Facile synthesis based on novel carbon-supported cyanogel of structurally ordered Pd3Fe/C as electrocatalyst for formic acid oxidation

Liu, Zhenyuan; Fu, Gengtao; Li, Jiahui; Liu, Zhenqi; Xu, Lin; Sun, Dongmei; Tang, Yawen

doi:10.1007/s12274-018-2051-7

Cited by 67 publications

(49 citation statements)

References 49 publications

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“…All the current values were collected at an equal voltage scan rate of 50 mV s −1 . Categories of pure‐palladium nanomaterials, palladium alloys, palladium–carbon composites, and palladium‐catalyst promoter composites were included for comparison. Apparently, P‐PdNTA exhibits an overwhelming advantage in catalysis capability over other candidates, which fundamentally stems from the unique combination of a high electrochemical active surface area and a large population of active sites provided by the material, as well as facile substance exchange in the system.…”

Section: Resultsmentioning

confidence: 99%

Mesoporous Decoration of Freestanding Palladium Nanotube Arrays Boosts the Electrocatalysis Capabilities toward Formic Acid and Formate Oxidation

Ding

Zhi

Liu

et al. 2019

Advanced Energy Materials

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IntroductionWith the growing demand for green energy technologies, direct formic acid fuel cells (DFAFCs) [1,2] and direct formate fuel cells (DFFCs) [3,4] have drawn tremendous attention as promising clean energyconversion systems. Formic acid oxidation (FAO) and formate oxidation reaction (FOR) electrocatalysts largely determine the performance of DFAFCs and DFFCs; therefore, developing high-performance catalysts for FAO/FOR is critical for relevant fuel cell commercialization. [5][6][7] As an alternative to traditional platinum-based catalysts, [8] palladium-based catalysts for FAO/FOR attract increasing interest due to their relatively low cost, high activity in directly oxidizing fuels at relatively low potentials and high resistance to carbon monoxide poisoning. [9][10][11][12][13][14] Aiming at the superior FAO/FOR electrocatalysis capabilities with minimum noble metal usage, rationally establishing nanoscale architectures for Pd-based catalysts possessing high electrochemical active surface area, large areal density of catalytically active sites, and facile kinetics of substance exchange is a key step. [15][16][17][18][19][20][21] Achievement of all three qualities simultaneously is a significant challenge since these qualities are, to some extent, antagonistic. Nanosizing and porosity generation for bulk palladium catalysts are effective methodologies to increase the electrochemical active surface area and active site population. [22,23] However, substance transport becomes sluggish due to the low accessibility of the tortuous nanoporosity and the closed 3D geometric nanostructures. It is widely acknowledged that 1D nanotubes are a suitable nanoarchitecture for facile substance transport. [24][25][26][27][28] An open tube with a large diameter is highly beneficial for ion accessibility and diffusion. Various wet chemical methods have been attempted for palladium nanotube synthesis. [29][30][31] Nevertheless, most of these nanotube products were collected as piled-up powders. The inevitable nanotube agglomeration wastes the active surface area and diminishes the exposed catalytic active sites.The agglomeration issue could be effectively alleviated if the Pd nanotubes were aligned in parallel on the current collector substrate to form perpendicular Pd nanotube arrays (PdNTA).Fabricating high-performance electrocatalysts is the most critical step in commercializing direct formic acid or formate fuel cells. In this work, a dualtemplate electrodeposition method is used to create freestanding mesoporosity decorated palladium nanotube arrays (P-PdNTA) as a bifunctional electrocatalyst toward formic acid and formate oxidation (FAO/FOR). The phytantriol-based soft template modifies the superficial chemistry of aluminum anodic oxide inner surfaces, thereby facilitating the regulated electrodeposition of highly stable palladium nanotubes. The sacrifice of the soft template generates substantial mesoporosity on the nanotubes, resulting in a 189% increase in the electrochemically active surface area with respect to t...

