MOFs-derived TiO2 on N-doped carbon materials with high concentration of oxygen vacancies as Pt supports and co-catalysts for methanol electrooxidation

IF 4.7 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications Pub Date : 2023-12-15 DOI:10.1016/j.elecom.2023.107648

Yuelei Si , Zhuo Zhang , Yaxiong Ji

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Abstract

MIL-125(Ti)–NH₂ was pyrolyzed in N₂ and H₂/Ar gas to prepare N-doped carbon materials containing TiO₂ (TiO₂-NC). XPS, ESR and Raman spectra analysis showed that higher concentration of oxygen vacancies were created on the surface of TiO₂ in H₂/Ar gas, which provided more anchor sites for the nucleation of Pt and enhanced the interaction between Pt and TiO₂. Therefore, the mass activity/specific activity of Pt/(TiO₂-NC)_HA catalysts for methanol oxidation was 510.7 mA mg⁻¹_Pt/2.84 mA cm⁻²_Pt, which was 3.1/1.4 times that of Pt/(TiO₂-NC)_N catalysts. Due to the enriched OH_ads on the suface of TiO₂ and the strong metal-support interaction between TiO₂ and Pt, Pt/(TiO₂-NC)_HA catalysts exhibited stronger resistance to CO_ads poisoning than commercial JM-Pt/C catalysts, thus showing more excellent catalytic activity and stability.

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在具有高浓度氧空位的掺杂 N 的碳材料上衍生 MOFs 的 TiO2 作为甲醇电氧化的铂支撑和助催化剂

在 N2 和 H2/Ar 气体中热解 MIL-125(Ti)-NH2，制备出含 TiO2 的 N 掺杂碳材料（TiO2-NC）。XPS、ESR和拉曼光谱分析表明，在H2/Ar气体中，TiO2表面产生了更高浓度的氧空位，这为铂的成核提供了更多的锚点，并增强了铂与TiO2之间的相互作用。因此，铂/（TiO2-NC）HA 催化剂氧化甲醇的质量活性/比活度为 510.7 mA mg-1Pt/2.84 mA cm-2Pt，是铂/（TiO2-NC）N 催化剂的 3.1/1.4 倍。由于 TiO2 表面富含 OHads，且 TiO2 与 Pt 之间具有很强的金属支撑作用，Pt/(TiO2-NC)HA 催化剂比商用 JM-Pt/C 催化剂具有更强的抗 COads 中毒能力，从而表现出更优异的催化活性和稳定性。

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来源期刊

Electrochemistry Communications 工程技术-电化学

CiteScore

8.50

自引率

3.70%

发文量

160

审稿时长

1.2 months

期刊介绍： Electrochemistry Communications is an open access journal providing fast dissemination of short communications, full communications and mini reviews covering the whole field of electrochemistry which merit urgent publication. Short communications are limited to a maximum of 20,000 characters (including spaces) while full communications and mini reviews are limited to 25,000 characters (including spaces). Supplementary information is permitted for full communications and mini reviews but not for short communications. We aim to be the fastest journal in electrochemistry for these types of papers.

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