台州学院熊贤强团队近日研究了I型异质结光催化：通过ZnIn₂S₄/MnCo₂O_4.5界面电场增强活性。相关论文发表在2025年5月14日出版的《结构化学》杂志上。

通过界面电场（IEF）工程调节I型异质结内的电荷转移路径对于促进光催化析氢、有效促进光生电荷载流子的分离至关重要。研究组在MnCo₂O_4.5纳米棒上原位生长了二维ZnIn₂S₄纳米片，以构建一个类似欧姆的I型ZnIn₂S₄/MnCo₂O_4.5异质结，用于高效的光催化析氢。这种类欧姆电荷转移机制有效地解决了忽略IEF效应的传统I型异质结固有的局限性，特别是通过IEF诱导的电荷分离效率的提高。 

因此，优化的ZnIn₂S₄/MnCo₂O_4.5光催化剂显示出20.9 mmol g⁻¹ h⁻¹的出色光催化析氢速率，是裸ZnIn₂S₄的14.9倍。此外，类欧姆电荷输运行为已通过集成的先进实验表征得到了严格验证，包括原位X射线光电子能谱（XPS）、开尔文探针力显微镜（KPFM）和表面光电压（SPV）测量，这些表征共同为所提出的机制提供了强有力的证据。这项工作为光催化H₂释放的高效类欧姆I型异质结催化剂的设计提供了宝贵的见解。

附：英文原文

Title: Type-I heterojunction photocatalysis: enhanced activity via ZnIn2S4/MnCo2O4.5 interfacial electric fields

Author: anonymous

Issue&Volume: 2025-05-14

Abstract: The modulation of charge transfer pathways within type-I heterojunctions through interfacial electric field (IEF) engineering is of critical importance in promoting photocatalytic hydrogen evolution, effectively facilitating the separation of photogenerated charge carriers. In this study, we performed in-situ growth of two-dimensional ZnIn2S4 nanosheets on MnCo2O4.5 nanorods to construct an ohmic-like type-I ZnIn2S4/MnCo2O4.5 heterojunction for efficient photocatalytic hydrogen evolution. This ohmic-like charge transfer mechanism effectively addresses the intrinsic limitations inherent to conventional type-I heterojunctions neglecting IEF effects, particularly through IEF-induced enhancement of charge separation efficiency. Consequently, the optimized ZnIn2S4/MnCo2O4.5 photocatalyst demonstrates an outstanding photocatalytic hydrogen evolution rate of 20.9 mmol g1 h1, 14.9 times that of the bare ZnIn2S4. Furthermore, the ohmic-like charge transport behavior has been rigorously validated by integrated advanced experimental characterizations, including in-situ X-ray photoelectron spectroscopy (XPS), Kelvin probe force microscopy (KPFM), and surface photovoltage (SPV) measurements, which collectively provide robust evidence for the proposed mechanism. This work offers valuable insights into the design of high-efficient ohmic-like type-I heterojunction catalysts for photocatalytic H2 evolution.

DOI: 10.1016/j.cjsc.2025.100620

Source: https://cjsc.ac.cn/cms/issues/802