Development of non-noble Co–N–C electrocatalyst for high-temperature proton exchange membrane fuel cells

Eren, Enis Oğuzhan
Özkan, Necati
Devrim, Yılser
© 2020 Hydrogen Energy Publications LLCThe development of a non-noble Co–N/MWCNT (MWCNT = multi-walled carbon nanotubes) electrocatalyst is achieved through the high-temperature pyrolysis method and successfully characterized by five-step physico-chemical analysis. By utilizing high-resolution analytical surface characterization methods, the chemical states of elements are determined, and the presence of Co-Nx sites is confirmed. ORR activity of a Co–N/MWCNT is found to be auspicious. The maximum number of transferred-electron (n) and the diffusion-limiting current density (jd) are calculated as 3.95 and 4.53 mA· cm−2, respectively. The catalyst is further evaluated under a single-cell test station. The test results show that the current and power density values of Co–N/MWCNT are found superior to those of the commercial Pt/C at the 150 °C and 160 °C (e.g., 57 vs. 69 mW· cm−2 at 150 °C). Due to some stability issues, it is observed that the performance of the Co–N/MWCNT catalyst is slightly decreased while switching the temperature towards 180 °C.
International Journal of Hydrogen Energy


Enhancement of hydrogen storage capacity of multi-walled carbon nanotubes with palladium doping prepared through supercritical CO2 deposition method
ERÜNAL, EBRU; Ulusal, Fatma; ASLAN, MUSTAFA YASİN; GÜZEL, BİLGEHAN; Üner, Deniz (Elsevier BV, 2018-06-07)
Pd doped Multi-Walled Carbon Nanotubes were prepared via supercritical carbon dioxide deposition method in order to enhance the hydrogen uptake capacity of carbon nanotubes at ambient conditions. A new bipyridyl precursor that enables reduction at moderate conditions was used during preparation of the sample. Both XRD analyses and TEM images confirmed that average Pd nanoparticle size distribution was around 10 nm. Hydrogen adsorption and desorption experiments at room temperature with very low pressures (0...
The effect of hydrogen on the electronic, mechanical and phonon properties of LaMgNi4 and its hydrides for hydrogen storage applications
Baysal, M. B.; SÜRÜCÜ, GÖKHAN; DELİGÖZ, ENGİN; ÖZIŞIK, HAVVA (Elsevier BV, 2018-12-27)
Density functional theory calculations are used herein to explore the effect of hydrogen on the electronic, mechanical and phonon properties of LaMgNi4 and its hydrides. The polycrystalline elastic moduli, Poisson's ratios and Debye temperatures are calculated based on the single-crystal elastic constants and Voigt-Reuss-Hill approximations. It is also found that all these materials are metallic behavior, ductile and anisotropic in nature. The mechanical anisotropy is discussed via several anisotropy indice...
Development and characterization of layered Li(NixMnyCo1-x-y)O-2 cathode materials for lithium ion batteries
Piskin, Berke; Aydınol, Mehmet Kadri (Elsevier BV, 2016-06-22)
The structure of the layered Li(NixMnyCo1-x-y)O-2 in different amounts of x and y ranging between 0.2 and 0.6, have been synthesized and investigated by powder X-ray diffraction and electron microscopy techniques. In the current work spray pyrolysis was used to obtain spherical fine-sized morphology followed by heat treatment to obtain better electrochemical activity. The precursor powders were prepared using aqueous solution via spray pyrolysis. Synthesized samples were then heat treated at 850 degrees C. ...
Fundamentals of hydrogen storage processes over Ru/SiO2 and Ru/Vulcan
ASLAN, MUSTAFA YASİN; Üner, Deniz (Elsevier BV, 2019-07-12)
Hydrogen adsorption and desorption over Ru/SiO2 and Ru/Vulcan are investigated in terms of hydrogen storage and release characteristics by both dynamic and static experiments. Ru particle dispersions as a function of metal loading were determined by HR-TEM and volumetric chemisorption experiments. Vulcan was more accommodating for spillover hydrogen than SiO2. High Ru dispersions, i.e., small particle sizes, favored the amount of hydrogen spillover to Vulcan, as revealed by temperature programmed desorption...
Design of an outdoor stacked - tubular reactor for biological hydrogen production
KAYAHAN, Emine; Eroglu, Inci; Koku, Harun (Elsevier BV, 2016-11-02)
Photofermentation is one alternative to produce hydrogen sustainably. The photobioreactor design is of crucial importance for an economically feasible operation, and an optimal design should provide uniform velocity and light distribution, low pressure drop, low gas permeability and efficient gas-liquid separation. A glass, stacked tubular bioreactor aimed at satisfying these criteria has been designed for outdoor photofermentative hydrogen production by purple non sulfur bacteria. The design consists of 4 ...
Citation Formats
E. O. Eren, N. Özkan, and Y. Devrim, “Development of non-noble Co–N–C electrocatalyst for high-temperature proton exchange membrane fuel cells,” International Journal of Hydrogen Energy, pp. 33957–33967, 2020, Accessed: 00, 2020. [Online]. Available: