Tailoring the morphology of Ni–Pt nanocatalysts through the variation of oleylamine and oleic acid: a study on oxygen reduction from synthesis to fuel cell application

Reyes-Rodríguez, José Luis; Velázquez-Osorio, A.; Bahena, Daniel; Soto-Guzman, Adriana; Leyva, Marco A.; Rodríguez-Castellanos, Alejandro; Citalán-Cigarroa, S.; Solorza‐Feria, O.

doi:10.1039/c9cy00419j

Cited by 17 publications

(12 citation statements)

References 75 publications

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“…The above strategies result in conductive, stable, and active catalysts in half-cell experiments and in PEMFC tests. One of the first steps in the development of more active catalysts was to form Pt-based alloys, Pt-M type (M = transition metal, e.g., Pt-Au [ 240 ], Pt-Fe [ 241 ], Pt-Ni [ 242 ]) or Pt-MN (M ≠ N e.g., Pt 2 CuNi [ 243 ] or PtNiMo [ 244 ]). Yin et al reported the production of Pt-Au alloy nanoparticles, which not only achieved a more active catalyst than Pt/C, but also explained the effect that the heat treatment has on the structure of nanoparticle, and how this treatment considerably increases the catalytic activity of the bimetallic material.…”

Section: Electrocatalysts and Electrodesmentioning

confidence: 99%

Proton Exchange Membrane Fuel Cells (PEMFCs): Advances and Challenges

Tellez-Cruz¹,

et al. 2021

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The study of the electrochemical catalyst conversion of renewable electricity and carbon oxides into chemical fuels attracts a great deal of attention by different researchers. The main role of this process is in mitigating the worldwide energy crisis through a closed technological carbon cycle, where chemical fuels, such as hydrogen, are stored and reconverted to electricity via electrochemical reaction processes in fuel cells. The scientific community focuses its efforts on the development of high-performance polymeric membranes together with nanomaterials with high catalytic activity and stability in order to reduce the platinum group metal applied as a cathode to build stacks of proton exchange membrane fuel cells (PEMFCs) to work at low and moderate temperatures. The design of new conductive membranes and nanoparticles (NPs) whose morphology directly affects their catalytic properties is of utmost importance. Nanoparticle morphologies, like cubes, octahedrons, icosahedrons, bipyramids, plates, and polyhedrons, among others, are widely studied for catalysis applications. The recent progress around the high catalytic activity has focused on the stabilizing agents and their potential impact on nanomaterial synthesis to induce changes in the morphology of NPs.

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Section: Electrocatalysts and Electrodesmentioning

confidence: 99%

Proton Exchange Membrane Fuel Cells (PEMFCs): Advances and Challenges

Tellez-Cruz¹,

et al. 2021

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“…The reduction rate of Pt precursor (Pt-OAm complex) is much faster than the reduction rate of Ni precursor (Ni-OAm complex) because OAm molecules (hard base) strongly coordinate with Ni 2 + ions (hard acid), forming a strong metal-ligand complex. [40,41] Initially, a high decomposition rate of Pt precursor leads to the supersaturated solution with Pt monomers and Pt nuclei form. As the reaction is progressed further, the concentration of Pt monomers falls due to the rapid depletion of Pt monomer in the nucleation stage, and Ni monomer concentration gradually increases in the solution.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of CO‐tolerant Ni‐Pt Rhombic Dodecahedra Bimetallic Electrocatalytic Nanoparticles

