用于高效光催化整体水分离的界面 B-O 键调制 S 型 B 掺杂缺 N C3N4/O 掺杂 C3N5

IF 9.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Chinese Chemical Letters Pub Date : 2024-07-20 DOI:10.1016/j.cclet.2024.110288

Entian Cui , Yulian Lu , Zhaoxia Li , Zhilei Chen , Chengyan Ge , Jizhou Jiang

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引用次数: 0

摘要

光催化整体纯水分离是一种在温和条件下产生绿色氢能的可行方法。然而，这一过程往往受到电子-空穴分离和传输迟缓的阻碍。为解决这一问题，我们构建了一种具有 B-O 键界面的阶梯式（S-scheme）B-掺杂缺 N C3N4/O 掺杂 C3N5（BN-C3N4/O-C3N5）异质结。利用铂和 Co(OH)2 作为助催化剂，BN-C3N4/O-C3N5 S 型异质结在可见光条件下的整体纯水分离光催化活性显著增强，H2 和 O2 的进化速率分别达到 40.12 和 19.62 µmol/h。系统表征和实验揭示了增强的内置电场和界面 B-O 键的性能增强效应。首先，增强的内置电场为快速的界面电子传输提供了足够的力。其次，通过降低传输能垒和传输距离，界面 B-O 键有利于氧化还原电势相对较低的电子和空穴通过 S 型电荷转移途径快速重组，从而使高电位的电子和空穴可用于 H+ 还原和 OH- 氧化反应。总体而言，BN-C3N4/O-C3N5 S-scheme异质结的光催化效率显著提高，使其成为一种通过整体纯水分离实现绿色制氢的可行方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Interfacial B-O bonding modulated S-scheme B-doped N-deficient C3N4/O-doped-C3N5 for efficient photocatalytic overall water splitting

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Interfacial B-O bonding modulated S-scheme B-doped N-deficient C3N4/O-doped-C3N5 for efficient photocatalytic overall water splitting

Photocatalytic overall pure water splitting is a promising method for generating green hydrogen energy under mild conditions. However, this process is often hindered by sluggish electron-hole separation and transport. To address this, a step-scheme (S-scheme) B-doped N-deficient C₃N₄/O-doped C₃N₅ (BN-C₃N₄/O-C₃N₅) heterojunction with interfacial B-O bonds has been constructed. Utilizing Pt and Co(OH)₂ as co-catalysts, BN-C₃N₄/O-C₃N₅ S-scheme heterojunction demonstrates significantly enhanced photocatalytic activity for overall pure water splitting under visible light, achieving H₂ and O₂ evolution rates of 40.12 and 19.62 µmol/h, respectively. Systematic characterizations and experiments revealed the performance-enhancing effects of the enhanced built-in electric field and the interfacial B-O bonding. Firstly, the strengthened built-in electric field provides sufficient force for rapid interfacial electron transport. Secondly, by reducing the transport energy barrier and transfer distance, the interfacial B-O bonds facilitate rapid recombination of electrons and holes with relatively low redox potential via the S-scheme charge-transfer route, leaving the high-potential electrons and holes available for H⁺ reduction and OH⁻ oxidation reactions. Overall, the photocatalytic efficiency of BN-C₃N₄/O-C₃N₅ S-scheme heterojunction was significantly improved, making it a promising approach for green hydrogen production through overall pure water splitting.

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来源期刊

Chinese Chemical Letters 化学-化学综合

CiteScore

14.10

自引率

15.40%

发文量

8969

审稿时长

1.6 months

期刊介绍： Chinese Chemical Letters (CCL) (ISSN 1001-8417) was founded in July 1990. The journal publishes preliminary accounts in the whole field of chemistry, including inorganic chemistry, organic chemistry, analytical chemistry, physical chemistry, polymer chemistry, applied chemistry, etc.Chinese Chemical Letters does not accept articles previously published or scheduled to be published. To verify originality, your article may be checked by the originality detection service CrossCheck.