Hybridized bimetallic phosphides of Ni–Mo, Co–Mo, and Co–Ni in a single ultrathin-3D-nanosheets for efficient HER and OER in alkaline media

Kandel, Mani Ram; Pan, Uday Narayan; Paudel, Dasu Ram; Dhakal, Purna Prasad; Kim, Nam Hoon; Lee, Joong Hee

doi:10.1016/j.compositesb.2022.109992

Cited by 110 publications

(41 citation statements)

References 67 publications

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“…It is well known that if the Tafel slope value of any catalyst is equal to or less than 30 mV dec −1 then the Volmer–Tafel mechanism is followed and if the Tafel slope value equals or is greater than 30 mV dec −1 then the Volmer–Heyrovsky mechanism is followed. Based on that the Volmer–Heyrovsky HER mechanism over Ni–Fe–Mn–P/NC@NF and for other respective materials has been confirmed by specifying the Tafel slope values as shown in Table S2, ESI † 29,46,58. H 2 O + e − − OH − → H ads (Volmer step)H ads + H 2 O + e − − OH − → H 2 (Heyrovsky step)…”

Section: Resultsmentioning

confidence: 71%

A hybrid trimetallic–organic framework-derived N, C co-doped Ni–Fe–Mn–P ultrathin nanosheet electrocatalyst for proficient overall water-splitting

et al. 2022

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Section: Resultsmentioning

confidence: 71%

A hybrid trimetallic–organic framework-derived N, C co-doped Ni–Fe–Mn–P ultrathin nanosheet electrocatalyst for proficient overall water-splitting

et al. 2022

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“…Usually, the value of overvoltage (ΔE = E j=10 −E 1/2 ) is used to evaluate efficiency loss, which can validly indicate the bifunctional electrocatalytic activity of the catalyst [ 49 ]. A smaller ΔE value indicates a lower efficiency loss and higher catalytic activity as a reversible oxygen electrode [ 67 , 74 ]. The as-prepared NG-CoFe/Mo 2 C-800 catalyst exhibits excellent catalytic activity with a ΔE of 0.67 V ( Figure 11 c).…”

Section: Resultsmentioning

confidence: 99%

CoFe Alloy-Coupled Mo2C Wrapped by Nitrogen-Doped Carbon as Highly Active Electrocatalysts for Oxygen Reduction/Evolution Reactions

et al. 2023

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Molybdenum carbide (Mo2C) with a Pt-like d-band electron structure exhibits certain activities for oxygen reduction and evolution reactions (ORR/OER) in alkaline solutions, but it is questioned due to its poor OER stability. Combining Mo2C with transition metals alloy is a feasible way to stabilize its electrochemical activity. Herein, CoFe-Prussian blue analogues are used as a precursor to compound with graphitic carbon nitride and Mo6+ to synthesize FeCo alloy and Mo2C co-encapsulated N-doped carbon (NG-CoFe/Mo2C). The morphology of NG-CoFe/Mo2C (800 °C) shows that CoFe/Mo2C heterojunctions are well wrapped by N-doped graphitic carbon. Carbon coating not only inhibits growth and agglomeration of Mo2C/CoFe, but also enhances corrosion resistance of NG-CoFe/Mo2C. NG-CoFe/Mo2C (800 °C) exhibits an excellent half-wave potential (E1/2 = 0.880 V) for ORR. It also obtains a lower OER overpotential (325 mV) than RuO2 due to the formation of active species (CoOOH/β-FeOOH, as indicated by in-situ X-ray diffraction tests). E1/2 shifts only 6 mV after 5000 ORR cycles, while overpotential for OER increases only 19 mV after 1000 cycles. ORR/OER performances of NG-CoFe/Mo2C (800 °C) are close to or better than those of many recently reported catalysts. It provides an interfacial engineering strategy to enhance the intrinsic activity and stability of carbides modified by transition-metals alloy for oxygen electrocatalysis.

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“…[4] Consequently, the OER activities have received more attention from many theoretical and experimental researchers, devoting many efforts to improving the OER activities. The electrocatalyst can accelerate the reaction kinetics of OER and reduce energy requirements in the water-splitting process, [5] which is the focus of electrocatalytic water-splitting research. To date, iridium oxide (IrO 2 ) and ruthenium oxide (RuO 2 ) have been regarded as OER benchmark electrocatalysts in water splitting, which are identified as the most efficient electrocatalysts for OER.…”

Section: Introductionmentioning

confidence: 99%

Tuning Electronic Structure of CuCo₂O₄ Spinel via Mn‐Doping for Enhancing Oxygen Evolution Reaction

Qiao

et al. 2022

ChemElectroChem

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Cobalt-based spinel oxide is a promising electrocatalyst for oxygen evolution reaction (OER) because of its low cost, excellent activity and stability. Herein, we designed the CuMn x Co 2 O 4 electrocatalyst with tunable electronic structure via Mn-doping to enhance OER performance. Results showed that the CuMn 0.5 Co 2 O 4 catalyst prepared by calcined at 600°C exhibited high crystalline without impurity phase, and possessed the enhanced Co 2 + /Co 3 + ratio and high concentration of oxygen vacancies, which were facilitated to enhance OER performance. Electrochemical test results showed the CuMn 0.5 Co 2 O 4 catalyst had high OER performance with a low overpotential of 340 mV at the current density of 10 mA • cm À 2 and a smaller Tafel slope of 69.8 mV • dec À 1 . TOF and ECSA results illustrated that the more intrinsic catalytic activity on the CuMn 0.5 Co 2 O 4 catalyst. After 1000 cycles, the catalyst exhibited high stability with the 8 1.7 % of current retention rate. The OER activity enhancement mechanism of was further analyzed, which were mainly ascribed to the conversion of variable Co 2 + / Co 3 + and enhanced oxygen vacancies.

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Hybridized bimetallic phosphides of Ni–Mo, Co–Mo, and Co–Ni in a single ultrathin-3D-nanosheets for efficient HER and OER in alkaline media

Cited by 110 publications

References 67 publications

A hybrid trimetallic–organic framework-derived N, C co-doped Ni–Fe–Mn–P ultrathin nanosheet electrocatalyst for proficient overall water-splitting

A hybrid trimetallic–organic framework-derived N, C co-doped Ni–Fe–Mn–P ultrathin nanosheet electrocatalyst for proficient overall water-splitting

CoFe Alloy-Coupled Mo2C Wrapped by Nitrogen-Doped Carbon as Highly Active Electrocatalysts for Oxygen Reduction/Evolution Reactions

Tuning Electronic Structure of CuCo₂O₄ Spinel via Mn‐Doping for Enhancing Oxygen Evolution Reaction

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Hybridized bimetallic phosphides of Ni–Mo, Co–Mo, and Co–Ni in a single ultrathin-3D-nanosheets for efficient HER and OER in alkaline media

Cited by 110 publications

References 67 publications

A hybrid trimetallic–organic framework-derived N, C co-doped Ni–Fe–Mn–P ultrathin nanosheet electrocatalyst for proficient overall water-splitting

A hybrid trimetallic–organic framework-derived N, C co-doped Ni–Fe–Mn–P ultrathin nanosheet electrocatalyst for proficient overall water-splitting

CoFe Alloy-Coupled Mo2C Wrapped by Nitrogen-Doped Carbon as Highly Active Electrocatalysts for Oxygen Reduction/Evolution Reactions

Tuning Electronic Structure of CuCo2O4 Spinel via Mn‐Doping for Enhancing Oxygen Evolution Reaction

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Tuning Electronic Structure of CuCo₂O₄ Spinel via Mn‐Doping for Enhancing Oxygen Evolution Reaction