Lattice Oxygen Activation through Deep Oxidation of Co4N by Jahn-Teller-Active Dopants for Improved Electrocatalytic Oxygen Evolution.

Triggering the lattice oxygen oxidation mechanism is crucial for improving oxygen evolution reaction (OER) performance, because it could bypass the scaling relation limitation associated with the conventional adsorbate evolution mechanism through the direct formation of oxygen-oxygen bond. High-valence transition metal sites are favorable for activating the lattice oxygen, but the deep oxidation of pre-catalysts suffers from a high thermodynamic barrier. Here, taking advantage of the Jahn-Teller (J-T) distortion induced structural instability, we incorporate high-spin Mn3+ ( t 2 g 3 e g 1 ${{t}_{2g}^{3}{e}_{g}^{1}}$ ) dopant into Co4N. Mn dopants enable a surface structural transformation from Co4N to CoOOH, and finally to CoO2, as observed by various in situ spectroscopic investigations. Furthermore, the reconstructed surface on Mn-doped Co4N triggers the lattice oxygen activation, as evidenced experimentally by pH-dependent OER, tetramethylammonium cation adsorption and online electrochemical mass spectrometry measurements of 18O-labelled catalysts. In general, this work not only offers the introducing J-T effect approach to regulate the structural transition, but also provides an understanding about the influence of the catalyst's electronic configuration on determining the reaction route, which may inspire the design of more efficient catalysts with activated lattice oxygen.

The effect of nurses' perceived stress on their work engagement and perceived professional benefit during the routine management of the Corona Virus Disease 2019 Pandemic.

BACKGROUND: In a previous study, more attention has been given to the psychological state of doctors than to that of nurses although the workload, working hours, and patient contact time are generally higher for nurses than doctors. The current status of nurses' perceived stress, work engagement, and perceived professional benefit during the routine management of the Corona Virus Disease 2019(COVID-19) pandemic and how their perceived stress affects the other two variables are topics that merit research attention. OBJECTIVE: In this study, the status of nurses' perceived stress, work engagement, and perceived professional benefit during the routine management of the Corona Virus Disease 2019 pandemic was investigated to explore whether their perceived stress level has any effect on the other two variables. METHODS: The convenience sampling method was adopted, and 669 nurses from the First People's Hospital of Jingzhou were selected to participate in this study. Questionnaires on perceived stress, work engagement, and perceived professional benefit were used in the survey, and the data were processed using the SPSS 20.0 program for the descriptive statistics, independent sample t-test, analysis of variance. RESULTS: The total score of the nurses' perceived stress was 18.58±4.37 points. The total scores of their work engagement (43.32±14.01) and perceived professional benefit (140.23±17.75). CONCLUSION: The nurses' total perceived stress score was at an upper-middle level, and their total work engagement and perceived professional benefit scores were relatively high. Overall, perceived stress has a negative effect on nurses' work engagement and perceived professional benefit. That is, the higher the pressure perception of nurses, the lower the degree of work engagement and perceived professional benefit.