先进的框架修饰的POM @ ZIF-67纳米复合材料，可增强析氧反应电催化剂,Journal of Materials Chemistry A

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先进的框架修饰的POM @ ZIF-67纳米复合材料，可增强析氧反应电催化剂
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-06-18 , DOI: 10.1039/d0ta03898a
Víctor K. Abdelkader-Fernández _{1,

2,

3,

4,

5} , Diana M. Fernandes _{1,

2,

3,

4,

5} , Salete S. Balula _{1,

2,

3,

4,

5} , Luís Cunha-Silva _{1,

2,

3,

4,

5} , Cristina Freire _{1,

2,

3,

4,

5}

Affiliation

含钴的多金属氧酸盐（POM）和基于钴的沸石咪唑骨架（ZIF-67）的智能组装是一种有前途的工具，可用于生产用于氧释放反应（OER）的活性电催化剂。通过“原位”合成将SiW ₁₁ Co封装在ZIF-67腔内，产生了两种新型的POM @ ZIF-67纳米复合材料，具有低和高的POM负载-SiW ₁₁ Co @ ZIF-67和SiW ₁₁ Co [h] @ ZIF- 67。其他涉及类似的三取代硅钨酸盐的材料，SiW ₉ Co ₃ @ ZIF-67和SiW ₉ Co ₃[h] @ ZIF-67，出于比较原因而准备。无论POM的取代程度如何，我们证明对于已报道的材料SiW ₉ Co ₃ @ ZIF-67发现的双向协同POM-ZIF-67相互作用适用于其他首次制备的纳米复合材料。值得注意的是，在两个高POM负载样品的情况下，这种协同作用得到了根本增强，这些纳米结构材料是非常活泼的OER电催化剂，相对于150到160 mV的过电势降低，动力学更快（塔菲尔斜率降低了约35％）。原始的ZIF-67。而且，它们显示出固有的OER活性高于昂贵的商业参考文献（RuO ₂和IrO ₂粉末），特别是在SiW ₉ Co ₃ [h] @ ZIF-67的情况下。这种重要的电催化改进可能与所获得的更高的POM负载量有关，也与在这些纳米材料中包裹“标准” ZIF-67骨架的富含缺陷的开放相形成有关。

"点击查看英文标题和摘要"

Advanced framework-modified POM@ZIF-67 nanocomposites as enhanced oxygen evolution reaction electrocatalysts

The smart assembly of Co-containing polyoxometalates (POMs) and Co-based zeolitic imidazole frameworks (ZIF-67) is a promising tool to produce active electrocatalysts for the oxygen evolution reaction (OER). The encapsulation of SiW₁₁Co inside ZIF-67 cavities via ‘in situ’ synthesis produced two novel POM@ZIF-67 nanocomposites with low and high POM loadings—SiW₁₁Co@ZIF-67 and SiW₁₁Co[h]@ZIF-67, respectively. Other materials involving the analogue tri-substituted silicotungstate, SiW₉Co₃@ZIF-67 and SiW₉Co₃[h]@ZIF-67, have been prepared for comparison reasons. Regardless of the POM substitution degree, we demonstrated that the bidirectional synergistic POM-ZIF-67 interaction found for the already reported material, SiW₉Co₃@ZIF-67, is applicable to the other first-time prepared nanocomposites. Remarkably, this synergy is radically enhanced in the case of the two high POM loading samples, with these nanostructured materials being very active OER electrocatalysts, exhibiting 150–160 mV decreased overpotentials and much faster kinetics (∼35% decreased Tafel slopes) in relation to pristine ZIF-67. Moreover, they reveal intrinsic OER activities higher than those developed by the expensive commercial references (RuO₂ and IrO₂ powders) especially in the case of SiW₉Co₃[h]@ZIF-67. This important electrocatalytic improvement can be related to the higher POM loadings achieved, as well as to the formation of an open defect-enriched phase wrapping the ‘standard’ ZIF-67 framework in these nanomaterials.

更新日期：2020-07-14

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