Rational design of double perovskite La2Ni0.5Co0.5MnO6 decorated polyaniline array on MoO3 nanobelts with strong heterointerface boosting oxygen evolution reaction and urea oxidation

Maheskumar, V.; Govindan, Jagan; Park, Chang Min

doi:10.1016/j.apsusc.2022.155737

Cited by 15 publications

(4 citation statements)

References 71 publications

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“…The ECSA can be estimated using the following equation: ECSA = ( C dl / C s ) × A , where C s represents the specific capacitance of the CC (88 mF cm −2 ) and A denotes the active area of the electrode (cm 2 ). [ 11 ] The ECSA value of Ni/MNO‐10 (0.198 cm 2 ) is higher than 0.061, 0.093, and 0.118 cm 2 of Ni/NiO, Ni/MNO‐5, and Ni/MNO‐15, respectively. The long‐term durability of as‐synthesized catalysts is also an essential parameter for assessing their electrocatalytic performance.…”

Section: Resultsmentioning

confidence: 99%

“…[4,[6][7][8][9] Among the numerous anodic oxidation reactions, the urea oxidation reaction (UOR) has many advantages owing to its nontoxicity, low thermodynamic potential (0.37 V), ideal energy density (16.9 MJ L À1 ), and highly abundant urea. [10,11] UOR is also frequently used in urea-rich wastewater from human or animal urine, industry, and sanitation (the urea content is 0.33 M), which reduces electrons by concurrently recovering energy and facilitating sewage disposal. [12] Moreover, compared to the rising seawater oxidation, UOR can eschew the chlorine gas formation owing to its lower reaction potential than that of the chlorine evolution reaction (E o = 1.36 V).…”

Section: Introductionmentioning

confidence: 99%

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Modulating the Electronic Structure of Ni/NiO Nanocomposite with High‐Valence Mo Doping for Energy‐Saving Hydrogen Production via Boosting Urea Oxidation Kinetics

Maheskumar,

Min,

Moon

et al. 2023

Small Structures

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Electrocatalytic urea oxidation reaction (UOR) has emerged as a promising alternative to the anodic oxygen evolution reaction (OER) in water electrolysis. However, UOR faces challenges like slow kinetics, high energy barriers, and a complex mechanism, necessitating the development of efficient electrocatalysts. Herein, a rapid method is proposed for synthesizing Mo‐doped Ni/NiO (Ni/MNO) nanocomposite as a highly effective UOR electrocatalyst. Mo doping oxidizes Ni2+ to Ni3+, creating abundant active sites for UOR. The Ni/MNO catalyst exhibits remarkable activity for both OER and UOR due to Mo doping, structural modulation, increased active sites, and the presence of Ni3+ ions. Optimized Ni/MNO‐10 shows a low OER overpotential of 280 mV and a UOR working potential of 1.37 V versus reversible hydrogen electrode at 10 mA cm−2, with exceptional stability over 12 h of continuous electrolysis. Notably, urea‐assisted water splitting requires only 1.45 V for 10 mA cm−2, significantly less than the overall water splitting voltage (1.65 V), indicating energy‐efficient hydrogen production. Moreover, the Ni/MNO catalyst exhibits outstanding long‐term stability. This work presents a rapid and effective approach to synthesizing cost‐effective and efficient electrocatalysts for clean energy production and wastewater treatment.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modulating the Electronic Structure of Ni/NiO Nanocomposite with High‐Valence Mo Doping for Energy‐Saving Hydrogen Production via Boosting Urea Oxidation Kinetics

