Fuad Abduro Bushira,Shimeles Addisu Kitte,Yong Wang,Haijuan Li,Ping Wang,Yongdong Jin
In this study, an effective oxygen vacancy (Ov)-involved luminol-dissolved oxygen (O2) electrochemiluminescence (luminol-DO ECL) system was developed and exploited for ECL sensing applications through significant plasmon enhancement of the Ov-involved weak luminol-DO ECL signals by the combined use of Cu-doped TiO2 oxygen vacancy and a Au@SiO2 nanomembrane. The results disclosed that the ECL response of the corresponding system could be synergistically boosted, and the plausible underlying mechanism has been discussed. Furthermore, for the first time, the developed system has been successfully applied for the highly sensitive detection of alkaline phosphatase with a low limit of detection of 0.005 U/L, with an excellent linear range from 0.005 to 10 U/L, as well as good stability and reproducibility.
Jiejie Bai,Yue Shi,Aixin Ma,Feifei Liu,Yanru Liu,Caixia Li,Jianping Lai,Lei Wang
The production of three separated, high-value chemicals (H 2 O 2 , urea and H 2 ) from CO 2 , N 2 , and H 2 O represents a significant challenge. It is a prospective and innovative way to simultaneously produce these chemicals in an anion exchange membrane (AEM) electrolyzer, which couples anodic 2e - water oxidation (2e - WOR) and cathodic CO 2 , N 2 and water reduction reaction (CNWRR), but has not yet been realized. Here, we found that bifunctional Cu x Ti 1-x O 2-y catalysts can be employed in the electrochemical production of H 2 O 2 , urea and H 2 from CO 2 , N 2 and water, and the optimized Cu 0.12 Ti 0.88 O 2-y catalyst exhibits an excellent productivity of 11.8 μmol cm −2 min −1 , 0.3 mg cm -2 h −1 and 0.82 mmol cm -2 h −1 for H 2 O 2 , urea and H 2 at 4.0 V (50 mA cm −2 ) in AEM electrolyzer, respectively. Theoretical calculations reveal that the superior performance of the 2e - WOR and CNWRR is attributed to the Cu doping effect, which not only promotes the coupling of *OH but also optimizes the adsorption energy barriers of COOH* and NNH*. It is worth noting that the AEM electrolyzer assembled by bifunctional Cu 0.12 Ti 0.88 O 2-y reaches a current density of 50 mA cm −2 with a cell voltage of 4.0 V and exhibits excellent stability of 50-hour continuous operation.
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