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The flexible pressure sensor has been credited for leading performance including higher sensitivity, faster response/recovery, wider detection range and higher mechanical durability, thus driving the development of novel sensing materials enabled by new processing technologies. Using atomic layer infiltration, Pt nanocrystals with dimensions on the order of a few nanometers can be infiltrated into the compressible lamellar structure of Ti3C2Tx MXene, allowing a modulation of its interlayer spacing, electrical conductivity and piezoresistive property. The flexible piezoresistive sensor is further developed from the Pt-infiltrated MXene on a paper substrate. It is demonstrated that Pt infiltration leads to a significant enhancement of the pressure-sensing performance of the sensor, including increase of sensitivity from 0.08 ​kPa−1 to 0.5 ​kPa−1, extension of detection limit from 5 ​kPa to 9 ​kPa, decrease of response time from 200 ​ms to 20 ​ms, and reduction of recovery time from 230 ​ms to 50 ​ms. The mechanical durability of the flexible sensor is also improved, with the piezoresistive performance stable over 1000 cycles of flexure fatigue. The atomic layer infiltration process offers new possibilities for the structure modification of MXene for advanced sensor applications.

Sr 2 Fe 2-x Mo x O 6-δ -Ce 0.8 Sm 0.2 O 1.9 (SFM-SDC) is a promising composite oxygen electrode for reversible solid oxide cells. In this study, well-dispersed Pt nanoparticles are prepared by one-cycle infiltration method using H 2 PtCl 6 aqueous solution in SFM-SDC scaffold, to form high electrocatalytic activity Pt-SFM-SDC electrode for fuel cell, steam electrolysis and CH 4 -assisted steam electrolysis processes. Systematic studies in concentration variation of H 2 PtCl 6 solution demonstrate that the discharge current of the 3.14 cm2 cell infiltrated by 0.040 M solution is significantly increased from 0.4 to 1.32 A (>3 times) at 0.5 V at 800 °C while the electrolysis current is effectively enhanced from 0.8 to 3.28 A (>4 times) at 1.5 V. Moreover, cells with Pt-SFM-SDC electrode applied in CH 4 -assisted electrolysis process realized a remarkable reduction of power consumption. Impedance analysis and morphological observation results suggest that appropriate H 2 PtCl 6 concentration has a positive effect on surface exchange and gas diffusion process at oxygen electrode side. [Display omitted] • One cycle Pt infiltration method with H 2 PtCl 6 solution is proposed. • The effect of H 2 PtCl 6 solution concentration is investigated. • Pt nanoparticles enhance the electroactivities of SFM-SDC electrode simultaneously toward ORR, OER and POM reactions. [ABSTRACT FROM AUTHOR]