S, N co-doped carbon nanotube-encapsulated CoS2@Co

September 04, 2018

Electrochemical water splitting is favorable strategy to produce high-purity H2. The current mainstream catalysts for water electrolysis are precious metals (Pt, RuO2, IrO2), which possess superior catalytic activity, relatively low over-potential and favorable catalytic kinetics, but their high cost and poor cycle stability is still unaffordable. Therefore, it is urgent to develop a new type of hydrogen production catalyst with low cost, high catalytic activity and high stability.

Due to its low cost, high abundance, and good electrical conductivity, the transition metal-Co and its derivatives have shown great promise in electrocatalysis. However, stability has been a big issue due to their high chemical activities. To address this issue, encapsulation of Co nanoparticles into carbon shell has been proposed as an effective strategy to inherit the high electrocatalytic activity of the transition metal, and further prevent its corrosion from the harsh electrolytic environment. By tuning the metal composition and structure of carbon layers, the catalytic properties of these composites can be regulated.

Recently, Liu Zhao-Qing's group of Guangzhou University reports a bifunctional catalyst, transition metal cobalt ions induced the self-growth of nitrogen doped carbon nanotubes, which are further vulcanized to incorporate sulfur into the carbon nanotubes framework. The obtained materials (S, N-CNTs/CoS2@Co) exhibit excellent HER and OER performance. As cathode and anode, S, N-CNTs/CoS2@Co can rapidly dissociate water molecules to produce hydrogen and oxygen gases, requiring only 1.633 V to reach a current density of 10 mA cm-2, and a strong stability under various operating currents is also observed.
-end-
See the article:

Jing-Yu Wang, Ting Ouyang, Nan Li, Tianyi Ma, Zhao-Qing Liu. S, N co-doped carbon nanotube-encapsulated core-shelled CoS2@Co nanoparticles: efficient and stable bifunctional catalysts for overall water splitting, Science Bulletin, 2018, DOI: 10.1016/j.scib.2018.07.008.

https://www.sciencedirect.com/science/article/pii/S2095927318303293

Science China Press

Related Metal Composition Articles from Brightsurf:

Success in controlling perovskite ions' composition paves the way for device applications
Hybrid organic-inorganic perovskites have received much attention as potential next generation solar cells and as materials for light-emitting devices.

Chemists studied the composition of oils extracted from popular medicinal plants
A team of Russian and Vietnamese chemists from RUDN University, Belgorod State University, Ton Duc Thang University, and the Vietnam Academy of Science and Technology were the first to study the composition of oils extracted from two flowering plants of the genus Thladiantha that are popular in traditional Chinese medicine.

Host genetic factors shape composition of virus communities
Plants can be infected by multiple viruses at once. However, the composition of the pathogen community varies, even if individuals belong to the same species and the same population.

Gut microbiome composition is associated with age and memory performance in pet dogs
Our gut microbiota can crucially influence our behaviour and neurodevelopment.

New genetic markers of glucosinolates in rapeseed may help improve oil composition
A group of scientists performed a genetic analysis of the Russian rapeseed collection.

Children with type 1 diabetes may have a less desirable gut bacteria composition
Children with type 1 diabetes have a less desirable gut microbiome composition which may play a role in the development of the disease, according to new research published in the Endocrine Society's Journal of Clinical Endocrinology & Metabolism.

Understanding the role of cardiorespiratory fitness and body composition in brain health
Researchers at the Beckman Institute at the University of Illinois at Urbana-Champaign have demonstrated that brain chemistry is sensitive to fitness and body composition.

New rules for the physical basis of cellular organelle composition
New findings about critical cellular structures have upended common assumptions about their formation and composition and provided new insight how molecular machines are built in living cells.

ALMA reveals unusual composition of interstellar comet 2I/Borisov
A galactic visitor entered our solar system last year -- interstellar comet 2I/Borisov.

'Mars quakes': First seismological data help understand the Red Planet's composition
Almost 14 months after the landing of NASA's InSight Mission on Mars, researchers present the first data ever gathered on the Red Planet's seismic activity.

Read More: Metal Composition News and Metal Composition Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.