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Article
Chemistry, Multidisciplinary
Degenhart Hochfilzer et al.
Summary: The relationship between the surface atomic structure and activity of Cu-based electrocatalysts for CO2 and CO reduction is difficult to establish due to possible surface restructuring under working conditions. In order to overcome this limitation, the development of surface-sensitive, electrochemical probes is highly desired. This study investigates the underpotential deposition of lead on Cu single crystals in alkaline media and demonstrates the formation of an irreversible surface alloy between Cu and Pb.
Review
Energy & Fuels
David Wakerley et al.
Summary: Chemicals and fuels can be generated from CO2 via electrolysers that employ gas diffusion electrodes. This review discusses the key advances and remaining shortfalls of GDE-based CO2 electrolysers, as well as provides an overview of partial current densities, efficiencies, and stabilities achieved.
Article
Energy & Fuels
Ya-Rong Zheng et al.
Summary: This study presents a low-iridium mass-selected iridium-tantalum oxide catalyst with high intrinsic activity for acid environments, aiming to improve the efficiency of hydrogen production in water electrolysers. By carefully evaluating oxygen production, the researchers demonstrate that the catalyst exhibits higher activity compared to commercial IrO2.
Article
Electrochemistry
Maximilian Moeckl et al.
Summary: The durability of a novel iridium catalyst with a low iridium loading density was investigated in a PEM water electrolysis short stack. The performance of the novel catalyst was compared to a conventional iridium catalyst. The results showed that the novel catalyst had lower degradation in performance at low current densities, making it suitable for industrial applications.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Electrochemistry
Roberta K. F. Della Bella et al.
Summary: The loss of electrochemically active surface area (ECSA) in the cathode of proton exchange membrane fuel cells (PEMFCs) remains a major durability issue. In this study, the degradation of low-loaded cathodes was investigated, and a linear relationship was found between ECSAltf and the number of cycles or time, with higher slopes for harsher stress tests.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Degenhart Hochfilzer et al.
Summary: Pulsed electrolysis has shown promise for improving CO2 reduction activity and selectivity. In this study, highly active but short-lived methane and hydrogen transients were observed during pulsed electrochemical CO reduction in a phosphate buffer. It was found that these transients originated from the initial presence and local depletion of phosphate ions, which acted as proton donors. This finding highlights the importance of the proton donor nature and its local concentration for proton-coupled electron transfer-limited reactions.
Editorial Material
Chemistry, Physical
Angelika A. Samu et al.
Summary: This study demonstrates the dynamic operation of CO2 electrolyzer cells, mimicking the power output of a solar photovoltaic power plant. The zero-gap design allows efficient intermittent operation for a week, without significant performance loss.
ACS ENERGY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Melissa E. Kreider et al.
Summary: This study investigates the dissolution characteristics of Mn(-Cr)-Sb-O electrocatalysts using an online electrochemical flow cell coupled with an inductively coupled plasma-mass spectrometer (ICP-MS). The results show that the antimonate framework stabilizes Mn and Cr at different potentials. The dissolution of Mn and Cr is primarily influenced by the ORR reaction rate. Moreover, by understanding the interplay between oxygen reduction and dissolution, the study identifies testing procedures to optimize catalyst performance.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Raina A. Krivina et al.
Summary: Anion-exchange-membrane water electrolyzers operate without soluble electrolyte using earth-abundant catalysts to lower the cost of green H-2. However, the lack of competitive performance and durability due to a poor understanding of catalyst-specific degradation processes remains a critical issue. This study investigates non-PGM anode catalysts in AEMWEs, revealing that catalyst electrical conductivity and restructuring during operation are key factors in achieving high performance and stability. The results also highlight the dynamic catalytic processes leading to AEMWE device failure, demonstrate a viable non-PGM catalyst for operation, and provide design rules for improving performance and durability.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Jiayu Peng et al.
Summary: Earth-abundant manganese-based oxides have the potential to replace costly noble-metal-based catalysts in fuel cells and electrolyzers. However, the dissolution of Mn-based oxides in acid has hindered their practical utilization. In this work, dissolution kinetic studies and first-principles calculations were used to quantify the dissolution of Mn-based oxides in acid and identify material descriptors that govern their acid stability. It was found that lowering the Mn oxidation states in the oxides led to greater driving forces for critical reaction steps, resulting in poorer stability and faster dissolution kinetics. Computational screening further validated these correlations for the stability of oxides in acid. The findings provide new guiding principles for designing and optimizing oxides with enhanced durability in acid for clean energy applications.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Moritz L. Weber et al.
Summary: This study reveals the activation and deactivation mechanism of perovskite oxide catalysts under steady-state oxygen evolution reaction (OER) conditions. The findings demonstrate the importance of surface structural changes and phase transformations in governing the catalytic activity of perovskite catalysts.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Eva Kolle-Goergen et al.
