期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 32, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202204407
关键词
Carbon Nitride; Coordination Bonds; Interfacial Engineering; Photoanode; Water Splitting
资金
- Australian Research Council
- Australian Government Research Training Program (RTP) Scholarship
Constructing an intimate film/substrate interface is crucial for achieving efficient photoelectrochemical performance. Inspired by coordination chemistry, a polymeric carbon nitride film is grown on a Ti-coated substrate, leading to reduced interfacial resistance and ultralow onset potential. The PCN photoanode exhibits good photocurrent density and stability for water splitting without external bias.
Construction of an intimate film/substrate interface is of great importance for a photoelectrode to achieve efficient photoelectrochemical performance. Inspired by coordination chemistry, a polymeric carbon nitride (PCN) film is intimately grown on a Ti-coated substrate by an in situ thermal condensation process. The as-prepared PCN photoanode exhibits a record low onset potential (E-onset) of -0.38 V versus the reversible hydrogen electrode (RHE) and a decent photocurrent density of 242 mu A cm(-2) at 1.23 V-RHE for water splitting. Detailed characterization confirms that the origin of the ultralow onset potential is mainly attributed to the substantially reduced interfacial resistance between the Ti-coated substrate and the PCN film benefitting from the constructed interfacial sp(2) N -> Ti coordination bonds. For the first time, the ultralow onset potential enables the PCN photoanode to drive water splitting without external bias with a stable photocurrent density of approximate to 9 mu A cm(-2) up to 1 hour.
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