Hierarchical PdNi alloy nanochains coupled with Ni(OH)<sub>2</sub> nanosheets to enhance CO-poisoning resistance for the methanol oxidation reaction

Yang, Anzhou; Su, Keying; Liang, Yujia; Yang, Shan; Lei, Wu; Tang, Yawen; Qiu, Xiaoyu

doi:10.1039/d3nr02487c

Cited by 7 publications

(5 citation statements)

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“…These lattice phases scarcely exist alone, but they were usually mixed together disorderly to form a chaotic structure, resulting in most of the Pd–Ni nanoparticles hardly distinguishing the existence of any single lattice plane, as was denoted by the white circles in Figure f. Therefore, numerous lattice dislocations appeared in the Pd–Ni nanoparticles due to the presence of the multiple lattice phases with different lattice spacings . These lattice dislocations could cause abundant lattice defects existing in the Pd–Ni nanoparticles, owing to the NiB, Pd 2 B, and Ni nanoclusters inserted into the Pd–Ni nanoparticles .…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, numerous lattice dislocations appeared in the Pd− Ni nanoparticles due to the presence of the multiple lattice phases with different lattice spacings. 28 These lattice dislocations could cause abundant lattice defects existing in the Pd−Ni nanoparticles, owing to the NiB, Pd 2 B, and Ni nanoclusters inserted into the Pd−Ni nanoparticles. 29 Additionally, these lattice dislocations also led to plenty of the lattice strain among the NiB, Pd 2 B, Ni, and Pd nanoclusters in the Pd−Ni nanoparticles.…”

Section: Catalyst Synthesismentioning

confidence: 99%

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Investigation of Pd₂B- and NiB-Doped Pd–Ni/C Electrocatalysts with High Activity for Methanol Oxidation

Wu,

Yan,

et al. 2024

ACS Appl. Energy Mater.

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The Pd−Ni/C catalyst was synthesized under medium strongly acidic media regulated by ammonia solution, using NaBH 4 as a reducing agent and polyvinylpyrrolidone (PVP) as a protector. The TEM, HRTEM, and XRD results exhibited that the Pd−Ni/C catalyst was successfully synthesized and doped with Pd 2 B and NiB. The XPS analysis showed that Pd and Ni mainly existed with an oxidized state in the Pd−Ni/C catalysts, and Pd and Ni also had a strong electronic interaction. Moreover, B and Ni were respectively inserted into the atomic spacing of Pd−Pd, which significantly changed the surface electronic state and atomic spacing of Pd, helping to improve the activity of the Pd−Ni/C catalyst. The electrochemical performance analyzed through cyclic voltammetry, chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS) displayed that the Pd−Ni/C catalyst had good activity and CO tolerance for methanol electro-oxidation. Furthermore, the Pd−Ni/C catalyst synthesized at which the ratio between the actual and stoichiometric amounts of NaBH 4 was 25 (Pd−Ni/C-25) showed the optimal ECSA and anodic current density for methanol electro-oxidation, respectively reaching 1602.2 cm 2 mg −1 Pd and 1406.5 mA mg −1 Pd. Moreover, the linear relationship between the methanol oxidation on the Pd−Ni/C-25 catalyst and the square root of the scan rate indicated that the electrokinetics of this electrochemical reaction was a diffusion-controlled process, further implying its excellent electrocatalytic performance. The results of the CA curves showed that the Pd−Ni/C-25 catalyst also had excellent durability because of its good antitoxicity. The EIS results presented that the Pd−Ni/C-25 catalyst had the best charge transfer efficiency among these Pd−Ni/C catalysts. The good activity, CO tolerance, durability, and charge transfer efficiency of the Pd−Ni/C-25 catalyst demonstrated its wide potential application in direct methanol fuel cells.

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Section: Resultsmentioning

confidence: 99%

Section: Catalyst Synthesismentioning

confidence: 99%

Investigation of Pd₂B- and NiB-Doped Pd–Ni/C Electrocatalysts with High Activity for Methanol Oxidation

Wu,

Yan,

et al. 2024

ACS Appl. Energy Mater.

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“…These findings suggested that Ni in NiPdH NNs primarily exists as Ni 2+ . This could be attributed to the fact that Ni metal is oxyphilic and easily oxidized when exposed to air . The XPS survey spectra of NiPdH NNs and PdNi NPs are presented in Figures S10 and S11, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…This could be attributed to the fact that Ni metal is oxyphilic and easily oxidized when exposed to air. 30 The XPS survey spectra of NiPdH NNs and PdNi NPs are presented in Figures S10 and S11, respectively. The Pd−N signal located at 397.3 eV was absent.…”

Section: Formation Mechanismmentioning

confidence: 99%

Ni²⁺ Tailoring Pd Enables Nanonet-Structured Catalysts with Dual Doping of H and Ni for Enhanced Alcohol Oxidation

Wang,

Ran,

Wang

et al. 2024

ACS Appl. Nano Mater.

