PtCo/CoO x nanocomposites: Bifunctional electrocatalysts for oxygen reduction and evolution reactions synthesized via tandem laser ablation synthesis in solution-galvanic replacement reactions

Hu, Sheng; Goenaga, Gabriel A.; Melton, Chad A.; Zawodzinski, Thomas A.; Mukherjee, Dibyendu

doi:10.1016/j.apcatb.2015.09.035

Cited by 101 publications

(73 citation statements)

References 58 publications

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“…did not ablate a Co−Pt target of various composition but a cobalt target in PtCl 4 − solution of various Pt concentrations in order to synthesize bimetallic PtCo NPs supported on CoOx in a one‐step RLAL process. The mass‐specific OER activity was found to even exceed the commercial Pt/C catalyst (Figure c) and explained with synergetic “spillover” effects at the PtCo‐CoO x interface …”

Section: Laser‐based Materials Design: Multi‐elemental Nanoparticlesmentioning

confidence: 98%

“…Yet, based on the recent laser‐based methods, defined bimetallic nanoparticle ultra‐structures are already accessible for catalytic studies to date . Figure summarizes the main types of bimetallic nanostructures together with corresponding laser‐generated exemplary nanomaterials available amongst others.…”

Section: Laser‐based Materials Design: Multi‐elemental Nanoparticlesmentioning

confidence: 99%

“…Later the term Laser Ablation Synthesis in solution‐Galvanic Replacement Reaction (LASis‐GRR) was introduced by Mukherjee et al., opening new RLAL opportunities to develop a large variety of novel materials with controllable properties (although still at low yields and the need of multiple purification steps), including core‐shell NPs or nanoalloys. In this context, PtCo NPs as remarkable ORR catalysts with controllable size, atomic compositions, and alloying degree had successfully been synthesized …”

Section: Laser‐based Materials Design: Multi‐elemental Nanoparticlesmentioning

confidence: 99%

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Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

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Due to material gaps and synthesis‐related cross‐correlations in heterogeneous catalysis, chemists and physicists are constantly motivated to develop novel catalyst preparation methods for independent control of morphology, size, and composition. Within this article, advances, opportunities, and the current limits of laser‐based catalyst preparation technique, as well as synergies with conventional methods will be reviewed in terms of purity, particle size, morphology, composition, and nanoparticle‐support interaction. It will be shown, that the surfactant‐free particles represent ideal model materials to validate kinetic models and conduct parametric activity studies by independent adjustment of functional properties like nanoparticle size, composition, and load. Consequently, the importance of transient plasma dynamics tailoring nanoparticle formation will be pointed out, comparing experimental studies with own calculations and novel simulations taken from literature. Finally, perspectives of surfactant‐free colloidal nanoparticles for unrevealing active sites in heterogeneous catalysts are presented.

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Section: Laser‐based Materials Design: Multi‐elemental Nanoparticlesmentioning

confidence: 98%

Section: Laser‐based Materials Design: Multi‐elemental Nanoparticlesmentioning

confidence: 99%

Section: Laser‐based Materials Design: Multi‐elemental Nanoparticlesmentioning

confidence: 99%

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Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

et al. 2019

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“…There are very few papers testing catalysts prepared by galvanic replacement as OER anodes and these include Pt(Co) [293] and Ir(Cu) [294][295][296] bimetallic electrode systems that they show improved mass specific activity with respect to the precious metal (Pt or Ir).…”

