Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 118, Issue 24, Pages 12625-12631Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp501797e
Keywords
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Funding
- National Natural Science Foundation of China [21303039]
- Natural Science Foundation of Hebei Province [B2013205171, B2012205034]
- Support Program for Hundred Excellent Innovation Talents from the Universities of Hebei Province [BR2-220]
- Scientific Research Foundation for Introduction of Talents of Hebei Normal University
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Vanadium nitride (VN) peas and cubes were synthesized by regulating the molar ratio of the starting materials (urea/VOCl3) via the urea-metal chloride route. The as-prepared VN compounds were subsequently introduced into dye-sensitized solar cells (DSCs) as counter electrode (CE) catalysts for the regeneration of novel organic thiolate/disulfide (T-/T-2) and traditional iodide/triiodide (I-/I-3(-))redox couples. The cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization curve results proved that the catalytic activity of the prepared VN was significantly affected by particle shape and particle size. The VN peas showed the highest catalytic activity, followed by the small VN cubes and large VN cubes. The I-/I-3(-)-electrolyte-based DSCs yielded a high power conversion efficiency (PCE) of 7.29%. The Pt-free VN CE catalysts are more suitable for the new organic redox couples of T-/T-2. The DSCs based on VN peas CE showed a PCE of 5.57%, an enhancement of 40.7% relative to the Pt-CE-based DSCs (3.96%).
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