Distinct influence for carbon nano-morphology on the activity and optimum metal loading of Ni/C composite used for ethanol oxidation

Barakat, Nasser A.M.; Moustafa, Hager M.; Nassar, Mamdouh M.; Abdelkareem, Mohammad Ali; Mahmoud, Mohamed S.; Almajid, Abdulhakim A.; Khalil, Khalil Abdelrazek

doi:10.1016/j.electacta.2015.09.079

Cited by 34 publications

(14 citation statements)

References 59 publications

(73 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Accordingly, pristine Ni has the lowest diffusion coefficient. Barakat et al 12 calculated the diffusion coefficient for Ni‐C nanoparticles as 3.68 × 10 −11 cm 2 s −1 which is lower than our calculated diffusion coefficient of Ni/C and Esghi et al 82 calculated the diffusion coefficient for noble metal containing Pd‐Ni‐Fe/MnO 2 /Vulcan electro‐catalysts as 1.72×10 −9 cm 2 s −1 in alkaline medium. Obviously, our sample's diffusion coefficients are higher than those values and as the diffusion coefficient value increases, the reaction kinetics increases, consequently it would be easier to control the diffusion.…”

Section: Resultscontrasting

confidence: 75%

See 1 more Smart Citation

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

Kazan

2021

Int J Energy Res

View full text Add to dashboard Cite

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.

show abstract

Section: Resultscontrasting

confidence: 75%

“…Accordingly, Ni‐based materials can be considered as an effective electro‐catalyst for ethanol oxidation. In order to increase the EOR performance of Ni, various cocatalysts were considered in literature 10‐24 …”

Section: Introductionmentioning

confidence: 99%

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

Kazan

2021

Int J Energy Res

View full text Add to dashboard Cite

show abstract

“…However, the border reduction peak during the negative scan is ascribed to the renewed oxidation of the ethanol. Normally, a metal-based catalyst requires surface activation by the formation of the MOOH compound by consecutive cyclic voltammetry cycles [40]. Therefore, redox peaks are observed which shows the formation of MOOH.…”

Section: Electrochemical Measurementmentioning

confidence: 99%

Electrooxidation behavior of ethanol toward carbon microbead-encapsulated ZnO particles derived from coffee waste

Ghouri

Elsaid

Abdel‐Wahab

et al. 2020

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Carbon microbead-encapsulated ZnO (CM-ZnO) particles have been synthesized from the spent coffee ground (SCG) by chemical activation with ZnCl 2 followed by calcination at 700 ℃ in N 2 environment. Interestingly, ZnCl 2 can act as an activating agent as well as a precursor for ZnO particles. The structure of the core and shell of the CM-ZnO was investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. Moreover, X-ray diffraction (XRD) and energy-dispersive spectroscopy (EDS) studies confirmed the presence of the encapsulated ZnO particles. The Brunauer-Emmett-Teller (BET) and Barrett-Joyner-Halenda (BJH) plots showed a well-developed porous structure with a specific surface area of 210 m 2 /g, average pore volume of 1.12 cm 3 /g, and an average pore radius of 31.7 Å. The electrooxidation behavior of ethanol toward the synthesized CM-ZnO was then studied using cyclic voltammetry (CV) technique. For comparison, two types of modified electrodes were prepared: the first one with the non-activated SCG and the second one with the CM-ZnO. The electrochemical measurements of the prepared CM-ZnO demonstrated higher electrocatalytic activity with a current density of ~ 35 mA/cm 2 at 0.4 V vs. Ag/AgCl for ethanol electrooxidation in an alkaline medium. The electrochemical measurements specified that the presence of ZnO particles and the high surface area of the activated sample have a significant influence on electrooxidation activity. Therefore, the introduced CM-ZnO particles could be an alternative and effective non-precious electrocatalyst for ethanol electrooxidation.

show abstract

“…Nickel-based materials have been employed for the electrocatalytic ethanol oxidation [6][7][8][9] due to their low cost and high stability in alkaline media. Some strategies to enhance the overall catalytic activity for alcohol oxidation involve the exfoliation of the nickel layered hydroxide [6] in order to generate more reactive sites and expose a higher number of them to the solution, the synthesis of nanostructured materials with controlled shape [10,11] or the use of effective catalyst supports such as carbon nanoflakes [12,13] or nanofibers [14]. The incorporation of other metal atoms to the nickel (oxy)hydroxide (NiO x H y ) structure is also a known method to change the catalytic properties of the material [15].…”

Section: Introductionmentioning

confidence: 99%

Effects of Incorporated Iron or Cobalt on the Ethanol Oxidation Activity of Nickel (Oxy)Hydroxides in Alkaline Media

2019

View full text Add to dashboard Cite

Nickel (oxy)hydroxides (NiO x H y) are promising cost-effective materials that exhibit a fair catalytic activity for the ethanol oxidation reaction (EOR) and could be used for sustainable energy conversion. Doping the NiO x H y structure with other metals could lead to enhanced catalytic properties but more research needs to be done to understand the role of the doping metal on the EOR. We prepared NiO x H y films doped with Fe or Co with different metallic ratios by electrodeposition and evaluated the EOR. We found a positive and negative effect on the catalytic activity after the incorporation of Co and Fe, respectively. Our results suggest that Ni atoms are the active sites for the EOR since Tafel slopes were similar on the binary and pristine nickel (oxy)hydroxides and that the formal potential of the Ni(II)/Ni(III) redox couple is a good descriptor for the EOR activity. This work also highlights the importance of controlled metal doping on catalysts and may help in the design and development of improved materials for the EOR.

show abstract

Distinct influence for carbon nano-morphology on the activity and optimum metal loading of Ni/C composite used for ethanol oxidation

Cited by 34 publications

References 59 publications

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

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

Electrooxidation behavior of ethanol toward carbon microbead-encapsulated ZnO particles derived from coffee waste

Effects of Incorporated Iron or Cobalt on the Ethanol Oxidation Activity of Nickel (Oxy)Hydroxides in Alkaline Media

Contact Info

Product

Resources

About