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Rational geometrical engineering of palladium sulfide multi-arm nanostructures as a superior bi-functional
1Materials Research Centre, Indian institute of Science, Bangalore-560012, India. nanda@mrc.iisc.ermet.in.
Nanoscale
|August 22, 2017
Summary
Researchers developed a cost-effective method to create palladium sulfide nanostructures for fuel cells. These novel catalysts show superior performance in oxygen reduction and methanol electro-oxidation reactions compared to platinum-based materials.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Efficient electrocatalysts are crucial for fuel cell performance.
- Platinum-based catalysts are effective but expensive.
- Developing alternative, cost-effective catalysts is essential.
Purpose of the Study:
- To synthesize palladium sulfide nanostructures with tunable geometries.
- To evaluate their catalytic activity for oxygen reduction reaction (ORR) and methanol electro-oxidation (MOR).
- To explore their potential as platinum-free electrocatalysts.
Main Methods:
- A one-step, single-pot, surfactant-free, electroless synthesis method.
- Mild reaction temperatures.
- Electrochemical characterization of synthesized nanostructures.
Main Results:
- Palladium sulfide nanostructures exhibited tunable geometries and high electrochemical active surface area.
- Superior performance in ORR compared to commercial Pt-C/PdS catalysts, with positive on-set potentials and better cyclic stability.
- High mass activity and superior operational stability in MOR, demonstrating bi-functional catalytic behavior.
Conclusions:
- The developed palladium sulfide nanostructures are promising Pt-free electrocatalysts for fuel cells.
- Their tunable geometry and high activity make them suitable for both ORR and MOR.
- This economic synthesis route offers a viable alternative to precious metal catalysts.
