| The objective of electrochemistry is to investigate the charge transfer processes atheterogeneous interfaces, generally involving solid/liquid (S/L) and liquid/liquid (L/L)interfaces.This thesis, on the one hand, is devoted to the study of the S/L modifications on thebasis of the currently widely attracted graphene materials. On the other hand, focusing on thechallenges in the ion transfer at liquid/liquid interfaces, we proposed a new methodology andmechanism to study some important ions transfer behaviors. The detailed projects aredescribed as follows:(1) A new interfacial electrochemical technique of double pulse potentialelectrodepositionwas introduced to controllably prepare silver nanocrystals on graphenethin film electrode. This technique can individually control the nucleation and growthprocesses of silver nanocrystals by virtue of two pulse potential. In the experiments, weobserved the AgNCs growth process and also study their growth mechanism in detail, forexample the graphene template effect. Furthermore, this material was applied to modifythe S/L interface and toexplore its electrocatalytical performances toward hydrogenperoxide (H2O2).Finally, based on the good electrocatalytical ability, we fabricated twotypes of biosensors, H2O2and glucose which show good sensor performances.(2) In terms of the same double pulse potential electrodeposition technique, we alsocontrollably preparedanother kind of graphene based nanocomposites,graphene-molybdenum nanohybrid thin film, and gave an extensive study towardhydrogen electrocatalysis.This material reveals low overpotential and good stability,offering potential applications in future fuel cell.(3) For the liquid/liquid interface electrochemistry, some typical heavy ions transfer, locatedout of the polarized potential window,have been successfullymeasured. Andmeanwhile, anew mechanism of selective ion transfer based on concentration effect was proposed,which provides an insight to understandthe ion transport at cell membrane. |
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