Rational designing Mo-based heterojunction catalysts as hydrogen evolution catalysts is seriously significant for the widespread utilization of hydrogen energy. Here, the ingenious hierarchical construction of MoP 2 /MoS 2 nanowires was delivered with high conductivity of porous MoP 2 and abundant active sites of defect-rich MoS 2 . Under synergistic effect of two materials, this catalyst achieves a dramatically optimized electronic structure to boost hydrogen evolution in all-pH range. The optimal MoP 2 /MoS 2 /CC nanoreactor showed overpotentials of 47.11, 60.16, and 89.83 mV to drive −10 mA cm −2 and Tafel slopes of 51.69, 52.04, and 73.79 mV dec −1 in acidic, alkaline, and neutral media, respectively. This finding may provide an effective approach for elevating the pH-universal electrocatalytic performance in order to achieve industrial hydrogen evolution.
The peptide MOp2 obtained from Moringa oleifera seeds showed good antimicrobial activity. However, the stability of its activity has not yet been studied. In the present study, MOp2-loaded thiolated chitosan-stabilized (CMOp2) Pickering emulsion was prepared and applied to prolong the shelf life of grass carp. The encapsulation rate of MOp2 was 57.7% in CMOp2. In addition, the effects of different concentrations of CMOp2 solid particles and pH on droplet size, zeta optional and storage stability of Pickering emulsions were evaluated; the best condition for preparing Pickering emulsion through experiment was 1.75% CMOp2 solid particles at pH 9.5. Moreover, morphological observations and rheological analysis indicated that Pickering emulsions were considered a water-in-oil emulsion with typical non-Newtonian fluid characteristics. Furthermore, the prepared Pickering emulsion could significantly inhibit the growth of Escherichia coli and Staphylococcus aureus . Besides, Pickering emulsion effectively prevented spoilage of grass carp, and the Pickering emulsion-treated group reduced its pH, TVB-N and color values, inhibited microbial growth, and extended shelf life to 9 day at the storage of 4 °C. Overall, the present findings provide a reference for the application of MOp2-loaded Pickering emulsions in food preservation.
Electrochemical fixation of CO 2 in molten salts as carbides for catalyzing the hydrogen evolution reaction can contribute to carbon neutrality and value-added conversion of CO 2 as well as facilitate the production of sustainable green hydrogen energy. However, the functional ability of the CO 2 -derived carbides still needs to be substantially improved. Herein, heterostructuring the CO 2 -derived Mo 2 C layer with MoP 2 is realized via electro-splitting of CO 2 in Ca 3 (PO 4 ) 2 -containing molten salt. The as-designed Mo 2 C–MoP 2 heterostructure layer presents significantly improved HER performances, namely overpotential being 109 mV @ 100 mA cm −2 and stability for 600 h @ 200 mA cm −2 , greatly outperforming both the bare Mo 2 C layer and commercial Pt candidates. The superior performances of the Mo 2 C–MoP 2 heterostructure are in one way attributed to the modified electronic structure that decrease the energy barrier of the Volmer rate-determining step for HER. In another way, the Mo 2 C–MoP 2 dual-phase increases the hydrophilicity ability of the catalytic layer, accelerating the detachment of the H 2 bubbles. The results can provide new insights for both value-added fixation of carbon dioxide and preparation of high-performance non-noble electrocatalyst.
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