Amorphous palladium-based alloy nanoparticles as highly active electrocatalysts for ethanol oxidation

Zhang, Yufeng; Fang, Jinjie; Zhang, Lipeng; Wei, Dong; Zhu, Wei; Zhuang, Zhongbin

doi:10.1039/d2cc00956k

Cited by 11 publications

(18 citation statements)

References 29 publications

(43 reference statements)

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“…50 These characteristics make the amorphous phase unique in catalysis. For example, Zhang et al 62 reported palladium-based amorphous alloy nanoparticles for efficient EOR. Wang et al 63 synthesized Pd/C decorated on amorphous NiCo 2 O 4 as a highly active electrocatalyst for the EOR.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Electrocatalytic Oxidation of Urea and Ethanol on Two-Dimensional Amorphous Nickel Oxide Encapsulated on N-Doped Carbon Nanosheets

Shekhawat

Samanta

Panigrahy

et al. 2023

ACS Appl. Energy Mater.

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Hydrogen production from water electrolysis is of great interest for attaining sustainable clean energy storage and conversion, but the required working voltage (>1.23 V) in water splitting limits its applications in industrial expansion. Therefore, replacing the oxygen evolution reaction (OER) with a more favorable anodic oxidation reaction, which can provide more valuable products and less working voltage, will be of great significance for the upcoming expansion of hydrogen production in industrial applications. In this report, a two-dimensional (2D) amorphous sheet-like nickel oxide encapsulated on the nitrogendoped carbon (NiO x /CN x ) composite was synthesized for the urea oxidation reaction (UOR) and ethanol oxidation reaction (EOR). Remarkably, the catalyst shows 1.647, 1.378, and 1.354 V vs. reversible hydrogen electrode (RHE) potential at 10 mA/cm 2 current density for OER, UOR, and EOR, respectively, with good stability. The overall water, urea, and ethanol electrolyses of NiO x /CN x were carried out by coupling with commercial Pt/C as a cathode which shows only 1.626, 1.43, and 1.414 V cell potential at 20 mA/cm 2 current density. The catalyst also shows excellent chronopotentiometric and dynamic stability toward all the electrolyses. The high catalytic activity of NiO x /CN x may be attributed to the synergistic interaction between the support and materials, amorphous structure, 2D sheet-like morphology, porous structure, and high electrochemical surface area. This finding shows that NiO x /CN x nanosheets can replace noble metal-based catalysts for efficient anodic oxidation reactions.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Electrocatalytic Oxidation of Urea and Ethanol on Two-Dimensional Amorphous Nickel Oxide Encapsulated on N-Doped Carbon Nanosheets

Shekhawat

Samanta

Panigrahy

et al. 2023

ACS Appl. Energy Mater.

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“…These results indicate that the presence of phosphorus atoms can affect the electronic structure of palladium atoms, making the palladium atom lose some electrons. The lost electrons for palladium will enhance the adsorption of OH, thereby promoting the catalytic efficiency of alcohol molecules on its surface …”

Section: Resultsmentioning

confidence: 99%

“…The electron structure of the palladium atom can be changed by doping, and the catalytic efficiency can be improved by the synergistic effect of the two elements . At present, commonly used doping atoms are Au, Cr, Fe, Co, H, C, N, S, and P. − Among them, the doping of phosphorus atoms shows its unique charm. − The phosphorus atom is a kind of small radius atom, which usually enters the lattice gap of palladium after doping into the palladium nanocatalysts, thus changing the arrangement of palladium atoms from a crystalline structure to an amorphous structure . This structural change can effectively change the adsorption energy of palladium atoms to the intermediate products of catalytic reaction, which can improve the electrocatalytic efficiency .…”

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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“…CO‐stripping experiments are performed to examine the poisoning tolerance of the catalysts to intermediates (Figure 3d). The L‐PdP NA shows the most negative stripping peak potential (0.779 V) and onset potential (0.629 V), since the tensile surface strain facilitates the OH adsorption during the removal of an adsorbed acetyl group, thus promoting the oxidation of CO. [ 8,32 ]…”

Section: Resultsmentioning

confidence: 99%

Highly Selective Pd Nanosheet Aerogel Catalyst with Hybrid Strain Induced by Laser Irradiation and P Doping Postprocess

Zhang

Guo

et al. 2022

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Strain engineering of electrocatalysts provides an effective strategy to improve the intrinsic catalytic activity. Here, the defect‐rich crystalline/amorphous Pd nanosheet aerogel with hybrid microstrain and lattice strain is synthesized by combining laser irradiation and phosphorus doping methods. The surface strain exhibited by the microstrain and lattice strain shifts the d‐band center of the electrocatalyst, enhancing the adsorption of intermediates in the ethanol oxidation reaction and thus improving the catalytic performances. The measured mass activity, specific activity and C1‐path selectivity of the Pd nanosheet aerogel are 4.48, 3.06, and 5.06 times higher than those of commercial Pd/C, respectively. These findings afford a new strategy for the preparation of highl activity and C1 pathway selective catalysts and provide insight into the catalytic mechanism of strain‐rich heterojunction materials based on tunable surface strain values.

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Amorphous palladium-based alloy nanoparticles as highly active electrocatalysts for ethanol oxidation

Abstract: Amorphous Pd-P metal-metalloid alloy nanoparticles showed higher electrochemical ethanol oxidation reaction performance than the crystalline Pd nanopartilces. The high performance was attributed to the rich defective coordination unsaturated sites and...

Cited by 11 publications

References 29 publications

Electrocatalytic Oxidation of Urea and Ethanol on Two-Dimensional Amorphous Nickel Oxide Encapsulated on N-Doped Carbon Nanosheets

Electrocatalytic Oxidation of Urea and Ethanol on Two-Dimensional Amorphous Nickel Oxide Encapsulated on N-Doped Carbon Nanosheets

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

Highly Selective Pd Nanosheet Aerogel Catalyst with Hybrid Strain Induced by Laser Irradiation and P Doping Postprocess

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