Electrocatalytic oxidation of formic acid on Pd/CNTs nanocatalysts synthesized in special “non-aqueous” system

Yang, Pingping; Wei, Liuying; Xiao, Xiong; Zhou, Zhidu; Li, Jiaodi; Zhang, Yuanyuan; Yang, Nianjun; Fei, Junjie

doi:10.1016/j.jelechem.2021.115980

Cited by 9 publications

(8 citation statements)

References 50 publications

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“…Figure 1 a shows the XRD patterns of Pd 2 Ni 1 /CNTs and Pd/CNTs. The diffraction peak near 26° is caused by C(002) of the carrier [ 19 , 23 ]. Compared to the Pd diffraction peaks of Pd/CNTs (39.2°, 44.8°, 66.5°, and 79.8°), the Pd peaks of Pd 2 Ni 1 /CNTs shifted to the higher 2θ values (39.5°, 45.3°, 66.6°, and 80.3°), suggesting the formation of alloy [ 29 ].…”

Section: Resultsmentioning

confidence: 99%

“…Figure 2 a–c show the TEM and HRTEM images of Pd 2 Ni 1 /CNTs. The Pd 2 Ni 1 nanoclusters supported on MWCNTs are clear, and the spacing of Pd(111) crystal planes in Pd 2 Ni 1 /CNTs is 0.219 nm, while the value is (0.222 nm) in Pd/CNTs ( Figure S2 ), providing further evidence of alloying [ 23 ]. It is clear that the nanoclusters are made up of smaller nanoparticles, with gaps between them that allow formic acid molecules to be transported through them and oxidized [ 32 ].…”

Section: Resultsmentioning

confidence: 99%

“…Deep eutectic solvents (DES) are an analogue of ionic liquids, with many advantages, wide electrochemical window, high electroconductivity, non-toxicity, thermal stability, biodegradability, and negligible vapor pressure, in addition to other advantages [ 21 ]. Our group [ 19 , 22 , 23 , 24 , 25 ] has also concluded that this green solvent can effectively reduce the size of nanoparticles in previous research. In addition, some research groups have successfully prepared PdSn [ 26 ] and PdAg [ 27 ] catalysts in DES.…”

Section: Introductionmentioning

confidence: 86%

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A “Special” Solvent to Prepare Alloyed Pd2Ni1 Nanoclusters on a MWCNT Catalyst for Enhanced Electrocatalytic Oxidation of Formic Acid

et al. 2023

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Herein, an electrocatalyst with Pd2Ni1 nanoclusters, supporting multiwalled carbon nanotubes (MWCNTs) (referred to Pd2Ni1/CNTs), was fabricated with deep eutectic solvents (DES), which simultaneously served as reducing agent, dispersant, and solvent. The mass activity of the catalyst for formic acid oxidation reaction (FAOR) was increased nearly four times compared to a Pd/C catalyst. The excellent catalytic activity of Pd2Ni1/CNTs was ascribed to the special nanocluster structure and appropriate Ni doping, which changed the electron configuration of Pd to reduce the d-band and to produce a Pd–Ni bond as a new active sites. These newly added Ni sites obtained more OH− to release more effective active sites by interacting with the intermediate produced in the first step of FAOR. Hence, this study provides a new method for preparing a Pd–Ni catalyst with high catalytic performance.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 86%

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A “Special” Solvent to Prepare Alloyed Pd2Ni1 Nanoclusters on a MWCNT Catalyst for Enhanced Electrocatalytic Oxidation of Formic Acid

et al. 2023

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“…Fan et al have prepared high-performance Pt-based alloy catalysts by chemical reduction or electrochemistry method in DES that plays an important role in controlling the shape of the nanoparticles [ 38 , 39 ]. In our previous work, a series of Pt/Pd-based catalysts have been prepared using DES [ 21 , 24 , 40 , 41 ]. DES has been widely proved to be a green solvent for the preparation of high-performance catalysts.…”

