The fabrication of Pt–Pb alloy networks with high-density micropores by dealloying for enhanced oxygen reduction activity

Liu, Yaming; Wang, Meng; Sheng, Shanxiang; Zhi, Chao; Wang, Yongzhen; Li, Xiang

doi:10.1016/j.ijhydene.2022.12.276

Cited by 11 publications

(5 citation statements)

References 44 publications

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“…This positively shifted binding energy of Pt in PtP 2 nanocrystals can be attributed to partial electron transfer from Pt to P due to P’s higher electronegativity. Previous research has shown that enhanced electron transfer behavior from Pt to surrounding species leads to electron delocalization and downshift of the d -band center of Pt, thereby facilitating MOR catalytic properties. − Regarding the P 2p core-level spectra in Figure e, the spectra of P 2p in the PtP 2 nanocrystals can be deconvoluted into two distinct peaks. The peak at around 133.3 eV in the P 2p XPS spectrum can be assigned to the P–O signal resulting from the oxidation of P species within nanocrystals upon exposure to air .…”

Section: Resultsmentioning

confidence: 92%

Facile Synthesis of PtP₂ Nanocrystals as Highly Active Electrocatalysts for Methanol Oxidation

Guo,

Ji,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

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Although significant efforts have been made in the past few decades, the development of affordable, durable, and effective electrocatalysts for direct methanol fuel cells (DMFCs) remains a formidable challenge. Herein, we present a facile and efficient phosphorization approach for synthesizing PtP 2 intermetallic nanocrystals and utilize them as electrocatalysts in the methanol oxidation reaction (MOR). Impressively, the synthesized PtP 2 nanocatalysts exhibit a mass activity of 2.14 mA μg −1 and a specific activity of 6.28 mA cm −2 , which are 5.1 and 9.5 times higher than those achieved by the current state-of-the-art commercial Pt/C catalyst, respectively. Moreover, the PtP 2 nanocatalysts demonstrate improved stability toward acidic MOR by retaining 92.1% of its initial mass activity after undergoing 5000 potential cycles, far surpassing that of the commercial Pt/C (38%). Further DMFC tests present a 2.7 times higher power density than that of the commercial Pt/C, underscoring their potential for application in methanol fuel cells. Density functional theory calculations suggest that the accelerated MOR kinetics and improved CO tolerance on PtP 2 can be attributed to the attenuated binding strength of CO intermediates and the enhanced stability due to strong Pt−P interaction. To our knowledge, this is the first report identifying the MOR performance on PtP 2 intermetallic nanocrystals, highlighting their potential as highly active and stable nanocatalysts for DMFCs.

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Section: Resultsmentioning

confidence: 92%

Facile Synthesis of PtP₂ Nanocrystals as Highly Active Electrocatalysts for Methanol Oxidation

Guo,

Ji,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

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“…Pt 3 Pb NWs were prepared by adding H 2 PtCl 6 and (CH 3 COO) 2 Pb to a mixture of DMF and H 2 O containing PVP and thiophene, and then the liquid mixture was heated to 160 °C in 0.5 h and kept at 160 °C for 10 h. 23 The generated products were collected after centrifugation and washing with ethanol/water ( V / V = 1/1) to remove residual reagents. The key point of this synthesis process is using DMF and H 2 O.…”

Section: Resultsmentioning

confidence: 99%

Ultrathin Pt₃Pb nanowires prepared in the aqueous phase for enhanced methanol electrooxidation

et al. 2023

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“…The excessive use of traditional fossil fuels has brought a lot of environmental problems to mankind, so it is urgent to seek clean energy storage and conversion technology to solve the pollution problem. − Fuel cells have received a lot of attention from scientists because they emit only water. − Among them, direct methanol fuel cells have attracted much attention because of their convenient synthesis and transportation of raw materials. , Palladium is the most promising candidate to catalyze the electrocatalytic oxidation of methanol in direct methanol fuel cells. − However, palladium is a rare metal, and its high price and rare reserves strictly limit its large-scale use in fuel cells . Therefore, it is very important to design and synthesize efficient Pd-based electrocatalysts for methanol oxidation to reduce the dosage of palladium atoms.…”

Section: Introductionmentioning

confidence: 99%

Phosphorus-Doped PdSn Nanocatalyst with Abundant Defective Atoms for Enhanced Methanol Oxidation

Liu

et al. 2023

ACS Appl. Mater. Interfaces

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The design of the nanostructure of palladium-based nanocatalysts is considered to be a very effective way to improve the performance of nanocatalysts. Recent studies have shown that multiphase nanostructures can increase the active sites of palladium catalysts, thus effectively improving the catalytic efficiency of palladium atoms. However, it is difficult to regulate the phase structure of Pd nanocatalysts to form a compound phase structure. In this work, PdSnP nanocatalysts with different compositions were synthesized by fine-regulating the doping amount of phosphorus atoms. The results show that the doping of phosphorus atoms not only changes the composition of PdSn nanocatalysts but also changes the microstructure, forming amorphous and crystalline multiphase structures. This multiphase nanostructure contains abundant interfacial defects, which effectively promotes the electrocatalytic oxidation efficiency of Pd atoms in small-molecule alcohols. Compared with the undoped PdSn nanocatalyst (480 mA mg Pd −1 and 2.28 mA cm −2 ) and the commercial Pd/C catalyst (397 mA mg Pd −1 and 1.15 mA cm −2 ), the mass (1746 mA mg Pd −1) and specific activities (8.56 mA cm −2 ) of PdSn 0.38 P 0.05 nanocatalysts in the methanol oxidation reaction were increased by 3.6 and 3.8 times and 4.4 and 7.4 times, respectively. This study provides a new synthesis strategy for the design and synthesis of efficient palladium-based nanocatalysts for the oxidation of small-molecule alcohols.

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The fabrication of Pt–Pb alloy networks with high-density micropores by dealloying for enhanced oxygen reduction activity

Cited by 11 publications

References 44 publications

Facile Synthesis of PtP₂ Nanocrystals as Highly Active Electrocatalysts for Methanol Oxidation

Facile Synthesis of PtP₂ Nanocrystals as Highly Active Electrocatalysts for Methanol Oxidation

Ultrathin Pt₃Pb nanowires prepared in the aqueous phase for enhanced methanol electrooxidation

Phosphorus-Doped PdSn Nanocatalyst with Abundant Defective Atoms for Enhanced Methanol Oxidation

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The fabrication of Pt–Pb alloy networks with high-density micropores by dealloying for enhanced oxygen reduction activity

Cited by 11 publications

References 44 publications

Facile Synthesis of PtP2 Nanocrystals as Highly Active Electrocatalysts for Methanol Oxidation

Facile Synthesis of PtP2 Nanocrystals as Highly Active Electrocatalysts for Methanol Oxidation

Ultrathin Pt3Pb nanowires prepared in the aqueous phase for enhanced methanol electrooxidation

Phosphorus-Doped PdSn Nanocatalyst with Abundant Defective Atoms for Enhanced Methanol Oxidation

Contact Info

Product

Resources

About

Facile Synthesis of PtP₂ Nanocrystals as Highly Active Electrocatalysts for Methanol Oxidation

Facile Synthesis of PtP₂ Nanocrystals as Highly Active Electrocatalysts for Methanol Oxidation

Ultrathin Pt₃Pb nanowires prepared in the aqueous phase for enhanced methanol electrooxidation