Assembly of trimetallic palladium-silver-copper nanosheets for efficient C2 alcohol electrooxidation

Li, Ze; Lao, Xianzhuo; Yang, Likang; Fu, Aiping; Guo, Peizhi

doi:10.1007/s40843-022-2104-4

Cited by 19 publications

(11 citation statements)

References 60 publications

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“…Various efficient strategies have been developed to break the challenges of fuel cells, such as doping, depositing, alloying, surface engineering, etc. − One such approach is to enhance Pt utilization by dispersing Pt nanoparticles (NPs) on high specific surface area supports. Carbon materials, including graphene, carbon fibers (CFs), mesoporous carbon, biomass-derived biochar, and multiwalled carbon nanotubes (MWCNTs), all have been extensively studied as supportive materials. − Among them, MWCNTs have garnered significant interest owing to their excellent conductivity and electrochemical stability. − In addition, incorporating other metal elements such as Ni, Co, and Pd in Pt NPs has been shown to significantly improve the utilization and electroactivity of Pt-based alloys through electronic structure effects. − For example, Chen et al synthesized ordered PtSn NPs with higher MOR performance and durability than those of commercial catalysts …”

Section: Introductionmentioning

confidence: 99%

Electronic Structure Effect of PtCo Alloy with Adjustable Compositions for Efficient Methanol Electrooxidation

Zheng,

Wang,

Ren

et al. 2023

Langmuir

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Various efficient strategies have been developed to overcome the anodic electrocatalyst issue of methanol-based fuel cells owing to their complicated methanol electrooxidation mechanism. In this work, PtCo nanoparticles with adjustable compositions supported on multiwalled carbon nanotubes (Pt 1 Co x /MWCNTs) through the adsorbing−coating−annealing− etching route were synthesized. Compared with the Pt/C catalyst, Pt 1 Co 3 /MWCNTs exhibit better electrocatalytic MOR activity in both activity and durability. Notably, the electrochemical mass and specific activity of the as-prepared catalyst are 1.04 mA μg −1 Pt and 2.18 mA cm −2 , respectively, which are higher than those of the Pt/ C catalyst. Moreover, the as-prepared sample revealed lower onset potential during the CO stripping test. Furthermore, the Pt 1 Co 3 / MWCNTs possess a lower current density decrease rate in chronoamperometry and cyclic durability tests. The enhancement of activity and stability of Pt 1 Co 3 /MWCNTs could be ascribed to their ordered morphological structure, the electronic interaction between MWCNTs and PtCo nanoparticles, and the suitable electronic structure effect between Pt/Co ratios. The concept of the catalyst design in this study offers a different guideline for constructing the novel methanol electrooxidation catalyst, which will accelerate the widespread fuel cell practical application.

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Section: Introductionmentioning

confidence: 99%

Electronic Structure Effect of PtCo Alloy with Adjustable Compositions for Efficient Methanol Electrooxidation

Zheng,

Wang,

Ren

et al. 2023

Langmuir

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“…On the contrary, the positive shifts of the diffraction peaks indicate the compressive strain is included, leading to lattice compression. 38 Therefore, the unit cells of the nanosheets turned larger with more lead atoms doping. According to Bragg's law and the Debye− Scherrer equation, the PdPb-CA-1, PdPb-CA-2, and PbPb-CA-3 were under tensile strain values of 0.2, 1.5, and 2.0% (Figure 2b), respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…It is widely reported that the negative shifts of the diffraction peaks mean the tensile strain is included, resulting in lattice expansion. On the contrary, the positive shifts of the diffraction peaks indicate the compressive strain is included, leading to lattice compression . Therefore, the unit cells of the nanosheets turned larger with more lead atoms doping.…”

Section: Resultsmentioning

confidence: 99%

Strain Engineering of Face-Centered Cubic Pd–Pb Nanosheets Boosts Electrocatalytic Ethanol Oxidation

Gao

et al. 2023

ACS Appl. Energy Mater.

