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1.
Comparative study of different polymeric binders in electrochemical CO reduction
Noémi V. Galbicsek, Attila Kormányos, Gergely Ferenc Samu, Mohd M. Ayyub, Tomaž Kotnik, Sebastijan Kovačič, Csaba Janáky, Balázs Endrődi, 2024, izvirni znanstveni članek

Opis: Electrochemical reduction of carbon monoxide offers a possible route to produce valuable chemicals (such as acetate, ethanol or ethylene) from CO2 in two consecutive electrochemical reactions. Such deeply reduced products are formed via the transfer of 4–6 electrons per CO molecule. Assuming similar-sized CO2 and CO electrolyzers, 2–3-times larger current densities are required in the latter case to match the molar fluxes. Such high reaction rates can be ensured by tailoring the structure of the gas diffusion electrodes. Here, the structure of the cathode catalyst layer was systematically varied using different polymeric binders to achieve high reaction rates. Simple linear polymers, bearing the same backbone but different functional groups were compared to highlight the role of different structural motifs. The comparison was also extended to simple linear, partially fluorinated polymers. Interestingly, in some cases similar results were obtained as with the current state-of-the-art binders. Using different surface-wetting characterization techniques, we show that the hydrophobicity of the catalyst layer─provided by the binder─ is a prerequisite for high-rate CO electrolysis. The validity of this notion was demonstrated by performing CO electrolysis experiments at high current density (1 A cm–2) for several hours using PVDF as the catalyst binder.
Ključne besede: electrochemical CO reduction, polymeric binders, carbon monoxide
Objavljeno v DKUM: 04.02.2025; Ogledov: 0; Prenosov: 1
.pdf Celotno besedilo (3,55 MB)

2.
Potentiometric surfactant sensor with a pt-doped acid-activated multi-walled carbon nanotube-based ionophore nanocomposite
Nada Glumac, Milan Momčilović, Iztok Kramberger, Darko Štraus, Nikola Sakač, Elvira Kovač-Andrić, Bojan Đurin, Marija Kraševac Sakač, Kristina Đambić, Marija Jozanović, 2024, izvirni znanstveni članek

Opis: Two new surfactant sensors were developed by synthesizing Pt-doped acid-activated multiwalled carbon nanotubes (Pt@MWCNTs). Two different ionophores using Pt@MWCNTs, a new plasticizer, and (a) cationic surfactant 1,3-dihexadecyl-1H-benzo[d]imidazol-3-ium-DHBI (Pt@MWCNT-DHBI ionophore) and (b) anionic surfactant dodecylbenzenesulfonate-DBS (Pt@MWCNT-DBS ionophore) composites were successfully synthesized and characterized. Both surfactant sensors showed a response to anionic surfactants (dodecylsulfate (SDS) and DBS) and cationic surfactants (cetylpyridinium chloride (CPC) and hexadecyltrimethylammonium bromide (CTAB)). The Pt@MWCNT-DBS sensor showed lower sensitivity than expected with the sub-Nernstian response of ≈23 mV/decade of activity for CPC and CTAB and ≈33 mV/decade of activity for SDS and DBS. The Pt@MWCNTDHBI surfactant sensor had superior response properties, including a Nernstian response to SDS (59.1 mV/decade) and a near-Nernstian response to DBS (57.5 mV/decade), with linear response regions for both anionic surfactants down to ≈2 × 10−6 M. The Pt@MWCNT-DHBI was also useful in critical micellar concentration (CMC) detection. Common anions showed very low interferences with the sensor. The sensor was successfully employed for the potentiometric titration of a technical grade cationic surfactant with good recoveries. The content of cationic surfactants was measured in six samples of complex commercial detergents. The Pt@MWCNT-DHBI surfactant sensor showed good agreement with the ISE surfactant sensor and classical two-phase titration and could be used as an analytical tool in quality control
Ključne besede: potentiometric surfactant sensor, metal-doped MWCNT, surfactants, carbon nanocomposite, sensors
Objavljeno v DKUM: 23.08.2024; Ogledov: 110; Prenosov: 5
.pdf Celotno besedilo (16,29 MB)

3.
Traffic density-related black carbon distribution : impact of wind in a basin town
Borut Jereb, Brigita Gajšek, Gregor Šipek, Špela Kovše, Matevž Obrecht, 2021, izvirni znanstveni članek

Opis: Black carbon is one of the riskiest particle matter pollutants that is harmful to human health. Although it has been increasingly investigated, factors that depend on black carbon distribution and concentration are still insufficiently researched. Variables, such as traffic density, wind speeds, and ground levels can lead to substantial variations of black carbon concentrations and potential exposure, which is even riskier for people living in less-airy sites. Therefore, this paper "fills the gaps" by studying black carbon distribution variations, concentrations, and oscillations, with special emphasis on traffic density and road segments, at multiple locations, in a small city located in a basin, with frequent temperature inversions and infrequent low wind speeds. As wind speed has a significant impact on black carbon concentration trends, it is critical to present how low wind speeds influence black carbon dispersion in a basin city, and how black carbon is dependent on traffic density. Our results revealed that when the wind reached speeds of 1 ms-1 , black carbon concentrations actually increased. In lengthy wind periods, when wind speeds reached 2 or 3 ms-1 , black carbon concentrations decreased during rush hour and in the time of severe winter biomass burning. By observing the results, it could be concluded that black carbon persists longer in higher altitudes than near ground level. Black carbon concentration oscillations were also seen as more pronounced on main roads with higher traffic density. The more the traffic decreases and becomes steady, the more black carbon concentrations oscillate.
Ključne besede: black carbon, black carbon concentration, traffic pollution, air pollution, wind, traffic density, logistics, basin city
Objavljeno v DKUM: 20.08.2024; Ogledov: 44; Prenosov: 8
.pdf Celotno besedilo (2,71 MB)
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4.
Sustainability for planetary health : a seventh domain of quality in primary care
Zalika Klemenc-Ketiš, Andree Rochfort, 2022, drugi znanstveni članki

