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  • 1. Gimpel, Thomas
    et al.
    Börner, Mia
    Stockholm University, Faculty of Science, Department of Physics.
    Hoffmann, Viktor
    Lederle-Flamm, Madita
    Hedin, Niklas
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Schade, Wolfgang
    Turek, Thomas
    Nilsson, Anders
    Stockholm University, Faculty of Science, Department of Physics.
    Diaz-Morales, Oscar
    Stockholm University, Faculty of Science, Department of Physics.
    Electrochemical Carbon Dioxide Reduction on Femtosecond Laser-Processed Copper Electrodes: Effect on the Liquid Products by Structuring and Doping2021In: ACS Applied Energy Materials, E-ISSN 2574-0962, Vol. 4, no 6, p. 5927-5934Article in journal (Refereed)
    Abstract [en]

    A femtosecond laser process is presented increasing the surface area of copper electrocatalysts for an electrochemical CO2 reduction reaction (CO2RR). The laser treatment allows us to tune the surface morphology and the chemical composition of the copper electrocatalysts. This tunability is used to correlate the role of the surface area and catalyst dopants with the selectivity of the CO2RR. The liquid products of the CO2RR are monitored through ex situ nuclear magnetic resonance spectroscopy. The products’ distribution shows that the electrode surface area plays a key role in the electrochemical conversion of CO2 into multicarbon liquid products. We show that sulfur dopants boost the production of formate. Remarkably, by co-doping sulfur and fluoride, we show that the chalcogenide dopant counteracts the known boosting effect of fluoride to convert CO2 into multicarbon products. Oxygen doping in the range of 2–19 atom % does not significantly affect the distribution of liquid products from CO2 electroreduction. In a broad perspective, this work highlights the potential of the femtosecond laser process to fine-tune surfaces to produce photo- and electrocatalyst materials.

  • 2. Kim, Hyeyun
    et al.
    Guccini, Valentina
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). KTH Royal Institute of Technology, Sweden.
    Lu, Huiran
    Salazar-Alvarez, Germán
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). KTH Royal Institute of Technology, Sweden.
    Lindbergh, Göran
    Cornell, Ann
    Lithium Ion Battery Separators Based On Carboxylated Cellulose Nanofibers From Wood2019In: ACS Applied Energy Materials, E-ISSN 2574-0962, Vol. 2, no 2, p. 1241-1250Article in journal (Refereed)
    Abstract [en]

    Carboxylated cellulose nanofibers, prepared by TEMPO-mediated oxidation (TOCN), were processed into asymmetric mesoporous membranes using a facile paper-making approach and investigated as lithium ion battery separators. Membranes made of TOCN with sodium carboxylate groups (TOCN-COO-Na+) showed capacity fading after a few cycles of charging and discharging. On the other hand, its protonated counterpart (TOCN-COOH) showed highly improved electrochemical and cycling stability, displaying 94.5% of discharge capacity maintained after 100 cycles at 1 C rate of charging and discharging. The asymmetric surface porosity of the membranes must be considered when assembling a battery cell as it influences the rate capabilities of the battery. The wood-based TOCN-membranes have a good potential as an ecofriendly alternative to conventional fossil fuel-derived separators without adverse side effects.

  • 3.
    Lee, Kian Keat
    et al.
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Church, Tamara L.
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Hedin, Niklas
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    RNA as a Precursor to N-Doped Activated Carbon2018In: ACS Applied Energy Materials, E-ISSN 2574-0962, Vol. 1, no 8, p. 3815-3825Article in journal (Refereed)
    Abstract [en]

    Activated carbons (ACs) have applications in gas separation and power storage, and N-doped ACs in particular can be promising supercapacitors. In this context, we studied ACs produced from yeast-derived ribonucleic acid (RNA), which contains aza-aromatic bases and phosphate-linked ribose units, and is surprisingly inexpensive. The RNA was hydrothermally carbonized to produce hydrochars that were subsequently activated with CO2, KOH, or KHCO3 to give ACs. The ACs adsorbed up to similar to 7 mmol/g at 0 degrees C and 1 bar and had capacitances as high as similar to 300 F/g in a three-electrode cell and a 6 M KOH(aq) electrolyte. The material that displayed the best capacitance was tested in a two-electrode cell, which displayed a specific capacitance of 181 F/g even at a current density of 10 A/g. The ACs with the highest uptake of CO2 and the highest capacitance were those activated with KOH and KHCO3; however, CO2 activation is arguably less expensive and more suitable for industrialization.