Section: Introductionmentioning

confidence: 99%

Pt2CeO2 Heterojunction Supported on Multiwalled Carbon Nanotubes for Robust Electrocatalytic Oxidation of Methanol

et al. 2023

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Herein, we prepared Pt2CeO2 heterojunction nanocluster (HJNS) on multiwalled carbon nanotubes (MWCNTs) in deep eutectic solvents (DESs) which is a special class of ionic liquids. The catalyst was then heat-treated at 400 °C in N2 (refer to Pt2CeO2/CNTs-400). The Pt2CeO2/CNTs-400 catalyst showed remarkably improved electrocatalytic performance towards methanol oxidation reaction (MOR) (839.1 mA mgPt−1) compared to Pt2CeO2/CNTs-500 (620.3 mA mgPt−1), Pt2CeO2/CNTs-300 (459.2 mA mgPt−1), Pt2CeO2/CNTs (641.6 mAmg−1) (the catalyst which has not been heat-treated) and commercial Pt/C (229.9 mAmg−1). Additionally, the Pt2CeO2/CNTs-400 catalyst also showed better CO poisoning resistance (onset potential: 0.47 V) compared to Pt2CeO2/CNTs (0.56 V) and commercial Pt/C (0.58 V). The improved performance of Pt2CeO2/CNTs-400 catalyst is attributed to the addition of appropriate CeO2, which changed the electronic state around the Pt atoms, lowered the d-band of Pt atoms, formed more Ce-O-Pt bonds acting as new active sites, affected the adsorption of toxic intermediates and weakened the dissolution of Pt; on the other hand, with the assistance of thermal treatment at 400 °C, the obtained Pt2CeO2 HJNS expose more new active sites at the interface between Pt and CeO2 to enhance the electrochemical active surface area (ECSA) and the dehydrogenation process of MOR. Thirdly, DES is beneficial to the increase of the effective component Pt(0) in the carbonization process. The study shows a new way to construct high-performance Pt-CeO2 catalyst for the direct methanol fuel cell (DMFC).

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“…With these advantages, a good electrical conductivity, thermal stability, electrochemical stability, a negligible vapor pressure, non-toxicity and biodegradability, DES [ 33 , 34 , 35 ] was used as a green solvent to prepare catalysts. In our previous study, a series of Pt- and Pd-based high-performance catalysts were prepared using DES as the reaction solvent [ 36 , 37 , 38 , 39 , 40 ]. Fan et al prepared the alloy catalysts (PdSn [ 20 ], PtCo [ 34 ], PtCu [ 33 ], PtV [ 41 ], PtLa [ 42 ]) by a chemical reduction or electrochemistry method in DES, that plays an important role in controlling the shape of these nanocrystallines.…”

Section: Introductionmentioning

confidence: 99%

Pd3Co1 Alloy Nanocluster on the MWCNT Catalyst for Efficient Formic Acid Electro-Oxidation

et al. 2022

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In this study, the Pd3Co1 alloy nanocluster from a multiwalled carbon nanotube (MWCTN) catalyst was fabricated in deep eutectic solvents (DESs) (referred to Pd3Co1/CNTs). The catalyst shows a better mass activity towards the formic acid oxidation reaction (FAOR) (2410.1 mA mgPd−1), a better anti-CO toxicity (0.36 V) than Pd/CNTs and commercial Pd/C. The improved performance of Pd3Co1/CNTs is attributed to appropriate Co doping, which changed the electronic state around the Pd atom, lowered the d-band of Pd, formed a new Pd-Co bond act at the active sites, affected the adsorption of the toxic intermediates and weakened the dissolution of Pd; moreover, with the assistance of DES, the obtained ultrafine Pd3Co1 nanoalloy exposes more active sites to enhance the dehydrogenation process of the FAOR. The study shows a new way to construct a high-performance Pd-alloy catalyst for the direct formic acid fuel cell.

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Electrocatalytic oxidation of formic acid on Pd/CNTs nanocatalysts synthesized in special “non-aqueous” system

Cited by 9 publications

References 50 publications

A “Special” Solvent to Prepare Alloyed Pd2Ni1 Nanoclusters on a MWCNT Catalyst for Enhanced Electrocatalytic Oxidation of Formic Acid

A “Special” Solvent to Prepare Alloyed Pd2Ni1 Nanoclusters on a MWCNT Catalyst for Enhanced Electrocatalytic Oxidation of Formic Acid

Pt2CeO2 Heterojunction Supported on Multiwalled Carbon Nanotubes for Robust Electrocatalytic Oxidation of Methanol

Pd3Co1 Alloy Nanocluster on the MWCNT Catalyst for Efficient Formic Acid Electro-Oxidation

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