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@ARTICLE{Rosser:885516,
      author       = {Rosser, Timothy E. and Sousa, Juliana P. S. and Ziouani,
                      Yasmine and Bondarchuk, Oleksandr and Petrovykh, Dmitri Y.
                      and Wei, Xian-Kui and Humphrey, Jo J. L. and Heggen, Marc
                      and Kolen'ko, Yury V. and Wain, Andrew J.},
      title        = {{E}nhanced oxygen evolution catalysis by aluminium-doped
                      cobalt phosphide through in situ surface area increase},
      journal      = {Catalysis science $\&$ technology},
      volume       = {10},
      number       = {8},
      issn         = {2044-4761},
      address      = {London},
      publisher    = {RSC Publ.},
      reportid     = {FZJ-2020-03896},
      pages        = {2398 - 2406},
      year         = {2020},
      abstract     = {The deployment of water electrolysis as a major contributor
                      to global hydrogen production requires the elimination of
                      catalysts based on scarce and expensive precious metals, and
                      amongst the most promising alternatives are first-row
                      transition metal phosphides. This study presents the
                      synthesis, characterisation, electrochemical testing and
                      performance rationalisation of cobalt phosphide modified
                      with aluminium as an improved catalyst for alkaline oxygen
                      evolution. The electrodes were prepared by gas phase
                      phosphorisation of Al-sputtered Co foam, and characterised
                      by SEM, EDX, XRD, XPS, HAADF-STEM and Raman spectroscopy. Al
                      modification enhances the oxygen evolution performance of
                      the anodes, with a current density of 200 mA cm−2 reached
                      at an overpotential of 360 mV, representing a 50 mV
                      improvement compared to the Al-free sample. Double layer
                      capacitance measurements indicate that the performance
                      enhancement results from an approximately four-fold increase
                      in relative electrochemically active surface area (ECSA) in
                      the Al-modified sample. In situ Raman spectroscopy
                      rationalises this ECSA increase on the grounds of an
                      Al-induced preference for a spinel phase Co/Al oxide on the
                      catalyst surface upon exposure to electrolyte solution, the
                      compact crystal structure of which causes shrinkage and
                      surface cracking. This contrasts with previous observations
                      on Al-doped nickel phosphides, where an increase in surface
                      area was attributed to Al dissolution. These results present
                      a route for achieving high current density oxygen evolution
                      without the need to alter the catalyst active species, as
                      well as demonstrate the importance of in situ techniques for
                      rationalising performance improvements resulting from subtle
                      differences in surface chemistry.},
      cin          = {ER-C-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)ER-C-1-20170209},
      pnm          = {143 - Controlling Configuration-Based Phenomena (POF3-143)
                      / CritCat - Towards Replacement of Critical Catalyst
                      Materials by Improved Nanoparticle Control and Rational
                      Design (686053)},
      pid          = {G:(DE-HGF)POF3-143 / G:(EU-Grant)686053},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000530288800006},
      doi          = {10.1039/D0CY00123F},
      url          = {https://juser.fz-juelich.de/record/885516},
}