Z-Scheme Ba2AgIO6/C3N4 Heterojunction Enabling Efficient Visible-Light Photocatalytic H2O2 Production via Direct One-Step Two-Electron O2 Reduction Reaction

IF 6.1 1区 化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR
Kexin Yang, Zhijia Song, XiaoXiao Fu, Wei Yan, Tao Zhang, Yiwei Hua, Haixin Lin, Qin Kuang, Zhaoxiong Xie
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引用次数: 0

Abstract

The photocatalytic direct one-step two-electron (2e-) oxygen reduction reaction (ORR) holds great potential in efficient H2O2 synthesis. However, it is still a significant challenge to design photocatalysts for achieving high-efficiency H2O2 production via this direct one-step 2e- ORR pathway. To address this, we have constructed a Z-scheme BAIO/C3N4 heterojunction by in situ growing Ba2AgIO6 (BAIO) on the surface of C3N4 nanosheets. Under visible light irradiation, the optimal sample, with a BAIO:C3N4 mass ratio of 1:1.5, exhibited a remarkable H2O2 yield of up to 535.9 μmol g-1 h-1, which is 8.8 times higher than that of pure C3N4. This enhancement is attributed to the improved charge separation and migration efficiency facilitated by the enhanced internal electric field (IEF) in BAIO/C3N4 heterojunction. Furthermore, the heterojunction altered the O2 adsorption configuration to the Yeager-type, promoting a more efficient and selective direct one-step 2e- ORR for H2O2 production. This study highlights the importance of regulating the reaction pathway to enhance photocatalytic H2O2 production activity and offers a new insight for designing highly active photocatalysts.
Z-Scheme Ba2AgIO6/C3N4异质结通过直接一步双电子O2还原反应实现高效的可见光光催化H2O2生产
光催化直接一步双电子(2e-)氧还原反应(ORR)在高效合成H2O2方面具有很大的潜力。然而,设计光催化剂以实现通过直接一步2e- ORR途径高效生产H2O2仍然是一个重大挑战。为了解决这个问题,我们在C3N4纳米片表面原位生长Ba2AgIO6 (BAIO),构建了一个Z-scheme BAIO/C3N4异质结。在可见光照射下,BAIO:C3N4质量比为1:1.5的最佳样品H2O2产率达到535.9 μmol g-1 h-1,是纯C3N4的8.8倍。这种增强是由于增强的内部电场(IEF)促进了BAIO/C3N4异质结中电荷分离和迁移效率的提高。此外,异质结改变了O2吸附构型为yeager型,促进了更有效和选择性的直接一步2e- ORR生产H2O2。该研究强调了调节反应途径对提高光催化H2O2生成活性的重要性,为设计高活性光催化剂提供了新的思路。
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来源期刊
Inorganic Chemistry Frontiers
Inorganic Chemistry Frontiers CHEMISTRY, INORGANIC & NUCLEAR-
CiteScore
10.40
自引率
7.10%
发文量
587
审稿时长
1.2 months
期刊介绍: The international, high quality journal for interdisciplinary research between inorganic chemistry and related subjects
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