4.6 Review

Defining the onset potential

Related references

Note: Only part of the references are listed.
Article Chemistry, Physical

Electrochemical Screening of Contact Layers for Metal Halide Perovskites

Moses Kodur et al.

Summary: Optimizing selective contact layers in photovoltaics is essential for high-performing stable devices. Using vacuum thermally evaporated tin oxide as a case study demonstrates the effectiveness of simple electrochemical tests in screening device-relevant contact layer properties, aiding in process development and quality control. Fast, reliable, scalable, and actionable probes of electronic properties become increasingly important as halide perovskite photovoltaics approach their theoretical limits and scale to large-area devices.

ACS ENERGY LETTERS (2022)

Article Multidisciplinary Sciences

Active and conductive layer stacked superlattices for highly selective CO2 electroreduction

Junyuan Duan et al.

Summary: This study proposes a superlattice model with alternating metal oxides and selenide sublayers, in which electrons are rapidly exported through the conductive metal selenide layer to protect the active oxide layer from self-reduction. The active [Bi2O2]2+ sublayers retain oxidation states during CO2 electroreduction due to rapid electron transfer through the conductive [Cu2Se2]2- sublayer. Theoretical calculations reveal high activity of the [Bi2O2]2+ sublayers, achieving over 90% formate selectivity. This work expands the understanding and improvement of CO2 electroreduction properties in metal oxide systems.

NATURE COMMUNICATIONS (2022)

Article Multidisciplinary Sciences

Engineering a local acid-like environment in alkaline medium for efficient hydrogen evolution reaction

Hao Tan et al.

Summary: Tuning the local reaction environment can enhance the activity of catalysts. The study found that Pt delta- nanoparticles supported on oxygen vacancy enriched MgO nanosheets can create a local acid-like environment in alkaline medium, leading to excellent hydrogen evolution reaction performances.

NATURE COMMUNICATIONS (2022)

Article Chemistry, Physical

Intramolecular hydroxyl nucleophilic attack pathway by a polymeric water oxidation catalyst with single cobalt sites

Hao Yang et al.

Summary: This study reports a molecularly well-defined water oxidation catalyst (WOC) with superior activity under alkaline and near-neutral conditions. By combining experimental and theoretical results, a pH-dependent O-O bond formation pathway was proposed, and the rate-determining step was identified. This research provides significant insights into the crucial role of electrolyte pH in water oxidation catalysis.

NATURE CATALYSIS (2022)

Article Chemistry, Physical

Amorphizing noble metal chalcogenide catalysts at the single-layer limit towards hydrogen production

Yongmin He et al.

Summary: A wafer-size amorphous PtSex film with high atom-utilization efficiency has been fabricated through a low-temperature amorphization strategy. This film acts as a single-atom-layer catalyst for high-flux hydrogen production and can potentially be extended to other noble metals.

NATURE CATALYSIS (2022)

Article Multidisciplinary Sciences

Chirality enhances oxygen reduction

Yutao Sang et al.

Summary: Controlled reduction of oxygen is crucial for clean energy technologies and aerobic organisms. Researchers have found that chiral electrodes enhance the electron transfer efficiency from oxygen, leading to lower overpotentials and higher current densities, known as the chiral-induced spin selectivity effect.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2022)

Article Multidisciplinary Sciences

Selective electrochemical reduction of CO2 on compositionally variant bimetallic Cu-Zn electrocatalysts derived from scrap brass alloys

Ibrahim M. Badawy et al.

Summary: The repurposing of scrap brass alloys as alternative electrocatalysts for CO2 reduction has been demonstrated in this study, showing improved performance in terms of current density and selectivity for CO production when galvanically replaced with silver.

SCIENTIFIC REPORTS (2022)

Article Chemistry, Physical

Probing the relationship between bulk and local environments to understand impacts on electrocatalytic oxygen reduction reaction

Brianna N. Ruggiero et al.

Summary: This study investigates the impact of electrolyte composition on the kinetics and mechanism of the oxygen reduction reaction (ORR) by monitoring local pH changes. The results demonstrate that local pH strongly dictates changes in mechanisms and performance, while the cation identity modulates local pH to influence these trends.

