Ti2Nb2O9/graphene hybrid anode with superior rate capability for high-energy-density sodium-ion capacitors

Multicolor luminescent material based on interaction between TiNbO5− nanosheets and lanthanide ions for visualization of pH change in inorganic gel electrolyte

“…12 Although the detailed structure of Ti 2 Nb 2 O 9 has not been clarified because of its poor crystallinity, the XRD pattern for 400 °C-annealed Eu 3+ /Tb 3+ -TiNbO 5 − was similar to the reported pattern for Ti 2 Nb 2 O 9 . 13 FE-SEM images of Eu 3+ /Tb 3+ -TiNbO 5 − after annealing at 200–400 °C showed severe aggregation (Fig. S9b and c†).…”

“…Direct visualization of proton diffusion and/or proton concentration is required to understand the proton dynamics at the electrolyte/electrode interface during water electrolysis or fuel cell operation. To monitor the proton dynamics under severe chemical environments, inorganic materials such as transition metal oxides (TMOs) are candidate host materials, since they offer great advantages such as mechanical durability, long-term reusability under UV-light irradiation, and chemical stability over a wide range of pH (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14). However, there are few reports on such materials showing multicolor luminescence changes in response to proton dynamics such as changes in pH.…”

Nb-Based Mixed Oxides As Anodes for Metal-Ion Capacitors: Progress, Challenge, and Perspective

“…To more intuitively compare the performances of LICs assembled by NBMOs, Figure 8h compares the relationship between PD and ED of each device. Other NBMOs assembled into Li-ion half-cells exhibit excellent rate capability and cycling performance and are also potential candidates for LICs as anode materials, as shown in Table 1 86 The SICs assembled with Ti 2 Nb 2 O 9 /rGO as anode and AC as the cathode could exhibit a maximum ED of 96 Wh kg −1 at a PD of 75 W kg −1 . In terms of cycling stability, the SICs retained 79% of the capacity at 1 A g −1 after 10000 cycles.…”

“…presented a novel layered titanoniobate (HTi 2 NbO 7 ) applied for sodium storage (Figure e). Unlike ANb 2 O 6 , froodite SnNb 2 O 6 is composed of Sn 2+ ions and double-layered octahedral NbO 6 units built by edge-sharing octahedral NbO 6 units, which have been reported to store lithium. , H 0.92 K 0.08 TiNbO 5 , Sn 2 Nb 2 O 7 , CsTi 2 NbO 7 , Ti 0.61 Nb 1.29 O 4 , Ti 0.75 Nb 0.25 O 2 , , Ti 2 Nb 2 O 9 , , and K 4 Nb 6 O 17 (KNO) − were reported as well in previous studies. In general, these structures provide a large number of ion intercalation sites and is a potential ideal anode material.…”

“…Compounding with carbon materials remains the most common strategy. HTiNbO 5 NSs were mixed with graphene, and then the mixture was heated topologically to Ti 2 Nb 2 O 9 and generated rGO (Ti 2 Nb 2 O 9 /rGO) . The SICs assembled with Ti 2 Nb 2 O 9 /rGO as anode and AC as the cathode could exhibit a maximum ED of 96 Wh kg –1 at a PD of 75 W kg –1 .…”