some hints for the development of advanced electrocatalysts.

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Cuprous sulfide derived CuO nanowires as effective electrocatalyst for oxygen evolution

Cited by 33 publications

References 45 publications

Electrochemically Derived Crystalline CuO from Covellite CuS Nanoplates: A Multifunctional Anode Material

Electrochemically Derived Crystalline CuO from Covellite CuS Nanoplates: A Multifunctional Anode Material

Molecular Precursor Route to CuCo₂S₄ Nanosheets: A High-Performance Pre-Catalyst for Oxygen Evolution and Its Application in Zn–Air Batteries

In Situ Electrochemical Activation of Fe/Co-Based 8-Hydroxyquinoline Nanostructures on Copper Foam for Oxygen Evolution

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Cuprous sulfide derived CuO nanowires as effective electrocatalyst for oxygen evolution

Cited by 33 publications

References 45 publications

Electrochemically Derived Crystalline CuO from Covellite CuS Nanoplates: A Multifunctional Anode Material

Electrochemically Derived Crystalline CuO from Covellite CuS Nanoplates: A Multifunctional Anode Material

Molecular Precursor Route to CuCo2S4 Nanosheets: A High-Performance Pre-Catalyst for Oxygen Evolution and Its Application in Zn–Air Batteries

In Situ Electrochemical Activation of Fe/Co-Based 8-Hydroxyquinoline Nanostructures on Copper Foam for Oxygen Evolution

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Molecular Precursor Route to CuCo₂S₄ Nanosheets: A High-Performance Pre-Catalyst for Oxygen Evolution and Its Application in Zn–Air Batteries