A single-channel potentiostat is judged by its specifications. A multichannel electrochemical workstation for photoelectrochemical work is judged by something else: whether channel one and channel eight behave identically, and whether the software lets you actually run eight experiments a day instead of two.
Between-channel matching matters more than per-channel excellence when your science is comparison, catalyst screens, parallel devices, aging studies. Ask for the data behind the marketing: matching specifications for current ranges, bias accuracy and rise time across channels. Verify with a standard cell on every channel at acceptance.
Current resolution down to nanoamps for small photoelectrodes; adequate compliance voltage for high-resistance electrolytes; low-noise front ends, light-chopping experiments live and die by bandwidth and noise; and floating or grounded options depending on your cell grounding scheme.
With many channels, the bottleneck becomes setup and data handling: queued experiment sequences, per-channel parameter templates, synchronous start for comparable runs, and export formats that flow into your analysis stack. A workstation that requires hand-tending each channel wastes the parallel hardware.
Channel count with headroom; consistency data; noise floor demonstrated on real PEC signals (chopped light), not resistors; queuing and automation; and support for the light-source integration you plan. Price last, after the science fits.
See Perfectlight's electrochemical workstations and solutions for multichannel configurations.
