Carbon‐Supported, Selenium‐Modified Ruthenium–Molybdenum Catalysts for Oxygen Reduction in Acidic Media

Guinel, Maxime J.-F.; Bonakdarpour, Arman; Wang, Biao; Babu, P.; Ernst, F.; Ramaswamy, Nagappan; Mukerjee, Sanjeev; Wiȩckowski, Andrzej

doi:10.1002/cssc.200800215

Cited by 28 publications

(17 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As can be seen from the changing trend of CV curve, with the decrease of scanning speed, the charging current of the double electric layer decreases gradually, and the influence caused by the surface effect becomes weaker and weaker. In the 0.5M H 2 SO 4 solution saturated with N 2 , an obvious oxygen reduction peak appears in the range of 0.4–0.6 V. The higher the peak potential is, the lower the overpotential of the catalytic reaction is, and the better the performance of the corresponding gas diffusion electrode is 14 . According to Figure 9, the Ep value of the platinum oxide film electrode reaches the highest at 0.52 V under the condition of 10 mA/s.…”

Section: Resultsmentioning

confidence: 99%

“…The mechanism of its oxygen reduction activity can be explained as the electronic effect caused by the change of its structure and composition, 13 which is influenced by the ligand effect, stress effect, solution saturated with N 2 , an obvious oxygen reduction peak appears in the range of 0.4-0.6 V. The higher the peak potential is, the lower the overpotential of the catalytic reaction is, and the better the performance of the corresponding gas diffusion electrode is. 14 According to Figure 9, the Ep value of the platinum oxide film electrode reaches the highest at 0.52 V under the condition of 10 mA/s. With the increase of scanning speed, the Ep value of the electrode gradually shifts negatively, indicating that the platinum oxide film electrode obtained under the condition of 10 mA/s has a good electrocatalytic activity.…”

Section: Cyclic Voltammetry Behavior Under Different Conditionsmentioning

confidence: 90%

See 1 more Smart Citation

Preparation and electrocatalytic property of three‐dimensional nano‐dendritic platinum oxide film

Shen

Wang

et al. 2022

Surface & Interface Analysis

View full text Add to dashboard Cite

Platinum oxide electrode, as an important part of hydrogen concentration monitoring sensor built in containment, needs to withstand extreme conditions such as high temperature, high humidity, and high irradiation and can still work normally even in the case of serious accidents, which puts forward higher requirements for its performance. In present study, platinum oxide film electrode was successfully prepared with three‐dimensional nano‐dendritic, uniform, and crack‐free on platinum substrate by reactive magnetron sputtering, and the influence of different substrate temperature and sputtering atmosphere on the composition, morphology, and electrocatalytic property of the film was investigated. The results show that platinum oxide film is composed of PtO and PtO2. As the temperature increases from room temperature (RT) to 200°C, the oxygen vacancies in the amorphous film are gradually repaired and convert to the crystalline state, which shows increasing PtO2 ratio, increasing electrochemical active area (ECSA), and improved stability. When the temperature is rising to 400°C, the film shows decreasing oxygen vacancies, increasing average grain size. Because PtO2 decomposes into PtO and Pt, and thus ECSA decreases, the stability and oxygen reduction activity of the films decreases gradually. At the same temperature, the crystalline film obtained in Ar/50%O2 has higher concentration of oxygen vacancies and smaller average grain size than that obtained in O2, resulting in larger ECSA and relatively good stability. By contrast, the platinum oxide film electrode prepared in Ar/50%O2 and 200°C has better stability and excellent electrocatalytic activity for oxygen reduction.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Cyclic Voltammetry Behavior Under Different Conditionsmentioning

confidence: 90%

Preparation and electrocatalytic property of three‐dimensional nano‐dendritic platinum oxide film

Shen

Wang

et al. 2022

Surface & Interface Analysis

View full text Add to dashboard Cite

show abstract

“…RuSe x NPs on a carbon substrate, RuSe x /C, were synthesized by a one‐pot SCEF process (see the Experimental Section). Given that RuSe x can only be obtained at high temperature, the low‐temperature (350 °C) synthesis reported here can only provide a surface modification of an Ru NP. An identically controlled SCEF synthesis of the Ru from RuCl 3 · x H 2 O without the SeO 2 precursor gave a yield of <20%.…”