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Strain engineering of nanomaterials provides a promising avenue to tune the physicochemical properties of nanomaterials. Meanwhile, preparing low-dimension nanomaterials like nanosheets in a facile way remains challenging. Herein, we prepared a class of strained 2D palladium–lead nanosheets with face-centered cubic structures. Those nanosheets can expose a lot of active sites for ethanol oxidation reaction (EOR). The strain values of PdPb-CA are calculated to be 0.2, 1.5, and 2.0%, where the corresponding values increase as more lead atoms are doping, followed by decreased binding energies. This means that the strain effect would upshift the d-band center toward the Fermi level, with a consequence in stronger binding ability. Impressively, PdPb-CA-2 possesses 2431 mA mgPd –1 toward EOR, approximately 4.2 times higher than the commercial Pd/C counterpart. Interestingly, PdPb-CA exhibits a “volcano-type” behavior, where the maximum electrocatalytic activity can be obtained from the equilibrium condition of the adsorption energies of the active intermediate (OH*) and the blocking species (CO*). This work reveals a promising approach to constructing low-dimensional nanocatalysts with abundant active sites and controllable strain degrees as efficient fuel cell catalysts.

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“…46-1043], respectively . Due to the different atomic radii of the second metal, when introduced into the fcc crystal of Pd, different lattice changes are induced. , As depicted in Figure b, the enlarged XRD patterns show the shift of the characteristic diffraction peaks occurring near the (111) crystal plane for the bimetallic alloy. When silver atoms are introduced into the lattice, a slight lattice expansion is induced in the crystal due to the silver atom radius being slightly larger than the radius of the Pd atom, which mainly shows tensile strain.…”

Section: Resultsmentioning

confidence: 99%

Assembly of Alloyed PdM (Ag, Cu, and Sn) Nanosheets and Their Electrocatalytic Oxidation of Ethanol and Methanol

Yang,

Li,

Chen

et al. 2023

Inorg. Chem.

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Direct alcohol fuel cells are popular due to their high energy density, abundant sources, and ease of transportation and storage. Palladium-based nanosheet self-assembled materials have emerged as an effective catalyst for alcohol oxidation reactions. In this work, nanosheets were synthesized with the same feeding ratio assembly of alloyed PdM (M = Ag, Cu, and Sn). The introduction of the second element was able to enhance the catalytic response of the catalysts to alcohol electrooxidation. Among them, the PdCu alloy exhibited the best performance in terms of catalytic activity, toxicity resistance, and stability to ethanol oxidation reaction (EOR) and methanol oxidation reaction (MOR). The catalytic current densities for EOR can reach 2226, 2518, and 1598 mA mg–1 for PdAg, PdCu, and PdSn nanosheet assemblies, respectively. These are mainly attributed to better electronic effects, altered atomic distances within the cell for the d-band centers of Pd, and a larger electrochemical active surface area (ECSA). The optimized d-band center is beneficial to promote the catalytic performance of EOR and MOR. Experimental data also demonstrated that higher electrocatalytic temperature, higher pH, and higher alcohol concentration can accelerate the rate of alcohol electrooxidation. These results have the potential to be extended to Pd-M (M = other metals) nanosheets and help for a wider range of catalytic applications.

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Assembly of trimetallic palladium-silver-copper nanosheets for efficient C2 alcohol electrooxidation

Cited by 19 publications

References 60 publications

Electronic Structure Effect of PtCo Alloy with Adjustable Compositions for Efficient Methanol Electrooxidation

Electronic Structure Effect of PtCo Alloy with Adjustable Compositions for Efficient Methanol Electrooxidation

Strain Engineering of Face-Centered Cubic Pd–Pb Nanosheets Boosts Electrocatalytic Ethanol Oxidation

Assembly of Alloyed PdM (Ag, Cu, and Sn) Nanosheets and Their Electrocatalytic Oxidation of Ethanol and Methanol

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