期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 17, 页码 20185-20193出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c03620
关键词
photoelectrocatalysis; coating strategy; necking layer; transition-metal phosphide
资金
- National Natural Science Foundation of China [51672174, 51772190, 51779139, 21875137]
The methodology of coating electrocatalysts on semiconductor substrates is critical for the catalytic performance of photoelectrochemical electrodes. The formation of a TiO2 necking layer between catalyst particles and substrates plays a key role in ensuring surface catalytic activity and durability. This coating strategy provides a practical approach to meet commercial requirements for low-cost, highly efficient, and durable photoelectrodes.
The methodology of coating electrocatalysts on semiconductor substrates is critical for the catalytic performance of photoelectrochemical electrodes. A weakly bound coating leads to orders of magnitude lower efficiency and reliability compared to those required to meet the commercial demand. Herein, a facile strategy based on the hydrolysis of TiCl4 is developed to solve the coating issue. Mesoporous tungsten phosphide (WP) particles were spin-coated and affixed onto TiO2-protected planar p-Si by the formation of a TiO2 necking layer between the catalyst particles and the substrates. Under 1 sun illumination, the as-prepared WP/TiO2/Si photocathode yields a saturated current density of -35 mA cm(-2) and a durability of over 110 h with a current density over -15 mA cm(-2) at 0 V versus a reversible hydrogen electrode in a 1.0 M KOH solution, which is among the state-of-the-art performances of commercial planar Si-based photocathodes. The Kelvin probe force microscopy results suggest the successive transfer of photoelectrons from Si to TiO2 and WP. The as-formed TiO2 necking layer plays the key role in ensuring the surface catalytic activity and durability. This necking strategy is also applicable for coating other transition-metal phosphides, for example, MoP and FeP, thus offering a practical approach to meet the commercial requirement of low-cost, highly efficient, and durable photoelectrodes.
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