2020

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Developing scalable synthetic routes for fabricating low-cost CO-tolerant and highly active electrocatalysts have significant relevance for fuel cell applications. Here, we report a novel and rapid single step synthesis of Ni enriched bimetallic core-shell (NiÀ Pt) rhombic dodecahedra nanoparticles (NPs) via the thermal decomposition of precursor in the presence of oleylamine. Electrochemical dealloying in acidic medium (0.1 M HClO 4 ) subjecting NPs to different potential cycles is employed to vary the chemical composition and morphologies of parent bimetallic core-shell NPs. As a result, rhombic dodecahedra NPs transform to different morphologies such as concave, nanocage (open structure), and squeezed nanocage. Our results reveal that concave rhombic dodecahedra shaped electrocatalysts show high resistance to CO poisoning compare to core-shell, nanocage, and squeezed nanocage morphologies as well as commercial Pt/C electrocatalysts. The improved CO tolerant of concave rhombic dodecahedra bimetallic NPs results from the presence of optimal content of Ni along with Pt content at the surface. We also demonstrate that CO tolerance of concave bimetallic NPs can be changed by electrochemical parameters such as the scan rate and CO adsorption potential. Overall, the present study presents a conceptual strategy for achieving improved CO tolerance by change in the composition and morphologies of bimetallic core-shell NPs.

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“…Membrane electrode assemblies (MEAs) and electrocatalytic inks were prepared following the procedure previously described in ref . Briefly, commercial 20% Pt/C Etek nanoparticles and synthesized Ni–Pt/C polyhedral nanoparticles (60% wt Pt) were used as the catalytic material for the anode and cathode, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The performance of MEAs prepared with SPEEK/ZIF membranes was evaluated in a Fuel Cell Test System model 890B, coupled to a Compucell GT humidification system operating with a backup pressure of 30 psi and a 0.08 L min –1 flowrate of H 2 and O 2 for anode and cathode, respectively. An activation protocol using voltage steps was performed following the procedure reported in ref to obtain the polarization curves at different temperatures of the cell in the range of 80–120 °C. An MEA prepared with commercial Nafion 117 membrane was assembled and evaluated under the same conditions for comparison purposes.…”

Section: Methodsmentioning

confidence: 99%

Novel SPEEK-ZIF-67 Proton Exchange Nanocomposite Membrane for PEMFC Application at Intermediate Temperatures

Barjola

Reyes-Rodríguez

Solorza‐Feria

et al. 2021

Ind. Eng. Chem. Res.

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In this study, nanocomposite membranes were prepared by mixing of 1, 3, and 5% wt cobalt-based zeolitic imidazolate framework (ZIF-67) with a sulfonated poly(ether ether ketone) (SPEEK) matrix. The films named SPEEK, SPEEK-Z1, SPEEK-Z3, and SPEEK-Z5 were obtained by the casting method and then characterized by several techniques such as scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and electrochemical impedance spectroscopy (EIS). Ion-exchange capacity (IEC) and water uptake (WU) were also measured. Subsequently, the polymeric nanocomposite membranes were tested in a H 2 /O 2 single cell to evaluate their performance. Our results show that the proton conductivity of nanocomposite membranes increased with the addition of ZIF, obtaining the best value of 0.014 S cm −1 for the SPEEK-Z1 membrane. Furthermore, the thermal stability of the nanocomposite membranes improved considerably with the ZIF addition. Polymer electrolyte membrane fuel cells (PEMFC) performance experiments showed promising results for these membranes working at intermediate temperatures above 100 °C, although a proper optimization process is still required.

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Tailoring the morphology of Ni–Pt nanocatalysts through the variation of oleylamine and oleic acid: a study on oxygen reduction from synthesis to fuel cell application

Abstract: Systematic study on the variation of morphology, size and composition of Ni–Pt nanoparticles with higher catalytic activity towards oxygen reduction.

Cited by 17 publications

References 75 publications

Proton Exchange Membrane Fuel Cells (PEMFCs): Advances and Challenges

Proton Exchange Membrane Fuel Cells (PEMFCs): Advances and Challenges

Synthesis of CO‐tolerant Ni‐Pt Rhombic Dodecahedra Bimetallic Electrocatalytic Nanoparticles

Novel SPEEK-ZIF-67 Proton Exchange Nanocomposite Membrane for PEMFC Application at Intermediate Temperatures

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