Maheskumar,

Min,

Moon

et al. 2023

Small Structures

Self Cite

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“…For example, platinum group metals such as Pt, Rh, Ru, and Ir, as well as Ni, can be used as a cocatalyst for hydrogen evolution [34,35]. Metal oxides such as Co, Fe, Ni, Mn, Ru, and Ir oxides are commonly used as oxygen production cocatalysts [34,36]. For the complete water splitting, systems based on graphitic carbon nitride with cocatalysts such as Pt-CoP/g-C 3 N 4 [37], Pt-PtO x -CoOx/g-C 3 N 4 [38], Rh-RhO x /g-C 3 N 4 [39], Pt-IrO 2 /g-C 3 N 4 [6], Pt/(K + -doped)g-C 3 N 4 [20], or Pt-CoP/g-C 3 N 4 [8] have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Pt-IrOx/g-C3N4 Photocatalysts for the Highly Efficient Overall Water Splitting under Visible Light

Sidorenko,

Topchiyan,

Saraev

et al. 2024

Catalysts

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Two series of bimetallic photocatalysts (0.5% Pt/0.01–0.5% IrOx/g-C3N4 and 0.1% Pt/0.01–0.1% IrOx/g-C3N4) were synthesized by the thermolysis of melamine cyanurate and a successive deposition of platinum and iridium labile complexes (Me4N)2[Pt2(μ-OH)2(NO3)8] and fac-[Ir(H2O)3(NO2)3. The synthesized photocatalysts were studied by a set of physicochemical analysis techniques. Platinum exists in two states, with up to 60% in metallic form and the rest in the Pt2+ state, while iridium is primarily oxidized to the Ir3+ state, which was determined by X-ray photoelectron spectroscopy (XPS). The specific surface area (SBET), which is determined by low-temperature nitrogen adsorption, ranges from 80 to 100 m2 g−1 and the band gap energy (Eg) value is in the range of 2.75–2.80 eV as found by diffuse reflectance spectroscopy (DRS). The activity of the photocatalysts was tested in the photocatalytic production of hydrogen from ultrapure water under visible light (λ = 400 nm). It was found that the splitting of water occurs with the formation of the stochiometric amount of H2O2 as an oxidation product. Two photocatalysts 0.5% Pt/0.01% IrOx/g-C3N4 and 0.1% Pt/0.01% IrOx/g-C3N4 showed the highest activity at 100 μmol h−1 gcat−1, which is among the highest in H2 production published for such systems.

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“…19 Among them, perovskite oxides with the typical ABO 3 structure are considered highly promising electrocatalysts, where A is generally a rare earth or alkali metal ion and B is a transition metal. [20][21][22][23] Also, the electrocatalytic activity of these catalysts can be improved by replacing the A-site/B-site metal ions to adjust their crystal structure and oxygen vacancy content [24][25][26] or by surface engineering to modify their surface performance. 27 He et al constructed amorphous Co(OH) 2 on the surface of Sr 2 Fe 1.5 Mo 0.5 O 6Àd perovskite oxide, which exhibited excellent HER/OER bifunctional properties in alkaline media due to the synergistic interaction between the Co(OH) 2 nanosheets and SFM nanowires, yielding a large electrochemical surface area, abundant oxygen vacancies and fast electron transfer.…”

Section: Introductionmentioning

confidence: 99%

Efficient perovskite oxide@CdS composite catalysts for hydrogen production from oilfield wastewater electrolysis

Cao,

Li,

et al. 2024

New J. Chem.

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Rational design of double perovskite La2Ni0.5Co0.5MnO6 decorated polyaniline array on MoO3 nanobelts with strong heterointerface boosting oxygen evolution reaction and urea oxidation

Cited by 15 publications

References 71 publications

Modulating the Electronic Structure of Ni/NiO Nanocomposite with High‐Valence Mo Doping for Energy‐Saving Hydrogen Production via Boosting Urea Oxidation Kinetics

Modulating the Electronic Structure of Ni/NiO Nanocomposite with High‐Valence Mo Doping for Energy‐Saving Hydrogen Production via Boosting Urea Oxidation Kinetics

Bimetallic Pt-IrOx/g-C3N4 Photocatalysts for the Highly Efficient Overall Water Splitting under Visible Light

Efficient perovskite oxide@CdS composite catalysts for hydrogen production from oilfield wastewater electrolysis

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