De-alloyed ternary electrocatalysts with high activity and stability for oxygen reduction reaction

Xiao, Zhuojie; Jiang, Yangcheng; Wu, Hao; Zhong, Huichi; Song, Huiyu; Abdelhafiz, Ali; Zeng, Jianhuang

doi:10.1016/j.jallcom.2021.160221

Cited by 24 publications

(17 citation statements)

References 59 publications

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“…An enriched Pt shell was also formed when dealloying PtCuFe nanoparticles supported on carbon (Table , entries 4–7) . All the electrocatalysts showed mass activities about 2–3 times higher than the pristine samples and commercial Pt 3 Co/C electrode (Table , entry 48).…”

Section: Applications Of Dealloyed Materialsmentioning

confidence: 97%

“…An enriched Pt shell was also formed when dealloying PtCuFe nanoparticles supported on carbon (Table 2, entries 4−7). 135 All the electrocatalysts showed mass activities about 2−3 times higher than the pristine samples and commercial Pt 3 Co/C electrode (Table 2, entry 48). The dealloyed samples exhibited long-term stabilities since, after 5000 cycles of cyclic voltammetry scans, their mass activity losses and specific activity losses were 7.6%−16.9%, which were lower than those of the commercial electrode (27.6%−29.4%).…”

Section: Electrochemical Catalysismentioning

confidence: 98%

“…Hence, these species were desorbed faster, leaving more active sites, and increasing the ORR activity. 134,135 For example, core−shell structures with multilayer Pt-rich shells around Pt-Cu alloy particle cores, prepared by electrochemical dealloying of Pt 25 −Cu 75 alloy precursors, demonstrated a surface catalytic enhancement of up to 4 times in terms of Pt mass activity and more than 10 times in terms of specific activity, 136 when compared to a state-of-theart Pt cathode catalyst (Table 2, entry 47). 137 The precursor alloy was annealed at 600, 800, or 950 °C (Table 2, entries 1− 3), and the annealing temperature affected the amount of Cu removed by dealloying, hence the ORR.…”

Section: Electrochemical Catalysismentioning

confidence: 99%

“…The core–shell structure exhibited an induced compressive strain leading to changes in the metal electronic band structure and weaker chemisorption of oxygenated intermediates (O*, OH*). Hence, these species were desorbed faster, leaving more active sites, and increasing the ORR activity. , …”

Section: Applications Of Dealloyed Materialsmentioning

confidence: 99%

See 3 more Smart Citations

Nanoporous Dealloyed Metal Materials Processing and Applications─A Review

Scandura

Kumari

Palmisano

et al. 2023

Ind. Eng. Chem. Res.

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The development of porous metal materials with pore geometries and sizes at the nanoscale offers promising opportunities for the development of smart responsive interfaces for separation and catalytic applications and as building blocks for complex composite materials. Dealloying is an innovative technique based on selective removal of a sacrificial metal from a metal alloy to engineer surface textures and pores across significant thicknesses. Dealloyed structures may be processed over large scales and for a range of source alloys, offering unprecedented manufacturing opportunities. This review presents the operations and challenges of dealloying routes and discusses avenues for process optimizations and improvements, aiming at the development of scalable nanoporous materials. The potential of dealloyed materials for catalytic and sensing applications is expanded and benchmarked against reference materials. Future prospects and applications of dealloyed materials toward surface reactivity control and pore architecture development are highlighted.

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Section: Applications Of Dealloyed Materialsmentioning

confidence: 97%

Section: Electrochemical Catalysismentioning

confidence: 98%

Section: Electrochemical Catalysismentioning

confidence: 99%

Section: Applications Of Dealloyed Materialsmentioning

confidence: 99%

See 2 more Smart Citations

Nanoporous Dealloyed Metal Materials Processing and Applications─A Review

Scandura

Kumari

Palmisano

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Dealloying of Mn, Cr, or V may lead to maximizing the presence of other active elements (i.e., Fe, Ni, or Co) at the catalyst surface or increasing the electrochemical active surface area (ECSA). [53,54] Another hypothesis suggests that the increase in OER activity, with dealloying, may occur when some elements (e.g., Mn) redistribute to the surface before leaching out into the electrolyte. The presence of Mn with a higher population in the vicinity of Ni or Co, at the sample surface, was reported to increase the catalytic activity due to facile deprotonation of OH − .…”

