Pd/FeP catalyst engineering via thermal annealing for improved formic acid electrochemical oxidation

Bao, Yufei; Liu, Hui; Zong, Liu; Wang, Fulong; Feng, Ligang

doi:10.1016/j.apcatb.2020.119106

Cited by 117 publications

(53 citation statements)

References 57 publications

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“…In the first scan, the absence of hydrogen desorption peaks at the lower potential region confirms the successful adsorption of CO on the catalytic surface, and then the CO oxidation peaks are observed on all the electrodes. The CO oxidation peak disappears in the subsequent second CV scan meanwhile the hydrogen desorption peak recovers indicating the complete oxidation removal of the adsorbed CO on the surface of the catalyst [8]. The lower the oxidation potential, the higher the CO ad oxidation ability and the higher the antipoisoning ability.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

“…Pdbased catalysts are most commonly used because of the less poisoning problem during formic acid oxidation [4][5][6]. However, in such catalysts, the accumulation of poisoning species through long-term operation is unavoidable and can considerably decrease their catalytic performance [7,8]. High-performance catalysts with anti-poisoning ability are, therefore, urgently needed to advance fuel cell technology.…”

Section: Introductionmentioning

confidence: 99%

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PdNi/N-doped graphene aerogel with over wide potential activity for formic acid electrooxidation

Bao

Zha

Sun

et al. 2021

Journal of Energy Chemistry

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Section: Electrochemical Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

PdNi/N-doped graphene aerogel with over wide potential activity for formic acid electrooxidation

Bao

Zha

Sun

et al. 2021

Journal of Energy Chemistry

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“…CO was purged into the H2SO4 solution when the working electrode was kept at 0 V (vs SCE) for 15 min to allow the complete adsorption of CO onto the catalyst, and excess CO in the electrolyte was purged out with N2 for 15 min. The amount of COad was evaluated by the integration of the COad stripping peak, assuming 420 μC•cm −2 of coulombic charge required for the oxidation of adsorbed CO monolayer 30,31 . The electrochemically active surface area (ECSA) could be calculated with the following equation:…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Formic Acid Electro-oxidation Catalyzed by PdNi/Graphene Aerogel

Bao¹,

Feng²

2020

Acta Physico Chimica Sinica

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Direct formic acid fuel cells involve two significant half-reactions, namely formic acid electro-oxidation and oxygen reduction reaction, and the more sluggish and complex process for anode formic acid oxide also determine the whole fuel cells energy conversion efficiency. The most efficient catalysts rely on the noble metal of Pt and Pd based catalysts and compared with Pt catalysts, Pd catalyst is more appealing because of the low CO poisoning effect during the electro-oxidation of formic acid that mainly follows the direct pathway. The Pd alloy effect and support effect should be considered for the catalyst fabrication since the resulted structure and electronic modification could largely increase the catalytic performance. Graphene emerges out as novel support while the easy agglomeration and destruction of pure graphene do not guarantee promising merits. In this work, we demonstrated the formic acid oxidation ability boosting by facile coupling PdNi alloy and 3D graphene aerogel (PdNi/GA) via a freezingdrying/thermal annealing reduction approach. The PdNi alloy crystal structure was well confirmed by the X-ray diffractions technique and the alloy nanoparticles were successfully anchored on the 3D graphene aerogel surface. The electrochemical performance was evaluated for formic acid oxidation in the acid electrolyte. The PdNi/GA catalyst displayed a larger peak current density of 136 mA•cm −2 , which was 2 and 3.45 times greater than Pd/GA (68 mA•cm −2 ) and Pd/C (39.4 mA•cm −2 ), respectively. The anti-CO poisoning ability was measured by CO stripping technique, and a low onset potential of 0.49 V was found on PdNi/GA catalyst, about 120 mV less than that of Pd/GA catalyst, indicating the oxophilic property of Ni to assist formic acid oxidation via the bi-functional mechanism. The oxidation peak potential of 0.67 V was observed on PdNi/GA, about 40 mV less than that of Pd/C catalyst, indicating the merits of 3D structure of graphene. Moreover, PdNi/GA catalyst had the highest mass activity of 1699 mA•mg −1 compared to Pd/GA (851 mA•mg −1 ) and Pd/C (537 mA•mg −1 ) catalysts. The specific activity of PdNi/GA was 2.6 mA•cm −2 , which was 1.94 and 2.7 times of Pd/GA (1.34 mA•cm −2 ) and Pd/C (0.96 mA•cm −2 ) catalysts. The highly improved catalytic performance could be due to the combined alloy and support effect. The PdNi/GA was a promising catalyst for application in the direct formic acid fuel cells.

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“…Recently, transition-metal phosphides can be used to promote the catalytic performance of the noble metal catalysts. [12][13][14][15][16][17] For example, Ni 2 P was first introduced into the catalyst of Pt nanoparticles supported on carbon, resulting in highly enhanced activity and durability for the electrooxidation of methanol. It was attributed to the modified electronic state of Pt.…”

Section: Introductionmentioning

confidence: 99%

“…Especially, the P (phosphorus) atoms play a key role in catalysis, which can draw electrons from metal atoms and hence regulating the electronic properties of transition‐metal. Recently, transition‐metal phosphides can be used to promote the catalytic performance of the noble metal catalysts [12–17] . For example, Ni 2 P was first introduced into the catalyst of Pt nanoparticles supported on carbon, resulting in highly enhanced activity and durability for the electrooxidation of methanol.…”

Section: Introductionmentioning

confidence: 99%

Highly Enhanced Methanol Electrooxidation on Pt/N−CNT‐Decorated FeP**

Yang

Zhang

et al. 2021

ChemElectroChem

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The electrooxidation of methanol -the anodic reaction of direct methanol fuel cells -suffers from slow kinetics. Here, we report an enhanced current density for a Pt catalyst supported on nitrogen-doped carbon nanotube (NÀ CNT) decorated FeP. X-ray photoelectron spectra show that the introduction of FeP increases the binding energy of the Pt nanoparticles. The results show that Pt/FeP 15% /NÀ CNT displays a 3.4 times higher forward peak current density compared to commercial Pt/C. The improved performance is attributed to a change in the electronic state of the Pt nanoparticles through the electronic interaction between Pt and FeP, evidenced by the mitigated CO poisoning.

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Pd/FeP catalyst engineering via thermal annealing for improved formic acid electrochemical oxidation

Cited by 117 publications

References 57 publications

PdNi/N-doped graphene aerogel with over wide potential activity for formic acid electrooxidation

PdNi/N-doped graphene aerogel with over wide potential activity for formic acid electrooxidation

Formic Acid Electro-oxidation Catalyzed by PdNi/Graphene Aerogel

Highly Enhanced Methanol Electrooxidation on Pt/N−CNT‐Decorated FeP**

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