This work disclosed the trade-off effect of two metal sites, which display distinct, key functionalities in naturally occurring and artificial catalysts for developing an advanced CO 2 reduction system. To exploit the metal−organic frameworks (MOFs) as advanced catalysts, we prepared a series of Prussian blue analogues (FeNi x PBAs) of tunable Ni/Fe molar ratio without changing the oxidation state of Fe and Ni for use as a photocatalyst in the CO 2 reduction reaction (CRR). The FeNi 0.66 PBA gives a superior CO yield rate (14.28 mmol•g −1 • h −1 ) with nearly 100% CO selectivity, but the PBA would be basically CRR-inactive without either Ni or Fe. Experimental and calculation studies demonstrate that Fe and Ni display distinct functionalities. Specifically, Fe is an efficient mediator that boosts the electron transfer both from the photosensitizer to FeNi x PBA and from FeNi x PBA to CO 2 , and Ni serves as the active site for CO 2 adsorption and reduction. Intriguingly, when there is already sufficient Ni in the catalyst, further increase of the Ni content gives marginal gains in the CO 2 adsorption affinity that cannot offset the weakened electron transfer due to the Ni excess. The findings can help advance the design of bimetallic MOF catalysts that mimic naturally occurring bimetallic catalysts.
The propagation of short videos is an important way to spread information on modern social media. The youth group is a major group to receive short video information, and the shaping of their values is closely related to the transmission of the short video. Based on the ELM model, this paper makes a framework integration and research on the communication effect and impact of short videos on social media, and finds that by analyzing the influence of the central path, such as the theme and quality of short videos and the peripheral paths, such as the information source characteristics and the surface situation of information transmitters in different degrees, there are some suggestions on cultivating college students' values of short videos from three aspects: increasing the spread recognition which includes conveying positive emotional experiences content and marginal factors to strengthen social identity, spreading engagement aiming at enhancing the subjectivity of the educated and communication value of short videos for the propose of enhancing students' moral value guidance and cultural transmission concept.
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