Browsing NTNU Open by Author "Pollet, Bruno"
Now showing items 61-77 of 77
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Sonoelectrochemistry: Both a tool for investigating mechanisms and for accelerating processes
Hihn, Jean-Yves; Doche, Marie-Laure; Hallez, Loïc; Et Taouil, Abdeslam; Pollet, Bruno (Journal article; Peer reviewed, 2018)Surface irradiation by power ultrasound has proven to offer beneficial effects not only for surface cleaning, but also for the modification of functional properties of metallic or organic coatings. However, the process ... -
Tailoring nanopores within nanoparticles of PtCo networks as catalysts for methanol oxidation reaction
Ding, Jieting; Ji, Shan; Wang, Hui; Pollet, Bruno; Wang, Rongfang (Journal article; Peer reviewed, 2017)It has been recently reported that engineering the pores within alloy nanoparticles leads to improvement in the electrochemical activity of nanoparticle catalysts due to the enhanced electrochemical active surface areas. ... -
Tailoring the oxide surface composition of stainless steel for improved OER performance in alkaline water electrolysis
Zamanizadeh, Hamid Reza; Sunde, Svein; Pollet, Bruno; Seland, Frode (Peer reviewed; Journal article, 2022)There is a strong desire to replace bulk nickel electrodes for oxygen evolution reaction (OER) with a cheaper and more active steel material in alkaline water electrolyser (AWE). However, implementing an activation procedure ... -
The influence of graphitization on the thermal conductivity of catalyst layers and temperature gradients in proton exchange membrane fuel cells
Bock, Robert; Karoliussen, Håvard; Pollet, Bruno; Secanell, Marc; Seland, Frode; Stanier, Dave; Burheim, Odne Stokke (Journal article; Peer reviewed, 2018)As the proton exchange membrane fuel cell (PEMFC) has improved its performance and power density, the efficiency has remained unchanged. With around half the reaction enthalpy released as heat, thermal gradients grow. To ... -
The Sono-Hydro-Gen Process (Ultrasound Induced Hydrogen Production): Challenges and Opportunities
Rashwan, Sherif S.; Dincer, Ibrahim; Mohany, Atef; Pollet, Bruno (Journal article; Peer reviewed, 2019)Producing hydrogen using sound waves offers tremendous opportunities, which could lead to a clean, affordable and reliable energy source. Introducing high-frequency sonic waves to liquid water could provide ... -
The Use of Power Ultrasound for the Production of PEMFC and PEMWE Catalysts and Low-Pt Loading and High-Performing Electrodes
Pollet, Bruno (Journal article; Peer reviewed, 2019)This short review paper highlights some of the research works undertaken over the years by Pollet’s research groups in Birmingham, Cape Town, and Trondheim, in the use of power ultrasound for the fabrication of low temperature ... -
The Use of Ultrasound for the Electrochemical Synthesis of Magnesium Ammonium Phosphate Hexahydrate (Struvite)
Foroughi, Faranak; Kékedy-Nagy, László; Islam, Md Hujjatul; Lamb, Jacob Joseph; Greenlee, Lauren F.; Pollet, Bruno (Journal article; Peer reviewed, 2019)With the observed global intensification of the agricultural sector, slurry management has now become a severe problem causing a large amount of pollution due to industrial fertilizers. It is imperative that techniques are ... -
Thermal Gradients and Thermal Conductivity in PEM Fuel Cells, Compared to Li-Ion Batteries and Super Capacitors
Burheim, Odne Stokke; Pollet, Bruno (Journal article; Peer reviewed, 2018)The PEMFC has been developed into a very effective energy converter. That is, the PEMFC offers high power at the same energy efficiency range. This is because the cell potential remains constant while current density ... -
Thermal Gradients with Sintered Solid State Electrolytes in Lithium-Ion Batteries