JOURNAL OF CATALYSIS (2022)

Article Chemistry, Physical

Highly Efficient Electrochemical CO2 Reduction on a Precise Homonuclear Diatomic Fe-Fe Catalyst

Xueyang Zhao et al.

Summary: In this study, a diatomic electrocatalyst with nitrogen-doped porous carbon-anchored homonuclear Fe2N6 sites was prepared for efficient CO2 reduction to CO. The catalyst exhibited high CO Faradic efficiency and low Tafel slope compared to single-atom Fe catalyst. Density functional theory calculations revealed that the neighboring Fe-Fe centers in the Fe2N6 site facilitated CO2 activation and decreased the reaction barrier for CO desorption.

ACS CATALYSIS (2022)

Article Nanoscience & Nanotechnology

CoNi Nanoparticle-Decorated ZIF-67-Derived Hollow Carbon Cubes as a Bifunctional Electrocatalyst for Zn-Air Batteries

Yingjie He et al.

Summary: CoNi nanoparticle-decorated hollow carbon cubes (CoNi-HCCs) were synthesized using ZIF-67 as a sacrificial template. These CoNi-HCCs exhibited superior performance in zinc-air batteries, including higher discharge potential, charge potential, and peak power density, as well as better cycling stability.

ACS APPLIED NANO MATERIALS (2022)

Article Chemistry, Physical

Proposing an unbiased oxygen reduction reaction onset potential determination by using a Savitzky-Golay differentiation procedure

Giacomo de Falco et al.

Summary: The study introduces a mathematical approach based on the second order discrete differentiation method for accurately determining the onset potential of Oxygen reduction reaction electrocatalysts. Analysis of published results suggests that common approaches like the tangent method or visual estimation may introduce human errors, while the SODDM method leads to comparable results across different researchers and instruments.

JOURNAL OF COLLOID AND INTERFACE SCIENCE (2021)

Article Electrochemistry

Improving the onset potential and Tafel slope determination of earth-abundant water oxidation electrocatalysts

Roger Sanchis-Gual et al.

Summary: This work introduces a fast and convenient method using cyclic voltammetry and coulovoltammetric responses to determine the onset potentials of three benchmark electrocatalysts. By quantifying the irreversible charges, the onset potential and Tafel slope values can be accurately determined without considering the redox contributions of the catalysts. This study demonstrates the applicability of coulovoltammetry as a powerful tool for investigating electrocatalytic performances.

ELECTROCHIMICA ACTA (2021)

Review Chemistry, Physical

Engineering Catalyst Layers for Next-Generation Polymer Electrolyte Fuel Cells: A Review of Design, Materials, and Methods

Theo A. M. Suter et al.

Summary: PEFCs are a promising replacement for fossil fuel-dependent automotive and energy sectors, but significant limitations on durability and performance remain. Research shows that Catalyst layer design has a significant impact on device power density and durability, but consensus is difficult to reach due to various factors. A wider understanding and research are needed in order to optimize performance, improve durability, and reduce costs.

ADVANCED ENERGY MATERIALS (2021)

Article Chemistry, Physical

Zirconium nitride catalysts surpass platinum for oxygen reduction

Yao Yuan et al.

NATURE MATERIALS (2020)

Article Chemistry, Physical

Cu(In,Ga)Se2 for selective and efficient photoelectrochemical conversion of CO2 into CO

Zhuofeng Hu et al.

JOURNAL OF CATALYSIS (2020)

Article Multidisciplinary Sciences

In-situ structure and catalytic mechanism of NiFe and CoFe layered double hydroxides during oxygen evolution

Fabio Dionigi et al.

NATURE COMMUNICATIONS (2020)

Article Electrochemistry

AuxPd(300-x)Alloy Nanoparticles for the Oxygen Reduction Reaction in Alkaline Media

Jamie A. Trindell et al.

CHEMELECTROCHEM (2020)

Article Chemistry, Multidisciplinary

Polyoxometalate electrocatalysts based on earth-abundant metals for efficient water oxidation in acidic media

Marta Blasco-Ahicart et al.

NATURE CHEMISTRY (2018)

Article Chemistry, Analytical

Tafel analysis in practice

Danlei Li et al.

JOURNAL OF ELECTROANALYTICAL CHEMISTRY (2018)