Amorphous Fe2O3 for photocatalytic hydrogen evolution†,Catalysis Science & Technology

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Amorphous Fe2O3 for photocatalytic hydrogen evolution†
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2019-09-03 , DOI: 10.1039/c9cy01621j
Zhaoyong Lin _{1,

2,

3,

4,

5} , Chun Du _{1,

2,

3,

4,

5} , Bo Yan _{1,

2,

3,

4,

5} , Guowei Yang _{1,

2,

3,

4,

5}

Affiliation

Fe₂O₃ has drawn significant attention in photocatalysis due to its natural abundance, thermodynamic stability, environmental compatibility, low toxicity and narrow bandgap. Here, for the first time, we demonstrate that amorphous Fe₂O₃ nanoparticles can act as efficient and robust photocatalysts for solar H₂ evolution without any cocatalysts. We also establish a plausible mechanism involving the amorphization-induced thermodynamic and dynamic behaviors of amorphous Fe₂O₃ upon photocatalytic hydrogen evolution. Thermodynamically, amorphization provides more surface states and larger carrier density, and thus elevates the conduction band edge to go across the H₂ evolution potential level. Dynamically, amorphization-induced crystal field splitting weakening delocalizes the photogenerated carriers, and thus overcomes the excitation-wavelength-dependent small polaron trapping effect. These findings imply that amorphization may be a promising approach to functionalize and tailor other photocatalysts.

中文翻译：

非晶态Fe ₂ O ₃用于光催化制氢†

Fe ₂ O ₃由于其自然丰度，热力学稳定性，环境相容性，低毒性和窄带隙而在光催化领域引起了极大的关注。在这里，我们首次证明了无定形的Fe ₂ O ₃纳米粒子可以在没有任何助催化剂的情况下充当太阳能H ₂释放的有效而强大的光催化剂。我们还建立了一个可行的机制，涉及非晶态Fe ₂ O ₃的非晶化诱导的热力学和动力学行为。在光催化氢放出时。在热力学上，非晶化提供了更多的表面状态和更大的载流子密度，从而提高了导带的边缘以跨越H ₂演化势能级。在动态上，非晶化引起的晶体分裂弱化使光生载流子离域，从而克服了依赖于激发波长的小极化子俘获效应。这些发现暗示非晶化可能是功能化和定制其他光催化剂的有前途的方法。

更新日期：2019-10-14

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