Section: Resultsmentioning

confidence: 99%

Superior Oxygen Electrocatalysis on RuSe_x Nanoparticles for Rechargeable Air Cathodes

Jang

Lee

Xiao

et al. 2017

Advanced Energy Materials

View full text Add to dashboard Cite

battery using oxygen as the cathode and a nonaqueous electrolyte would provide a step in energy density that could offer a commercially competitive electric vehicle; [1,2] but this realization requires (1) a cathode catalyst providing fast, reversible oxygen-reduction and oxygenevolution reactions (ORR and OER) on, respectively, discharge and charge; (2) a reversible alkali-metal anode. Here, we address the problem of catalyzing the reversible ORR/OER in a nonaqueous electrolyte.A catalyst for an air cathode is normally a nanoparticle (NP) on the surface of a porous, electron-conducting substrate that is impregnated by a liquid electrolyte; air or O 2 is bubbled through the liquid in the pores of the substrate. The ORR on discharge produces an insoluble Li 2 O 2 or Li 2 O product that must be transformed back to Li + and O 2 in the OER on charge, and Li 2 O 2 is more easily decomposed. However, the stability of the air cathode in an aprotic electrolyte has remained a problem. Thus, there have been many efforts to improve the cell performance and to understand the operating mechanism such as exploring suitable electrolytes, [3][4][5][6][7] separators, [8,9] and the role of electrocatalysts. [10][11][12][13][14] To date, the best cell performance and durability for the ORR/OER in a nonaqueous electrolyte has been achieved by employing a TiC cathode in dimethyl sulfoxide. [15] Here, we report a facile synthesis of RuSe x NPs on carbon that provide, in glyme as electrolyte, an air cathode with a better efficiency, capacity, and cyclability. Since an earlier study has identified defects in the carbon support of the electrocatalyst to be active centers for a reaction between the carbon and the electrolyte, [16] we have used conventional air-electrode materials, but have nucleated the electrocatalyst at the defects in the carbon substrate to block this source of cathode degradation.Polarizations of the ORR and OER increase the charging voltage V ch for the OER and decrease the discharge voltage V dis for the ORR, thereby reducing the efficiency V dis /V ch of electrical energy storage with an air electrode. Byon and coworkers [17] have shown that certain metallic and/or metal-oxide NPs are able to promote, in the ORR, formation of poorly crystallized Li 2 O 2 as a smooth coating on the surface of the NPs with a reduced overpotential (polarization) while carbon black does not. Therefore, we assume that the formation of an amorphous or small-grained Li 2 O 2 product of the ORR, which is preferred versus Li 2 O, can be deposited onto the surface of a NP catalyst, and catalytic NPs offer the largest catalytic surface A one-step, facile supercritical-ethanol-fluid synthesis of Se-modified Ru nanoparticles nucleated on carbon defects is reported, and it is demonstrated that these nanoparticles provide, with >70% efficiency at 1 A g −1 , a highly active and reversible oxygen-reduction/oxygen-evolution reaction on an air cathode in a nonaqueous electrolyte. The Se modification not only prevents Ru oxidation during charge/discha...

show abstract

“…[5][6][7] Thus, the exploration of nonnoble-metal catalysts with both high performance and durability is of great significance, and recognized as a top priority in providing key technological solutions for the commercialization of fuel cells. Many works have explored non-preciousmetal cathode catalysts, reporting on the use of metal-macrocycle complexes and their pyrolized derivatives, [8][9][10] transitional-metal clusters, [11,12] transitional-metal carbides and nitrides, [13,14] metal oxides, [15,16] the recently reported transitionmetal-carbon-nitrogen composites [17][18][19] and carbon-based catalysts, [20,21] and other strategies. Although much progress has been achieved, there are still challenges regarding both ORR activity and stability.…”

mentioning

confidence: 99%

A Nitrogen‐Doped Polyaniline Carbon with High Electrocatalytic Activity and Stability for the Oxygen Reduction Reaction in Fuel Cells

