Quantitative summary of system calibration.

Electrochemical research has been developing with the advancement of laboratory equipment and sophisticated technologies. One of which is the portable potentiostat, which has been utilized to analyze various samples and help characterize their electrochemical properties. In this paper, we propose a comprehensive design and modular analysis of our proposed potentiostat called GaneStat. The proposed potentiostat has a low cost, portable, and high accuracy with battery-powered and electrical overstress circuit protection. The proposed analog front end of the potentiostat consists of several modules such as unipolar-to-bipolar converter (UBC), buffer, current-to-voltage converter (CVC), bipolar-to-unipolar converter (BUC), two-stage sallen key low-pass filter, and ADC input protection unit (AIPC). A maximum wide dynamic range of 98.95 dB provides flexibility in terms of current measurement. The potentiostat is also equipped with a dedicated power management circuit and an overstress protection circuit. Multi mode measurements are provided in our system for Cyclic voltammetry (CV), differential pulse voltammetry (DPV), Linear Sweep Voltammetry (LSV), and Chronoamperometry (CA) experiments with preliminary test on redox probe solution to validate the performance of the device. The final design occupies relatively small space of 6.95cm × 6.85 cm × 3.26 cm with 83.1 gr of weight, including the battery and the case. The potentiostat operates with sweep voltage within ±2.5 V with a 1.2 mV resolution, and it can measure current from 10 nA to 10 mA with 0.53 nA and 0.3 μA resolutions, respectively. The potentiostat costs only $98.55 for the prototyping. This work is useful for laboratory applications in chemical, pharmacy and medical industries.

电化学研究依托实验室设备与前沿技术的进步持续推进。其中便携式恒电位仪（portable potentiostat）便是其一，被广泛用于各类样品的分析与电化学特性表征。本文针对我们所提出的一款名为GaneStat的恒电位仪，展开了系统化设计与模块化分析。该恒电位仪具备低成本、便携性与高精度特性，搭载电池供电电路与过电应力保护机制。本恒电位仪所采用的模拟前端（analog front end）包含多个功能模块：单极性转双极性转换器（unipolar-to-bipolar converter, UBC）、缓冲器、电流-电压转换器（current-to-voltage converter, CVC）、双极性转单极性转换器（bipolar-to-unipolar converter, BUC）、两级萨伦-凯低通滤波器（two-stage Sallen-Key low-pass filter）以及ADC输入保护单元（ADC input protection unit, AIPC）。其最大动态范围可达98.95 dB，为电流测量提供了充足的灵活性。该恒电位仪还搭载了专用电源管理电路与过应力保护电路。本系统支持多种电化学测试模式，涵盖循环伏安法（cyclic voltammetry, CV）、差分脉冲伏安法（differential pulse voltammetry, DPV）、线性扫描伏安法（linear sweep voltammetry, LSV）以及计时电流法（chronoamperometry, CA），并通过氧化还原探针溶液的预实验验证了设备的性能。最终设计的整机尺寸仅为6.95 cm × 6.85 cm × 3.26 cm，重量约83.1克（含电池与外壳）。该恒电位仪的扫描电压范围为±2.5 V，分辨率达1.2 mV；电流测量范围覆盖10 nA至10 mA，对应分辨率分别为0.53 nA与0.3 μA。该设备的原型样机制造成本仅为98.55美元。本研究成果可应用于化学、制药与医疗行业的实验室场景。