Platinum group metal-free NiMo hydrogen oxidation catalysts: high performance and durability in alkaline exchange membrane fuel cells

Kabir, Sadia; Lemire, Kenneth; Artyushkova, Kateryna; Roy, Aaron; Odgaard, Madeleine; Schlueter, Debbie; Oshchepkov, Alexandr G.; Bonnefont, Antoine; Savinova, Elena R.; Sabarirajan, Dinesh C.; Mandal, Pratiti; Crumlin, Ethan J.; Zenyuk, Iryna V.; Atanassov, Plamen; Serov, Alexey

doi:10.1039/c7ta08718g

Cited by 160 publications

(140 citation statements)

References 43 publications

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“…Elemental composition pre‐ and post‐methanization treatment were obtained through X‐ray photoelectron spectroscopy as shown in Figure and Table . High‐resolution Mo 3d spectrum was fit using multiple symmetrical peaks due to following valence states: two peaks due to Mo coordinated to C (peaks at 228.2 and 228.6 eV), Mo(IV) at 229.7 eV, Mo(V) at 230.6 eV and Mo(VI) at 232.2 eV according to the reference database and reports in the literature . It is also worthwhile to note that we only discuss changes to the 5/2 component of the Mo 3d spectrum because changes in the 3/2 component are redundant to the changes in the more intense part of the spectrum.…”

Section: Resultsmentioning

confidence: 99%

Facile synthesis of high surface area molybdenum carbide nanoparticles

2018

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Molybdenum carbide has immense potential as an active catalyst for reaction systems such as synthesis of important chemicals like ammonia. However, the carbide is not used as a commercial catalyst or support as the current synthesis processes produce low surface area material or have contaminants such as excess carbon and surface and chemisorbed oxygen. Moreover, attempts to refine the synthesis pathways are usually not supported by any thermochemical modeling. In this study, a facile and reproducible method to synthesize high surface area molybdenum carbide was developed with the help of thermochemical modeling to better understand molybdenum‐carbon phase behavior. We have synthesized 2‐5 nm particles of MoxC with surface areas of up to 360 m2/g as characterized using a variety of techniques including X‐ray diffraction and electron microscopy.

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Section: Resultsmentioning

confidence: 99%

Facile synthesis of high surface area molybdenum carbide nanoparticles

2018

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“…One step in doing this is to eliminate platinum from the electrodes either through the use of a historically less expensive precious metal such as palladium (see the supporting information and Figure S1 for more discussion and detail), or by using more naturally abundant platinum group metal (PGM)-free catalysts. [3][4][5][6][7][8] However, when transitioning away from Pt, it is very important not to markedly sacrifice catalyst activity or AEMFC performance.…”

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confidence: 99%

Beyond 1.0 W cm⁻²Performance without Platinum: The Beginning of a New Era in Anion Exchange Membrane Fuel Cells

Omasta

Peng

Miller

et al. 2018

J. Electrochem. Soc.

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This work reports a high power, stable, completely Pt-free anion exchange membrane fuel cell (AEMFC) comprised of highly active catalysts -Pd-CeO 2 /C at the anode and PdCu/C alloy at the cathode for the hydrogen oxidation and oxygen reduction reactions, respectively. The resulting AEMFC shows outstanding performance, reaching a peak power density of 1 W cm −2 , twice the value of the best performance for Pt-free cells reported in the literature to date. The AEMFC also shows a low voltage degradation rate when operated continuously for more than 100 h at a constant 0.5 A cm −2 , with a voltage degradation rate of only 2.5 mV h -1 , which is excellent when compared to nearly all of the AEMFCs reported in the literature to date. This combination of high performance and high stability in the absence of Pt-based catalysts represents a significant landmark in the progress of the AEMFC technology.

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“…Interestingly, Wang et al . suggested to use the hydrogen oxidation reaction (HOR; Figure C) as the anodic reaction, which decreases the voltage required to operate the electrolyzer by approximately 1.23 V and expands the range of possible electrocatalysts that could be employed in acidic and alkaline environment (e.g., Pt‐ or Ni‐based). Furthermore, as suggested in the introduction, the oxidation of Cl − in Cl 2 is also to be considered.…”

Section: Toward Syngas Generation On An Industrial Scalementioning

confidence: 99%

Metal–Nitrogen–Carbon Electrocatalysts for CO₂ Reduction towards Syngas Generation

2020

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Shifting syngas (an H2/CO mixture) production away from fossil‐fuel‐dependent processes (e.g., steam methane reforming and coal gasification) is mandatory, as syngas is of interest as both a fuel and as a value‐added chemical precursor. With appropriate electrocatalysts, such as silver‐based and metal–nitrogen–carbon (M‐N‐C) materials, the electrochemical CO2 reduction reaction (CO2RR) allows for the production of CO alongside H2 (from the hydrogen evolution reaction), and thus leads to syngas generation. In this Minireview, the application of M‐N‐C electrocatalysts for syngas generation is discussed. The mechanisms leading to different faradaic selectivities for CO are reviewed as a function of the nature of the metal, by using both computational and experimental approaches. The role played by the metal‐free moieties in the M‐N‐C electrocatalysts is underlined. Since M‐N‐C electrocatalysts only recently entered the CO2RR field (as opposed to Cu‐, Ag‐, or Au‐based nanostructures), they have been mainly characterized in static liquid environments, in which the reaction rate is significantly hampered by CO2‐dissolution/diffusion limitations. Therefore, the design of CO2RR electrolyzers for M‐N‐C electrocatalysts is addressed, and designs such as zero‐gap electrolyzers with anionic membranes and humidified CO2 gas feed at the cathode are highlighted.

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Platinum group metal-free NiMo hydrogen oxidation catalysts: high performance and durability in alkaline exchange membrane fuel cells

Abstract: A highly active NiMo electrocatalyst for HOR in alkaline media with power density at 0.5 V higher than 100 mW cm−2 (peak value of 120 mW cm−2), which is similar to palladium was synthesized and comprehensively studied.

Cited by 160 publications

References 43 publications

Facile synthesis of high surface area molybdenum carbide nanoparticles

Facile synthesis of high surface area molybdenum carbide nanoparticles

Beyond 1.0 W cm⁻²Performance without Platinum: The Beginning of a New Era in Anion Exchange Membrane Fuel Cells

Metal–Nitrogen–Carbon Electrocatalysts for CO₂ Reduction towards Syngas Generation

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Platinum group metal-free NiMo hydrogen oxidation catalysts: high performance and durability in alkaline exchange membrane fuel cells

Abstract: A highly active NiMo electrocatalyst for HOR in alkaline media with power density at 0.5 V higher than 100 mW cm−2 (peak value of 120 mW cm−2), which is similar to palladium was synthesized and comprehensively studied.

Cited by 160 publications

References 43 publications

Facile synthesis of high surface area molybdenum carbide nanoparticles

Facile synthesis of high surface area molybdenum carbide nanoparticles

Beyond 1.0 W cm−2Performance without Platinum: The Beginning of a New Era in Anion Exchange Membrane Fuel Cells

Metal–Nitrogen–Carbon Electrocatalysts for CO2 Reduction towards Syngas Generation

Contact Info

Product

Resources

About

Beyond 1.0 W cm⁻²Performance without Platinum: The Beginning of a New Era in Anion Exchange Membrane Fuel Cells

Metal–Nitrogen–Carbon Electrocatalysts for CO₂ Reduction towards Syngas Generation