Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Interfacial engineering core@shell nanoparticles for active and selective direct H2O2 generation

19.09.2018

Hydrogen peroxide (H2O2) is a versatile chemical in modern industry, widely applied in many different fields. To date, H2O2 is industrially manufactured by an indirect process that involves the sequential hydrogenation and oxidation of alkyl anthraquinone, which is however a multi-step process with high-cost and energy-intensive. On the sharp contrary, the direct synthesis of H2O2 from H2 and O2 is expected to be the most efficient way to produce H2O2 due to the remarkable advantages of atom economy, low energy consumption and only by-product of H2O.

Hitherto, the direct synthetic route is mainly achieved by the supported Pd-based catalysts. The major problem associated with that is related to the low selectivity of H2O2. Despite great efforts have been devoted to constructing the Pd-based catalysts by introducing the second metals, understanding high-performance Pd-based catalysts for the direct H2O2 generation from either deep characterization or theoretical investigation are still extremely limited.


This is a schematic illustration showing the activity and selectivity toward H2O2 synthesis of 5 wt% Pd@Ni-3/TiO2, 5 wt% Pd@NiO-x/TiO2 (x = 1, 2, 3, 4), 5 wt% Pd@void@Ni-3/TiO2 and 5 wt% Pd/TiO2.

Credit: ©Science China Press

In a new overview published in the Beijing-based National Science Review, scientists at the Soochow University present the latest advances in direct H2O2 generation. Co-authors Yonggang Feng, Qi Shao, Bolong Huang, Junbo Zhang, and Xiaoqing Huang developed a class of Pd@NiO-x nanoparticles with unique core@shell interface structure, which achieves high activity, selectivity and stability for the direct H2O2 synthesis.

These scientists likewise interpreted the mechanism from both electronic and energetic views.

"Traditional Pd-based catalysts are very active for the side reactions, such as the decomposition and hydrogenation of H2O2 as well as the formation of H2O," they state in an article titled "Surface engineering in the interface of core/shell nanoparticles promotes hydrogen peroxide generation".

"It is considered that the intrinsic surface property of Pd-based catalysts is essential for the selectivity and activity of the direct H2O2 synthesis," they add. "This arises because the barrier for O-O bond scission is sensitive to Pd surface structure, the key parameter governing H2O2 synthesis and decomposition activity."

The creation of porous NiO shell is beneficial for exposing Pd active sites and thus enhancing the productivity of H2O2. "By tuning the composition of Pd@NiO-x NPs and the reaction condition, the efficiency of H2O2 synthesis could be well optimized with 5 wt% Pd@NiO-3/TiO2 exhibiting the highest productivity (89 mol/(kgcath)) and selectivity (91%) to H2O2 as well as excellent stability," they state.

"The first principles simulations further revealed the mechanism from both electronic and energetic views," the scientists interpreted. "The superiority in selectivity is achieved by a spontaneous bond scission of H-H and charge transfer from O20 to O22- within the cavity of NiO interfacing with Pd surface.,"

"The high selectivity and activity making it one of the best catalysts for the direct H2O2 synthesis reported to date," they add. "The present work reported here highlights the importance of surface and interface engineering of Pd-based catalysts for the direct H2O2 synthesis with largely enhanced activity and selectivity."

###

This research received funding from the Ministry of Science and Technology (2016YFA0204100, 2017YFA0208200), the National Natural Science Foundation of China (21571135), Young Thousand Talented Program, Jiangsu Province Natural Science Fund for Distinguished Young Scholars (BK20170003), the project of scientific and technologic infrastructure of Suzhou (SZS201708), the start-up supports from Soochow University, and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

See the article:

Yonggang Feng, Qi Shao, Bolong Huang, Junbo Zhang, and Xiaoqing Huang
Surface Engineering in the Interface of Core/Shell Nanoparticles Promotes Hydrogen Peroxide Generation
Natl Sci Rev
https://doi.org/10.1093/nsr/nwy065

The National Science Review is the first comprehensive scholarly journal released in English in China that is aimed at linking the country's rapidly advancing community of scientists with the global frontiers of science and technology. The journal also aims to shine a worldwide spotlight on scientific research advances across China.

Media Contact

Xiaoqing Huang
hxq006@suda.edu.cn

http://www.scichina.com/ 

Xiaoqing Huang | EurekAlert!
Further information:
http://dx.doi.org/10.1093/nsr/nwy065

Further reports about: Interfacial Nanoparticles catalysts decomposition hydrogen peroxide

More articles from Life Sciences:

nachricht RUDN chemist tested a new nanocatalyst for obtaining hydrogen
18.10.2018 | RUDN University

nachricht Dandelion seeds reveal newly discovered form of natural flight
18.10.2018 | University of Edinburgh

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Goodbye, silicon? On the way to new electronic materials with metal-organic networks

Scientists at the Max Planck Institute for Polymer Research (MPI-P) in Mainz (Germany) together with scientists from Dresden, Leipzig, Sofia (Bulgaria) and Madrid (Spain) have now developed and characterized a novel, metal-organic material which displays electrical properties mimicking those of highly crystalline silicon. The material which can easily be fabricated at room temperature could serve as a replacement for expensive conventional inorganic materials used in optoelectronics.

Silicon, a so called semiconductor, is currently widely employed for the development of components such as solar cells, LEDs or computer chips. High purity...

Im Focus: Storage & Transport of highly volatile Gases made safer & cheaper by the use of “Kinetic Trapping"

Augsburg chemists present a new technology for compressing, storing and transporting highly volatile gases in porous frameworks/New prospects for gas-powered vehicles

Storage of highly volatile gases has always been a major technological challenge, not least for use in the automotive sector, for, for example, methane or...

Im Focus: Disrupting crystalline order to restore superfluidity

When we put water in a freezer, water molecules crystallize and form ice. This change from one phase of matter to another is called a phase transition. While this transition, and countless others that occur in nature, typically takes place at the same fixed conditions, such as the freezing point, one can ask how it can be influenced in a controlled way.

We are all familiar with such control of the freezing transition, as it is an essential ingredient in the art of making a sorbet or a slushy. To make a cold...

Im Focus: Micro energy harvesters for the Internet of Things

Fraunhofer IWS Dresden scientists print electronic layers with polymer ink

Thin organic layers provide machines and equipment with new functions. They enable, for example, tiny energy recuperators. In future, these will be installed...

Im Focus: Dynamik einzelner Proteine

Neue Messmethode erlaubt es Forschenden, die Bewegung von Molekülen lange und genau zu verfolgen

Das Zusammenspiel aus Struktur und Dynamik bestimmt die Funktion von Proteinen, den molekularen Werkzeugen der Zelle. Durch Fortschritte in der...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Conference to pave the way for new therapies

17.10.2018 | Event News

Berlin5GWeek: Private industrial networks and temporary 5G connectivity islands

16.10.2018 | Event News

5th International Conference on Cellular Materials (CellMAT), Scientific Programme online

02.10.2018 | Event News

 
Latest News

RUDN chemist tested a new nanocatalyst for obtaining hydrogen

18.10.2018 | Life Sciences

Massive organism is crashing on our watch

18.10.2018 | Earth Sciences

Electrical enhancement: Engineers speed up electrons in semiconductors

18.10.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>