# Two-Dimensional Metal-Organic Frameworks and Their Derivative Electrocatalysts for Water Splitting
## 3 Application of 2D MOFs and Their Derivatives for Water Splitting
### Oxygen Evolution Reaction
This Fe-CoP/C composite drives a current density of 10 mA cm\({}^{-2}\) requiring 290 mV overpotential in 1 M KOH. The added Fe can regulate the electronic structure of CoP and the 2D morphology derived from MOF. The conductive network formed by the carbon substrate can increase the electron transfer efficiency and optimize the sample performance. Table 3 summarizes the OER catalytic properties of the 2D MOFs and their derivatives. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Catalyst Name** & **Type** & **Electrolyte** & \(\eta\)**[mV]** & **Tafel Slope** & **Ref.** \\ \hline
[Cu(2,5-pydc)(H2O)]\({}_{\text{n}}\).2H\({}_{2}\)O NSs & 2D MOFs & 1.0 M KOH & 340 & 70 & [132] \\ NiFe-MOF-74 & 2D MOFs & 1.0 M KOH & 195 & 136 & [156] \\ Ni\({}_{3}\)S\({}_{2}\)@2D Co-MOF/CP & 2D MOFs & 1.0 M KOH & 140 & 90.3 & [133] \\  & & 0.5 M H\({}_{2}\)SO\({}_{4}\) & 52 & 49 & \\
2D CoP/Co-MOF & 2D MOFs derivatives & 1.0 M KOH & 26 & 53 & [157] \\  & & 1.0 M PBS & 106 & 89 & \\ NiCoSe & 2D MOFs derivatives & 1.0 M KOH & 170 & 82.3 & [134] \\ Fe\({}_{2}\)-MoS\({}_{2}\)@COS\({}_{2}\)-MOF & 2D MOFs derivatives & 1.0 M KOH & 92 & 70.4 & [158] \\ FeNi\({}_{3}\)-Fe\({}_{3}\)O\({}_{4}\) NPs/MOF-CNT & 2D MOFs derivatives & 1.0 M KOH & 108 & 96.7 & [182] \\ CCS-NiFeP & 2D MOFs derivatives & 1.0 M KOH & 56 & 38 & [184] \\ Ni/Ni\({}_{3}\)S\({}_{2}\)@CN & 2D MOFs derivatives & 1.0 M KOH & 141 & 91 & \\ Ce-MOF@Pt & 2D MOFs & 0.5 M H\({}_{2}\)SO\({}_{4}\) & 187 & 83 & [185] \\  & & 1.0 M KOH & 208 & 188.1 & [186] \\  & & 1.0 M KOH & 33 & 34 & \\ Pt@CuFe-LDHm & 2D MOFs derivatives & 0.1 M KOH & 47 & 50.2 & [187] \\  & & 1.0 M PBS & 120 & 85.6 & \\ Fe-NiS/MoS\({}_{2}\) & 2D MOFs derivatives & 1.0 M KOH & 120 & 69 & [188] \\ Ni@CoO@CoMOFC & 2D MOFs derivatives & 1.0 M KOH & 138 & 59 & [189] \\ CoNiP/NF & 2D MOFs derivatives & 1.0 M KOH & 147 & 51 & [190] \\ TS-Co\({}_{3}\)O\({}_{4}\)@VS\({}_{2}\) & 2D MOFs derivatives & 0.5 M H\({}_{2}\)SO\({}_{4}\) & 175.2 & 57 & [191] \\ \hline \hline \end{tabular}
\end{table} 
Table 2: 2D MOFs and their derivative electrocatalysts for HER (\(\eta\): overpotential at 10 mA cm\({}^{-2}\), if not specified). \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Catalyst Name** & **Type** & **Electrolyte** & \(\eta\)**[mV]** & **Tafel Slope** & **Ref.** \\ \hline NiFe-MOF-74 & 2D MOFs & 1.0 m KOH & 208 & 54 & [156] \\ NiCoSe & 2D MOFs derivatives & 1.0 M KOH & 278 [20 mA cm\({}^{-2}\)] & 92 & [134] \\ Fe\({}_{2}\)-MoS\({}_{2}\)@COS\({}_{2}\)-MOF & 2D MOFs derivatives & 1.0 M KOH & 211 [20 mA cm\({}^{-2}\)] & 64.5 & [158] \\ NiCo-MOF & 2D MOFs & 1.0 M KOH & 310 & 106.3 & [178] \\
2D MOF-Fe/Co & 2D MOFs & 1.0 M KOH & 238 & 52 & [179] \\ NiFe MOF/NF & 2D MOFs & 1.0 M KOH & 221 & 40 & [180] \\ Te,Cl-NiFe MOF & 2D MOFs derivatives & 1.0 M KOH & 224 [30 mA cm\({}^{-2}\)] & 37.6 & [181] \\ FeNi\({}_{3}\)–Fe\({}_{3}\)O\({}_{4}\) NPs/MOF-CNT & 2D MOFs derivatives & 1.0 M KOH & 234 & 37 & [182] \\ Fe-CoP/C & 2D MOFs derivatives & 1.0 M KOH & 290 & 50 & [183] \\ Ce-MOF@Pt & 2D MOFs & 1.0 M KOH & 340 & 47.9 & [186] \\ Fe-NiS/MoS\({}_{2}\) & 2D MOFs derivatives & 1.0 M KOH & 297 & 54.7 & [188] \\ NiFe-BTC/CCHH/NF & 2D MOFs derivatives & 1.0 M KOH & 270 [50 mA cm\({}^{-2}\)] & / & [192] \\ Ni@CoO@CoMOFC & 2D MOFs derivatives & 1.0 M KOH & 247 & 51 & [189] \\ CoNiP/NF & 2D MOFs derivatives & 1.0 M KOH & 234 & 47 & [190] \\ Ru-NiFeP/NF & 2D MOFs derivatives & 1.0 M KOH & 179 & 44.9 & [193] \\ \hline \hline \end{tabular}
\end{table} 
Table 3: 2D MOFs and their derivative electrocatalysts for OER (\(\eta\): overpotential at 10 mA cm\({}^{-2}\), if not specified). Water splitting encompasses both HER and OER. While most 2D MOF catalysts exhibit excellent performance in OER, their performance in HER tends to be relatively subpar. This underscores the need to develop bifunctional catalysts demonstrating high performance in both HER and OER. A prime example of such a bifunctional catalyst is the NiFe-MOF-74, synthesized by [PERSON] et al. [156] through a one-step hydrothermal method.