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Mesoporous metallic rhodium nanoparticles.

Bo Jiang^1,2, Cuiling Li¹, Ömer Dag³

¹International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.

Nature Communications

|May 20, 2017

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Researchers developed a new method to create mesoporous rhodium (Rh) nanoparticles, enhancing methanol oxidation catalysis by 2.6 times. These stable nanoparticles also show promise for nitric oxide remediation.

Area of Science:

Nanomaterials Science
Catalysis
Surface Chemistry

Background:

Mesoporous noble metals offer abundant active sites and accessible surfaces, making them promising catalysts.
Previous methods for synthesizing mesoporous noble metals (Pt, Pd, Au) exist, but mesoporous rhodium (Rh) via chemical reduction was unachieved due to Rh's high surface energy.

Purpose of the Study:

To develop a scalable method for synthesizing mesoporous rhodium (Rh) nanoparticles.
To evaluate the catalytic performance of the synthesized mesoporous Rh nanoparticles in methanol oxidation and nitric oxide remediation.

Main Methods:

Chemical reduction of Rh precursors on polymeric micelle templates, specifically poly(ethylene oxide)-b-poly(methyl methacrylate) (PEO-b-PMMA).
Characterization of the mesoporous Rh nanoparticle structure and surface area.

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Testing catalytic activity for methanol electro-oxidation and nitric oxide (NO) remediation in oxygen-rich conditions.

Main Results:

Successful synthesis of mesoporous Rh nanoparticles using a scalable chemical reduction route.
Achieved a ~2.6 times enhancement in electrocatalytic oxidation of methanol compared to commercial Rh catalysts.
Demonstrated remarkable thermal stability of the mesoporous Rh structure up to 400°C.
Exhibited superior catalytic activity for nitric oxide (NO) remediation in lean-burn exhaust with high O2 concentrations.

Conclusions:

A novel, scalable method for producing mesoporous Rh nanoparticles has been established.
The synthesized mesoporous Rh exhibits significantly enhanced catalytic activity for methanol oxidation and NO remediation.
The high surface area and thermal stability of mesoporous Rh make it a highly promising catalyst for various applications.