Section: Electrocatalytic Activitymentioning

confidence: 99%

Carbothermal Shock Synthesis of High Entropy Oxide Catalysts: Dynamic Structural and Chemical Reconstruction Boosting the Catalytic Activity and Stability toward Oxygen Evolution Reaction

Abdelhafiz

Wang

Harutyunyan

et al. 2022

Advanced Energy Materials

Self Cite

107

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Mixed transition‐metals (TM) based catalysts have shown huge promise for water splitting. Conventional synthesis of nanomaterials is strongly constrained by room‐temperature equilibria and Ostwald ripening. Ultra‐fast temperature cycling enables the synthesis of metastable metallic phases of high entropy alloy nanoparticles, which later transform to oxide/hydroxide nanoparticles upon use in aqueous electrolytes. Herein, an in situ synthesis of non‐noble metal high entropy oxide (HEO) catalysts on carbon fibers by rapid Joule heating and quenching is reported. Different compositions of ternary to senary (FeNiCoCrMnV) HEO nanoparticles show higher activity towards catalyzing the oxygen evolution reaction (OER) compared to a noble metal IrO2 catalyst. The synthesized HEO also show two orders of magnitude higher stability than IrO2, due to stronger carbide‐mediated intimacy with the substrate, activated through the OER process. Alloying elements Cr, Mn and V affect OER activity by promoting different oxidation states of the catalytically active TM (Fe, Ni and Co). Dissolution of less stable elements (Mn, V and Cr) leads to enhancements of OER activity. Dynamic structural and chemical perturbations of HEO oxide nanoparticles activate under OER conditions, leading to enlargement in ECSA by forming mixed single atom catalysts and ultra‐fine oxyhydroxide nanoparticles HEOs.

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Pulsed Light Synthesis of High Entropy Nanocatalysts with Enhanced Catalytic Activity and Prolonged Stability for Oxygen Evolution Reaction

et al. 2023

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The ability to synthesize compositionally complex nanostructures rapidly is a key to high-throughput functional materials discovery. In addition to being time-consuming, a majority of conventional materials synthesis processes closely follow thermodynamics equilibria, which limit the discovery of new classes of metastable phases such as high entropy oxides (HEO). Herein, a photonic flash synthesis of HEO nanoparticles at timescales of milliseconds is demonstrated. By leveraging the abrupt heating and cooling cycles induced by a high-power-density xenon pulsed light, mixed transition metal salt precursors undergo rapid chemical transformations. Hence, nanoparticles form within milliseconds with a strong affinity to bind to the carbon substrate. Oxygen evolution reaction (OER) activity measurements of the synthesized nanoparticles demonstrate two orders of magnitude prolonged stability at high current densities, without noticeable decay in performance, compared to commercial IrO 2 catalyst. This superior catalytic activity originates from the synergistic effect of different alloying elements mixed at a high entropic state. It is found that Cr addition influences surface activity the most by promoting higher oxidation states, favoring optimal interaction with OER intermediates. The proposed high-throughput method opens new pathways toward developing next-generation functional materials for various electronics, sensing, and environmental applications, in addition to renewable energy conversion.

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De-alloyed ternary electrocatalysts with high activity and stability for oxygen reduction reaction

Cited by 24 publications

References 59 publications

Nanoporous Dealloyed Metal Materials Processing and Applications─A Review

Nanoporous Dealloyed Metal Materials Processing and Applications─A Review

Carbothermal Shock Synthesis of High Entropy Oxide Catalysts: Dynamic Structural and Chemical Reconstruction Boosting the Catalytic Activity and Stability toward Oxygen Evolution Reaction

Pulsed Light Synthesis of High Entropy Nanocatalysts with Enhanced Catalytic Activity and Prolonged Stability for Oxygen Evolution Reaction

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