A novel Ir/CeO<sub>2</sub>–C nanoparticle electrocatalyst for the hydrogen oxidation reaction of alkaline anion exchange membrane fuel cells

Qin, Bowen; Yu, Hongmei; Chen, Jun; Jia, Jia; Gao, Xudong; Yao, Dewei; Yi, Baolian; Shao, Zhigang

doi:10.1039/c7ra03675b

Cited by 51 publications

(23 citation statements)

References 33 publications

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“…) and Ir/C (0.16 mA lg Ir À1 ) and most of the reported state-of-the-art HOR catalysts ( Fig. 2d and Table S2 online) [23,[38][39][40][41][42][43][44][45].…”

mentioning

confidence: 87%

“…The exchange current densities (j 0 ) of the three catalysts can be calculated by the Butler-Volmer equation [10], with the values of 1.56 mA cm Ir -2 for IrWO x / C, which is much higher than that of Ir/C (0.64 mA cm Ir -2 ), and Pt/C (0.69 mA cm Pt -2 ), as well as most of documented HOR catalysts as indicated in Fig. 2d and Table S2 (online) [23,[38][39][40][41][42][43][44][45]. Similarly, linear fittings of micropolarization region (between -5 to +5 mV) via the approximate Butler-Volmer equation could also obtain the values of the exchange current densities [22], with 1.52 mA cm Ir À2 for IrWO x /C, 0.64 mA cm Ir À2 for Ir/C, and 0.66 mA cm Pt À2 for Pt/C, as shown in Fig.…”

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confidence: 98%

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Discrepant roles of adsorbed OH* species on IrWO for boosting alkaline hydrogen electrocatalysis

Yang

et al. 2020

Science Bulletin

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“…) and Ir/C (0.16 mA lg Ir À1 ) and most of the reported state-of-the-art HOR catalysts ( Fig. 2d and Table S2 online) [23,[38][39][40][41][42][43][44][45].…”

mentioning

confidence: 87%

mentioning

confidence: 98%

Discrepant roles of adsorbed OH* species on IrWO for boosting alkaline hydrogen electrocatalysis

Yang

et al. 2020

Science Bulletin

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“…Furthermore, the Ir/CeO 2 –C also displayed an enhanced activity due to the oxophilic effect caused by the higher oxygen storage–release capacity of CeO 2 . [ 40 ] To summarize, CeO 2 is able to modulate the coordination environment of active components or sites to be more suitable for adsorbing H* and OH * , and so promote HOR.…”

Section: Ceo2‐based Electrocatalystmentioning

confidence: 99%

A Review on Ceo₂‐Based Electrocatalyst and Photocatalyst in Energy Conversion

Song

Liang

et al. 2021

Adv Energy and Sustain Res

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The activation and conversion of small molecules (H2, O2, H2O, CO2, N2, CH3OH, and C2H5OH) in energy‐related systems has attracted researchers’ attentions around the world. The conversion of these molecules plays a key role in renewable energy storage and conversion systems, and for that, the electrocatalysis and photocatalysis processes are considered as clean and efficient strategies. Numerous materials are designed to promote the conversion process to satisfy the different requirements for efficiency and selectivity. Due to the flexible switching between Ce3+ and Ce4+ with rich oxygen defects, CeO2‐based materials display excellent performance in all the related reaction processes. Herein, the CeO2‐based electro(photo)catalysts according to different reactions are summarized. Specifically, the influence of material compositions, morphologies, and structures on catalytic performance is discussed, and the significant role of CeO2 is emphasized. Finally, several approaches are advocated to promote the development of CeO2‐based electro(photo)catalysis and accelerate their industrial application.

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“…The metal oxides were found beneficial for the HOR activity of Ir. The oxygen vacancy on the surface of the CeO2 can adsorb hydroxyl species to enhance HOR catalytic performance in base, and exchange current density, mass activity and specific activity of 10% Ir/CeO2-C are 2.4, 2.8 and 1.8 times that of 10% Ir/C, respectively 74 .…”

Section: Ir-based Catalystsmentioning

confidence: 99%

Cost-Effective Hydrogen Oxidation Reaction Catalysts for Hydroxide Exchange Membrane Fuel Cells

