Table 1 Comparison of catalytic parameters of different HER catalysts.

From: Local atomic structure modulations activate metal oxide as electrocatalyst for hydrogen evolution in acidic water

Catalyst

Current density ( j , mA cm−2)

Corresponding overpotential ( η , mV)

Tafel slope (mV per decade)

Exchange current density ( j0, mA cm−2)*

WO3

10

−637

120

5.0 × 10−5

WO2.9

10

−70

50

0.40

Pt/C†

10

−31

30

0.93

  1. HER, hydrogen evolution reaction; RHE, reversible hydrogen electrode.
  2. *j0 was calculated from Tafel curves using extrapolation method.
  3. †Johnson–Matthey, 20 wt% Pt/XC-72.
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