Tailoring the ions and bandgaps in a novel semi-ionic energy conversion device for electrochemical performance

Zahra, Moquddsa; Raza, Rizwan; Ali, Amjad; Mushtaq, Naveed; Ahmad, Muhammad; Shakir, Imran; Abbas, Qaisar; Akbar, Muhammad

doi:10.1016/j.mtener.2020.100536

Cited by 4 publications

(2 citation statements)

References 33 publications

(29 reference statements)

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“…The electrical band-gap values are always higher than optical band-gap values 38 and can be calculated from the activation energy using eq 5 = E electrical band gap 2 a (5) Therefore, the electrical band gaps for LiNiO 2−δ −SiC (1:0.1), LiNiO 2−δ −SiC (1:0.2), LiNiO 2−δ −SiC (1:0.3), LiNiO 2−δ −SiC (1:0.4), and LiNiO 2−δ −SiC (1:0.5) are found out to be 1.04, 1, 0.84, 0.96, and 0.86 eV, respectively. The result shows that the activation energy and band gap decrease with increasing percentage of SiC in the composite material.…”

Section: Resultsmentioning

confidence: 91%

“…The activation energy was determined using the Arrhenius equation and the conductivity data Here, σ is the conductivity of the pellet, σ o is the pre-exponential constant, E a is the activation energy, R is the general gas constant, and T is the temperature in kelvin. The equation can be modified as The electrical band-gap values are always higher than optical band-gap values and can be calculated from the activation energy using eq 5 Therefore, the electrical band gaps for LiNiO 2−δ –SiC (1:0.1), LiNiO 2−δ –SiC (1:0.2), LiNiO 2−δ –SiC (1:0.3), LiNiO 2−δ –SiC (1:0.4), and LiNiO 2−δ –SiC (1:0.5) are found out to be 1.04, 1, 0.84, 0.96, and 0.86 eV, respectively. The result shows that the activation energy and band gap decrease with increasing percentage of SiC in the composite material.…”

Section: Results and Discussionmentioning

confidence: 99%

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Catalytic Effect of Silicon Carbide on the Composite Anode of Fuel Cells

Sarfraz

Ali

Ahmad

et al. 2021

ACS Appl. Energy Mater.

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High efficiency, fuel flexibility, and sustainable energy conversion make fuel cells attractive compared to conventional energy systems. The direct ethanol fuel cells have attracted much attention because of the direct utilization of ethanol fuel. Anode materials are required to enhance the catalytic activity of the liquid fuel, which oxidize the fuel at lower operating temperature. Therefore, the catalytic effect using silicon carbide has been investigated in the LiNiO2−δ anode. The material has been characterized, and it is found that SiC shows a cubic structure and LiNiO2−δ exhibits a hexagonal structure, while the LiNiO2−δ–SiC composite exhibits a mixed cubic and hexagonal phase. Scanning electron microscopy depicts that the material is porous. The Fourier transform infrared spectroscopy analysis shows the presence of Si–O–Si, Si–C, CO, and Si–OH bonding. The LiNiO2−δ–SiC composite (1:0.3) exhibited a maximum electrical conductivity of 1.34 S cm–1 at 650 °C with an electrical band gap of 0.84 eV. The fabricated cell with the LiNiO2−δ–SiC anode exhibits a power density of 0.20 W cm–2 at 650 °C with liquid ethanol fuel. The results show that there is a promising catalytic activity of SiC in the fuel cell anode.

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Section: Resultsmentioning

confidence: 91%