Radiolitically synthesized nano Ag/C catalysts for oxygen reduction and borohydride oxidation reactions in alkaline media, for potential applications in fuel cells

Stoševski, Ivan; Krstić, Jelena; Milikić, Jadranka; Šljukić, Biljana; Kačarević-Popović, Zorica; Mentus, Slavko; Miljanić, Šćepan S.

doi:10.1016/j.energy.2016.02.003

Cited by 53 publications

(23 citation statements)

References 78 publications

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“…Gamma radiation has been used to prepare unsupported AgNPs and Ag/C catalysts of variable Ag loading . The highest kinetic currents were achieved with catalysts containing no carbon and or only a low amount of carbon.…”

Section: Orr On Carbon‐supported Ag Nanoparticlesmentioning

confidence: 84%

Oxygen Reduction Reaction on Silver Catalysts in Alkaline Media: a Minireview

2018

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The development of efficient platinum‐free catalysts for electrocatalytic oxygen reduction reaction (ORR) is one of the main challenges in the fuel cell research. Silver‐based materials are highly active towards ORR in alkaline conditions and recent achievements in improving the performance of anion exchange membrane fuel cells (AEMFCs) have provoked many scientists to study these catalysts. This minireview is focused on the ORR performance of monometallic Ag catalysts and Ag‐based composites, the electrochemical oxygen reduction behaviour of Ag‐containing alloys is outside the scope of this review. The effect of the morphology of Ag nanostructures on catalysts’ ORR activity and pathway is discussed and the role of the support material is described. The performance of AEMFCs using Ag‐based cathode catalysts is also reviewed.

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Section: Orr On Carbon‐supported Ag Nanoparticlesmentioning

confidence: 84%

Oxygen Reduction Reaction on Silver Catalysts in Alkaline Media: a Minireview

2018

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“…The cyclic voltammograms (CV) measurements were conducted in N 2 and O 2 ‐saturated 0.1 M KOH solution at a scan rate of 50 mV s −1 (Figure ). Expect for the peak at 0.18 V (vs RHE) belonging to H adsorption region of Pt/C and the peak at 1.1 V corresponding to the reduction of Ag‐based catalysts, none of the other obvious redox peak in N 2 ‐saturated solution was observed for Pt/C, Ag/MWCNTs, and Ag/ZrO 2 /MWCNTs. However, in O 2 ‐saturated solution, Pt/C catalyst displays a remarkable oxygen reduction peak at 0.76 V, and the cathodic current density of Pt/C is −1.53 mA cm −2 .…”

Section: Resultsmentioning

confidence: 91%

Ag/ZrO₂/MWCNT Nanocomposite as Non‐Platinum Electrocatalysts for Enhanced Oxygen Reduction Reaction

et al. 2019

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Although the development of non‐platinum electrocatalysts for oxygen reduction reaction (ORR) has made some satisfactory progress, it is still a challenge to get a non‐platinum catalyst with higher activity and better stability. In this study, a novel non‐platinum catalyst composed of silver (Ag) nanoparticles and zirconia (ZrO2) coated on the multi‐walled carbon nanotubes (MWCNTs) catalyst (denoted as Ag/ZrO2/MWCNTs) is obtained by simple hydrothermal and photochemical methods. This catalyst shows more positive onset potential of 0.97 V (vs RHE), higher limiting current density of 6.4 mA cm−2 and lower H2O2 yield of 3.9 % than that of commercial platinum‐carbon (Pt/C) catalyst (0.93 V, 6.0 mA cm−2 and 4.8 % obtained from our test results). Electrochemical tests also show that ORR follows a four‐electron pathway. Moreover, the long‐term stability and methanol tolerance are also better compared with Pt/C. The results of theoretical calculations and the characterizations reveal that the enhanced ORR performance is attributed to the robust skeleton of MWCNTs benefitting for the uniform growth of ZrO2 and the improved conductivity of the catalyst, and the enhanced ability of Ag for O2 adsorption and OH desorption by the introduction of ZrO2. This work may serve as a reference to design and prepare the composite electrocatalysts with the high ORR performance.

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“…where j L and j K are the limiting current for the electrode reaction of reactive species by the diffusioncontrolled process and the kinetic current, respectively. F (96486.4 C mol −1 ) is the Faraday constant, n is the electron transfer number, C 0 * (1.2 × 10 −6 mol cm −3 ) is the concentration of O 2 in 0.1 M KOH solution, D 0 (1.9 × 10 −5 cm 2 s −1 ) is the diffusion coefficient of O 2 in 0.1 M KOH, ω (rad s −1 ) is rotation rate and v (0.01 cm 2 s −1 ) is the kinematic viscosity of the electrolyte [41,42].…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Nitrogen and Cobalt Co-Coped Carbon Materials Derived from Biomass Chitin as High-Performance Electrocatalyst for Aluminum-Air Batteries

Wang

Yang

et al. 2019

Catalysts

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Development of convenient, economic electrocatalysts for oxygen reduction reaction (ORR) in alkaline medium is of great significance to practical applications of aluminum-air batteries. Herein, a biomass chitin-derived carbon material with high ORR activities has been prepared and applied as electrocatalysts in Al-air batteries. The obtained cobalt, nitrogen co-doped carbon material (CoNC) exhibits the positive onset potential 0.86 V vs. RHE (reversible hydrogen electrode) and high-limiting current density 5.94 mA cm−2. Additionally, the durability of the CoNC material in alkaline electrolyte shows better stability when compared to the commercial Pt/C catalyst. Furthermore, the Al-air battery using CoNC as an air cathode catalyst provides the power density of 32.24 mW cm−2 and remains the constant discharge voltage of 1.17 V at 20 mA cm−2. This work not only provides a facile method to synthesize low-cost and efficient ORR electrocatalysts for Al-air batteries, but also paves a new way to explore and utilize high-valued biomass materials.

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Radiolitically synthesized nano Ag/C catalysts for oxygen reduction and borohydride oxidation reactions in alkaline media, for potential applications in fuel cells

Cited by 53 publications

References 78 publications

Oxygen Reduction Reaction on Silver Catalysts in Alkaline Media: a Minireview

Oxygen Reduction Reaction on Silver Catalysts in Alkaline Media: a Minireview

Ag/ZrO₂/MWCNT Nanocomposite as Non‐Platinum Electrocatalysts for Enhanced Oxygen Reduction Reaction

Nitrogen and Cobalt Co-Coped Carbon Materials Derived from Biomass Chitin as High-Performance Electrocatalyst for Aluminum-Air Batteries

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Radiolitically synthesized nano Ag/C catalysts for oxygen reduction and borohydride oxidation reactions in alkaline media, for potential applications in fuel cells

Cited by 53 publications

References 78 publications

Oxygen Reduction Reaction on Silver Catalysts in Alkaline Media: a Minireview

Oxygen Reduction Reaction on Silver Catalysts in Alkaline Media: a Minireview

Ag/ZrO2/MWCNT Nanocomposite as Non‐Platinum Electrocatalysts for Enhanced Oxygen Reduction Reaction

Nitrogen and Cobalt Co-Coped Carbon Materials Derived from Biomass Chitin as High-Performance Electrocatalyst for Aluminum-Air Batteries

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Ag/ZrO₂/MWCNT Nanocomposite as Non‐Platinum Electrocatalysts for Enhanced Oxygen Reduction Reaction