Opis: Climate change is one of the biggest threats to public health. Sustainability is characterized by using resources wisely in a way that protects finite resources and the environment, and takes into account the needs of our planets’ inhabitants in the future. Sustainability in health care should be considered as a seventh domain of quality, as it can lead to improvement of patient outcomes, and more capacity for health care workers to engage in quality improvement and thereby improve the quality of care. The carbon footprint of primary care is high, mainly due to prescribing medication, but also due to the transport of patients to hospitals and primary care services for interventions requested by family medicine. Other causes are the transport of staff and supplies, consumables and staff involved in laboratory analysis and radiation, medical and non-medical equipment, clinical and non-clinical waste, heating and cooling systems and other activities. Small adjustments in these areas could significantly decrease the carbon footprint of primary care practices. The suggested steps for primary care to achieve a more sustainable practice are fostering research, raising awareness, reducing the burden on primary care, engaging in quality improvement, and leadership and advocacy. Each individual primary care practice has the potential to be a leader and role model for sustainable health care. With the implementation of interventions to reduce carbon footprints, primary care could set an example within the health sector and for patients. This could significantly raise the awareness of the public about the need to take actions for a greener health system.
Ključne besede: primary care, sustainability, carbon footprint, quality
Objavljeno v DKUM: 24.06.2024; Ogledov: 173; Prenosov: 7
.pdf Celotno besedilo (180,76 KB)
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5.
Unmasking the structure of a chiral cubic thermotropic liquid crystal phase by a combination of soft and tender resonant X-ray scattering
Timon Grabovac, Ewa Górecka, Chenhui Zhu, Damian Pociecha, Nataša Vaupotič, 2022, izvirni znanstveni članek

Opis: A resonant X-ray scattering response for two structural models of a chiral cubic phase with a giant unit cell, one composed of a continuous grid and micelles and the other with three continuous grids, is studied theoretically and compared to experimental measurements. For both structural models resonant enhancement of all the symmetry-allowed diffraction peaks is predicted, as well as the existance of several symmetry forbidden peaks (pure resonant peaks). Experimental measurements were performed at the carbon and sulphur absorption edge. Only one pure resonant peak was observed, which is predicted by both models. Two low-angle symmetry allowed peaks, not observed in non-resonant scattering, were resonantly enhanced and their intensity angular dependence can distinguish between the two structural models.
Ključne besede: resonant X-ray scattering, chiral cubic thermotropic liquid crystal phase, structural models, carbon absorption edge, sulphur absorption edge
Objavljeno v DKUM: 13.06.2024; Ogledov: 140; Prenosov: 14
.pdf Celotno besedilo (2,00 MB)
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6.
6th International Conference En-Re Energy & Responsibility : Book of Extended Abstracts
2024

Opis: In the context of escalating climate challenges, the EnRe conference is dedicated to exploring pathways to climate neutrality and the sustainable green transition. The conference is focused on the development and implementation of innovations supporting the transformation of energy systems, industrial systems, and living systems, all with the goal of creating a sustainable future with net-zero emissions. The conference brings together experts, researchers, policymakers, and business leaders to share their experiences, research, and visions. The aim of the conference is to foster collaboration and exchange of ideas, and to collectively develop comprehensive approaches and strategies for achieving climate neutrality. This conference is not just a knowledge exchange, but also a platform for encouraging concrete actions that will ensure a greenerand more sustainable future for our next generations to come.
Ključne besede: alternative energy systems, dynamic tariffing, electrical machines and drives, energy conversions, financing energy projects, nuclear energy, conventional energy systems, climate changes - climate pan, mathematical methods in engineering, micro and nano energy, low-carbon technologies and strategies, renewable energy technologies heating and cooling systems, smart buildings, cities and networks, policies and strategies for renewable energy sources, energy efficiency and the climate
Objavljeno v DKUM: 17.05.2024; Ogledov: 332; Prenosov: 40
.pdf Celotno besedilo (10,40 MB)
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7.
Carbon-free heat production for high-temperature heating systems
Sven Gruber, Klemen Rola, Danijela Urbancl, Darko Goričanec, 2023, izvirni znanstveni članek

Opis: The article presents a new carbon-free heat production technology for district heating, which consists of a combined heat and power generation fuel cell (FC CHP) with CO2 capture and a two-stage cascade high-temperature heat pump (TCHHP). The FC generates heat and electricity, the latter being used to drive the compressors of the TCHHP. During the winter period, the water temperature achieved can occasionally be too low, so it would be heated up with hydrogen gas boilers. The hydrogen would be produced by reforming natural gas, synthetic methane, or biogas. The results are presented with natural gas utilization—the ratio between the obtained heat flow transferred directly to the water for district heating and the input heat flow of natural gas. In the case of a return water temperature of 60 °C and district heating temperature of 85 °C, the TCHHP, whose heat source is groundwater, achieves plant efficiency of 270.04% in relation to the higher heating value (HHV) and 241.74% in relation to the lower heating value (LHV) of natural gas. A case with a TCHHP whose heat source is low-temperature geothermal water achieves a plant efficiency of 361.36% in relation to the HHV and 323.49% in relation to the LHV.
Ključne besede: carbon-free, decarbonization of district heating systems, fuell cell, high-temperature district heating, high-temperature heat pump
Objavljeno v DKUM: 10.05.2024; Ogledov: 233; Prenosov: 17
.pdf Celotno besedilo (3,32 MB)
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