Scholarlink

<p>Constructing an efficient electron coupling path is essential for enhancing photocatalytic hydrogen evolution. Here, guided by theoretical design and experimental validation, a Graphdiyne/CoBO<sub>x</sub> (GDY/CB) ohmic junction catalyst was developed, enabling highly efficient and directional transfer of photogenerated carriers. Density functional theory (DFT) calculations reveal that interfacial bonding between GDY and CoBO<sub>x</sub> induces strong electronic coupling, suppresses electron backflow, and promotes charge delocalization. Microstructural analyses (SEM/TEM) confirm that the 2D layered GDY framework intimately contacts CoBO<sub>x</sub> nanosheets, forming a “high-speed channel” for electron migration. In situ XPS under illumination directly captures the photoinduced electron transfer from CoBO<sub>x</sub> to GDY, evidencing the establishment of a unidirectional transfer pathway. Photoelectrochemical tests, together with the above characterizations, indicate that interfacial coupling markedly enhances hydrogen evolution by reducing transport resistance and optimizing surface kinetics. The optimized GDY/CB-30% exhibits a hydrogen evolution rate of 9.91 mmol·g<sup>−1</sup>·h<sup>−1</sup>, 7.56 times higher than pristine GDY and superior to most non-noble-metal photocatalysts. This work highlights carbon-based ohmic junctions as a strategy to overcome bandgap limitations through engineered electron transport.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Rational construction of graphdiyne-based ohmic junctions to promote visible-light hydrogen evolution through interfacial charge transfer dynamics

  • 期刊论文

  • 发表日期：

    2026年1月26日

查看全文
  • Mingxia Zheng,
  • YuYu Wang,
  • Jing Xu,
  • Zhiliang Jin

摘要

Constructing an efficient electron coupling path is essential for enhancing photocatalytic hydrogen evolution. Here, guided by theoretical design and experimental validation, a Graphdiyne/CoBOx (GDY/CB) ohmic junction catalyst was developed, enabling highly efficient and directional transfer of photogenerated carriers. Density functional theory (DFT) calculations reveal that interfacial bonding between GDY and CoBOx induces strong electronic coupling, suppresses electron backflow, and promotes charge delocalization. Microstructural analyses (SEM/TEM) confirm that the 2D layered GDY framework intimately contacts CoBOx nanosheets, forming a “high-speed channel” for electron migration. In situ XPS under illumination directly captures the photoinduced electron transfer from CoBOx to GDY, evidencing the establishment of a unidirectional transfer pathway. Photoelectrochemical tests, together with the above characterizations, indicate that interfacial coupling markedly enhances hydrogen evolution by reducing transport resistance and optimizing surface kinetics. The optimized GDY/CB-30% exhibits a hydrogen evolution rate of 9.91 mmol·g−1·h−1, 7.56 times higher than pristine GDY and superior to most non-noble-metal photocatalysts. This work highlights carbon-based ohmic junctions as a strategy to overcome bandgap limitations through engineered electron transport.