  • 4. Namanga, Jude E.
    et al.
    Pei, Hanwen
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Bousrez, Guillaume
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Smetana, Volodymyr
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Gerlitzki, Niels
    Mudring, Anja-Verena
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). Ruhr-Universität Bochum, Germany.
    Fluorinated Cationic Iridium(III) Complex Yielding an Exceptional, Efficient, and Long-Lived Red-Light-Emitting Electrochemical Cell2020In: ACS Applied Energy Materials, E-ISSN 2574-0962, Vol. 3, no 9, p. 9271-9277Article in journal (Refereed)
    Abstract [en]

    A carefully designed red-light-emitting iridium (III) cationic complex yields light-emitting electrochemical cells (LECs) with exceptional efficiency and stability [Ir(4Fppy)(2)(biq)][PF6] (4Fppy = 2-(4-fluorophenyl)pyridinato, biq = 2,2'-biquinoline), whose structure was authenticated by single-crystal X-ray diffraction, emits in the red region of light with photoluminescence (upon 360 nm excitation) and electroluminescence maxima at 629 nm. Astonishingly, it is based on a fluorinated ligand, a design concept more commonly used for green emitter materials. Pairing it with a ligand that has comparatively low-lying frontier orbitals allows for a red shift of the band gap. The uncommon electronic structure of the complex allows overcoming the common problem of strong metal-ligand antibonding interactions in the excited state, rendering it extremely stable under operation. The complex displays a high photoluminescence quantum yield of 27.1% giving rise to an extremely efficient LEC with an initial maximum luminance of 326 cd m(-2), current efficiency of 3.26 cd A(-1), and power efficiency of 2.27 Im W-1, surpassing the current state of the art. Remarkably, the efficient red LEC has a lifetime of 167 h when driven under a block-wave pulsed current at a frequency of 1000 Hz, an average current density of 100 A m(-2), and a duty cycle of 50%. Increasing the duty cycle to 75% led to a decrease in the device average voltage, increasing the power efficiency to an exceptional value of 2.97 Im W-1 without compromising the device stability.

  • 5. Wang, Wei
    et al.
    Han, Juan
    Sun, Yan
    Zhang, Miao
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Zhou, Shiqi
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Zhao, Kai
    Yuan, Jiayin
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Metal-Free SeBN Ternary-Doped Porous Carbon as Efficient Electrocatalysts for CO2 Reduction Reaction2022In: ACS Applied Energy Materials, E-ISSN 2574-0962, Vol. 5, no 9, p. 10518-10525Article in journal (Refereed)
    Abstract [en]

    Cost-effective heteroatom-doped porous carbons are considered promising electrocatalysts for CO2 reduction reaction (CO2RR). Traditionally porous carbons with N doping or N/X codoping (X denotes the second type of heteroatom) have been widely studied, leaving ternary doping a much less studied yet exciting topic to be explored. Herein, a series of electrocatalysts based on metal-free Se, B, and N ternary-doped porous carbons (termed “SeBN-Cs”) were synthesized and tested as metal-free electrocatalysts in CO2RR. Our study indicates that the major product of CO2RR on the SeBN-C electrocatalysts was CO with a small fraction (<5%) of H2 as the byproduct. The optimal electrocatalyst sample SeBN-C-1100 prepared at 1100 °C exhibits a high CO selectivity with a Faradaic efficiency of CO reaching 95.2%. After 10 h of continuous electrolysis operation, the Faradaic efficiency and the current density are maintained high at 97.6 and 84.7% of the initial values, respectively, indicative of a long-term operational stability. This study provides an excellent reference to deepen our understanding of the properties and functions of multi-heteroatom-doped porous carbon electrocatalysts in CO2RR. 

  • 6. White, Jai
    et al.
    Terekhina, Irina
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Campos dos Santos, Egon
    Stockholm University, Faculty of Science, Department of Physics.
    Martín-Yerga, Daniel
    Pettersson, Lars Gunnar Moody
    Stockholm University, Faculty of Science, Department of Physics.
    Johnsson, Mats
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Cornell, Ann
    Synergistic Bimetallic PdNi Nanoparticles: Enhancing Glycerol Electrooxidation While Preserving C3 Product Selectivity2024In: ACS Applied Energy Materials, E-ISSN 2574-0962, Vol. 7, no 5, p. 1802-1813Article in journal (Refereed)
    Abstract [en]

    Electrochemical conversion of glycerol offers a promising route to synthesize value-added glycerol oxidation products (GOPs) from an abundant biomass-based resource. While noble metals provide a low overpotential for the glycerol electrooxidation reaction (GEOR) and high selectivity toward three-carbon (C3) GOPs, their efficiency and cost can be improved by incorporating non-noble metals. Here, we introduce an effective strategy to enhance the performance of Pd nanoparticles for the GEOR by alloying them with Ni. The resulting PdNi nanoparticles show a significant increase in both specific activity (by almost 60%) and mass activity (by almost 35%) during the GEOR at 40 °C. Additionally, they exhibit higher resistance to deactivation compared to pure Pd. Analysis of the GOPs reveals that the addition of Ni into Pd does not compromise the selectivity, with glycerate remaining at around 60% of the product fraction and the other major product being lactate at around 30%. Density functional theory calculations confirm the reaction pathways and the basis for the higher activity of PdNi. This study demonstrates a significant increase in the GEOR catalytic performance while maintaining the selectivity for C3 GOPs, using a more cost-effective nanocatalyst.

