One dimensional MnO₂/titanium nitride nanotube coaxial arrays have been designed for a high performance electrochemical capacitive energy storage system based on the concept of fabricating an efficient, fast charge separation network. This nanostructured composite material was prepared by electrodepositing mesoporous MnO₂ into TiN nanotube arrays (TiN NTA), which are prepared by anodization of a Ti foil substrate and subsequent nitridation using ammonia annealing. The electrodeposited mesoporous MnO₂ inside the electrically conductive framework of a TiN nanotube has been found to show high specific capacitance (681.0 F g⁻¹ at 2 A g⁻¹), excellent rate capability (55% capacitance retention from 2 to 2000 mV s⁻¹), and a long cycle life (3% capacitance loss after 1000 cycles). These results demonstrate that this coaxial composite nanostructure is very promising for high performance supercapacitors.

Ni_xCo_2x(OH)_6x, as a precursor of intensively studied NiCo₂O₄, has been directly deposited into self-standing titanium nitride nanotube array (TiN NTA) grid monolithic supports to form a coaxial nanostructured electrode for supercapacitors. With TiN NTA substrates providing a large surface area, fast electron transport, and enhanced structure stability, this Ni_xCo_2x(OH)_6x/TiN electrode exhibits superior pseudocapacitive performance with a high specific capacitance of 2543 F g^–1 at 5 mV s^–1, remarkable rate performance of 660 F g^–1 even at 500 mV s^–1, and promising cycle performance (about 6.25% capacitance loss for 5000 cycles). Interestingly, the Ni_xCo_2x(OH)_6x/TiN NTA electrode outperforms the NiCo₂O₄/TiN NTA electrode, indicating that this self-standing Ni_xCo_2x(OH)_6x/TiN NTA monolith is a promising candidate for high-performance supercapacitor applications.

Conjugated microporous polymers are explored as high-performance electrode materials for lithium and sodium storage, exhibiting excellent electrochemical performance.

Photocatalytic water splitting was observed on black phosphorus/BiVO₄ heterostructure under visible light irradiation.

Molybdenum nitride/nitrogen-doped graphene nanosheets (MoN/NGS) are synthesized and used as an alternative O₂electrode for Li–O₂ batteries. In comparison with electrocatalysts proposed previously, this hybrid cathode exhibits a high discharge potential (around 3.1 V) and a considerable specific capacity (1490 mA h g⁻¹, based on carbon + electrocatalyst).