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@ARTICLE{Lee:884301,
      author       = {Lee, Minoh and Ding, Xinyu and BANERJEE, SWARNENDU and
                      Krause, Florian and Smirnov, Vladimir and Astakhov,
                      Oleksandr and Merdzhanova, Tsvetelina and Klingebiel,
                      Benjamin and Kirchartz, Thomas and Finger, Friedhelm and
                      Rau, Uwe and Haas, Stefan},
      title        = {{B}ifunctional {C}o{F}e{VO}$_x$ {C}atalyst for {S}olar
                      {W}ater {S}plitting by using {M}ultijunction and
                      {H}eterojunction {S}ilicon {S}olar {C}ells},
      journal      = {Advanced materials technologies},
      volume       = {5},
      number       = {12},
      issn         = {2365-709X},
      address      = {Weinheim},
      publisher    = {Wiley},
      reportid     = {FZJ-2020-03187},
      pages        = {2000592},
      year         = {2020},
      abstract     = {Photovoltaic driven electrochemical (PV-EC) water splitting
                      technology is considered as one of the solutions for an
                      environmental-friendly hydrogen supply. In a PV-EC system,
                      efficient catalysts are required to increase the rate of
                      both oxygen evolution reaction (OER) and hydrogen evolution
                      reaction (HER). Here, we present the development of a
                      CoFeVO$_x$ bifunctional catalyst produced by a simple
                      electrodeposition method. We have found that after the water
                      splitting reaction vanadium is almost completely depleted in
                      the mixture of elements for OER while its concentration at
                      the HER catalyst is similar or even higher after the
                      reaction. For the OER catalyst the depletion of vanadium
                      might lead to the formation of pores, which could be
                      correlated with the activity enhancement. The developed
                      catalyst is integrated into PV-EC devices, coupled with
                      different types of silicon PV. An average solar to hydrogen
                      efficiency of 13.3 \% (9.6 cm$^2$ PV aperture area) is
                      achieved with a shingled module consisting of three
                      laterally series connected silicon heterojunction solar
                      cells.},
      cin          = {IEK-5},
      ddc          = {600},
      cid          = {I:(DE-Juel1)IEK-5-20101013},
      pnm          = {121 - Solar cells of the next generation (POF3-121)},
      pid          = {G:(DE-HGF)POF3-121},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000588665700001},
      doi          = {10.1002/admt.202000592},
      url          = {https://juser.fz-juelich.de/record/884301},
}