Bock, Robert; Onsrud, Morten; Karoliussen, Håvard; Pollet, Bruno; Seland, Frode; Burheim, Odne Stokke (Journal article; Peer reviewed, 2020)The electrolyte is one of the three essential constituents of a Lithium-Ion battery (LiB) inaddition to the anode and cathode. During increasingly high power and high current charging anddischarging, the requirement for ... -
Three-dimensional hierarchical walnut kernel shape conducting polymer as water soluble binder for lithium-ion battery
Ma, Xianguo; Zou, Shuliang; Tang, Anjiang; Chen, Lijun; Deng, Zhengua; Pollet, Bruno; Ji, Shan (Journal article; Peer reviewed, 2018)Hierarchical nanostructures containing three-dimensional (3D) spheres are promising materials due to their unique physicochemical characteristics. In this study, a 3D hierarchical walnut kernel shape conducting polymer ... -
Toward high performance of zinc-air battery using hydrophobic carbon foam-based diffusion electrode
Chen, Yimai; Wang, Hui; Ji, Shan; Pollet, Bruno; Wang, Rongfang (Journal article; Peer reviewed, 2018)NaCl is used as template to form porous carbon during the carbonization procedure. It is found that the NaCl amount played an important role in the physical properties of hydrophobic carbon materials. When the current ... -
Tuning the extent of porosity and composition of N-doped carbon materials by NaNO3 and its effect on electrochemical activity
Chen, Y; Wang, H; Ji, Shan; Pollet, Bruno; Wang, Rongfang (Journal article; Peer reviewed, 2018)A facile one-pot method using NaNO3 as etching agent in a molten salt medium is developed to tune the porous structure and composition of N-doped carbon materials derived from biomass at high temperatures. SEM and TEM ... -
Two routes for sonochemical synthesis of platinum nanoparticles with narrow size distribution
Hansen, Henrik Erring; Seland, Frode; Sunde, Svein; Burheim, Odne Stokke; Pollet, Bruno (Journal article; Peer reviewed, 2021)A novel sonochemical approach to synthesize platinum (Pt) nanoparticles has been developed to produce smaller, and more monodisperse particles than traditional chemical reduction methods such as the sodium borohydride ... -
Ultra-high surface area and mesoporous N-doped carbon derived from sheep bones with high electrocatalytic performance toward the oxygen reduction reaction
Li, Shunxi; Xu, Ruoyu; Wang, Hui; Brett, Dan J L; Ji, Shan; Pollet, Bruno; Wang, Rongfang (Journal article; Peer reviewed, 2017)A nitrogen (N)-doped mesoporous carbon material exhibiting ultra-high surface area was successfully synthesized from sheep bones via a facile and low-cost method. The obtained carbon material had an ultra-high specific ... -
Understanding the Effects of Ultrasound (408 kHz) on the Hydrogen Evolution Reaction (HER) and the Oxygen Evolution Reaction (OER) on Raney-Ni in Alkaline Media
Foroughi, Faranak; Immanuel Bernäcker, Christian; Röntzsch, Lars; Pollet, Bruno (Peer reviewed; Journal article, 2022)The hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) occurring at the Raney-Ni mesh electrode in 30 wt.-% aqueous KOH solution were studied in the absence (silent) and presence of ultrasound (408 ... -
The use of non-cavitating coupling fluids for intensifying sonoelectrochemical processes
Islam, Md Hujjatul; Naidji, Bouzid; Hallez, Loic; Et Taouil, Abdeslam; Hihn, Jean-Yves; Burheim, Odne Stokke; Pollet, Bruno (Peer reviewed; Journal article, 2020)For the first time, we have investigated the beneficial effects of non-cavitating coupling fluids and their moderate overpressures in enhancing mass-transfer and acoustic energy transfer in a double cell micro-sonoreactor. ... -
Using Ultrasound to Effectively Homogenise Catalyst Inks: Is this Approach Still Acceptable? Recommendations on the use of ultrasound for mixing catalyst inks
Pollet, Bruno; Kocha, Shyam S. (Peer reviewed; Journal article, 2022)Since the early 2010s, less than a handful of studies have been communicated to the hydrogen and fuel cell communities that special care should be adopted, and a systematic approach should be applied, when homogenising ...