Zhong

Zhang

et al. 2012

ChemSusChem

View full text Add to dashboard Cite

With the rapid depletion of fossil fuels and increasingly worse environmental pollution caused the pursuit of environmentally friendly, "green" energy sources, which would transform our economy and society into sustainable models, becomes ever more pertinent. Fuel cells, as new energy devices, have been recognized as one of several future technologies with the potential to resolve the above-mentioned environmental and energy issues because they offer advantages such as cleanliness, high energy efficiencies and power densities, low operating temperatures, and fast power generation from start-up. [1,2] In H 2 -O 2 fuel cells, the oxygen reduction reaction (ORR) at the cathode, which plays a key role in controlling the performance of a fuel cell, is more sluggish than the fast hydrogen oxidation reaction at the anode. [3,4] Until now, platinum and platinum alloys supported on carbon have been regarded as the best catalysts for the ORR because of their high activities and stabilities. However, the fundamental limitation in the supply of precious-metal platinum, which causes its very high cost, prohibits the large-scale production of platinum-based fuel cells. Moreover, the electrocatalytic activity of platinumbased catalysts deteriorates at high potentials due to increases of the particle size, metal dissolution, support corrosion, and deactivation by contaminants. [5][6][7] Thus, the exploration of nonnoble-metal catalysts with both high performance and durability is of great significance, and recognized as a top priority in providing key technological solutions for the commercialization of fuel cells. Many works have explored non-preciousmetal cathode catalysts, reporting on the use of metal-macrocycle complexes and their pyrolized derivatives, [8][9][10] transitional-metal clusters, [11,12] transitional-metal carbides and nitrides, [13,14] metal oxides, [15,16] the recently reported transitionmetal-carbon-nitrogen composites [17][18][19] and carbon-based catalysts, [20,21] and other strategies. Although much progress has been achieved, there are still challenges regarding both ORR activity and stability.Among these candidates, carbon nanomaterials doped with heteroatoms (e.g., nitrogen-, boron-, and phosphorus-doped) have received much attention as being among the most promising ORR catalysts because they have demonstrated high ORR activity and excellent stability in fuel cells. Gong et al. [21] reported that vertically aligned nitrogen-containing carbon nanotubes (VA-NCNTs) could present better electrocatalytic activity and stability in alkaline media than platinum supported on carbon and undoped carbon nanotubes. Liu et al. [22] demonstrated the high electrocatalytic activity, long-term stability, and excellent methanol tolerance of P-doped graphite layers, prepared by pyrolysis of toluene and triphenylphosphine (TPP), for the ORR in alkaline medium. Nitrogen-doped carbon has also been investigated as support for platinum-based catalysts. Sun et al. [23][24][25] demonstrated that nitrogen-doped-CNT-supported pl...

show abstract

Carbon‐Supported, Selenium‐Modified Ruthenium–Molybdenum Catalysts for Oxygen Reduction in Acidic Media

Cited by 28 publications

References 30 publications

Preparation and electrocatalytic property of three‐dimensional nano‐dendritic platinum oxide film

Preparation and electrocatalytic property of three‐dimensional nano‐dendritic platinum oxide film

Superior Oxygen Electrocatalysis on RuSe_x Nanoparticles for Rechargeable Air Cathodes

A Nitrogen‐Doped Polyaniline Carbon with High Electrocatalytic Activity and Stability for the Oxygen Reduction Reaction in Fuel Cells

Contact Info

Product

Resources

About

Carbon‐Supported, Selenium‐Modified Ruthenium–Molybdenum Catalysts for Oxygen Reduction in Acidic Media

Cited by 28 publications

References 30 publications

Preparation and electrocatalytic property of three‐dimensional nano‐dendritic platinum oxide film

Preparation and electrocatalytic property of three‐dimensional nano‐dendritic platinum oxide film

Superior Oxygen Electrocatalysis on RuSex Nanoparticles for Rechargeable Air Cathodes

A Nitrogen‐Doped Polyaniline Carbon with High Electrocatalytic Activity and Stability for the Oxygen Reduction Reaction in Fuel Cells

Contact Info

Product

Resources

About

Superior Oxygen Electrocatalysis on RuSe_x Nanoparticles for Rechargeable Air Cathodes