Interfacial synergistic effect in SnO2/PtNi nanocrystals enclosed by high-index facets for high-efficiency ethylene glycol electrooxidation

Li, Shuna; Sun, Haixiao; Zhang, Jiaai; Zheng, Longjiao; Li, Yunrui; Fang, Xu; Liu, Yujie; Qin, Song; Wang, Zhen; Gao, Yufeng; Zhang, Xin; Dai, Xiaoping; Cai, Yi; Gao, Fei

doi:10.1007/s12274-022-4433-0

“…As the successful synthesis of PtZn alloy, the incorporated Zn atoms could occupy the Pt sites in the fcc structure to induce the decrease of interplanar spacing, thus resulting in compression stress on the lattice of Pt . Furthermore, the samples using Nb 2 O 5 /C as support exhibit greater diffraction peak shift toward the higher angle, and the reason could be the lattice strain results from the lattice mismatch between PtZn alloy and Nb 2 O 5 , which reveals the existence of the interaction between them . Besides, the peaks of Pt(220) are fitted to obtain the lattice parameter (α) (Table S3) according to Vegard’s law to exhibit the lattice strain more visually …”

Section: Resultsmentioning

confidence: 99%

“…35 Furthermore, the samples using Nb 2 O 5 /C as support exhibit greater diffraction peak shift toward the higher angle, and the reason could be the lattice strain results from the lattice mismatch between PtZn alloy and Nb 2 O 5 , 36 which reveals the existence of the interaction between them. 37 Besides, the peaks of Pt(220) are fitted to obtain the lattice parameter (α) (Table S3) according to Vegard's law to exhibit the lattice strain more visually. 38 The TEM image (Figure 2c) demonstrates that the average particle size of PtZn-Nb 2 O 5 /C−II is 4.35 nm (Figure S4).…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Interface Engineering of PtZn Alloy and Nb₂O₅ for Promoting Ammonia Oxidation Reaction and Hydrogen Evolution Reaction

Tan,

Yu,

Zhai

et al. 2023

Langmuir

4

0

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Ammonia electrolysis is a promising technology to obtain green hydrogen with zero-carbon emission, in which ammonia oxidation reaction (AOR) and hydrogen evolution reaction (HER) occur at the anode and cathode, respectively. However, the lack of efficient catalysts hinders its practical application. Herein, PtZn alloy is combined with Nb 2 O 5 to construct a bifunctional heterostructure catalyst (PtZn-Nb 2 O 5 /C). The optimal sample with Nb 2 O 5 content of 7.05 wt % demonstrates the best performance with a peak current density of 304.1 mA mg −1 Pt for AOR, and it is only reduced by 17.0% after 4000 cycles of durability tests. For HER, it has a low overpotential of 34 mV at −10 mA cm −2 under the alkaline condition. This can be ascribed to the interfacial interaction between the PtZn alloy and Nb 2 O 5 , which adjusts the adsorption behavior of OH ad to concurrently promote AOR and HER activity. This work thus proposes a viable strategy to design an efficient bifunctional catalyst for hydrogen generation from ammonia electrolysis.

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Suppression of Structural Heterogeneity in High‐Entropy Intermetallics for Electrocatalytic Upgrading of Waste Plastics

Hao,

Wang,

Cai

et al. 2024

Angewandte Chemie

0

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The key to fully realizing the potential of high‐entropy alloys (HEAs) lies in balancing their inherent local chemical disordering with the long‐range ordering required for electrochemical applications. Herein, we synthesized a distinctive L10‐(PtIr)(FeMoBi) high‐entropy intermetallics (HEIs) exhibiting nanoscale long‐range order and atomic scale short‐range disorder via a lattice compensation strategy to mitigate the entropy reduction tendency. The (PtIr)(FeMoBi) catalyst exhibited remarkable activity and selectivity of glycollic acid (GA) production via electrocatalytic waste polymer‐derived ethylene glycol oxidation reaction (EGOR). With a mass activity of 5.2 A mgPt–1 and a Faradic efficiency (FE) for GA of 95 %, it outperformed most previously reported electrocatalysts for selective GA production. The lattice‐compensation effect promotes the homogeneity of Pt and Fe actives sites, facilitating co‐adsorption of EG and OH and reducing the energy barriers for dehydrogenation and OH‐combination processes. This approach effectively avoids the formation of low‐active sites commonly encountered in HEA solid solutions, offering a promising avenue for exploring the complex interplay between catalytic activity and HEI structures.

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Suppression of Structural Heterogeneity in High‐Entropy Intermetallics for Electrocatalytic Upgrading of Waste Plastics

Hao,

Wang,

Cai

et al. 2024

Angew Chem Int Ed

0

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The key to fully realizing the potential of high‐entropy alloys (HEAs) lies in balancing their inherent local chemical disordering with the long‐range ordering required for electrochemical applications. Herein, we synthesized a distinctive L10‐(PtIr)(FeMoBi) high‐entropy intermetallics (HEIs) exhibiting nanoscale long‐range order and atomic scale short‐range disorder via a lattice compensation strategy to mitigate the entropy reduction tendency. The (PtIr)(FeMoBi) catalyst exhibited remarkable activity and selectivity of glycollic acid (GA) production via electrocatalytic waste polymer‐derived ethylene glycol oxidation reaction (EGOR). With a mass activity of 5.2 A mgPt–1 and a Faradic efficiency (FE) for GA of 95 %, it outperformed most previously reported electrocatalysts for selective GA production. The lattice‐compensation effect promotes the homogeneity of Pt and Fe actives sites, facilitating co‐adsorption of EG and OH and reducing the energy barriers for dehydrogenation and OH‐combination processes. This approach effectively avoids the formation of low‐active sites commonly encountered in HEA solid solutions, offering a promising avenue for exploring the complex interplay between catalytic activity and HEI structures.

show abstract

Interfacial synergistic effect in SnO2/PtNi nanocrystals enclosed by high-index facets for high-efficiency ethylene glycol electrooxidation

Cited by 14 publications

References 56 publications

Interface Engineering of PtZn Alloy and Nb₂O₅ for Promoting Ammonia Oxidation Reaction and Hydrogen Evolution Reaction

Interface Engineering of PtZn Alloy and Nb₂O₅ for Promoting Ammonia Oxidation Reaction and Hydrogen Evolution Reaction

Suppression of Structural Heterogeneity in High‐Entropy Intermetallics for Electrocatalytic Upgrading of Waste Plastics

Suppression of Structural Heterogeneity in High‐Entropy Intermetallics for Electrocatalytic Upgrading of Waste Plastics

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Interfacial synergistic effect in SnO2/PtNi nanocrystals enclosed by high-index facets for high-efficiency ethylene glycol electrooxidation

Cited by 14 publications

References 56 publications

Interface Engineering of PtZn Alloy and Nb2O5 for Promoting Ammonia Oxidation Reaction and Hydrogen Evolution Reaction

Interface Engineering of PtZn Alloy and Nb2O5 for Promoting Ammonia Oxidation Reaction and Hydrogen Evolution Reaction

Suppression of Structural Heterogeneity in High‐Entropy Intermetallics for Electrocatalytic Upgrading of Waste Plastics

Suppression of Structural Heterogeneity in High‐Entropy Intermetallics for Electrocatalytic Upgrading of Waste Plastics

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Product

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About

Interface Engineering of PtZn Alloy and Nb₂O₅ for Promoting Ammonia Oxidation Reaction and Hydrogen Evolution Reaction

Interface Engineering of PtZn Alloy and Nb₂O₅ for Promoting Ammonia Oxidation Reaction and Hydrogen Evolution Reaction