Section: Oxygen Evolutionmentioning

confidence: 99%

Electrocatalysts Prepared by Galvanic Replacement

et al. 2017

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Galvanic replacement is the spontaneous replacement of surface layers of a metal, M, by a more noble metal, M noble , when the former is treated with a solution containing the latter in ionic form, according to the general replacement reaction: nM + mM noble n+ → nM m+ + mM noble. The reaction is driven by the difference in the equilibrium potential of the two metal/metal ion redox couples and, to avoid parasitic cathodic processes such as oxygen reduction and (in some cases) hydrogen evolution too, both oxygen levels and the pH must be optimized. The resulting bimetallic material can in principle have a M noble-rich shell and M-rich core (denoted as M noble (M)) leading to a possible decrease in noble metal loading and the modification of its properties by the underlying metal M. This paper reviews a number of bimetallic or ternary electrocatalytic materials prepared by galvanic replacement for fuel cell, electrolysis and electrosynthesis reactions. These include oxygen reduction, methanol, formic acid and ethanol oxidation, hydrogen evolution and oxidation, oxygen evolution, borohydride oxidation, and halide reduction. Methods for depositing the precursor metal M on the support material (electrodeposition, electroless deposition, photodeposition) as well as the various options for the support are also reviewed. 1. Principle of Galvanic Replacement/Deposition 1.1. Thermodynamic Considerations When a metal, M (e.g., Cu, Fe, Co, Ni, Al, etc.), is immersed in a solution containing ions of a more noble metal, M noble n+ (e.g., Pt, Au, Pd, Ag, Ru, Ir, Rh, Os, etc.-i.e., a metal with a higher standard potential) then, due to the difference in their standard electrochemical potentials, E 0 noble − E 0 > 0, and provided that the ionic form of M is stable under the given experimental conditions (of temperatue, pH, complexing agents etc.), the following reaction is thermodynamically favored and can take place spontaneously: M noble n+ + n/m M → M noble + n/m M m+ (1) This reaction, which bears similarities with transmetalation reactions between metal complexes [1] and is also known as immersion plating [2] in the plating industry and galvanic replacement [3] in materials chemistry, can be considered to originate from the coupling of the following two half-reactions: M noble n+ + ne − ↔ M noble (E 0 noble) (2) M m+ + me − ↔ M (E 0) (3)

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“…Laser ablation has been reported as a useful method for preparing high‐performance OER catalysts . However, the catalysts prepared by these methods were normally dispersed in solution, which cannot be directly used as catalysts.…”

Section: Introductionmentioning

confidence: 99%

Rapid Fabrication of Ni/NiO@CoFe Layered Double Hydroxide Hierarchical Nanostructures by Femtosecond Laser Ablation and Electrodeposition for Efficient Overall Water Splitting

Yin

et al. 2019

ChemSusChem

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The development of simple and effective methods for the rapid preparation of electrocatalysts for overall water splitting from earth‐abundant elements is an important and challenging task. A facile and ultrafast two‐step method was developed to prepare a Ni/NiO@CoFe layered double hydroxide hierarchical nanostructure (NCF) within a few minutes by femtosecond laser ablation and electrodeposition. In 1 m KOH solution, the optimized NCF catalysts show a low overpotential of 230 mV for the oxygen evolution reaction (OER) at a current density of 10 mA cm−2 with a low Tafel slope of 34.3 mV dec−1, indicating fast and efficient OER kinetics. Owing to the synergistic effect between NiO and CoFe layered double hydroxide, the hydrogen evolution reaction performance of the NCF was also improved. The synthesized electrocatalysts were further utilized in overall water splitting with a potential of only 1.56 V at a current density of 10 mA cm−2 and excellent durability, better than that of the commercial RuO2(+)//Pt/C(−) system. The present work provides new insights on the rapid and facile preparation of efficient electrocatalysts for overall water splitting on a large scale.

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PtCo/CoO x nanocomposites: Bifunctional electrocatalysts for oxygen reduction and evolution reactions synthesized via tandem laser ablation synthesis in solution-galvanic replacement reactions

Cited by 101 publications

References 58 publications

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

Electrocatalysts Prepared by Galvanic Replacement

Rapid Fabrication of Ni/NiO@CoFe Layered Double Hydroxide Hierarchical Nanostructures by Femtosecond Laser Ablation and Electrodeposition for Efficient Overall Water Splitting

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