Due to the unique features including well-defined void space and high surface-to-volume ratio, non-noble metal catalysts with hollow structures have received intensive researches in dye-sensitized solar cells (DSSCs) and electrochemical water splitting. Herein, we prepare a series of cobalt-incorporated molybdenum sulfide hollow nanoboxes (denoted as Co-MoS x NBs) via a one-step fleet template conversion from cube-shaped Co-based zeolitic imidazolate framework-67 which precipitated without prolonged aged process. During above transformation, it is notable that the surface morphologies of nanobox can be effectively tailored by the proportion of MoS 4 2− . The as-obtained Co-MoS x NBs with well-defined boxed structure and the appropriate doped ratio are developed as bifunctional catalysts for accelerating both reduction of I 3 − in DSSCs and hydrogen evolution reaction (HER). As expected, a high power conversion efficiency (9.64%) is achieved by Co-MoS x -1/3 NBs based DSSC under AM 1.5G irradiation, which is much preceded to that of Pt (8.39%). Meanwhile, the practical utilization of Co-MoS x -1/3 NBs for HER yields a low onset overpotential (35 mV) and a small Tafel slope (61.4 mV decade −1 ) in alkaline medium.
Xiu Yun Gu,Chao Yue Zhang,Jun Di Cheng,Shi Qiang Kang,Kun Wei,Geng Zhi Sun,Xiu Ping Gao,Xiao Jun Pan,Jin Yuan Zhou
To develop highly active catalysts as counter electrodes is another promising way for improving the photovoltaic conversion efficiency (PCE) of fibrous dye-sensitized solar cells (FDSSCs). Then considering their applications in wearable electronic system, the designed fibrous counter electrodes (FCEs) should possess a good mechanical flexibility except high catalysis performances. Here in this work, hexagonal nickel telluride (Ni 3 Te 2 ) microsheets with tunable diameters and thicknesses were in-situ prepared via an atmospheric pressure chemical vapor deposition method on nickel wires. Benefiting from their two-dimensional laminated structure and asymmetric crystalline structure, the Ni 3 Te 2 microsheets show a high catalytic activity for the reduction of I 3 - → I - during the photoelectrochemical processes in FDSSCs. And cell tests show that the maximum PCE of FDSSCs with Ni 3 Te 2 FCEs reaches 11.81% (with an average value of 10.47%), which is 2.10 times that of the ones with Pt FCEs (5.62%). Furthermore, series of optimization on the microscale morphologies of Ni 3 Te 2 microsheets indicates that the suitable diameter (30 ∼ 40 μm) and thickness (ca. 3.0 μm) are suitable for the diffusion and reduction of I 3 - ions. Besides, the FDDSCs with Ni 3 Te 2 PCEs show a high cycling stability and an excellent dynamic bending stability (attenuation rate of 0.12‰ per bending cycle). This research would provide some insights into the design of high-performance FCEs for FDSSCs towards wearable electronic devices.
危险品化学品经营许可证（带存储）