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New J. Chem.┃Congratulations to Luo-Han Xie and Dr. Fentahun Wondu Dagnaw for their paper published on New J. Chem.!
New J. Chem.┃Congratulations to Luo-Han Xie and Dr. Fentahun Wondu Dagnaw for their paper published on New J. Chem.!
发布时间：2023-06-20
Abstract:Silicon (Si) is a commercially available semiconductor for photoelectrochemical hydrogen production with advantages of its abundance, low environmental hazard, wide range of solar energy absorption spectrum, high current density and industrial applicability. However, it suffers from surface light reflection, short carrier transport distance, slow charge transfer kinetics at the electrode-electrolyte interface, and poor stability in aqueous electrolytes, resulting in decreased photocurrent density and elevated over potential. In this work, surface modified nanoporous Si photocathode, called black Si (b-Si), is fabricated with large electrochemical surface area to loading of Co(dmgH)2(py)Cl molecular catalyst for efficient PEC H2 generation. Under the illumination of simulated solar, the optimal b-Si/[Co] photocathode exhibits a high photocurrent density of -4.15 mA cm-2 (0 VRHE), which is 319 times higher than that of the f-Si electrode under the same conditions. Moreover, the onset potential positively shifts to 0.31 V and the driving force required for H2 production is significantly decreased. The enhanced PEC water splitting performance is owing to the rapid charge-transfer across electrode-electrolyte interface and the efficient reactivity via HER molecular catalyst. The surface engineering of nanoporous structure and the deposition of molecular catalyst on Si electrode bring insights into the construction of semiconductor/catalyst hybrid photoelectrodes, which can synchronously improve the HER at the electrode/electrolyte interface, reduce the over-potential, and speedup the progress of photoelectrochemical water splitting.
Xie, L.-H.†; Dagnaw, F. W.†; Yao, M.-M.; Chen, Y.-J.; Chen, J.; Jian, J.-X.*; Tong, Q.-X.*, Nanoporous Silicon Photocathodes with [Co] Molecular Catalyst for Enhanced Solar-Driven Hydrogen Generation. New J. Chem. 2023, doi:10.1039/D3NJ02691D.
链接：http://dx.doi.org/10.1039/D3NJ02691D