New non-platinum Ir–V–Mo electro-catalyst, catalytic activity and CO tolerance in hydrogen oxidation reaction

Li, Bing; Higgins, Drew; Yang, Daijun; Lin, Rui; Yu, Zhuoping; Ma, Jie

doi:10.1016/j.ijhydene.2012.09.165

Cited by 14 publications

(17 citation statements)

References 37 publications

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“…At 0.1 V vs. RHE about 77 % higher current density was obtained for Ir-V-Mo/C (40:10:10) compared to that of a commercial Pt/C, and 282 % higher current density compared to that of pure Ir/C. [53] The increase of the HOR activity of Ir by the addition a second/third element can be explained by two ways: 1) metal addition prevent the Ir particles from aggregation and thus, more catalytically active sites could be achieved. This in turn facilitated the strong adsorption and activation of hydrogen molecules on the surface of Ir and hence, the enhancement of the activity of Ir for the HOR; 2) the increase in Ir surface area by the dissolution of M 1 an M 2 species in acid, leaving a porous structure.…”

Section: Hydrogen Oxidation On Pt-free Ir and Ir-based Catalystsmentioning

confidence: 86%

“…[52] Ir particles tend to aggregate, decreasing the catalyst surface area, and, as a consequence the HOR activity. [52][53][54][55][56][57][58][59] Ir-M 1 /C and Ir-M 1 -M 2 /C catalysts were tested as anode materials in PEMFCs. [52][53][54][55][56][57][58][59] Ir-M 1 /C and Ir-M 1 -M 2 /C catalysts were tested as anode materials in PEMFCs.…”

Section: Hydrogen Oxidation On Pt-free Ir and Ir-based Catalystsmentioning

confidence: 99%

“…[52][53][54][55][56][57][58][59] Ir-M 1 /C and Ir-M 1 -M 2 /C catalysts were tested as anode materials in PEMFCs. [53] The increase of the HOR activity of Ir by the addition a second/third element can be explained by two ways: 1) metal addition prevent the Ir particles from aggregation and thus, more catalytically active sites could be achieved. The MPD ratio almost linearly increased with increasing (M 1 + M 2 ) content in the catalysts.…”

Section: Hydrogen Oxidation On Pt-free Ir and Ir-based Catalystsmentioning

confidence: 99%

“…The MPD ratio almost linearly increased with increasing (M 1 + M 2 ) content in the catalysts. [53] Surface mobile oxygen species from Mo promote the oxidation of CO adsorbed on IrV active sites to CO 2 . [53] The increase of the HOR activity of Ir by the addition a second/third element can be explained by two ways: 1) metal addition prevent the Ir particles from aggregation and thus, more catalytically active sites could be achieved.…”

Section: Hydrogen Oxidation On Pt-free Ir and Ir-based Catalystsmentioning

confidence: 99%

“…[52] The addition of a second (M 1 = V,Co) and a third (M 2 = W,Mo) element increases the HOR activity of Ir. [52][53][54][55][56][57][58][59] Ir-M 1 /C and Ir-M 1 -M 2 /C catalysts were tested as anode materials in PEMFCs. Figure 3 shows the dependence of Ir-M 1 -M 2 /C to Ir/C PEMFC maximum power density ratio on (M 1 + M 2 )/(Ir+M 1 +M 2 ) atomic ratio.…”

Section: Hydrogen Oxidation On Pt-free Ir and Ir-based Catalystsmentioning

confidence: 99%

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Iridium Application in Low‐Temperature Acidic Fuel Cells: Pt‐Free Ir‐Based Catalysts or Second/Third Promoting Metal in Pt‐Based Catalysts?

Antolini¹

2013

ChemElectroChem

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Pt and Ir have similar properties, that is, same period and block (6d) of the periodic table, same fcc crystal structure, similar mass and atomic size. The cost of iridium, however, is ca. 60 % lower than that of platinum, so it could be a good substitute for Pt as a catalyst in fuel cells, also if it has to be taken into account that a large use of iridium in fuel cells could noticeably increase its price. Moreover, iridium is stable towards dissolution in acid medium. For these reasons, Pt‐free Ir‐based catalysts and Ir‐containing Pt‐based catalysts have been tested both as anode and cathode materials in low‐temperature acid fuel cells. In this work an overview of the application of Ir and Ir‐containing catalysts as anode materials for hydrogen, methanol and ethanol oxidation, and as cathode materials for oxygen reduction in low‐temperature polymer electrolyte fuel cells fuelled with hydrogen or low molecular weight alcohols, is presented. The more suitable application of iridium in fuel cell electrodes, either as non‐Pt Ir‐based catalysts, maintaining an acceptable catalytic activity, or as co‐catalysts in Pt‐based materials, to increase fuel cell performance simultaneously to a slight decrease of the cost, is discussed.

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Section: Hydrogen Oxidation On Pt-free Ir and Ir-based Catalystsmentioning

confidence: 86%