An ultrastable bimetallic carbide as platinum electrocatalyst support for highly active oxygen reduction reaction

Yan, Zaoxue; Zhang, Mingmei; Xie, Jimin; Shen, Pei Kang

doi:10.1016/j.jpowsour.2015.07.010

Cited by 18 publications

(5 citation statements)

References 48 publications

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“…32,33,42 Molybdenum carbides alone exhibited very limited activity for ORR, 24,26,29 but molybdenum carbides are excellent substrates for loading active component like Pt or Pd to considerably replace the noble metal, demonstrating comparable or even better catalytic activity toward oxygen reduction and particularly improving the stability of catalysts in various electrolytes. 23,37,43,44 Metallic Ag has been generally utilized as an electrocatalyst in air electrode for Al−air battery, demonstrating superior activity and stability. 45 We demonstrate that α-MoC-promoted Ag can be an intriguing candidate considered as a high efficient catalyst for oxygen reduction.…”

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confidence: 99%

“…In general, molybdenum carbide exists in four forms: α-MoC, β-Mo 2 C, γ-MoC, and η-MoC. , β-Mo 2 C, γ-MoC, and η-MoC have very similar hexagonal crystal structures with different stacking sequences. In particular, the β-Mo 2 C, the most stable phase having an ABAB packing of the metal planes, has been extensively investigated. ,,− ,,− However, the face-center cubic phase α-MoC with an ABCABC stacking sequence has been rarely touched. ,, Molybdenum carbides alone exhibited very limited activity for ORR, ,, but molybdenum carbides are excellent substrates for loading active component like Pt or Pd to considerably replace the noble metal, demonstrating comparable or even better catalytic activity toward oxygen reduction and particularly improving the stability of catalysts in various electrolytes. ,,, Metallic Ag has been generally utilized as an electrocatalyst in air electrode for Al–air battery, demonstrating superior activity and stability …”

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confidence: 99%

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Synergistic Effects of C/α-MoC and Ag for Efficient Oxygen Reduction Reaction

Cao

Tao

et al. 2018

J. Phys. Chem. Lett.

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It remains challenging to prepare highly active and stable catalysts from earth-abundant elements for the oxygen reduction reaction (ORR). Herein we report a facile method to synthesize cost-effective heterogeneous C/α-MoC/Ag electrocatalysts. Rotating disc electrode (RDE) experiments revealed that the obtained C/α-MoC/Ag exhibited much superior catalytic performance for ORR than that of C/Ag, C/α-MoC, or even the conventional Pt/C. First-principles calculations indicated that the enhanced activity could be attributed to the efficient synergistic effects between Ag and α-MoC/C by which the energy barrier for O dissociation has been substantially reduced. Furthermore, Li-air and Al-air cells were assembled to demonstrate the unprecedented electrochemical performance of C/α-MoC/Ag nanocomposites surpassing the Pt/C. Thus experimental results and theoretical calculations together showed that the heterogeneous C/α-MoC/Ag nanocomposites are a promising alternative to platinum for applications in industrial metal-air batteries.

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confidence: 99%

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confidence: 99%

Synergistic Effects of C/α-MoC and Ag for Efficient Oxygen Reduction Reaction

Cao

Tao

et al. 2018

J. Phys. Chem. Lett.

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“…To obtain non-noble metal components with a high intrinsic activity and a high intrinsic stability is of significance. Bimetallic carbide-based catalysts (such as Co 6 Mo 6 C 2 , Co 3 W 3 C, and Fe 2 MoC) have reported excellent activity, electron-donating performance, and stability in both acidic and alkaline media for ORR [5][6][7]. The doping of heteroatoms (such as N) can alter the electronic structure of the active center, further enhancing their activity [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…The doping of heteroatoms (such as N) can alter the electronic structure of the active center, further enhancing their activity [8][9][10]. As the synthesis temperature increases (above 1300 • C), metal carbides could transform into more stable crystals and have more favor for electron donation [6], exhibiting a much higher activity; more importantly, their stability is extremely high.…”

Section: Introductionmentioning

confidence: 99%

Practice of Ecological Aesthetics in Green Production of Bimetallic Carbide Catalyst for Oxygen Reduction Reaction: Integrating Technological Development with Ecological Protection

