2019
DOI: 10.1002/ange.201906081
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Core–Shell‐Structured LaTaON2 Transformed from LaKNaTaO5 Plates for Enhanced Photocatalytic H2 Evolution

Abstract: LaTaON2 is a photocatalyst with intense visible light absorption up to 650 nm, but exhibits low H2 evolution activity owing to uncontrolled facets and high defect densities. In this work, core–shell‐structured plate‐like LaKNaTaO5/LaTaON2 was synthesized by nitriding a layered perovskite‐type LaKNaTaO5. The volatilization of K and Na species during the nitridation promoted the rapid transformation of LaKNaTaO5 into LaTaON2 along [010] direction with the plate‐like shape retained. This yielded high‐quality LaTa… Show more

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Cited by 8 publications
(2 citation statements)
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“…The XPS results show that the valence states of the composition elements are consistent with the formula K­(I)­Cu­(II)­Ta­(V) 3 O­(II) 9 . By using a Gaussian fitting method, high-resolution K 2p can be fitted and displayed in Figure e, the peaks located at 291.8 and 294.6 eV are attributed to K 2p 3/2 and K 2p 1/2 , respectively. , For Cu 2p XPS spectra (Figure f), two peaks assigned to Cu 2p 3/2 and Cu 2p 1/2 of Cu 2+ species are observed with two shakeup satellites (indicated as “Sat.”) peaks located at higher binding energy, proving that the Cu 2+ state in both the KCTO and KCTO@C-10. , Ta 4f XPS spectra of KCTO and KCTO@C-10 (Figure g) show that there are two peaks at 25.4 and 27.3 eV, which correspond to the binding energies of Ta 4f 7/2 and Ta 4f 5/2 of Ta 5+ species, respectively. , Clearly, no obvious reduced tantalum species (Ta 4+ or Ta 3+ ) can be observed, which is beneficial to improve the photocatalytic activity due to the fact that these reduced tantalum species act as deep trapping sites or recombination centers for the photogenerated electron–hole pairs. As shown in Figure h, for both the KCTO and KCTO@C-10 samples, the O 1s state involves three overlapping peaks centered at 529.7, 531.1, and 532.5 eV, which are assignable to Ta–O, C–O, and −OH bonds, respectively. , The relatively higher intensity of the C–O bond in KCTO@C-10 indicates the formation of carbon species on the surface of KCTO. The high-resolution C 1s spectra of KCTO and KCTO@C-10 are displayed in Figure i.…”
Section: Resultsmentioning
confidence: 89%
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“…The XPS results show that the valence states of the composition elements are consistent with the formula K­(I)­Cu­(II)­Ta­(V) 3 O­(II) 9 . By using a Gaussian fitting method, high-resolution K 2p can be fitted and displayed in Figure e, the peaks located at 291.8 and 294.6 eV are attributed to K 2p 3/2 and K 2p 1/2 , respectively. , For Cu 2p XPS spectra (Figure f), two peaks assigned to Cu 2p 3/2 and Cu 2p 1/2 of Cu 2+ species are observed with two shakeup satellites (indicated as “Sat.”) peaks located at higher binding energy, proving that the Cu 2+ state in both the KCTO and KCTO@C-10. , Ta 4f XPS spectra of KCTO and KCTO@C-10 (Figure g) show that there are two peaks at 25.4 and 27.3 eV, which correspond to the binding energies of Ta 4f 7/2 and Ta 4f 5/2 of Ta 5+ species, respectively. , Clearly, no obvious reduced tantalum species (Ta 4+ or Ta 3+ ) can be observed, which is beneficial to improve the photocatalytic activity due to the fact that these reduced tantalum species act as deep trapping sites or recombination centers for the photogenerated electron–hole pairs. As shown in Figure h, for both the KCTO and KCTO@C-10 samples, the O 1s state involves three overlapping peaks centered at 529.7, 531.1, and 532.5 eV, which are assignable to Ta–O, C–O, and −OH bonds, respectively. , The relatively higher intensity of the C–O bond in KCTO@C-10 indicates the formation of carbon species on the surface of KCTO. The high-resolution C 1s spectra of KCTO and KCTO@C-10 are displayed in Figure i.…”
Section: Resultsmentioning
confidence: 89%
“…44,45 Ta 4f XPS spectra of KCTO and KCTO@ C-10 (Figure 2g) show that there are two peaks at 25.4 and 27.3 eV, which correspond to the binding energies of Ta 4f 7/2 and Ta 4f 5/2 of Ta 5+ species, respectively. 46,47 Clearly, no obvious reduced tantalum species (Ta 4+ or Ta 3+ ) can be observed, which is beneficial to improve the photocatalytic activity due to the fact that these reduced tantalum species act as deep trapping sites or recombination centers for the photogenerated electron−hole pairs. 48−50 As shown in Figure 2h, for both the KCTO and KCTO@C-10 samples, the O 1s state involves three overlapping peaks centered at 529.7, 531.1, and 532.5 eV, which are assignable to Ta−O, C−O, and −OH bonds, respectively.…”
Section: Structure Composition and Property Analysesmentioning
confidence: 99%