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Section: Resultsmentioning

confidence: 99%

Mesoporous Decoration of Freestanding Palladium Nanotube Arrays Boosts the Electrocatalysis Capabilities toward Formic Acid and Formate Oxidation

Ding

Zhi

Liu

et al. 2019

Advanced Energy Materials

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“…All the current values were collected at 50 mV s −1 . Categories of nanostructured pure palladium catalysts, palladium‐based alloy catalysts, and palladium/carbon composite catalysts were included for comparison. Apparently, POM‐Pd‐20‐P01 exhibits an overwhelming advantage in FAO catalytic capability over the other candidates.…”

Section: Resultsmentioning

confidence: 99%

Tunable Periodically Ordered Mesoporosity in Palladium Membranes Enables Exceptional Enhancement of Intrinsic Electrocatalytic Activity for Formic Acid Oxidation

Ding

Liu

et al. 2020

Angewandte Chemie

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Developing superior electrocatalysts for formic acid oxidation (FAO) is the most crucial step in commercializing direct formic acid fuel cells. Herein, we electrodeposited palladium membranes with periodically ordered mesoporosity obtained by asymmetrically replicating the bicontinuous cubic phase structure of a lyotropic liquid‐crystal template. The Pd membrane with the largest periodicity and highest degree of order delivered up to 90.5 m2 g−1 of electrochemical active surface area and 3.34 A mg−1 electrocatalysis capability towards FAO, 3.8 and 7.8 times the values of the commercial Pd/C catalyst, respectively. By controlling the temperature and potential of the electrodeposition procedure, the periodicity area and order degree of the mesoporosity are highly tunable. These Pd membranes gave prototype formic acid fueled cells with 4.3 and 2.4 times the maximum current and power density of the commercial Pd/C catalyst.

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“…e essence of this overcoming lies in modulating the Pt-CO binding to mitigate the adsorption of CO on the Pt surface and enriching the Pt surface with oxygen containing moieties that facilitates the oxidative removal of poisoning CO at a relatively low potential. Interestingly, the use of hybrid nanocatalysts of Pt with Pd, Au, Ru, Rh, Bi, Sn, Co, Cu, and Ni or with transition metal oxides such as NiOx, CoOx, MnOx, and Cu 2 O for FAO succeeded to provide a proof for this conception [24][25][26][27][28][29][30]. e current investigation suggests a low-priced and efficient FeOx/Pt nanocatalyst for FAO.…”

Section: Introductionmentioning

confidence: 89%

Bifunctional Tailoring of Platinum Surfaces with Earth Abundant Iron Oxide Nanowires for Boosted Formic Acid Electro-Oxidation

Al-Qodami

Farrag

Sayed

et al. 2018

Journal of Nanotechnology

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To expedite the marketing of direct formic acid fuel cells, a peerless inexpensive binary FeOx/Pt nanocatalyst was proposed for formic acid electro-oxidation (FAO). The roles of both catalytic ingredients (FeOx and Pt) were inspired by testing the catalytic performance of FAO at the FeOx/Au and FeOx/GC analogies. The deposition of FeOx proceeded electrochemically with a post‐activating step that identified the catalyst’s structure and performance. With a proper adaptation for the deposition and activation processes, the FeOx/Pt nanocatalyst succeeded to mitigate the typical CO poisoning that represents the principal element deteriorating the catalytic performance of the direct formic acid fuel cells. It also provided a higher (eightfold) catalytic efficiency than the bare Pt substrates toward FAO with a much better durability. Field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD) were all employed to inspect, respectively, the surface morphology, bulk composition, and crystal structure of the catalyst. The electrochemical impedance spectra could correlate the charge transfer resistances for FAO over the inspected set of catalysts to explore the role of FeOx in mediating the reaction mechanism.

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Facile synthesis based on novel carbon-supported cyanogel of structurally ordered Pd3Fe/C as electrocatalyst for formic acid oxidation

Cited by 67 publications

References 49 publications

Mesoporous Decoration of Freestanding Palladium Nanotube Arrays Boosts the Electrocatalysis Capabilities toward Formic Acid and Formate Oxidation

Mesoporous Decoration of Freestanding Palladium Nanotube Arrays Boosts the Electrocatalysis Capabilities toward Formic Acid and Formate Oxidation

Tunable Periodically Ordered Mesoporosity in Palladium Membranes Enables Exceptional Enhancement of Intrinsic Electrocatalytic Activity for Formic Acid Oxidation

Bifunctional Tailoring of Platinum Surfaces with Earth Abundant Iron Oxide Nanowires for Boosted Formic Acid Electro-Oxidation

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