Sn Bulk Phase Doping and Surface Modification on Ti 4 O 7 for Oxygen Reduction to Hydrogen Peroxide.

Autor: Sun Y; The School of Chemistry and Chemical Engineering, National Key Laboratory of Power Transmission Equipment Technology, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing City, 400044, P.R. China., Luo Y; The School of Chemistry and Chemical Engineering, National Key Laboratory of Power Transmission Equipment Technology, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing City, 400044, P.R. China., Dai L; The School of Chemistry and Chemical Engineering, National Key Laboratory of Power Transmission Equipment Technology, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing City, 400044, P.R. China., Zheng Y; The School of Chemistry and Chemical Engineering, National Key Laboratory of Power Transmission Equipment Technology, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing City, 400044, P.R. China., Zhang H; The School of Chemistry and Chemical Engineering, National Key Laboratory of Power Transmission Equipment Technology, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing City, 400044, P.R. China.; College of Chemistry and Environmental Science, Inner Mongolia Normal University, Huhehaote, 010022, P. R. China., Wang Y; The School of Chemistry and Chemical Engineering, National Key Laboratory of Power Transmission Equipment Technology, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing City, 400044, P.R. China.; College of Chemistry and Environmental Science, Inner Mongolia Normal University, Huhehaote, 010022, P. R. China.
Jazyk: angličtina
Zdroj: Chemistry (Weinheim an der Bergstrasse, Germany) [Chemistry] 2024 Feb 21; Vol. 30 (11), pp. e202303602. Date of Electronic Publication: 2024 Jan 04.
DOI: 10.1002/chem.202303602
Abstrakt: Developing stable and highly selective two-electron oxygen reduction reaction (2e - ORR) electrocatalysts for producing hydrogen peroxide (H 2 O 2 ) is considered a major challenge to replace the anthraquinone process and achieve a sustainable green economy. Here, we doped Sn into Ti 4 O 7 (D-Sn-Ti 4 O 7 ) by simple polymerization post-calcination method as a high-efficiency 2e - ORR electrocatalyst. In addition, we also applied plain calcination after the grinding method to load Sn on Ti 4 O 7 (L-Sn-Ti 4 O 7 ) as a comparison. However, the performance of L-Sn-Ti 4 O 7 is far inferior to that of the D-Sn-Ti 4 O 7 . D-Sn-Ti 4 O 7 exhibits a starting potential of 0.769 V (versus the reversible hydrogen electrode, RHE) and a high H 2 O 2 selectivity of 95.7 %. Excitingly, the catalyst can maintain a stable current density of 2.43 mA ⋅ cm -2 for 3600 s in our self-made H-type cell, and the cumulative H 2 O 2 production reaches 359.2 mg ⋅ L -1 within 50,000 s at 0.3 V. The performance of D-Sn-Ti 4 O 7 is better than that of the non-noble metal 2e - ORR catalysts reported so far. The doping of Sn not only improves the conductivity but also leads to the lattice distortion of Ti 4 O 7 , further forming more oxygen vacancies and Ti 3+ , which greatly improves its 2e - ORR performance compared with the original Ti 4 O 7 . In contrast, since the Sn on the surface of L-Sn-Ti 4 O 7 displays a synergistic effect with Ti n+ (3≤n≤4) of Ti 4 O 7 , the active center Ti n+ dissociates the O=O bond, making it more inclined to 4e - ORR.
(© 2023 Wiley-VCH GmbH.)
Databáze: MEDLINE
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