  • 7. Wu, Hua
    et al.
    Zhu, Huimin
    Erbing, Axel
    Stockholm University, Faculty of Science, Department of Physics.
    Johansson, Malin B.
    Mukherjee, Soham
    Man, Gabriel J.
    Rensmo, Håkan
    Odelius, Michael
    Stockholm University, Faculty of Science, Department of Physics.
    Johansson, Erik M. J.
    Bandgap Tuning of Silver Bismuth Iodide via Controllable Bromide Substitution for Improved Photovoltaic Performance2019In: ACS Applied Energy Materials, E-ISSN 2574-0962, Vol. 2, no 8, p. 5356-5362Article in journal (Refereed)
    Abstract [en]

    In this work, silver-bismuth-halide thin films, exhibiting low toxicity and good stability, were explored systemically by gradually substituting iodide, I, with bromide, Br, in the AgBi2I7 system. It was found that the optical bandgap can be tuned by varying the I/Br ratio. Moreover, the film quality was improved when introducing a small amount of Br. The solar cell was demonstrated to be more stable at ambient conditions and most efficient when incorporating 10% Br, as a result of decreased recombination originating from the increased grain size. Thus, replacing a small amount of I with Br was beneficial for photovoltaic performance.

  • 8.
    Zhang, Xingyan
    et al.
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Liu, You
    Noréus, Dag
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Phosphide-Enhanced Hierarchical NiMoO4 Composite in Binder-Free Ni-Electrodes for High-Capacity Aqueous Rechargeable NiZn Batteries2024In: ACS Applied Energy Materials, E-ISSN 2574-0962, Vol. 7, no 2, p. 517-527Article in journal (Refereed)
    Abstract [en]

    A growth strategy is described where a multidimensional P(Ni, Fe) nanoarray electrode is fabricated by phosphiding NiMoO4 nanoflakes modified with a Ni-based Prussian blue analogue induced by in situ self-sacrificial formation. The generated electrode exhibits a specific capacity of 501.8 mAh g–1 at 1 A g–1, owing to the unique overlapping cross-stacked network structure with increased surface- and interface-active sites and enhanced conductivity. This is about 2 times larger than those of the NiMoO4 (200.2 mAh g–1) and NiMoO4/Ni-Prussian blue analogue (NiMoO4/Ni-PBA) (217.3 mAh g–1) electrodes. The battery cell assembled with the obtained P(Ni, Fe) nanoarray electrode and a Zn plate as the counter electrode shows a high energy density of 962.6 Wh kg–1 at a power density of 870 W kg–1. This demonstrates the potential of NiMoO4-based materials for NiZn battery applications and gives insight into the design of electrode materials by controlling the surface/interface in next-generation high-performing NiZn batteries.

  • 9. Zhu, Huimin
    et al.
    Erbing, Axel
    Stockholm University, Faculty of Science, Department of Physics.
    Wu, Hua
    Man, Gabriel J.
    Mukherjee, Soham
    Kamal, Chinnathambi
    Stockholm University, Faculty of Science, Department of Physics. Raja Ramanna Centre for Advanced Technology, India.
    Johansson, Malin B.
    Rensmo, Håkan
    Odelius, Michael
    Stockholm University, Faculty of Science, Department of Physics.
    Johansson, Erik M. J.
    Tuning the Bandgap in Silver Bismuth Iodide Materials by Partly Substituting Bismuth with Antimony for Improved Solar Cell Performance2020In: ACS Applied Energy Materials, E-ISSN 2574-0962, Vol. 3, no 8, p. 7372-7382Article in journal (Refereed)
    Abstract [en]

    Silver bismuth iodide (Ag–Bi–I) light absorbers are interesting candidates as lead-free and low-toxic metal-halide materials for solar cell applications. In this work, the partial exchange of bismuth, Bi, with antimony, Sb, is investigated in samples prepared from a solution targeting stoichiometry AgBi2I7. Samples with a gradually increased exchange of Bi by Sb are prepared and light absorption measurements show that the absorption edge is gradually blue-shifted with increasing the amount of Sb. This trend in the shift in combination with the X-ray diffraction and X-ray photoelectron spectroscopy measurements, suggest that new materials with a mixture of Sb and Bi are formed. The density functional theory based electronic structure calculations reproduce the trend observed in the experiments when including spin–orbit coupling, which indicates the importance of relativistic effects in these materials. X-ray photoelectron spectroscopy is used to characterize the materials, and confirms the exchange of Bi to Sb in the samples. When Sb is included in the material, the grain size changes between 50 and 200 nm and the solar cell performance also changes. An optimal power conversion efficiency with excellent reproducibility and stability is obtained for a solar cell with the ratio of Sb/Bi equal to 3.

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