Robust and promising hydrogen and oxygen evolution reactions by a nanostructured bifunctional FeCoPd alloy electrocatalyst

Kumar, Ankur; Guha, Ankur Kanti; Das, Manash R.; Deka, Sasanka

doi:10.1039/d2ta04436f

Cited by 18 publications

(19 citation statements)

References 70 publications

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“…The inverted burette method was used to measure the amount of generated oxygen volumetrically during this time interval. The calculated amount was compared to the actually generated amount, and the Faraday efficiency was found to be about 87% (Figure f; see the Supporting Information for the equation) …”

Section: Results and Discussionmentioning

confidence: 99%

“…The calculated amount was compared to the actually generated amount, and the Faraday efficiency was found to be about 87% (Figure 5f; see the Supporting Information for the equation). 58 On the basis of the experimental evidence on this novel electrocatalyst and its superior OER rate, a mechanistic study is also performed. On the basis of literature reports and considering *OH and/or *O and/or *OOH is/are the adsorption species on the single active sites in alkaline condition, the following mechanism steps are considered for OER: 6,49 M OH MOH e + +…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Robust and Promising Electrocatalytic Oxygen Evolution Reaction by Activated Cu–Co–B Amorphous Nanosheets

Kumar

Muhommad

Guha

et al. 2023

ACS Sustainable Chem. Eng.

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The challenge to develop a highly efficient and affordable electrocatalyst for the oxygen evolution reaction (OER) could be fulfilled by a newly developed transition metal boron amorphous alloy electrocatalyst. This could successfully improve the overall efficiency of the electrochemical water splitting. Herein, we demonstrate the development of an entirely new Cu−Co−B amorphous alloy nanosheet (NS), which can act as an industrially promising electrocatalyst for the OER. Among a series of studied compositions, surface activated CuCo 2 B NSs with 5−6 nm thickness offer highly promising OER performances with an exceptionally high current density of 1000 mA cm −2 at 270 mV of overpotential (η) in a 1.0 M KOH electrolyte. It can also afford η 100 = 204 mV and η 500 = 256 mV, which remains intact for 60 h, with the lowest Tafel slope and charge transfer resistance and the highest electrochemically active sites with a promising turnover frequency and 87% Faradaic efficiency. It also fulfills the commercial requirement criteria of the OER process in 30 wt % KOH. Extensive experimental analyses led to a Cu−Co synergistic-based mechanism by the in situ formed active sites for the adsorption of *OH and *OOH reaction species, reconstruction of the catalyst surface by forming a metal hydroxides/oxyhydroxides precatalyst, modulation of electronic structure due to the rich defect nature, and topological disorder of the amorphous catalyst. Density functional theory (DFT) studies reveal that CuCo 2 B NSs are the most promising candidates for OER due to the lowest barrier for OER and thus the lowest adsorption energies, and the Cu-centers effectively and synergistically enhance the OER.

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Section: Results and Discussionmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Robust and Promising Electrocatalytic Oxygen Evolution Reaction by Activated Cu–Co–B Amorphous Nanosheets

Kumar

Muhommad

Guha

et al. 2023

ACS Sustainable Chem. Eng.

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“…Several new classes of compounds have emerged as efficient electrocatalysts for oxygen evolution reactions. Recently, there has been comprehensive research on the transition metal-based electrocatalysts including Fe, Co, Ni, Zn, and Cu for use in OER. − In recent years, transition metal-based layered double hydroxides (LDHs) have garnered attention for their potential use in energy conversion and storage due to their excellent catalytic performance in oxygen evolution reactions. Prior to the discovery of LDHs, other layered structures such as NiO/NiOOH, Fe(OH) 2 /FeOOH, NiCo 2 O 4 , and NiFe 2 O 4 were found to have good oxygen evolution reaction performance in alkaline media.…”

Section: Introductionmentioning

confidence: 99%

Copper-Doped Cobalt Oxychloride for Efficient Oxygen Evolution Reactions in an Alkaline Medium

Shamraiz

Badshah

Ain

2023

ACS Appl. Energy Mater.

