Ruthenium dioxide
[CAS# 12036-10-1]

Identification

• Classification: Inorganic chemical industry >> Inorganic salt >> Oxides of rare earth metals, yttrium or scandium
• Name: Ruthenium dioxide
• Synonyms: Ruthenium(IV) oxide
• Molecular Formula: RuO₂
• Molecular Weight: 133.07
• CAS Registry Number: 12036-10-1
• EC Number: 234-840-6
• SMILES: O=[Ru]=O

Properties

• Density: 6.97
• Water solubility: insoluble

Safety Data

• Hazard Symbols: GHS03;GHS07 Danger
• Hazard Statements: H272-H319-H413
• Precautionary Statements: P210-P220-P264+P265-P273-P280-P305+P351+P338-P337+P317-P370+P378-P501

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Eye irritation	Eye Irrit.	2	H319
Chronic hazardous to the aquatic environment	Aquatic Chronic	4	H413
Oxidising solids	Ox. Sol.	2	H272
Oxidising solids	Ox. Sol.	1	H271
Skin irritation	Skin Irrit.	2	H315
Specific target organ toxicity - repeated exposure	STOT RE	2	H373
Specific target organ toxicity - single exposure	STOT SE	3	H335

Discovory and Applicatios

Ruthenium dioxide (RuO2) is a highly stable and conductive oxide of ruthenium that has gained significant attention in various scientific fields due to its unique properties. Discovered in the early 19th century, ruthenium dioxide is one of the key members of the platinum group metals (PGMs), and it exhibits remarkable catalytic activity, high thermal stability, and excellent electrical conductivity. These characteristics make it a valuable material in a wide range of applications, including electrochemical reactions, catalysis, and energy storage devices.

The discovery of ruthenium dioxide dates back to 1844 when it was first isolated by the German chemist Karl Karlovich. However, its commercial relevance and application began to emerge much later in the 20th century. Ruthenium dioxide is typically synthesized by the oxidation of ruthenium metal or ruthenium salts under controlled conditions, often at high temperatures in the presence of oxygen. The resulting compound is a black, crystalline material that can exist in several different polymorphs, with the most stable form being the tetragonal rutile structure.

Ruthenium dioxide’s catalytic properties have made it an essential material in electrochemical processes, particularly in fuel cells and electrolysis. It is used as a catalyst in the production of chlorine gas and in the oxidation of organic compounds. Its ability to facilitate the electrochemical oxidation of water has also made it a key component in the development of oxygen evolution reactions (OER) for energy storage systems. The material’s high conductivity and resistance to corrosion allow it to function efficiently in demanding electrochemical environments.

In addition to its role as a catalyst, ruthenium dioxide is widely used in the production of resistors and sensors due to its excellent electrical conductivity and stability. It is used as a thin-film material in electronic devices, where its high durability ensures long-term performance under extreme conditions. Its ability to operate in high-temperature environments further enhances its desirability for applications in high-performance electronics and energy devices.

Ruthenium dioxide has also been studied for its potential use in energy storage devices, such as supercapacitors and batteries. Its high surface area and excellent conductivity make it an ideal material for these applications, where fast charge and discharge cycles are required. Additionally, it has shown promise in the development of advanced catalytic materials for fuel cells and hydrogen production, further expanding its potential in the field of renewable energy.

The research on ruthenium dioxide continues to evolve, with scientists exploring its properties in various advanced applications, including nanomaterials, sensors, and energy conversion systems. Its versatility and stability make it a critical material in the ongoing development of new technologies aimed at improving energy efficiency and sustainability.

References

2003. Sorption of Arsenate and Arsenite on RuO2.xH2O: A Spectroscopic and Macroscopic Study. Environmental Science & Technology.
DOI: 10.1021/es026423d

2019. Ruthenium dioxide nanoparticles as a high-capacity transducer in solid-contact polymer membrane-based pH-selective electrodes. Microchimica Acta.
DOI: 10.1007/s00604-019-3830-x

2020. Degradation of oxamic acid using dimensionally stable anodes (DSA) based on a mixture of RuO2 and IrO2 nanoparticles. Chemosphere.
DOI: 10.1016/j.chemosphere.2020.126674