Surface engineering of nano-ceria facet dependent coupling effect on Pt nanocrystals for electro-catalysis of methanol oxidation reaction

Chen, Wushuang; Xue, Jia; Bao, Yufei; Feng, Ligang

doi:10.1016/j.cej.2019.122752

Cited by 97 publications

(50 citation statements)

References 53 publications

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“…The resulted alloyed catalyst exhibited superior catalytic performance to that of its single counterpart, because of the electronic modification resulting from the lowed D-band center 12 . Moreover, the oxophilic property of the second element could readily promote the formation of oxygencontaining species at a low potential as interpreted by the bifunctional mechanism for the poisoning intermediates oxidation-removal 13,14 . That could be interpreted simply in the below mechanism for a Pd-M (metal) alloy catalyst.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

confidence: 99%

Formic Acid Electro-oxidation Catalyzed by PdNi/Graphene Aerogel

Bao¹,

Feng²

2020

Acta Physico Chimica Sinica

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“…[ 87 ] Meanwhile, Chen et al pointed out that the CeO 2 rod exposing (100)/(110) facets are responsible for the higher catalytic activity for MOR than CeO 2 plates and cubes in Pt/CeO 2 catalyst. [ 88 ] The higher Pt nanocrystals trapping ability and metal‐support interaction were considered to be responsible for the enhanced performance of Pt/CeO 2 rod. More interestingly, there is also physical interaction between Pt and CeO 2 , which allows Pt nanoparticles to highly disperse on CeO 2 .…”

Section: Ceo2‐based Electrocatalystmentioning

confidence: 99%

A Review on Ceo₂‐Based Electrocatalyst and Photocatalyst in Energy Conversion

Song

Liang

et al. 2021

Adv Energy and Sustain Res

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The activation and conversion of small molecules (H2, O2, H2O, CO2, N2, CH3OH, and C2H5OH) in energy‐related systems has attracted researchers’ attentions around the world. The conversion of these molecules plays a key role in renewable energy storage and conversion systems, and for that, the electrocatalysis and photocatalysis processes are considered as clean and efficient strategies. Numerous materials are designed to promote the conversion process to satisfy the different requirements for efficiency and selectivity. Due to the flexible switching between Ce3+ and Ce4+ with rich oxygen defects, CeO2‐based materials display excellent performance in all the related reaction processes. Herein, the CeO2‐based electro(photo)catalysts according to different reactions are summarized. Specifically, the influence of material compositions, morphologies, and structures on catalytic performance is discussed, and the significant role of CeO2 is emphasized. Finally, several approaches are advocated to promote the development of CeO2‐based electro(photo)catalysis and accelerate their industrial application.

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“…Therefore, alternative energy production methods gain great importance as energy consumption increases rapidly and fossil fuels will not meet the increasing demand 1 . Direct alcohol fuel cells (DAFCs) are considered as environmentally friendly energy generation systems and draw attention since they provide high efficiency, low working temperature 2,3 . Among the DAFCs, alkaline direct ethanol fuel cells (ADEFCs) are one of the most promising alternative energy generation systems.…”

Section: Introductionmentioning

confidence: 99%

“…One of the greatest advantages of this system is that it uses ethanol, which is an economical, carbon‐neutral fuel that can be produced in large quantities from biomass and agricultural products, easily transported, and stored. Other advantages of ethanol are namely high heat value, non‐toxicity, environmental compatibility, use in different energy converters, and low price 2‐6 …”

Section: Introductionmentioning

confidence: 99%

Molybdenum compound cocatalyzed Ni‐based anode electrocatalysts for EOR in alkaline media

Kazan

2021

Int J Energy Res

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Summary In this study, Mo2C and MoS2 were used as cocatalyst for a non‐noble metal for the first time for ethanol electro‐oxidation reaction (EOR) in alkaline media. Anode electrocatalysts containing Nickel, Mo compound, and carbon support were synthesized at different weight ratios of Ni and Mo2C (or MoS2) while keeping the carbon support weight constant in each catalyst combination to investigate the best weight ratio among our range. Physical characterizations of the electrocatalysts were investigated by XRD, XPS, SEM‐EDS, EDAX, and TEM techniques. Electrochemical performance of the catalysts was studied via cyclic voltammetry (CV), linear sweep voltammetry (LSV), and chronoamperometry (CA) by using a home‐made electrochemical cell test system exhibiting similar alkaline direct ethanol fuel cell (ADEFC) architecture by giving the opportunity of using an anion exchange membrane. All of the Ni‐Mo2C/C and Ni‐MoS2/C at different weight ratios were shown better performance than pristine Ni and Ni/C. The highest current density was measured with Ni‐Mo2C/C‐2 (11.4 mA cm−2) anode catalyst, which exhibits the highest electrochemical reaction rate. The diffusion coefficient of the catalysts was calculated by using the data from linear LSV. CA experiment results showed that the tolerance for catalytic poisoning and durability of Ni‐Mo2C/C‐2 was better among all the electrocatalysts. Highlights Literature survey showed that Mo2C and MoS2 are promising co‐catalysts for EOR. However, there is a lack of study on the use of Mo2C or MoS2 as co‐catalyst with a non‐noble metal. Molybdenum compound containing transition metal‐based anode electro‐catalysts were synthesized for EOR in alkaline media. A home‐made electrochemical cell is designed to make the system more similar to an ADEFC system. The results of the electrochemical characterizations are showed that the Mo compound addition increased the catalytic activity and stability.

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Surface engineering of nano-ceria facet dependent coupling effect on Pt nanocrystals for electro-catalysis of methanol oxidation reaction

Cited by 97 publications

References 53 publications

Formic Acid Electro-oxidation Catalyzed by PdNi/Graphene Aerogel

Formic Acid Electro-oxidation Catalyzed by PdNi/Graphene Aerogel

A Review on Ceo₂‐Based Electrocatalyst and Photocatalyst in Energy Conversion

Molybdenum compound cocatalyzed Ni‐based anode electrocatalysts for EOR in alkaline media

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Surface engineering of nano-ceria facet dependent coupling effect on Pt nanocrystals for electro-catalysis of methanol oxidation reaction

Cited by 97 publications

References 53 publications

Formic Acid Electro-oxidation Catalyzed by PdNi/Graphene Aerogel

Formic Acid Electro-oxidation Catalyzed by PdNi/Graphene Aerogel

A Review on Ceo2‐Based Electrocatalyst and Photocatalyst in Energy Conversion

Molybdenum compound cocatalyzed Ni‐based anode electrocatalysts for EOR in alkaline media

Contact Info

Product

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A Review on Ceo₂‐Based Electrocatalyst and Photocatalyst in Energy Conversion