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Ethanol oxidation reaction (EOR) is a crucial process in direct ethanol fuel cells. Although Pd exhibits potential as a substitute for Pt in EOR, its development is still hampered by its inferior activity due to its limited ability to break C−C bonds and the poisoning by strongly adsorbed intermediates. Herein, a one-step method for the preparation of NiPdH network nanomaterials (NiPdH NNs) was proposed with ethylene glycol (EG) as a H source. We explored the influence of preparation parameters on NiPdH NNs and examined the versatility of doping Pd with multiple metals and H in a one-step preparation method. These results demonstrated that urea can significantly influence the morphology of the samples. Additionally, the addition of metal sources had a crucial impact on the insertion of H. The doping of H and Ni can modify the electronic structure of Pd and might further modulate the adsorption strength of the reaction intermediates on the catalyst surface. Compared with PdNi nanoparticles without H atoms, NiPdH nanoparticles, and commercial Pd/C, NiPdH NN catalysts possessed the largest electrochemical active surface area and the smallest charge transfer resistance. Consequently, NiPdH NNs presented a strong resistance to CO poisoning, superior mass activities and catalytic stabilities in ethanol, methanol, and EG oxidation reactions. The significant enhancement in performance can be attributed to several factors. First, the oxyphilic metal Ni can promote the generation of OH* and accelerate the removal of CO. Second, the doping of H and Ni effectively regulates the electronic structure of Pd, optimizing the adsorption behaviors of reaction intermediates. Lastly, the network structure provides an abundance of catalytic active sites, promoting efficient mass transfer and overall reaction kinetics. This study offers valuable insights for the preparation of Pd-based hydrides with specific structures.

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“…38–42 PtPd and NiPd alloys exhibited high stability, durability, and CO tolerance as electrodes in applications such as the ORR, electrooxidation of alcohols and formic acid, and CO 2 electroreduction. 41–47 Considering the catalytic performance and cost-effectiveness, designing NiPtPd NPs with a Ni-rich core and a shell rich in Pt and Pd will be ideal. In the field of catalysts, the above structure is unique with the following advantages: (a) reduced consumption of Pt and Pd per unit volume, (b) strong resistance under acidic and basic conditions, and (c) high catalytic properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of low-cost multi-element Pt-based alloy nanoparticles as catalysts for the oxygen reduction reaction

Cuya Huaman,

Taniguchi,

Iwata

et al. 2024

Nanoscale

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Hierarchical PdNi alloy nanochains coupled with Ni(OH)₂ nanosheets to enhance CO-poisoning resistance for the methanol oxidation reaction

Abstract: Hybridizing Pd-based electrocatalysts with Ni-based species has been recognized as an effective pathway to enhance the catalytic performance for methanol oxidation reaction (MOR). However, doping Ni-based species with heterogeneous valence...

Cited by 7 publications

References 60 publications

Investigation of Pd₂B- and NiB-Doped Pd–Ni/C Electrocatalysts with High Activity for Methanol Oxidation

Investigation of Pd₂B- and NiB-Doped Pd–Ni/C Electrocatalysts with High Activity for Methanol Oxidation

Ni²⁺ Tailoring Pd Enables Nanonet-Structured Catalysts with Dual Doping of H and Ni for Enhanced Alcohol Oxidation

Synthesis of low-cost multi-element Pt-based alloy nanoparticles as catalysts for the oxygen reduction reaction

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Hierarchical PdNi alloy nanochains coupled with Ni(OH)2 nanosheets to enhance CO-poisoning resistance for the methanol oxidation reaction

Abstract: Hybridizing Pd-based electrocatalysts with Ni-based species has been recognized as an effective pathway to enhance the catalytic performance for methanol oxidation reaction (MOR). However, doping Ni-based species with heterogeneous valence...

Cited by 7 publications

References 60 publications

Investigation of Pd2B- and NiB-Doped Pd–Ni/C Electrocatalysts with High Activity for Methanol Oxidation

Investigation of Pd2B- and NiB-Doped Pd–Ni/C Electrocatalysts with High Activity for Methanol Oxidation

Ni2+ Tailoring Pd Enables Nanonet-Structured Catalysts with Dual Doping of H and Ni for Enhanced Alcohol Oxidation

Synthesis of low-cost multi-element Pt-based alloy nanoparticles as catalysts for the oxygen reduction reaction

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Hierarchical PdNi alloy nanochains coupled with Ni(OH)₂ nanosheets to enhance CO-poisoning resistance for the methanol oxidation reaction

Investigation of Pd₂B- and NiB-Doped Pd–Ni/C Electrocatalysts with High Activity for Methanol Oxidation

Investigation of Pd₂B- and NiB-Doped Pd–Ni/C Electrocatalysts with High Activity for Methanol Oxidation

Ni²⁺ Tailoring Pd Enables Nanonet-Structured Catalysts with Dual Doping of H and Ni for Enhanced Alcohol Oxidation