Construction of S-scheme MnCo2S4/nitrogen-vacancy g-C3N4 heterojunction and its photocatalytic performance for hydrogen peroxide production

WANG Xiaoyun; FU Aimin; NIU Jia

doi:10.11949/0438-1157.20260486

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Construction of S-scheme MnCo₂S₄/nitrogen-vacancy g-C₃N₄ heterojunction and its photocatalytic performance for hydrogen peroxide production

更新时间：2026-07-06

- Construction of S-scheme MnCo₂S₄/nitrogen-vacancy g-C₃N₄ heterojunction and its photocatalytic performance for hydrogen peroxide production
- CIESC Journal (2026)
- 作者机构：
  
  1.福建理工大学生态环境与城市建设学院，福建福州 350118
  2.福建宁德核电有限公司，福建宁德 355220
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20260486
  CLC： TQ 034;TB 332;O 643.3
- Received：08 April 2026，
  
  Revised：2026-07-04，
  
  Accepted：06 July 2026，
- 稿件说明：
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WANG Xiaoyun, FU Aimin, NIU Jia. Construction of S-scheme MnCo₂S₄/nitrogen-vacancy g-C₃N₄ heterojunction and its photocatalytic performance for hydrogen peroxide production[J/OL]. CIESC Journal, 2026. DOI: 10.11949/0438-1157.20260486.
DOI：

WANG Xiaoyun, FU Aimin, NIU Jia. Construction of S-scheme MnCo₂S₄/nitrogen-vacancy g-C₃N₄ heterojunction and its photocatalytic performance for hydrogen peroxide production[J/OL]. CIESC Journal, 2026. DOI: 10.11949/0438-1157.20260486. DOI：

摘要

针对纯石墨相氮化碳(g-C

)光生载流子易复合、可见光响应范围窄、活性位点不足等问题，通过热聚合与后热处理制备氮空位g-C

(VCN)，并采用一步水热法原位构筑S型MnCo

/氮空位g-C

(MCS/VCN)异质结光催化剂。利用XRD、FTIR、SEM、TEM、XPS、UPS、光电化学测试等手段，系统分析材料结构、形貌、能带结构与电荷转移动力学，并进一步考察其光催化产过氧化氢(H

)性能。结果表明，氮空位可拓宽可见光响应范围并提供O

活化位点；MCS与VCN形成紧密异质界面，在内建电场与能带弯曲的共同作用下，遵循S型电荷转移机制，实现载流子高效分离并保留强还原能力。最优配比的15%MCS/VCN在模拟太阳光照射下的H

产率可达3.501 mmol·g

-1

·h

-1

，为VCN的8.8倍；420 nm单色光下表观量子效率(AQY)为3.5%，全光谱太阳能化学转化效率(SCC)达0.81%，循环10次后活性保留率为95.6%。自由基捕获与EPR结果证实，15%MCS/VCN光催化产过氧化氢反应以・O

为关键中间体，遵循两步单电子氧还原路径。本研究为缺陷型氮化碳基S型异质结的设计及绿色光催化合成H

提供了新思路与实验依据。

Abstract

To address the shortcomings of pure graphitic carbon nitride (g-C

) such as rapid recombination of photogenerated carriers

narrow visible-light response

and insufficient active sites

nitrogen-va

cancy modified g-C

(VCN) was prepared via thermal polymerization and post-heat treatment. An S-scheme MnCo

/nitrogen-vacancy g-C

(MCS/VCN) heterojunction photocatalyst was then fabricated through a one-step hydrothermal method. The structure

morphology

band structure

and charge transfer dynamics were systematically characterized by XRD

FTIR

SEM

TEM

XPS

UPS

and photoelectrochemical measurements. The photocatalytic H

production performance was also evaluated. The results showed that nitrogen vacancies broaden the visible-light response and provide active sites for O

activation. A tight heterointerfacial contact between MCS and VCN was obtained

and an S-scheme charge transfer mechanism was realized under the synergistic effects of built-in electric field and band bending

which greatly promoted carrier separation and retained strong reduction ability. The optimized 15%MCS/VCN exhibited a superior H

production rate of 3.501 mmol·g

-1

·h

-1

under simulated sunlight irradiation

which was 8.8 times higher than that of VCN. The apparent quantum yield (AQY) at 420 nm reached 3.5%

and the solar-to-chemical conversion efficiency (SCC) was 0.81%. The catalyst maintained 95.6% of its initial activity after 10 cycles. Radical trapping and EPR results confirmed that ·O

was the key intermediate

and the reaction followed a two-step single-electron oxygen reduction pathway. This work provides a new strategy and experimental basis for designing defective g-C

-based S-scheme heterojunctions for green photocatalytic H

production.

关键词

Keywords

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