Journal: ACS Energy Letters

Abbreviation

ACS Energy Lett.

Publisher

American Chemical Society

Journal Volumes

ISSN

2380-8195

Description

Filters

2016 - 2019102020 - 202519
Reset filters

Search Results

Publications 1 - 10 of 29
  • On Achievable Gravimetric and Volumetric Energy Densities of Al Dual-Ion Batteries
    Item type: Journal Article
    Kravchyk, Kostiantyn V.; Kovalenko, Maksym V. (2023)
    ACS Energy Letters
  • Heterogeneous catalysis for the valorization of CO2: Role of bifunctional processes in the production of chemicals
    Item type: Journal Article
    Dokania, Abhay; Ramirez Galilea, Adrian; Bavykina, Anastasiya; et al. (2018)
    ACS Energy Letters
    Carbon dioxide is an abundant carbon feedstock, and there exists a sustained interest in methods for its utilization. At the moment, several routes that rely on the use of renewable energy for the valorization of CO2 are being considered, with a strong emphasis on fully electrocatalytic routes. In this Perspective, we highlight the role that heterogeneous catalysis may play in hybrid processes in which H2 is obtained via electrolysis and CO2 is valorized in a second, dark step. Targeting high selectivity to value-added products (olefins and aromatics), we cover CO2-to-chemicals routes that involve cascade multifunctional processes. In doing so, we highlight the main advantages of this approach along with the most important challenges and remaining questions.
  • Water or Anion? Uncovering the Zn2+ Solvation Environment in Mixed Zn(TFSI)2 and LiTFSI Water-in-Salt Electrolytes
    Item type: Journal Article
    Zhang, Yong; Wan, Gang; Lewis, Nicholas H.C.; et al. (2021)
    ACS Energy Letters
    Applications of aqueous zinc batteries for grid-scale energy storage are limited by their poor reversibility and the competing water splitting reaction. The recent invention of a water-in-salt (WIS) electrolyte concept provides a new route enabling a stable and highly reversible aqueous zinc battery chemistry. In the present work, a mixed zinc bis(trifluoromethane sulfonyl)imide (Zn(TFSI)2) and LiTFSI WIS electrolyte was studied using X-ray total scattering, X-ray absorption, and Fourier transform infrared spectroscopy in conjunction with classical molecular dynamics simulations. It was found that, in the highly concentrated WIS electrolyte consisting of 1 m Zn(TFSI)2 and 20 m LiTFSI, Zn2+ cations are mainly solvated by six waters in their first solvation shell, while the TFSI- anions are completely excluded. This ion solvation picture is fundamentally different from the previous understandings. The results suggest that additional studies are needed to fully understand the unusual stability and reversibility of zinc-WIS electrolyte-based batteries.
  • A Universal, Highly Stable Dopant System for Organic Semiconductors Based on Lewis-Paired Dopant Complexes
    Item type: Journal Article
    Zapata-Arteaga, Osnat; Perevedentsev, Aleksandr; Prete, Michela; et al. (2024)
    ACS Energy Letters
    Chemical doping of organic semiconductors is an essential enabler for applications in electronic and energy-conversion devices such as thermoelectrics. Here, Lewis-paired complexes are advanced as high-performance dopants that address all the principal drawbacks of conventional dopants in terms of limited electrical conductivity, thermal stability, and generality. The study focuses on the Lewis acid B(C6F5)(3) (BCF) and 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F(4)TCNQ) bearing Lewis-basic -CN groups. Due to its high electron affinity, BCF:F(4)TCNQ dopes an exceptionally wide range of organic semiconductors, over 20 of which are investigated. Complex activation and microstructure control lead to conductivities for poly(3-hexylthiophene) (P3HT) exceeding 300 and 900 S cm(-1) for isotropic and chain-oriented films, respectively, resulting in a 10 to 50 times larger thermoelectric power factor compared to those obtained with neat dopants. Moreover, BCF:F(4)TCNQ-doped P3HT exhibits a 3-fold higher thermal dedoping activation energy compared to that obtained with neat dopants and at least a factor of 10 better operational stability.
  • Lead Halide Perovskite Nanocrystals in the Research Spotlight: Stability and Defect Tolerance
    Item type: Journal Article
    Huang, He; Bodnarchuk, Maryna I.; Kershaw, Stephen V.; et al. (2017)
    ACS Energy Letters
