A novel synergistic confinement strategy for controlled synthesis of high-entropy alloy electrocatalysts

Li, Huining; Zhu, Han; Shen, Qikai; Huang, Shaoda; Lu, Shuanglong; Ma, Piming; Dong, Weifu; Du, Mingliang

doi:10.1039/d0cc07345h

Cited by 37 publications

(25 citation statements)

References 19 publications

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“…[ 23 ] A confinement strategy melt spinning method was recently reported for the synthesis of FeCoNiCuPd and FeCoNiSiB catalysts, respectively. [ 24,25 ] Conventional hydrothermal method was used to synthesize MnFeCoNiCu catalyst. [ 26 ] In summary, to obtain HEA particles, mechanical alloying is a simple, conventional method.…”

Section: Introductionmentioning

confidence: 99%

Sputter‐Deposited High Entropy Alloy Thin Film Electrocatalyst for Enhanced Oxygen Evolution Reaction Performance

Lin

et al. 2022

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Thin film catalysts, giving a different morphology, provide a significant advantage over catalyst particles for the gas evolution reaction. Taking the advantages of sputter deposition, a high entropy alloy (HEA) thin film electrocatalyst is hereby reported for the oxygen evolution reaction (OER). The catalyst characteristics are investigated not only in its as‐deposited state, but also during and after the OER. For comparison, unary, binary, ternary, and quaternary thin film catalysts are prepared and characterized. The surface electronic structure modification due to the addition of a metal is studied experimentally and theoretically using density functional theory calculation. It is demonstrated that sputtered FeNiMoCrAl HEA thin film exhibits OER performance superior to all the reported HEA catalysts with robust electrocatalytic activity having a low overpotential of 220 mV at 10 mA cm–2, and excellent electrochemical stability at different constant current densities of 10 and 100 mA cm–2 for 50 h. Furthermore, the microstructure transformation is investigated during the OER, which is important for the understanding of the OER mechanism provided by HEA electrocatalyst. Such a finding will contribute to future catalyst design.

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Section: Introductionmentioning

confidence: 99%

Sputter‐Deposited High Entropy Alloy Thin Film Electrocatalyst for Enhanced Oxygen Evolution Reaction Performance

Lin

et al. 2022

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“…This multimetal uniform blending feature (Figure 3f−l) in combination with the XRD study (Figure 2a) elucidates that the nanoparticles grafted in NCNTs are high-entropy alloys by nature and mainly crystallize in the fcc phase. 11,17,27 The elemental analysis further indicates the comparatively lower Cr content. In this regard, we have studied the effect of varying the content of Cr, in the precursor, on the resultant nature of encapsulated nanoparticles (Figure S4).…”

Section: ■ Results and Discussionmentioning

confidence: 98%

“…This type of oxidation state in carbon−HEA nanoparticle composites has been observed previously. 11 The representative bright-field transmission electron microscopy (TEM, Figure 3a) and high-angle annular dark-field scanning TEM (HAADF-STEM, Figures 3b and S3) images display the HEA nanoparticle-grafted NCNTs. A randomly selected group of nanoparticles, marked by the yellow box in Figure 3b, is subjected to dedicated HAADF-STEM imaging (Figure 3c) and elemental partitioning using energy-dispersive spectroscopy (EDS) in STEM mode.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

FeCoNiMnCr High-Entropy Alloy Nanoparticle-Grafted NCNTs with Promising Performance in the Ohmic Polarization Region of Fuel Cells

Nandan

Raj

2022

ACS Appl. Mater. Interfaces

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We report a user-friendly methodology for the successful designing of targeted single-phased face-centered cubic (fcc) FeCoNiMnCr high-entropy alloy (HEA) nanoparticle-grafted N-doped carbon nanotubes (CNTs). The nanostructure assimilates the advantages of N-doped carbon and HEA nanoparticles as a core for the efficient promotion of electrochemical oxygen reduction reaction (ORR). It emulates the commercial Pt–C electrocatalyst for ORR and shows promise for better performance in the Ohmic polarization region of fuel cells. In addition, it ensures superior efficacy over those of numerous recently reported transition metal-based traditional alloy composites for ORR. The presented methodology has the potential to pave the way for the effective designing of a variety of targeted HEA systems with ease, which is necessary to widen the domain of HEA for numerous applications.

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“…[4,5] With the availability of such an immense range of possible adsorption energies, optimization of the composition allows for increasing the number of active sites with favorable adsorption energy for specific reactions of interest, and thus, to derive the optimal choice of elemental compositions and their respective ratio, ultimately leading to highly active electrocatalysts. [4,6] CSS electrocatalysts for energy conversion reactions such as the hydrogen evolution reaction, [7,8] the oxygen reduction reaction (ORR), [6,9] the oxygen evolution reaction, [10][11][12][13] the carbon dioxide reduction reaction [14] were investigated. CSS electrocatalysts are inherently complex, leading to challenges for a fundamental understanding of how they catalyze reactions and to develop standards for activity determination.…”

Section: Introductionmentioning

confidence: 99%

Zooming‐in – Visualization of active site heterogeneity in high entropy alloy electrocatalysts using scanning electrochemical cell microscopy

Tetteh

Banko

Krysiak

et al. 2021

Electrochemical Science Adv

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Complex solid solutions (“high entropy alloys” with a single solid‐solution phase) hold great promise in electrocatalysis because of their nearly unlimited number of different active sites exposed at the surface. It has been shown by theoretical studies that multiple arrangements of different elements directly neighboring a binding site create millions of differently active catalytic sites. We report a zooming‐in approach using scanning electrochemical cell microscopy (SECCM) to distinguish between the averaged electrochemical response of multiple active sites and active site‐specific electrochemical response. Using a thin film complex solid solution electrocatalyst and a range of SECCM single barrel capillaries with diameters from 1.2 µm to 50 nm, we observed an averaged electrochemical response for the oxygen reduction reaction with minor statistical variations for the larger capillary diameters. In contrast, significant statistical heterogeneity among the measured spots is observed for small capillary diameters. This statistical heterogeneity is attributed to the ability of the smaller probe size to address a comparatively smaller number of active sites with high or low activity dominating the measured electrocatalytic currents.

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A novel synergistic confinement strategy for controlled synthesis of high-entropy alloy electrocatalysts

Abstract: We report a synergistic confinement strategy for high-entropy alloys nanoparticles (HEA-NPs) synthesis. The carbon nitride substrate and polydopamine coating layer synergistically confine the NPs growth and contribute to the homogeneous...

Cited by 37 publications

References 19 publications

Sputter‐Deposited High Entropy Alloy Thin Film Electrocatalyst for Enhanced Oxygen Evolution Reaction Performance

Sputter‐Deposited High Entropy Alloy Thin Film Electrocatalyst for Enhanced Oxygen Evolution Reaction Performance

FeCoNiMnCr High-Entropy Alloy Nanoparticle-Grafted NCNTs with Promising Performance in the Ohmic Polarization Region of Fuel Cells

Zooming‐in – Visualization of active site heterogeneity in high entropy alloy electrocatalysts using scanning electrochemical cell microscopy

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