Herein we report a green approach for the synthesis of metal/metal oxide nanoparticle decorated multiwalled carbon nanotubes using focused solar radiation. The synthesis method demonstrates a large scale, cost effective and spontaneous production of carbon nanotube supported metal/metal oxide nanoparticles for energy and biological applications.

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Nitrogen-containing hierarchically porous carbon is derived by carbonizing and activating polypyrrole nanostructure (APNP) using a template-free synthesis method and is demonstrated to be an efficient counter electrode (CE) in dye-sensitized solar cells (DSSCs).