Ding Wei,Lihua Yao,Song Yang,Zhentao Cui,Bingxue Wei,Minhua Cao,Changwen Hu
In2TiO5, containing both early transition metal (d0) and p-block metal (d10), is a very promising candidate for possible application in H2 production because of its suitable edges of conduction and valence bands and the crystal structure, which is considered to favor mobility of charge carriers. Herein we report, for the first time, the synthesis of novel oxygen vacancies (OV), N-doped In2TiO5 (OV,N–In2TiO5) with controllable band gap. The resultant OV,N–In2TiO5 sample was prepared by a multistep sol–gel calcination process and studied as a near-infrared (NIR) light-driven photocatalyst for H2 production. OV and N-doping can effectively extend the photoresponse of In2TiO5 to the NIR region due to an interband springboard and the reduced band gap, thus leading to efficient NIR light photocatalytic H2 production activity with Pt as a cocatalyst.
The growing need for lithium-ion batteries offering elevated energy density and rapid charging capabilities motivates the exploration of innovative high-capacity and high-rate anode materials. In this study, In2TiO5 anode is developed by merging the substantial lithium uptake from conversion-alloying processes of In2O3 with the rapid ion kinetics from insertion process of TiO2via strategic octahedral reconfiguration. By capitalizing on the bonding synergy where longer In-O bonds enable efficient and large Li storage and shorter Ti-O bonds provide robust framework and fluent ion pathways, the Ti-O frameworks can effectively confine and stabilize the volume change of In species during (de)alloying processes. Leveraging the functionalities of Ti-O and In-O bonds, the In2TiO5 anode shows a stable capacity of 550 mAh g-1 with capacity retention of 82.1% after 600 cycles at 0.1 A g-1, far exceeding In2O3 (290 mAh g-1 after 260 cycles). Even at high current density of 10 A g-1, it maintains 160 mAh g-1 with 80% retention after 1000 cycles. In situ and ex situ characterizations uncover that the LixTiO2 effectively confine the (de)alloying process of In species which enables high structural integrity during (de)lithiation. This bonding synergy strategy by unit-scale hybridization approach paves the way for engineering high-capacity and high-rate lithium-ion battery anodes.
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