Universal Journal of Electrochemistry

A New Concept for the Electrosynthesis of Nanosized Nickel Oxyhydroxide Alloys for Alkaline Oxygen Evolution

Dario Delgado — 2023-07-21

The objective of this concept article is to develop a new method for synthesizing nickel hydroxides, with a special interest in nickel oxyhydroxide (NiOx), which is extensively studied as an electrocatalyst for the alkaline oxygen evolution reaction (OER) in water electrolysis for hydrogen generation. The adoption of hydrogen economy faces several challenges, but effective OER catalysts can help to generate hydrogen cost-effectively for energy. We propose using the electrodeposition of NiOx from a redox surfactant microemulsion to create nanoscale NiOx particles that enhance the material’s electronic and geometric properties, leading to maximum energy efficiency for the OER. The microemulsion approach is a bottom-up technique that can be performed at low temperatures, making it a low-cost method. This technique can be used to synthesize other nanoscale materials.

Publisher’s Note: Universal Journal of Electrochemistry—A New Open Access Journal

Hang Gao — 2023-07-21

Electrochemistry is a branch of physical chemistry focusing on the movement of electrons. It is comprised of synthetic electrochemistry, quantum electrochemistry, semiconductor electrochemistry, organic conductor electrochemistry, spectroelectrochemistry, bioelectrochemistry and many other subcategories. At present, electrochemistry has been applied in various fields of physical, chemical and biological sciences.

How to Estimate Thermodynamic Data and Verify Relationships Using Simple Electrochemistry

Rudolf Holze — 2023-09-21

Experimental determination of thermodynamic quantities can be very simple, but some suggested procedures can be complicated and cumbersome. They can be almost impossible in the student’s laboratory in chemistry education. Electrochemistry provides easy and simple access to those data for chemical reactions which can be executed in an electrochemical cell. Two examples are presented and discussed, their results are critically examined.

Suppression of Polysulfide Dissolution and Shuttling with Diphenyl Disulfide Electrolyte for Lithium Sulfur Batteries

Chunhui Gao — 2023-09-11

Lithium-sulfur (Li-S) systems have been rising stars in new battery technologies beyond lithium-ion battery rea, but the dissolution and shuttle of lithium polysulfide seriously deteriorate the cycling performance. Herein, we proposed diphenyl disulfide (DPDS) as the electrolyte additive for Li-S batteries. DPDS can interact with the discharge intermediate S2- 4/S2- 6 ions, changing the stable form of lithium polysulfide in the electrolyte, inhibiting the shuttle of lithium polysulfide, and protecting the lithium anode. The initial discharge specific capacity of a Li-S battery with conventional electrolyte at 0.5 C is 1352.6 mAh/g, and the specific capacity of a Li-S battery with 200 cycles is 790.5 mAh/g. The initial discharge specific capacity of the battery containing 5.0 wt.% DPDS electrolyte at 0.5 C was 1296.3 mAh/g, and the capacity after 200 cycles was 899.9 mAh/g.

Corrosion in Supercapacitors- An Overview

Xuan Xie — 2023-10-16

Corrosion of metals and carbon in its numerous forms and of further functional materials like metal oxides used as active masses and auxiliary materials in supercapacitors, contributes to both ageing and degradation of supercapacitors of the various established types. Examples, symptoms and mechanisms of the degradation on the material/electrode and the device level are presented and discussed. Remedies and suggestions are indicated to avoid this unwanted contribution to device ageing and failure.