Zhang,

Wang,

Yan

2024

Sustainability

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This work summarizes the disciplinary connotation of ecological aesthetics, discusses the social and philosophical background of the origination of ecological aesthetics, and applies ecological aesthetics to the research on the production processes of catalytic materials. It is found that compared with conventional chemical processes, catalytic materials synthesized using green chemical processes that conform to ecological aesthetics have advantages in raw material cost, energy consumption, environmental protection, operational complexity, and product performance. Based on this, it is proposed that, as green chemical processes develop to a certain extent, they will unify anthropocentrism and ecocentrism, and meet both human needs and ecological protection requirements. The mentioned green chemical processes adopt biomass lotus leaf stems as a carbon source to produce non-noble metal bimetallic carbide (C19Cr7Mo24)-based catalysts for oxygen reduction reaction (ORR). Its initial half-wave potential (E1/2) for catalyzing ORR in an alkaline medium is 0.903 V, the E1/2 retention rate after 50,000 cycles is 98.9%, and its peak power density in H2/O2 fuel cell reaches 1.47 W cm−2, making it one of the most active non-noble metal catalysts for ORR reported so far; its stability is unparalleled.

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“…However, as a support, α-MoC, β-Mo 2 C, γ-MoC, and η-MoC reveal a synergistic impact in some reactions at ambient temperatures and thus have been employed as promoters of noble metal electro-catalysts. It has been reported that their composites with Pt or Pd demonstrate comparable or even greater activity toward the oxygen reduction reaction (ORR), − methanol oxidation, and water gas shift reaction with their ability to provide hydroxyl groups by dissociating O–H bonds (e.g., on MoC next to Pt) and reacting as a cocatalyst.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Coupling of a Molybdenum Carbide Nanosphere with Pt Nanoparticles for Enhanced Ammonia Electro-Oxidation Activity in Alkaline Media

Bayati

Liu²,

Abellán

et al. 2019

ACS Appl. Energy Mater.

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Ammonia will play a pivotal role in the future of zero carbon emitted sustainable fuel. The development of inexpensive efficient catalysts for ammonia electro-oxidation (AEO) is essential to its success. This study provides evidence that nanoparticles of earth-abundant elements, e.g. MoC, encapsulated in a doped-graphene shell (DG-MoC) are promising co-2 catalysts of Pt for AEO which significantly improves the catalyst cost and activity in comparison to the state of art platinum. DG-MoC, DG-MoC-supported Pt (Pt/DG-MoC) and nitrogen-dopedgraphene (NG) catalysts were synthesized and characterized by Brunauer-Emmett-Teller (BET) surface area analysis, electrochemical techniques, X-ray photoelectron spectroscopy (XPS), Xray diffraction (XRD), Scanning Electron microscopy (SEM) combined with Energy-dispersive X-ray (EDX), Scanning transmission electron microscopy (STEM) and electron energy loss (EEL) spectroscopy. The XRD analysis of DG-MoC disclosed the presence of α-MoC 1-x Microscopy techniques demonstrate a close vicinity of Pt and MoC nanoparticles in Pt/DG-MoC.We report, for the first time, that Pt/DG-MoC particles reveal a large synergistic effect for AEO activity whilst DG-MoC and NG showed no activity. Pt/DG-MoC gave a higher current density, lower half-and peak-potentials (28 mV and 14 mV respectively) and greater resilience to ammonia poisoning than Pt/C as shown in fall in the peak current density in the second voltammogram, i.e, approximately 3.6%, compare to 20.7% for Pt/C. The XPS spectrum of the catalysts explained the source of this synergistic effect.

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An ultrastable bimetallic carbide as platinum electrocatalyst support for highly active oxygen reduction reaction

Cited by 18 publications

References 48 publications

Synergistic Effects of C/α-MoC and Ag for Efficient Oxygen Reduction Reaction

Synergistic Effects of C/α-MoC and Ag for Efficient Oxygen Reduction Reaction

Practice of Ecological Aesthetics in Green Production of Bimetallic Carbide Catalyst for Oxygen Reduction Reaction: Integrating Technological Development with Ecological Protection

Synergistic Coupling of a Molybdenum Carbide Nanosphere with Pt Nanoparticles for Enhanced Ammonia Electro-Oxidation Activity in Alkaline Media

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