Ferroelectric polarization in Bi0.9Dy0.1FeO3/g-C3N4 Z-scheme heterojunction boosts photocatalytic hydrogen evolution

IF 6.8 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Science China Materials Pub Date : 2024-08-07 DOI:10.1007/s40843-024-3036-y

Qifu Yao (, ), Ping Liu (, ), Fei Yang (, ), Yilin Zhu (, ), Yagang Pan (, ), Hongtao Xue (, ), Weiwei Mao (, ), Liang Chu (, )

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Abstract

Delivering excellent carrier separation through ferroelectric polarization is desirable to achieve effective solar hydrogen conversion. Here, Bi_0.9Dy_0.1FeO₃/g-C₃N₄ (BDFO/GCN) Z-scheme photocatalyst was constructed by loading BDFO nanoparticles onto sheet-like GCN, in which BiFeO₃ (BFO) was doped with the rare-earth element Dy to narrow the optical bandgap and enhance the ferroelectric property. Residual polarization effectively promoted the separation and transport of photo-generated carriers in BFO, and the Z-scheme exhibited stable reaction activity during photocatalytic degradation and photocatalytic hydrogen evolution. Through electric polarization, the heterojunction photocatalyst achieves 100% degradation of Rhodamine B (RhB) under simulated sunlight. The evolution rate of hydrogen was improved from approximately 742.5 to 1084.0 µmol·g⁻¹·h⁻¹ after polarization. This remarkable activity is attributed to the improved carrier separation facilitated by the internal polarization field. This work offers novel insights into the rational design of efficient ferroelectric photocatalysts.

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Bi0.9Dy0.1FeO3/g-C3N4 Z 型异质结中的铁电极化促进光催化氢气进化

通过铁电极化实现出色的载流子分离是实现有效太阳能氢转化的理想选择。本文通过在片状 GCN 上负载 BDFO 纳米颗粒，构建了 Bi0.9Dy0.1FeO3/g-C3N4 (BDFO/GCN) Z 型光催化剂，其中 BiFeO3 (BFO) 掺杂了稀土元素 Dy 以缩小光带隙并增强铁电性质。残余极化有效地促进了光生载流子在 BFO 中的分离和传输，Z 型结构在光催化降解和光催化氢气进化过程中表现出稳定的反应活性。通过电极化，异质结光催化剂在模拟阳光下实现了对罗丹明 B（RhB）的 100% 降解。极化后，氢的进化率从约 742.5 µmol-g-1-h-1 提高到 1084.0 µmol-g-1-h-1。这一显著的活性归功于内部极化场促进了载流子分离。这项工作为合理设计高效铁电光催化剂提供了新的见解。

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来源期刊

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.