Broadband photodetectors with self-driven functions have attracted intensive scientific interest due to their low energy consumption and high optical gain. However, high-performance broadband self-driven photodetectors are still a significant challenge due to the complex fabrication processes, environmental toxicity, high production costs of traditional 3D semiconductor materials and sharply raised contact resistance, severe interfacial recombination of 2D materials and 2D/3D mixed dimension heterojunction. Here, 1D p-Te/2D n-Bi₂Te₃ heterojunctions are constructed by the simple and low-cost hydrothermal method. 1D p-Te/2D n-Bi₂Te₃ devices are applied in photoelectrochemical (PEC) photodetectors, with their high performance attributed to the good interfacial contacts reducing interface recombination. The device demonstrated a broad wavelength range (365–850 nm) with an/_ph//_dark as high as 377.45. The R_iD*, and external quantum efficiency (EQE) values of the device were as high as 12.07 mA/W, 5.87 × 10¹⁰ Jones, and 41.05%, respectively, which were significantly better than the performance of the prepared Bi₂Te₃ and Te devices. A comparison of the freshly fabricated device and the device after 30 days showed that 1D p-Te/2D n-Bi₂Te₃ had excellent stability with only 18.08% decay of photocurrent. It is anticipated that this work will provide new emerging material for future design and preparation of a high-performance self-driven broadband photodetector.

The efficiency of photocatalytic hydrogen evolution is currently limited by poor light adsorption, rapid recombination of photogenerated carriers, and ineffective surface reaction rate. Although heterojunctions with innovative morphologies and structures can strengthen built‐in electric fields and maximize the separation of photogenerated charges. However, how to rational design of novel multidimensional structures to simultaneously improve the above three bottleneck problems is still a research imperative. Herein, a unique Cu ₂ O─S@graphene oxide (GO)@Zn _0.67 Cd _0.33 S Three dimensional (3D) hollow heterostructure is designed and synthesized, which greatly extends the carrier lifetime and effectively promotes the separation of photogenerated charges. The H ₂ production rate reached 48.5 mmol g ⁻¹ h ⁻¹ under visible light after loading Ni ²⁺ on the heterojunction surface, which is 97 times higher than that of pure Zn _0.67 Cd _0.33 S nanospheres. Furthermore, the H ₂ production rate can reach 77.3 mmol g ⁻¹ h ⁻¹ without cooling, verifying the effectiveness of the photothermal effect. Meanwhile, in situ characterization and density flooding theory calculations reveal the efficient charge transfer at the p‐n 3D hollow heterojunction interface. This study not only reveals the detailed mechanism of photocatalytic hydrogen evolution in depth but also rationalizes the construction of superior 3D hollow heterojunctions, thus providing a universal strategy for the materials‐by‐design of high‐performance heterojunctions.

Hydrogen energy is a high-efficiency and clean energy, but the problem of storage still prevents its extensive use. Large-surface-area, two-dimensional (2D) layered materials have an advantage in hydrogen storage applications. Monolayer MoS₂ is a typical 2D material that has been widely studied recently. And the 1T′ phase of MoS₂ is a focus especially for studies concerning hydrogen. Here, first-principles calculations are carried out to investigate the adsorption behaviors of hydrogen molecules on 1T′ MoS₂. Comparing with other MoS₂-based materials, such as doped or decorated 2H-MoS₂, 1T′ MoS₂ has even better performance in hydrogen adsorption, and its preparation is easier. In multiple hydrogen molecule adsorption, the material shows good stability and appropriate adsorption energy while adsorbing hydrogen molecules. With the researches in this paper, the connection between the adsorption energy and hydrogen mass fraction was set up. This can provide a reference for further studies on hydrogen storage applications.