ZIF-8-derived carbon-thin-layer protected WC/W24O68 micro-sized rods with enriched oxygen vacancies as efficient Pt co-catalysts for methanol oxidation and oxygen reduction

ZIF-8-derived carbon-thin-layer protected WC/W24O68 micro-sized rods with enriched oxygen vacancies as efficient Pt co-catalysts for methanol oxidation and oxygen reduction
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ZIF-8衍生的具有富氧空位的碳薄层保护WC/W24O68微米棒作为甲醇氧化和氧还原的高效Pt助催化剂

DOI:
10.1016/j.apcatb.2019.118574
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发表时间:
2020-05
期刊:
Applied Catalysis B: Environmental
影响因子:
--
通讯作者:
Zou Jinlong
Zou Jinlong
中科院分区:
其他
文献类型:
--
作者:
Li Jiahuan;You Shijie;Liu Mingyang;Zhang Peng;Dai Ying;Yu Yang;Ren Nanqi;Zou Jinlong

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为了使甲醇氧化反应(MOR)和氧还原反应(ORR)更加高效,有必要探索具有理想助催化活性的Pt载体(低Pt负载量)。在此,制备碳化钨/氧化钨/沸石咪唑酯骨架8(ZIF-8)衍生的碳((WC)/W24O68/NCZ8)复合材料作为Pt载体/助催化剂。控制加热温度以调整(WC)/W24O68/NCZ8的结构和晶相。对于MOR,Pt-WC/W24O68/NCZ8(850°C,5.0wt.%)的质量活性(2492.2mA mg−1Pt)远优于商业Pt/C(499.2mA mg−1Pt,10.0wt.%)。 NCZ8 薄层有利于 W 原子(W24O68 到 WC)的渗碳,形成 WC/W24O68 异质结。 W24O68 上的氧空位吸引 H+ 促进钨青铜化合物 (HyWO3, (0<y<1)) 的形成,W24O68 和 Hy(WO)3(0<y<1) 之间的可逆反应有助于提高 MOR 活性和 CO 耐受性。 Pt-WC/W24O68/NCZ8(850°C) 在酸性介质中也表现出比 Pt/C 更高的 ORR 活性 (4e-)。 WC/W24O68 异质结可加速 ORR 混合晶体界面处的质量和电荷转移。
To make methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR) more efficient, it is essential to explore Pt support (low Pt-loading) with desirable co-catalytic activity. Herein, tungsten carbide/tungsten oxide/zeolitic imidazolate framework-8 (ZIF-8)-derived carbon ((WC)/W24O68/NCZ8) composites are prepared as Pt-supports/co-catalysts. Heating temperature is controlled to adjust structure and crystalline phases of (WC)/W24O68/NCZ8. For MOR, mass activity (2492.2 mA mg−1Pt) of Pt-WC/W24O68/NCZ8(850 °C, 5.0 wt.%) is much superior to commercial Pt/C (499.2 mA mg−1Pt, 10.0 wt.%). NCZ8-thin-layer facilitates carburization of W atoms (W24O68to WC) to form WC/W24O68heterojunctions. Oxygen vacancies on W24O68fascinate H+to encourage formation of tungsten bronze compounds (HyWO3, (0 < y < 1)), and reversible reaction between W24O68and Hy(WO)3(0 < y < 1) contributes to a high MOR activity and CO resistance. Pt-WC/W24O68/NCZ8(850 °C) also exhibits a higher ORR activity (4e-) than Pt/C in acidic media. WC/W24O68heterojunctions accelerate mass and charge transfer at the mixed crystal interfaces for ORR.
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