The development of high‐performance anode materials for potassium‐based energy storage devices with long‐term cyclability requires combined innovations from rational material design to electrolyte optimization. A three‐dimensional K+‐pre‐intercalated Ti3C2Tx MXene with enlarged interlayer distance was constructed for efficient electrochemical potassium‐ion storage. We found that the optimized solvation structure of the concentrated ether‐based electrolyte leads to the formation of a thin and inorganic‐rich solid electrolyte interphase (SEI) on the K+‐pre‐intercalated Ti3C2Tx electrode, which is beneficial for interfacial stability and reaction kinetics. As a proof of concept, 3D K+‐Ti3C2Tx//activated carbon (AC) potassium‐ion hybrid capacitors (PIHCs) were assembled, which exhibited promising electrochemical performances. These results highlight the significant roles of both rational structure design and electrolyte optimization for highly reactive MXene‐based anode materials in energy storage devices.

Potassium deficiency and irreversible loss of potassium at the initial cycle of potassium-ion batteries inevitably reduce their energy density and cycle life. Cathode pre-potassiation before battery assembling is an efficient...

Transition metal chalcogenides (TMCs) have been well-established as ideal low-dimensional systems for photocatalytic hydrogen evolution. Strategies toward improving the activity of these TMCs photocatalysts by crafting heterostructures have been intensively...

The homemade explosive, triacetone triperoxide (TATP), is easy to synthesize, sensitive to detonation but hard to detect directly. Vapor sensor arrays composed of a few sensor materials have the potential to discriminate TATP, but the stability of the sensor array is always a tricky problem since each sensor may encounter a device fault. Thus, a sensor array based on a single optoelectronic TiO2/PW11 sensor was first constructed by regulating the excitation wavelength to discriminate TATP from other explosives. By in situ doping of Na3PW12O40, a Keggin structure of PW11 formed on the TiO2 to promote the photoinduced electron-hole separation, thus obviously improving the detection sensitivity of the sensor film and shortening the response time. The response of the TiO2/PW11 sensor film to TATP under 365, 450 and 550 nm illumination is 81%, 42%, and 37%, respectively. The TiO2/PW11 sensor features selectivity to TATP and is able to detect less than 50 ppb. The flexibility and stability of the flexible sensor film is also demonstrated with the extent of bending. Furthermore, the sensing response cannot be affected by ambient air below 60% relative humidity.

Developing novel catalysts with both easily accessible recyclability and long-term durability toward chemicals synthesis is highly desirable yet remains to be explored. In this work, the porous and bulk sponge-confined...

Two-dimensional (2D) heterostructures have gained increased interest in recent years due to the integrated functionalities of the individual building blocks and beyond. Herein, we have fabricated 2D In2S3/Ti3C2Tx heterostructures through...

Engineering the spatial separation and transfer of photogenerated charge carriers has been one of the most enduring research topics in the field of photocatalysis due to its crucial role in...

The emission of carbon dioxide (CO2) induced by the widespread use of fossil fuels has caused global warming and climate issues. Photocatalytic CO2 reduction technology, which utilizes solar energy to convert CO2 into carbon-based fuels, provides a promising sustainable green way to ameliorate the energy crisis and reduce CO2 concentration in the atmosphere. Multicarbon products (C2+) with higher energy density and larger market value attract widespread research interests. This review is focused on the recent progress of photocatalytic reduction of CO2 to C2+ products. Starting from the discussion on the fundamental mechanism of photocatalytic CO2 conversion to C2+ products, the strategies of photocatalyst design for C2+ fuels synthesis from CO2 are summarized. Particularly, the photocatalyst optimization approaches for improving the activity and especially selectivity of CO2 reduction reaction (CRR) to access C2+ products are highlighted. Finally, some personal outlook on this research direction of photocatalytic CRR to C2+ products is presented. This review is expected to evoke more research attention on the value-added C2+ fuels synthesis from solar energy powered CRR.