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@ARTICLE{Jung:636467,
      author       = {Jung, Hayoon and Cha, Gihoon and Kim, Hyesung and Will,
                      Johannes and Zhou, Xin and Bad'ura, Zdeněk and Zoppellaro,
                      Giorgio and Dobrota, Ana S. and Skorodumova, Natalia V. and
                      Pašti, Igor A. and Sarma, Bidyut Bikash and Schmidt, Jochen
                      and Spiecker, Erdmann and Breu, Josef and Schmuki, Patrik},
      title        = {{C}ation {V}acancies in {T}i‐{D}eficient {T}i{O}$_2$
                      {N}anosheets {E}nable {H}ighly {S}table {T}rapping of {P}t
                      {S}ingle {A}toms for {P}ersistent {P}hotocatalytic
                      {H}ydrogen {E}volution},
      journal      = {Small},
      volume       = {21},
      number       = {29},
      issn         = {1613-6810},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {PUBDB-2025-03681},
      pages        = {2502428},
      year         = {2025},
      abstract     = {The stabilization of single-atom catalysts on semiconductor
                      substrates is pivotal for advancing photocatalysis. TiO$_2$,
                      a widely employed photocatalyst, typically stabilizes single
                      atoms at oxygen vacancies—sites that are accessible but
                      prone to agglomeration under illumination. Here, we
                      demonstrate that cation vacancies in Ti-deficient TiO$_2$
                      nanosheets provide highly stable anchoring sites for Pt
                      single atoms, enabling persistent photocatalytic hydrogen
                      evolution. Ultrathin TiO$_2$ nanosheets with intrinsic
                      Ti$^{4+}$ vacancies are synthesized via lepidocrocite-type
                      titanate delamination and Pt single atoms are selectively
                      trapped within these vacancies through a simple immersion
                      process. The resulting Pt-decorated nanosheets exhibit
                      superior photocatalytic hydrogen evolution performance,
                      outperforming both Pt nanoparticle-loaded nanosheets and
                      benchmarked Pt single-atom catalysts on P25. Crucially, Pt
                      atoms anchored at Ti$^{4+}$ vacancies display remarkable
                      resistance to light-induced agglomeration, a key limitation
                      of conventional single-atom photocatalysts. Density
                      functional theory calculations reveal that Pt incorporation
                      into Ti$^{4+}$ vacancies is highly thermodynamically
                      favorable and optimizes hydrogen adsorption energetics for
                      enhanced catalytic activity. This work highlights the
                      critical role of cation defect engineering in stabilizing
                      single-atom co-catalysts and advancing the efficiency and
                      durability of photocatalytic hydrogen evolution.},
      cin          = {DOOR ; HAS-User},
      ddc          = {620},
      cid          = {I:(DE-H253)HAS-User-20120731},
      pnm          = {6G3 - PETRA III (DESY) (POF4-6G3) / DFG project
                      G:(GEPRIS)431791331 - SFB 1452: Katalyse an flüssigen
                      Grenzflächen (CLINT) (431791331) / SAN4Fuel - Single atom
                      based nanohybrid photocatalyts for green fuels (101079384)},
      pid          = {G:(DE-HGF)POF4-6G3 / G:(GEPRIS)431791331 /
                      G:(EU-Grant)101079384},
      experiment   = {EXP:(DE-H253)P-P65-20150101},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1002/smll.202502428},
      url          = {https://bib-pubdb1.desy.de/record/636467},
}