High-Index-Facet- and High-Surface-Energy Nanocrystals of Metals and Metal Oxides as Highly Efficient Catalysts

Chi, Xiao; Lu, Bang‐An; Xue, Peng; Tian, Na; Zhou, Zhi‐You; Lin, Xingyi; Lin, Wen‐Feng; Sun, Shi‐Gang

doi:10.1016/j.joule.2020.10.002

Cited by 166 publications

(135 citation statements)

References 256 publications

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“…[19,[26][27] To further improve the stability of PtÀ M catalysts, extensive efforts have been made to explore dimensional engineering, dealloying, support modification, surface doping, etc. [28][29][30][31][32][33] Among these approaches, introducing a third metal to form a ternary alloy or surface doping is one of the most promising strategies. [34] For example, MoÀ Pt 3 Ni octahedra, [35] GaÀ Pt 3 Ni octahedra, [36] AuÀ PtCu octahedra, [37] PtNiCu octahedra, [38] PtNiRh nanowires [39] were reported to exhibit enhanced stability than corresponding binary PtÀ M catalysts.…”

Section: Introductionmentioning

confidence: 99%

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Improved Stability of Octahedral PtCu by Rh Doping for the Oxygen Reduction Reaction

Wang

Chen

et al. 2021

ChemElectroChem

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Octahedral PtÀ M nanocrystals are recognized to be ideal catalysts for the oxygen reduction reaction (ORR) because of their outstanding electrocatalytic activity. However, these highactivity catalysts usually show shortage in the long-term stability since the octahedral morphology is severely destroyed and transition metals are easily leached out during the electrochemical test. Herein, we prepared octahedral PtCu and PtCuRh 0.05 nanocrystals with an edge length of about 15 nm. After being dispersed on carbon black, the octahedral PtCu/C catalyst exhibits a very high ORR activity with a specific activity and mass activity of 3.29 mA cm À 2 and 1.12 A mg Pt À 1 at 0.90 V, making it among one of the most active PtCu catalyst for ORR ever reported. Although the incorporation of Rh slightly decreases the ORR activity, it can improve the stability, and the half-wave potential is only shifted negatively by 1 mV after an accelerated durability test of 10,000 potential cycles for the PtCuRh 0.05 /C catalyst. The improved stability is attributed to the anchoring effect of the Rh atoms, which inhibits the leaching of Cu and helps to maintain the octahedral morphology during the ORR.

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Section: Introductionmentioning

confidence: 99%

“…To further improve the stability of Pt−M catalysts, extensive efforts have been made to explore dimensional engineering, dealloying, support modification, surface doping, etc [28–33] . Among these approaches, introducing a third metal to form a ternary alloy or surface doping is one of the most promising strategies [34] .…”

Section: Introductionmentioning

confidence: 99%

Improved Stability of Octahedral PtCu by Rh Doping for the Oxygen Reduction Reaction

Wang

Chen

et al. 2021

ChemElectroChem

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“…The Gibbs free energy required to form the COOH* intermediate on the high-index facets of Au NBPs is significantly lower than that on the low-index facets of Au NSs. [68] As a result, Au NBPs exhibit higher CO production activity (Figure 3a) than Au NSs (Figure S18, Supporting Information). In the second step, the atomic steps on Au NBPs can maximize the interfacial coupling with the supported Cu domains and optimize the binding of key intermediates in the C 2 pathway, boosting the generation of C 2 products.…”

Section: (6 Of 11)mentioning

confidence: 99%

Symmetry‐Broken Au–Cu Heterostructures and their Tandem Catalysis Process in Electrochemical CO₂ Reduction

