PEMFC Electrocatalyst Activity Analyzer

Hupd background subtraction · ECSA · ORR mass/specific activity · Offline calculation

Test Standard

Based on GB/T 20042.4-2025. Methods are compatible with US DOE and EU JRC/IEC protocols (Hupd ECSA, K-L kinetic current, q = 0.21 mC/cm²).

Electrochemical Surface Area (ECSA · Hupd Method)

Scan Rate

Pt Monolayer Charge q_spec

RDE Geometric Area (cm²)

Ink Concentration (mg/mL)

Drop Volume (µL)

Pt Weight Fraction (%)

30% 50%

→ Pt Loading (µg/cm²)

Advanced Integration Settings

Hupd Lower Limit (V)

Hupd Upper Limit (V)

Baseline Subtraction Mode

Manual Baseline Current Density (mA/cm²) Manual mode only

Potential

Current

CV Data (two columns: potential, current; space/comma/tab separated)

PNG transparent background (applies to CV & LSV exports)

Hupd plot X-axis range (V): Min Max

S_H (mA·V/cm²)—

Q_H (mC/cm²)—

ECSA (m²/g_Pt)—

ECSA (cm²)—

Roughness Factor RF—

ORR Mass Activity / Specific Activity

Current Density j @ E (mA/cm²)

Limiting Current j_lim (mA/cm²)

Evaluation Potential E (V vs RHE)

Manual j_lim Evaluation Potential (V)

LSV Data (O₂ + N₂ Background)

O₂ Potential

O₂ Current

N₂ Current

O₂ LSV

N₂ Background

Y-axis range (mA/cm²): Min Max

Kinetic Current j_k (mA/cm²)—

Mass Activity MA (A/mg_Pt)—

Specific Activity SA (mA/cm²_Pt)—

Results Summary

ECSA	MA	SA
—m²/g_Pt	—A/mg_Pt	—mA/cm²_Pt

Figure contents · 导出图内容

ECSA–CV LSV Hupd integration panel · 积分区间图 Results table · 数据汇总 Shading and markers · 阴影与标记

Layout · 排版

Select only the panels you need. Shading and markers affect PNG exports, not calculations. · 仅导出勾选内容；阴影与标记选项仅影响图片，不改变计算。

Analysis Workbench · 自动 QC / 多样品比较

Capture the current CV/O₂/N₂ inputs, or import sample JSON files. Each capture is a snapshot; recapture after changing inputs. Analysis uses cathodic currents and a continuous diffusion plateau. Missing results are shown as —.

Sample name · 样品名称

Input potential reference

pH (25 °C)

Additional uncompensated Ru (Ω)

RHE conversion and E − I·Ru apply only to captured workbench data. Use Ru = 0 if already corrected. Hupd bounds above are interpreted in V vs RHE here. Original manual calculators remain available.

Minimum plateau width (V)

Plateau slope / amplitude (V⁻¹)

Tafel lower bound (V RHE)

Tafel upper bound (V RHE)

History is saved in this browser. Back up JSON before moving the HTML or clearing browser data. · 历史保存在当前浏览器；移动 HTML 或清理浏览器前请备份 JSON。

Import one or more sample JSON files (see README schema)

CV comparison · CV 比较 LSV comparison · LSV 比较

Checked samples appear in plots and analysis exports; history backup includes all samples. · 勾选样品用于绘图和分析导出；历史备份包含全部样品。

Multi-rpm Koutecký–Levich · 多转速拟合

Paste/import CSV: rpm,potential_V_RHE,j_mA_cm2. Supply a single corrected ORR sweep per rpm, at least three distinct speeds. Values must already be in V vs RHE and mA/cm²; no background or potential correction is applied here.

Import one or more multi-rpm CSV files

Fit potential (V RHE)

O₂ diffusion D (cm²/s), optional

Kinematic viscosity ν (cm²/s)

O₂ concentration C (mol/cm³)