Inkjet-printing (IJP) technology is recognized as a significant breakthrough in manufacturing high-performance electrochemical energy storage systems. In comparison to conventional fabrication protocols, this printing technique offers various advantages, such as contact-less high-resolution patterning capability; low-cost, controlled material deposition; process simplicity; and compatibility with a variety of substrates. Due to these outstanding merits, significant research efforts have been devoted to utilizing IJP technology in developing electrochemical energy storage devices, particularly in supercapacitors (SCs). These attempts have focused on fabricating the key components of SCs, including electrode, electrolyte, and current collector, through rational formulation and patterning of functional inks. In an attempt to further expand the material design strategy and accelerate technology development, it is urgent and essential to obtain an in-depth insight into the recent developments of inkjetprinted SCs. Toward this aim, first, a general introduction to the fundamental principles of IJP technology is provided. After that, the latest achievements in IJP of capacitive energy storage devices are systematically summarized and discussed with a particular emphasis on the design of printable functional materials, the printing process, and capacitive performance of inkjet-printed SCs. To close, existing challenges and future research trends for developing state-of-the-art inkjet-printed SCs are proposed.

The ever increasing need for renewable and clean energy resources as well as environmental concerns are considered as two seriousc hallenges of today's society.P hotocatalysis has proved to be ar eliable ande ffective technology to overcome these issues. However, to bring the full potential of this approach into reality,t wo main hurdles of fast charge recombination and the limited visible light absorption should be tackled. To address these obstacles, nanocomposites based on titanium dioxide nanostructures and semiconducting two-dimensional transition-metal dichalcogenidesh ave been developed and proven to be excellent photocatalysts.I nt his review,w ew ill overview the recent developments on the fabrication and rational design of these nanocomposites both for hydrogen productiona nd photocatalytic degradation of pollutants with emphasis on those appealing structures.

Layered transition metal dichalcogenides (TMDs) have received a great deal of attention due to fact that they have varied band gap, depending on their metal/chalcogen composition and on the crystal structure. Furthermore, these materials demonstrate great potential application in a myriad of electrochemical technologies. Heterogeneous electron transfer (HET) abilities of TMD materials toward redox-active molecules occupy a key role in their suitability for electrochemical devices. Herein, we introduce a promising biosensing strategy based on improved heterogeneous electron transfer rate of WS 2 , WSe 2 , and WTe 2 nanosheets exfoliated using tert-butyllithium (t-BuLi) and n-butyllithium (n-BuLi) intercalators decorated with vertically aligned TiO 2 nanoplatelets. By comparison of all the nanohybrids, decoration of TiO 2 on t-BuLi WS 2 (TiO 2 @t-BuLi WS 2 ) results in the fastest HET rate of 5.39 × 10 −3 cm s −1 toward ferri/ferrocyanide redox couple. In addition, the implications of decorating tungsten dichalcogenides (WX 2 ) with TiO 2 nanoplatelets in enzymatic biosensor applications for H 2 O 2 detection are explored. TiO 2 @t-BuLi WS 2 outperforms all other nanohybrid counterparts and is demonstrated to be an outstanding sensing platform in enzyme-based biosensor with wide linear range, low detection limit, and high selectivity. Such conceptually new electrocatalytic detection systems shall find the way to the next generation biosensors.

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