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The growth of semiconducting single-walled carbon nanotubes (s-SWNTs) on flat substrates is essential for the application of SWNTs in electronic and optoelectronic devices. We developed a flexible strategy to selectively grow s-SWNTs on silicon substrates using a ceria-supported iron or cobalt catalysts. Ceria, which stores active oxygen, plays a crucial role in the selective growth process by inhibiting the formation of metallic SWNTs via oxidation. The so-produced ultralong s-SWNT arrays are immediately ready for building field effect transistors.

An alkaline-acid Zn-H O fuel cell is proposed for the simultaneous generation of electricity with an open circuit voltage of about 1.25 V and production of H with almost 100 % Faradic efficiency. We demonstrate that, as a result of harvesting energy from both electrochemical neutralization and electrochemical Zn oxidation, the as-developed hybrid cell can deliver a power density of up to 80 mW cm and an energy density of 934 Wh kg and maintain long-term stability for H production with an output voltage of 1.16 V at a current density of 10 mA cm .

Here, the perovskite nucleation process was controlled, producing films with optimized morphology and crystal orientation via the application of selective solvent annealing.

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