  • Negative Thermal Quenching in FASnI(3) Perovskite Single Crystals and Thin Films
    Item type: Journal Article
    Kahmann, Simon; Nazarenko, Olga; Shao, Shuyan; et al. (2020)
    ACS Energy Letters
    Formamidinium tin triiodide (FASnI(3)) is a strong contender for sustainable harvesting of solar energy and further optoelectronic applications. So far, only a few studies have considered its fundamental structure-property relationships, given the challenge of ensuring a high material quality. In a concerted effort, we here study high-quality FASnI(3) single crystals through a combination of X-ray crystallography, density-functional-theory-based electronic structure calculations, and photoluminescence spectroscopy from room temperature down to 4 K. The luminescence exhibits irregular trends upon cooling with a generally strong intensity increase, but a range of negative thermal quenching, leading to an intensity maximum around 185 K which is absent in low-quality samples. Differences in the photoluminescence peak position and density-functional-theory-calculated band-gap energies highlight the importance of dynamic processes to the observable properties of FASnI(3). The presented data offer deeper insight into the temperature-dependent characteristics of this halide perovskite and present opportunities for future exploration of its optoelectronic properties.
  • Gradient-Doped Colloidal Quantum Dot Solids Enable Thermophotovoltaic Harvesting of Waste Heat
    Item type: Journal Article
    Kiani, Amirreza; Movahed, Hamidreza F.; Hoogland, Sjoerd; et al. (2016)
    ACS Energy Letters
  • What About Manganese? Toward Rocking Chair Aqueous Mn-Ion Batteries
    Item type: Journal Article
    Nimkar, Amey; Chae, Munseok S.; Wee, Shianlin; et al. (2022)
    ACS Energy Letters
    The emerging interest in aqueous rechargeable batteries has led to significant progress in the development of next-generation electrolytes and electrode materials enabling reversible and stable insertion of various multivalent ions into the electrode's bulk. Yet, despite its abundance, high salt solubility, and small ionic radius, the use of manganese ions for energy storage purposes has not received sufficient attention. Herein, we present the use of Mo6S8 (Chevrel phase) as an anode for Mn2+ insertion. By careful optimization of the electrolyte solution, high-capacity values exceeding 90 mAh/g and long-term stability (more than 1500 cycles) have been obtained. Based on in situ XRD analysis, the charging mechanism and the associated structural changes occurring during Mn2+ insertion have been carefully studied. Finally, we demonstrate for the first time a rocking chair aqueous Mn-ion battery comprising a Chevrel anode and NiHCF cathode.
  • Rationalizing and Controlling the Surface Structure and Electronic Passivation of Cesium Lead Halide Nanocrystals
    Item type: Journal Article
    Bodnarchuk, Maryna I.; Boehme, Simon C.; ten Brinck, Stephanie; et al. (2019)
    ACS Energy Letters
  • Exclusive Solution Discharge in Li–O2 Batteries?
    Item type: Journal Article
    Prehal, Christian; Mondal, Soumyadip; Lovicar, Ludek; et al. (2022)
    ACS Energy Letters
    Capacity, rate performance, and cycle life of aprotic Li-O2 batteries critically depend on reversible electrodeposition of Li2O2. Current understanding states surface-adsorbed versus solvated LiO2 controls Li2O2 growth as surface film or as large particles. Herein, we show that Li2O2 forms across a wide range of electrolytes, carbons, and current densities as particles via solution-mediated LiO2 disproportionation, bringing into question the prevalence of any surface growth under practical conditions. We describe a unified O2 reduction mechanism, which can explain all found capacity relations and Li2O2 morphologies with exclusive solution discharge. Determining particle morphology and achievable capacities are species mobilities, true areal rate, and the degree of LiO2 association in solution. Capacity is conclusively limited by mass transport through the tortuous Li2O2 rather than electron transport through a passivating Li2O2 film. Provided that species mobilities and surface growth are high, high capacities are also achieved with weakly solvating electrolytes, which were previously considered prototypical for low capacity via surface growth.
Publications 1 - 10 of 29