Xue¹,

Wang²,

Zhang³

et al. 2020

Acta Physico Chimica Sinica

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Fuel cells are clean, efficient energy conversion devices that produce electricity from chemical energy stored within fuels. The development of fuel cells has significantly progressed over the past decades. Specifically, polymer electrolyte fuel cells, which are representative of proton exchange membrane fuel cells (PEMFCs), exhibit high efficiency, high power density, and quick start-up times. However, the high cost of PEMFCs, partially from the Pt-based catalysts they employ, hinders their diverse applicability. Hydroxide exchange membrane fuel cells (HEMFCs), which are also known as alkaline polymer electrolyte fuel cells (APEFCs), alkaline anionexchange membrane fuel cells (AAEMFCs), anion exchange membrane fuel cells (AEMFCs), or alkaline membrane fuel cells (AMFCs), have attracted much attention because of their capability to use non-Pt electrocatalysts and inexpensive bipolar plates. The HEMFCs are structurally similar to PEMFCs but they use a polymer electrolyte that conducts hydroxide ions, thus providing an alkaline environment. However, the relatively sluggish kinetics of the hydrogen oxidation reaction (HOR) inhibit the practical application of HEMFCs. The anode catalyst loading needed for HEMFCs to achieve high cell performance is larger than that required for other fuel cells, which substantially increases the cost of HEMFCs. Therefore, low-cost, highly active, and stable HOR catalysts in the alkaline condition are greatly desired. Here, we review the recent achievements in developing such HOR catalysts. First, plausible HOR mechanisms are explored and HOR activity descriptors are summarized. The HOR processes are mainly controlled by the binding energy between hydrogen and the catalysts, but they may also be influenced by OH adsorption, interfacial water adsorption, and the potential of zero (free) charge. Next, experimental methods used to elevate HOR activities are introduced, followed by HOR catalysts reported in the literature, including Pt-, Ir-, Pd-, Ru-, and Ni-based catalysts, among others. HEMFC performances when employing various anode catalysts are then summarized, where HOR catalysts with platinum-group metals exhibited the highest HEMFC performance. Although the Ni-based HOR catalyst activity was higher than those of other non-precious metalbased catalysts, they showed unsatisfactory performance in HEMFCs. We further analyzed HEMFC performances while considering anode catalyst cost, where we found that this cost can be reduced by using recently developed, non-Pt HOR catalysts, especially Ru-based catalysts. In fact, an HEMFC using a Ru-based HOR catalyst showed an anode catalyst cost-based performance similar to that of PEMFCs, making the HEMFC promising for use in practical applications. Finally, we proposed routes for developing future HOR catalysts for HEMFCs.

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A novel Ir/CeO₂–C nanoparticle electrocatalyst for the hydrogen oxidation reaction of alkaline anion exchange membrane fuel cells

Abstract: A novel catalyst, 10% Ir/CeO2–C, shows better activity and durability for hydrogen oxidation reaction in base than that of 10% Ir/C. It would benefit from the oxophilic effect of ceria and the strong metal–support interaction between Ir and CeO2.

Cited by 51 publications

References 33 publications

Discrepant roles of adsorbed OH* species on IrWO for boosting alkaline hydrogen electrocatalysis

Discrepant roles of adsorbed OH* species on IrWO for boosting alkaline hydrogen electrocatalysis

A Review on Ceo₂‐Based Electrocatalyst and Photocatalyst in Energy Conversion

Cost-Effective Hydrogen Oxidation Reaction Catalysts for Hydroxide Exchange Membrane Fuel Cells

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A novel Ir/CeO2–C nanoparticle electrocatalyst for the hydrogen oxidation reaction of alkaline anion exchange membrane fuel cells

Abstract: A novel catalyst, 10% Ir/CeO2–C, shows better activity and durability for hydrogen oxidation reaction in base than that of 10% Ir/C. It would benefit from the oxophilic effect of ceria and the strong metal–support interaction between Ir and CeO2.

Cited by 51 publications

References 33 publications

Discrepant roles of adsorbed OH* species on IrWO for boosting alkaline hydrogen electrocatalysis

Discrepant roles of adsorbed OH* species on IrWO for boosting alkaline hydrogen electrocatalysis

A Review on Ceo2‐Based Electrocatalyst and Photocatalyst in Energy Conversion

Cost-Effective Hydrogen Oxidation Reaction Catalysts for Hydroxide Exchange Membrane Fuel Cells

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Product

Resources

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A novel Ir/CeO₂–C nanoparticle electrocatalyst for the hydrogen oxidation reaction of alkaline anion exchange membrane fuel cells

A Review on Ceo₂‐Based Electrocatalyst and Photocatalyst in Energy Conversion