Comparison of reported OER overpotentials of selected intermetallic catalysts at a given current densities in alkaline, acidic and neutral mediaa.
| Catalyst (substrate) | Electrolyte | Current density (mA cm−2) | Overpotential (mV) | Tafel slope (mV dec−1) | Reference |
|---|---|---|---|---|---|
| FeAs (NF) | 1 M KOH | 10 | 252 | 32 | 149 |
| FeSn2 (NF) | 1 M KOH | 10 | 197 | 33 | 102 |
| CoSn2 (NF) | 1 M KOH | 10 | 230 | — | 221 |
| CoSn2 (FTO) | 1 M KOH | 10 | 299 | 89 | 221 |
| np-AlNiCoIrMo HEA (GC) | 0.5 M H2SO4 | 10 | 233 | 55.2 | 100 |
| NiIrRuAl-1/3 (GC) | 0.1 M HClO4 | 10 | 237 | 50 | 164 |
| Fe6Ge5 (FTO) | 1 M KOH | 10 | 322 | — | 98 |
| Fe6Ge5 (NF) | 1 M KOH | 10 | 228 | 56 | 98 |
| NiGe (FTO) | 1 M KOH | 10 | 322 | — | 105 |
| NiGe (NF) | 1 M KOH | 10 | 228 | 56 | 105 |
| Porous MoNi4 networks (Ni) | 1 M KOH | 10 | 280 | 79 | 131 |
| Co3Mo (direct) | 1 M KOH | 164 | 350 | 82 | 113 |
| FeNi3@NC (GC) | 1 M KOH | 10 | 277 | 77 | 225 |
| FeNi3/NC (GC) | 0.1 M KOH | 10 | 450 | 141 | 103 |
| Fe-enriched FeNi3/NC (GC) | 0.1 M KOH | 10 | 360 | 82 | 103 |
| MnGa4 (NF) | 1 M KOH | 10 | 293 | 98 | 97 |
| Co/SiOC (GC) | 0.1 M KOH | 10 | 440 | 118 | 223 |
| Ni/SiOC (GC) | 0.1 M KOH | 10 | 390 | 90 | 223 |
| NiSi (GC) | 0.1 M KOH | 10 | 570 | 119 | 224 |
| Ni2Si (GC) | 0.1 M KOH | 10 | 570 | 94 | 224 |
| Ni2Ta (direct) | 0.5 M H2SO4 | 10 | 570 | — | 110 |
| Co2Ta (direct) | 0.5 M H2SO4 | 10 | 600 | — | 110 |
| Fe2Ta (direct) | 0.5 M H2SO4 | 10 | 770 | — | 110 |
| IrNi-RF (GC) | 0.1 M HClO4 | 10 | 313.6 | 48.6 | 120 |
| FeSi (direct) | 1.6 M H2SO4 | 10 | 1107 | 634 | 90 |
| Fe5Si3 (direct) | 1.6 M H2SO4 | 10 | 1072 | 327 | 90 |
| Fe3Si (direct) | 1.6 M H2SO4 | 10 | 955 | 253 | 90 |
| PtCo-1 (GC) | 1 M KOH | 10 | 380 | 71.2 | 167 |
| PtCo-3 (GC) | 1 M KOH | 10 | 386 | 65.9 | 167 |
| IrRu@Te (GC) | 0.5 M H2SO4 | 10 | 220 | 35 | 132 |
| IrRu@Te (GC) | 0.05 M H2SO4 | 10 | 245 | — | 132 |
| IrRu@Te (GC) | PBS | 10 | 309 | — | 132 |
| Al2Pt (direct) | 0.1 M HClO4 | 10 | 450 | — | 108 |
| AlNi3 (Si) | 1 M KOH | 10 | 300 | 46 | 219 |
| AlNi3/Al3Ni5 (Si) | 1 M KOH | 10 | 390 | 52 | 219 |
| AlNi (Si) | 1 M KOH | 10 | 310 | 47 | 219 |
| Ni3Al N-0 (direct) | 1 M KOH | 10 | 320 | 112 | 95 |
| Ni3Al N-1160 (direct) | 1 M KOH | 10 | 280 | 73 | 95 |
| Ni3Al N-1200 (direct) | 1 M KOH | 10 | 293 | 85 | 95 |
| Ni3Al N-1240 (direct) | 1 M KOH | 10 | 300 | 103 | 95 |
| Ni3Al N-1280 (direct) | 1 M KOH | 10 | 305 | 108 | 95 |
| Ni2/3Fe1/3Al (direct) | 1 M KOH | 10 | 299 | 58.9 | 169 |
| Co3InC0.7N0.3 (GC) | 1 M KOH | 10 | 350 | 76 | 229 |
| CuNNi3+Cu (GC) | 1 M KOH | 10 | 510 | 163 | 99 |
| CuNNi3 (GC) | 1 M KOH | 10 | 480 | 136 | 99 |
| Cu1−xNNi3−y/FeNiCu (GC) | 1 M KOH | 10 | 300 | 76 | 99 |
| p-Cu1−xNNi3−y/FeNiCu (GC) | 1 M KOH | 10 | 280 | 52 | 99 |
| NiZn (GC) | 1 M KOH | 10 | 283 | 73 | 226 |
| CusSn@Cu (Cu) | 1 M KOH | 50 | 384 | 177 | 232 |
| NiSn10 (Ni) | 1 M NaOH | 40 | 541 | 60 | 227 |
| NiSn60 (Ni) | 1 M NaOH | 40 | 516 | 63 | 227 |
| NiSn100 (Ni) | 1 M NaOH | 40 | 473 | 57 | 227 |
| FeCoNiCrNb0.5 (direct) | 0.1 M KOH | 10 | 288 | 27.67 | 101 |
| AlNiHT10 + L (Ni) | 1 M KOH | 100 | 338 | — | 160 |
a
FTO = fluorine doped tin oxide, GC = glassy carbon, NF = nickel foam.