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Ultrathin Lanthanum Tantalate Perovskite Nanosheets Modified by Nitrogen Doping for Efficient Photocatalytic Water Splitting
ACS Nano ( IF 15.8 ) Pub Date : 2017-11-07 00:00:00 , DOI: 10.1021/acsnano.7b06131 Meilin Lv 1 , Xiaoqin Sun 1 , Shunhang Wei 1 , Cai Shen 2 , Yongli Mi 1, 3 , Xiaoxiang Xu 1
ACS Nano ( IF 15.8 ) Pub Date : 2017-11-07 00:00:00 , DOI: 10.1021/acsnano.7b06131 Meilin Lv 1 , Xiaoqin Sun 1 , Shunhang Wei 1 , Cai Shen 2 , Yongli Mi 1, 3 , Xiaoxiang Xu 1
Affiliation
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Ultrathin nitrogen-doped perovskite nanosheets LaTa2O6.77N0.15– have been fabricated by exfoliating Dion–Jacobson-type layered perovskite RbLaTa2O6.77N0.15. These nanosheets demonstrate superior photocatalytic activities for water splitting into hydrogen and oxygen and remain active with photon wavelengths as far as 600 nm. Their apparent quantum efficiency under visible-light illumination (λ ≥ 420 nm) approaches 1.29% and 3.27% for photocatalytic hydrogen and oxygen production, being almost 4-fold and 8-fold higher than bulk RbLaTa2O6.77N0.15. Their outstanding performance likely stems from their tiny thickness (single perovskite slab) that essentially removes bulk charge diffusion steps and extends the lifetime of photogenerated charges. Theoretical calculations reveal a peculiar 2D charge transportation phenomenon in RbLaTa2O6.77N0.15; thus, exfoliating RbLaTa2O6.77N0.15 into LaTa2O6.77N0.15– nanosheets has limited impact on charge transportation properties but significantly enhances the surface areas which contributes to more reaction sites.
中文翻译：
氮掺杂改性超钽酸钽酸钙钙钛矿纳米片的高效光催化水分解
超薄氮掺杂钙钛矿纳米片LaTa 2 O 6.77 N 0.15 –是通过剥去Dion–Jacobson型层状钙钛矿RbLaTa 2 O 6.77 N 0.15制成的。这些纳米片表现出优异的光催化活性，可将水分解为氢和氧，并在高达600 nm的光子波长下保持活性。在可见光照射下（λ≥420 nm），其光催化制氢和制氧的表观量子效率分别接近1.29％和3.27％，比本体RbLaTa 2 O 6.77 N 0.15高出近4倍和8倍。。它们出色的性能可能源于其微小的厚度（单个钙钛矿板），该厚度基本上消除了电荷扩散的步骤，并延长了光生电荷的寿命。理论计算揭示了RbLaTa 2 O 6.77 N 0.15中特有的二维电荷迁移现象; 因此，将RbLaTa 2 O 6.77 N 0.15剥落到LaTa 2 O 6.77 N 0.15 –纳米片中对电荷传输性能的影响有限，但会显着增加表面积，从而有助于更多的反应位点。
更新日期：2017-11-08
中文翻译：
氮掺杂改性超钽酸钽酸钙钙钛矿纳米片的高效光催化水分解
超薄氮掺杂钙钛矿纳米片LaTa 2 O 6.77 N 0.15 –是通过剥去Dion–Jacobson型层状钙钛矿RbLaTa 2 O 6.77 N 0.15制成的。这些纳米片表现出优异的光催化活性，可将水分解为氢和氧，并在高达600 nm的光子波长下保持活性。在可见光照射下（λ≥420 nm），其光催化制氢和制氧的表观量子效率分别接近1.29％和3.27％，比本体RbLaTa 2 O 6.77 N 0.15高出近4倍和8倍。。它们出色的性能可能源于其微小的厚度（单个钙钛矿板），该厚度基本上消除了电荷扩散的步骤，并延长了光生电荷的寿命。理论计算揭示了RbLaTa 2 O 6.77 N 0.15中特有的二维电荷迁移现象; 因此，将RbLaTa 2 O 6.77 N 0.15剥落到LaTa 2 O 6.77 N 0.15 –纳米片中对电荷传输性能的影响有限，但会显着增加表面积，从而有助于更多的反应位点。
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