基于虚拟仪器的光电化学测试系统研制

AN INVESTIGATION OF PHOTOELECTROCHEMICAL MEASUREMENT SYSTEM BASED ON VIRTUAL INSTRUMENT

成功建立了基于虚拟仪器的光电化学测试系统。该系统利用高压短弧氙灯作为全波谱光源,通过光栅单色仪获得单色光照射光电极,使用锁相放大技术在恒电位仪控制电势的条件下对光电极进行光电化学转化效率(Incident Photon-to-Current Efficiency,IPCE)测试。采用Labview编制的软件对系统进行控制,利用通用接口总线(GeneralPurpose Interface Bus,GPIB)和串口对系统进行控制和数据采集,并作进一步的数据分析。

Based on virtual instrument an automated photocurrent spectroscopy system was constructed for photoelectrochemical application. In the system a high-pressure short arc Xe lamp was used to provide full spectrum illumination to a monochromator, which selected a single wavelength to illuminate the photoelectrode. Lock-in technology was used to detect the photocurrent and Incident Photon-to-Current efficiency （IPCE） under the potential controlled condition. A program was developed to control the system, which the general purpose interface bus （GPIB） and the serial port were used to communicated with the potentiostat, the lock-in amplifier and the monochromator respectively. The whole system was automated, stable and reliable. It was very useful for photoelectrochemical water splitting study, by using it the IPCE action spectrum can be obtained easily.