Summary: The main challenges in catalysis are high activity, selectivity, cost efficiency, and stability. Stability, in particular, is of utmost importance but lacks realistic measurements and understanding of degradation pathways for new catalysts.
CHEMISTRY OF MATERIALS
(2022)
Review
Physics, Condensed Matter
See Wee Chee et al.
Summary: This article reviews the latest technology of in situ and operando electron microscopy (EM) studies of heterogeneous catalysts in gas and liquid environments during reactions. The importance of heterogeneous catalysts in efficient production of chemicals/fuels on an industrial scale and their role in ensuring a sustainable future for society is highlighted. The challenges and future directions in experimentally applying these techniques, as well as the critical discussion of spatially-resolved operando measurements and available experimental setups, are addressed.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Chemistry, Multidisciplinary
Florian D. Speck et al.
Summary: Current research focuses on finding cheaper transition metals to replace expensive noble metals as electrocatalyst materials, utilizing activity descriptors for identifying highly active electrocatalysts and establishing periodic correlations to support the design of more stable electrocatalysts.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Multidisciplinary Sciences
Julius Knoeppel et al.
Summary: Recent research shows a severe difference in the dissolution of oxygen evolution reaction catalysts in aqueous model systems and membrane electrode assemblies. The main contributors to this dissolution discrepancy are identified as the overestimated acidity in the anode catalyst layer and the stabilization of catalysts over time in real devices.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Christoph Griesser et al.
Summary: In aqueous electrolytes, surface oxide formation on hexagonal Mo2C completely suppresses CO2 activation, while in nonaqueous electrolytes, Mo2C shows CO2RR activity when protected from ambient air.
Article
Chemistry, Physical
Degenhart Hochfilzer et al.
Summary: This study demonstrates the importance of introducing electrodes under potential control in specific reactors through the use of an auxiliary electrochemical cell for investigating the intrinsic activity of nanostructured copper catalysts.
ACS ENERGY LETTERS
(2021)
Article
Chemistry, Physical
Zhenbin Wang et al.
Summary: In this study, the stability of nonprecious hydrogen evolution reaction (HER) catalysts under working conditions was quantitatively analyzed using calculated Pourbaix diagrams. It was found that the significant thermodynamic driving force towards decomposition at the electrode/electrolyte interface potential is responsible for the dissolution of these catalysts at open-circuit potential (OCP). The stability order of HER catalysts in acidic solution was determined through measurement of dissolution rates.
ACS ENERGY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Anthony Kipkorir et al.
Summary: The synthesis of CsPbBr3-CdS heterostructures has improved stability and photocatalytic performance by providing solvent stability with CdS deposition. The heterostructure exhibits longer emission lifetime and surface defect passivation compared to pristine CsPbBr3. Excited state interactions and interfacial electron transfer were elucidated using ethyl viologen as a probe molecule in toluene/ethanol mixed solvent, revealing a high electron transfer rate constant and quantum efficiency under visible light excitation. Insights into the effective utilization of perovskite nanocrystals in quasi-type II heterostructures pave the way for their application in photocatalytic reduction and oxidation processes.
Article
Chemistry, Physical
Paula Sebastin-Pascual et al.
ACS ENERGY LETTERS
(2020)
Article
Chemistry, Multidisciplinary
Seryio Saris et al.
HELVETICA CHIMICA ACTA
(2020)
Article
Chemistry, Physical
Aarti Tiwari et al.
ACS ENERGY LETTERS
(2020)
Article
Chemistry, Physical
Soren B. Scott et al.
CATALYSIS SCIENCE & TECHNOLOGY
(2020)
Editorial Material
Chemistry, Physical
Soren B. Scott et al.
ACS ENERGY LETTERS
(2019)
Editorial Material
Energy & Fuels
Jakob Kibsgaard et al.
Article
Chemistry, Multidisciplinary
Olga Kasian et al.
Article
Electrochemistry
Maximilian Schalenbach et al.
ELECTROCHIMICA ACTA
(2018)
Article
Chemistry, Physical
Sungeun Yang et al.
Article
Chemistry, Physical
Simon Geiger et al.
Review
Multidisciplinary Sciences
Zhi Wei Seh et al.
Article
Chemistry, Multidisciplinary
Marc Ledendecker et al.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2017)
Article
Chemistry, Multidisciplinary
Brian Seger et al.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2013)
Article
Chemistry, Physical
Jakob Kibsgaard et al.
Letter
Chemistry, Physical
J Solla-Gullón et al.
JOURNAL OF PHYSICAL CHEMISTRY B
(2004)
Review
Chemistry, Multidisciplinary
E Herrero et al.
