Influence of Solution pH on Pt Anode Catalyst in Direct Formic Acid Fuel Cells

Joo, Jiyong; Choun, Myounghoon; Jeong, Jaehoon; Lee, Jae Kwang

doi:10.1021/acscatal.5b01981

Cited by 26 publications

(13 citation statements)

References 22 publications

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“…Nevertheless, monometallic Pd is prone to deactivation with time because of surface poisoning in FA solution. The main tactic to tackle the problem is to form Pd-based alloy catalysts with a second metal or to form multicomponent Pd-based composite catalysts by taking advantage of the bifunctional, electronic, and/or geometric effects to improve the overall catalyst performance. − However, there is a large space to upgrade the activity and durability of the existing catalysts, especially when they are applied in real DFAFC environments . In addition, despite many fundamental investigations on the decomposition of FA at Pd bulk and film electrodes, , the least attention was directed to the practical Pd-based catalysts in a condition mimicking anode operation of a DFAFC.…”

Section: Introductionmentioning

confidence: 99%

“…7−11 However, there is a large space to upgrade the activity and durability of the existing catalysts, especially when they are applied in real DFAFC environments. 12 In addition, despite many fundamental investigations on the decomposition of FA at Pd bulk and film electrodes, 13,14 the least attention was directed to the practical Pd-based catalysts in a condition mimicking anode operation of a DFAFC. As a result, the correlation between the fundamental results and the DFAFC performance has not been wellestablished.…”

Section: Introductionmentioning

confidence: 99%

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Small Addition of Boron in Palladium Catalyst, Big Improvement in Fuel Cell’s Performance: What May Interfacial Spectroelectrochemistry Tell?

Jiang

Chang

Wang

et al. 2016

ACS Appl. Mater. Interfaces

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Direct formic acid fuel cell (DFAFC) with Pd-based catalyst anode is a promising energy converter to power portable devices. However, its commercialization is entangled with insufficient activity and poor stability of existing anode catalysts. Here we initially report that a DFAFC using facilely synthesized Pd-B/C with ca. 6 at. % B doping as the anode catalyst yields a maximum output power density of 316 mW cm(-2) at 30 °C, twice that with a same DFAFC using otherwise the state-of-the-art Pd/C. More strikingly, at a constant voltage of 0.3 V, the output power of the former cell is ca. 9 times as high as that of the latter after 4.5 h of continuous operation. In situ attenuated total reflection infrared spectroscopy is applied to probe comparatively the interfacial behaviors at Pd-B/C and Pd/C in conditions mimicking those for the DFAFC anode operation, revealing that the significantly improved cell performance correlates well with a substantially lowered CO accumulation at B-doped Pd surfaces.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Small Addition of Boron in Palladium Catalyst, Big Improvement in Fuel Cell’s Performance: What May Interfacial Spectroelectrochemistry Tell?

Jiang

Chang

Wang

et al. 2016

ACS Appl. Mater. Interfaces

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“…Due to the more negative potential an approximation of formate with the negative oxygen towards the solution and the C−H bond in direction to the surface might be favoured. Since the formate anion in this configuration is assumed to be the active precursor in the direct pathway,,,,, the potential shift to a more negative region might ease the formate oxidation in the described way.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Solution pH and Temperature on the Oscillatory Electro‐Oxidation of Formic Acid on Platinum

Hartl

Varela

2017

ChemistrySelect

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The effect of solution pH on the electro-oxidation of formic acid has been discussed in terms of the key role of solution HCOO À species on the third parallel pathway, besides the indirect oxidation via and a possible third pathway involving bridge-bonded formate. In this contribution we study the role of solution pH and temperature on the oscillatory electrooxidation of formic acid on platinum. Highest oxidation rates were found roughly from pH from 5 to 12, whereas no potential oscillations were recorded between pH 4 and 11, probably due to the very fast rates of the main current carrier step: the direct oxidation of solution formate. The decrease in the oxidation rates at high pH also results in the appearance of oscillations at pH 13 and 14, which were considerably distinct than those found in acidic media. The system was further studied from 25 to 50 o C at nine temperatures, and activation energies were estimated in all cases. Overall, the discussion was based in the fact that, under oscillatory regime, many reaction steps are simultaneously active and this is the cause of the peculiarities found in this system, in contrast to that under conventional conditions.[a] F.

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“…However, it is a long way to find other methods to realize their applications. We mentioned is commonly the formic acid oxidation under acid condition, the pH value of the solution become an important question in formic acid oxidation [21].So more efforts have to be done on further reduce the use of Pt and improve the activity of catalyst.…”

Section: Discussionmentioning

confidence: 99%