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The development of cost-effective and stable cobalt-based electrodes for oxygen evolution reaction (OER) from water at a lower overpotential is a major challenge. In this work, we report the fabrication of cobalt-based oxychlorides and their substitution with copper to enhance stability and improve OER activity. The substation of Cu not only affects the overpotential but also suppresses the in situ conversion of Co 2+ into Co 3+ in an electrochemical environment. The synthesized material is characterized by powder X-ray diffraction, transmission electron microscopy, energy-dispersive X-ray mapping, and X-ray photoelectron spectroscopy (XPS) analyses. The Cu•Co 2 (OH) 3 Cl requires an overpotential of 230 mV to obtain a current density of 10 mA cm −2 and a Tafel slope of merely 53 mV dec −1 . Moreover, the binding energy of Co 2p in XPS is slightly shifted toward lower binding energy values due to the alteration of the cation distribution at the lattice when Cu 2+ replaces Co 2+ .

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“…17,18 Kumar et al have shown that polyhedral FeCoPd NPs with octahedral and cuboctahedral shapes should expose 111 and 100 facets for an effective catalytic reaction when crystallized in a Pd-fcc structure. 10 Wang et al have experimentally demonstrated that the exceptional HER activity of mesoporous Au/Rh core−shell nanowires is mostly a result of the improved electronic structure, which has increased active surface areas and optimized intermediate adsorption energies on catalysts. 19 Duan et al have shown that Rh 2 P nanocrystals with P-rich surfaces exhibit outstanding catalytic activity for the electrochemical HER in acidic media.…”

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confidence: 99%

“…Among them, the most promising, environmentally friendly, and environmentally sustainable method of producing hydrogen and oxygen is known as the electrocatalytic water-splitting reaction. , Water is electrolyzed using two half-cell processes, the HER and the OER, which take place at the cathode and anode, respectively . Multiple electron-coupled transfer processes were used in these reactions, which require highly active catalysts to reduce the significant overpotential given by electrocatalysis . An excellent catalyst must operate admirably in terms of the HER with the lowest overpotential and highest stability.…”

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confidence: 99%

Unraveling the Role of Orbital Interaction in the Electrochemical HER of the Trimetallic AgAuCu Nanobowl Catalyst

Biswas

Dastider

Ahmed

et al. 2023

J. Phys. Chem. Lett.

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Unraveling the origins of the electrocatalytic activity of composite nanomaterials is crucial but inherently challenging. Here, we present a comprehensive investigation of the influence of different orbitals’ interaction in the AuAgCu nanobowl model electrocatalyst during the hydrogen evolution reaction (HER). According to our theoretical study, AgAuCu exhibits a lower energy barrier than AgAu and AgCu bimetallic systems for the HER, suggesting that the trimetallic AgAuCu system interacts optimally with H*, resulting in the most efficient HER catalyst. As we delve deeper into the HER activity of AgAuCu, it was observed that the presence of Cu allows Au to adsorb the H* intermediate through the hybridization of s orbitals of hydrogen and s, d x 2 –y 2, and d z 2 orbitals of Au. Such orbital interaction was not present in the cases of AgAu and AgCu bimetallic systems, and as a result, these bimetallic systems exhibit lower HER activities.

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Robust and promising hydrogen and oxygen evolution reactions by a nanostructured bifunctional FeCoPd alloy electrocatalyst

Abstract: Herein, we developed trimetallic FeCoPd polyhedral alloy nanoparticles (NPs) as a new highly efficient and promising bifunctional electrocatalyst for hydrogen and oxygen evolution reaction (HER, OER). The as-synthesized polyhedral NPs...

Cited by 18 publications

References 70 publications

Robust and Promising Electrocatalytic Oxygen Evolution Reaction by Activated Cu–Co–B Amorphous Nanosheets

Robust and Promising Electrocatalytic Oxygen Evolution Reaction by Activated Cu–Co–B Amorphous Nanosheets

Copper-Doped Cobalt Oxychloride for Efficient Oxygen Evolution Reactions in an Alkaline Medium

Unraveling the Role of Orbital Interaction in the Electrochemical HER of the Trimetallic AgAuCu Nanobowl Catalyst

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