Ascorbic acid (AA) is an important deoxidizer contained in food, drink and medicine. However, existing detection methods are time-consuming, expensive and complex in the industrial production and quality testing. In order to address above issue, we proposed a core-shell nanowires constructed non-enzymatic sensor to achieve the highly sensitive and selective recognition of AA with a long-term reusability. The core-shell architecture was composed of Cu-Fe Prussian blue of 10 nm thickness covering 30 nm Cu nanowire. This nanocomposite couples advances of Cu and Prussian blue to possess both high electrocatalysis and electron transfer rate. The as-prepared AA sensor shows an excellent sensitivity with an ultrawide linear range from 0.01 to 3.5 mM, together with the remarkable anti-interference and reusable ability beyond 30 days. Used for four kinds of juice and bear as real samples, this sensor had accurately and rapidly reported the AA concentration with a good recovery.

Yttrium-doped barium cerate (BaCe0.8Y0.2O3-δ, BCY) is the most widely studied proton conducting material and is frequently fabricated as dense membranes for hydrogen separation. However, the difficulty to prepare dense BCY membranes is the extremely high sintering temperature, normally higher than 1500 oC. Herein, the BCY 7-channel hollow fiber membrane was prepared by one-step thermal processing (OSTP). It proved that adding Co2O3 as sintering aid is beneficial to the densification and 1wt% Co2O3 was the optimum addition to form a homogeneous phase structure. The dense sintering temperature was greatly reduced from over 1500 to 1350 oC. The hydrogen permeation flux of the BCY hollow fiber membrane reached up to 0.34 ml min-1cm-2 at 900 oC. The long-term stability test last for 300 h. The properties of OSTP samples were demonstrated to be essentially higher than samples made by conventional ceramic hollow fiber fabrication methods.