Jia

Yang

Chow

et al. 2021

Adv Funct Materials

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Symmetry-breaking synthesis of colloidal nanocrystals with desired structures and properties has aroused widespread interest in various fields, but the lack of robust synthetic protocols and the complex growth kinetics limit their practical applications. Herein, a general strategy is developed to synthesize the Au-Cu Janus nanocrystals (JNCs) through the site-selective growth of Cu nanodomains on Au nanocrystals, which is directed by the substantial lattice mismatch between them, with the assistance of judicious manipulation of the growth kinetics. This strategy can work on Au nanocrystals with different architectures for the achievement of diverse asymmetric Au-Cu hybrid nanostructures. Of particular note, the obtained Au nanobipyramids (Au NBPs)-based JNCs facilitate the conversion of CO 2 to C 2 hydrocarbon production during electrocatalysis, with the Faradaic efficiency and maximum partial current density being 4.1-fold and 6.4-fold higher than those of their monometallic Cu counterparts, respectively. The excellent electrocatalytic performances benefit from the special design of the Au-Cu Janus architectures and their tandem catalysis mechanism as well as the high-index facets on Au nanocrystals. This research provides a new approach to synthesize various hybrid Janus nanostructures, facilitating the study of structure-function relationship in the catalytic process and the rational design of efficient heterogeneous electrocatalysts.

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“…For polycrystalline Pt, the surface is usually considered to be a mixture of three basic crystallographic facets, with an average surface atomic density of 1.31 × 1,015/cm 2 . Therefore, the adsorption charge density of 210 C/cm 2 can generally be used as a reference value ( Tian et al, 2008 ; Xiao et al, 2020 ). For Pt (111) crystallographic facet, when the potential is lower than 0.05 V RHE, the H evolution current will arise, leading to a detection of only 2/3 monolayer H coverage above the lower limit of H desorption current of 0.05 V (RHE).…”

Section: Crystallographic Facet Engineeringmentioning

confidence: 99%

Atomic Regulation of PGM Electrocatalysts for the Oxygen Reduction Reaction

Chen

Zhao

et al. 2021

Front. Chem.

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With the increasing enthusiasm for the hydrogen economy and zero-emission fuel cell technologies, intensive efforts have been dedicated to the development of high-performance electrocatalytic materials for the cathodic oxygen reduction reaction (ORR). Some major fundamental breakthroughs have been made in the past few years. Therefore, reviewing the most recent development of platinum-group-metal (PGM) ORR electrocatalysts is of great significance to pushing it forward. It is known that the ORR on the fuel cell electrode is a heterogeneous reaction occurring at the solid/liquid interface, wherein the electron reduces the oxygen along with species in the electrolyte. Therefore, the ORR kinetic is in close correlation with the electronic density of states and wave function, which are dominated by the localized atomic structure including the atomic distance and coordination number (CN). In this review, the recent development in the regulation over the localized state on the catalyst surface is narrowed down to the following structural factors whereby the corresponding strategies include: the crystallographic facet engineering, phase engineering, strain engineering, and defect engineering. Although these strategies show distinctive features, they are not entirely independent, because they all correlate with the atomic local structure. This review will be mainly divided into four parts with critical analyses and comparisons of breakthroughs. Meanwhile, each part is described with some more specific techniques as a methodological guideline. It is hoped that the review will enhance an insightful understanding on PGM catalysts of ORR with a visionary outlook.

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High-Index-Facet- and High-Surface-Energy Nanocrystals of Metals and Metal Oxides as Highly Efficient Catalysts

Cited by 166 publications

References 256 publications

Improved Stability of Octahedral PtCu by Rh Doping for the Oxygen Reduction Reaction

Improved Stability of Octahedral PtCu by Rh Doping for the Oxygen Reduction Reaction

Symmetry‐Broken Au–Cu Heterostructures and their Tandem Catalysis Process in Electrochemical CO₂ Reduction

Atomic Regulation of PGM Electrocatalysts for the Oxygen Reduction Reaction

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High-Index-Facet- and High-Surface-Energy Nanocrystals of Metals and Metal Oxides as Highly Efficient Catalysts

Cited by 166 publications

References 256 publications

Improved Stability of Octahedral PtCu by Rh Doping for the Oxygen Reduction Reaction

Improved Stability of Octahedral PtCu by Rh Doping for the Oxygen Reduction Reaction

Symmetry‐Broken Au–Cu Heterostructures and their Tandem Catalysis Process in Electrochemical CO2 Reduction

Atomic Regulation of PGM Electrocatalysts for the Oxygen Reduction Reaction

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Product

Resources

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Symmetry‐Broken Au–Cu Heterostructures and their Tandem Catalysis Process in Electrochemical CO₂ Reduction