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@ARTICLE{Kumar:943384,
      author       = {Kumar, Abhishek and Bettinger, Mathieu F. and Vibhu,
                      Vaibhav and Bouvet, Marcel and Meunier-Prest, Rita},
      title        = {{C}orrelation of hierarchical porosity in nanoporous gold
                      with the mass transport of electron
                      transfer-coupled-chemical reactions},
      journal      = {Journal of electroanalytical chemistry},
      volume       = {931},
      issn         = {1572-6657},
      publisher    = {Elsevier},
      reportid     = {FZJ-2023-00979},
      pages        = {117186},
      year         = {2023},
      abstract     = {Optimization of mass transfer within a porous material is a
                      highly promising strategy to improve the efficiency of
                      electrode reactions. Herein, nanoporous gold (NPG) modified
                      gold electrode is investigated to study the mass transport
                      of ascorbic acid (AA), which oxidation process is
                      characterized by an electrochemical coupled 1st order
                      chemical reaction, commonly termed as EC1 reaction. The
                      template-assisted synthesis of NPG results into the
                      formation of a highly pure and porous film of gold. However,
                      the surface porosity of NPG depends on the choice of
                      electrodeposition parameters, such as deposition time (td)
                      and potential (Ed) and the size of the substrate. Such
                      porosity variation of NPG strongly influences the
                      voltammetric profile of AA anodic reaction, displaying
                      sigmoidal, non-symmetric and symmetric peak features. The
                      analysis of mass transport behaviour of AA reveals a
                      combination of diffusion and thin layer EC1 mechanism,
                      predominance of which is determined by the Ed and td
                      selected for NPG synthesis, as well as the size of the Au
                      substrate. The mass transport of AA on NPG prepared on Au
                      microelectrodes experienced a significant diffusion from
                      bulk solution, owing to the larger pores, which permits the
                      easier exchange of redox species between the NPG volume and
                      the bulk solution. On the contrary, mass transport of AA on
                      NPG deposited on big Au electrode has a significant
                      contribution of thin layer diffusion, attributed to the
                      smaller surface pores of NPG, which limits the exchange of
                      AA and its oxidized form from the bulk solution.},
      cin          = {IEK-9},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IEK-9-20110218},
      pnm          = {1232 - Power-based Fuels and Chemicals (POF4-123)},
      pid          = {G:(DE-HGF)POF4-1232},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000926279600001},
      doi          = {10.1016/j.jelechem.2023.117186},
      url          = {https://juser.fz-juelich.de/record/943384},
}