· 논문명 : Highly Immobilized Bimetallic Fe/M-N4 (M- Mg or Zn) Conductive Metal–Organic Frameworks on Nitrogen- 

               Doped Porous Carbon for Efficient Electrocatalytic Hydrogen Evolution and Oxygen Reduction Reactions

· 저     자 : Ravi Nivetha, Mahdieh Razi Asrami, Rajeev Kumar, Sushant Sharma, Milad Jourshabani, Rajaiah Dhilip Kumar,

                  Santhosh Ravichandran,Byeong–Kyu Lee, Youngil Lee, Jin Suk Chung, Sung Gu Kang, Won Mook Choi, Seung Hyun Hur*

· 게재지 : Small Structures (2024, 5, 2300355)

· 초록

Recently, the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) have received great attention for the development

Herein, a simple method is proposed for developing bimetallic Fe/M-N4/ nitrogen-doped porous carbon (NPC) (M-Zn or Mg) conductive

metal–organic framework (c-MOF) composites because of their great potential in replacing conventional catalysts. The prepared 

composite MOF exhibits remarkable catalytic activity for both hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR), 

surpassing the  performance of the state-of-the-art transition metal-N4 cathode catalysts. These composites demonstrate excellent 

selectivity for a four-electron transfer, facilitated by an associative reaction pathway that functions as the rate-determining step. 

Therefore, they offer high half-wave and onset potential values for ORR, i.e., 0.92 and 1.02 V for Fe/Mg-N4-NPC (hexaminobenzene

(HAB)-3@NPC) at a current density of 4.11 mA cm-2, and 0.89 and 0.99 V for Fe/Zn-N4-NPC (HAB-2@NPC) at a current density of 

3.8 mA cm-2, respectively. In addition, they provide low overpotentials of 21 and 64 mV at the current density of 10 mA cm-2 with Tafel 

slopes of 47.9 and 34.2 mV dec-1for HER, respectively. Furthermore, when utilized as the cathode in bifunctional electrode assembly 

cells, they provide low  cell voltages of 1.412 V at a current density of 20mA cm-2. In the membrane electrode assembly, the HAB-

3@NPC composite demonstrates an optimal power density of 0.861 Wcm-2, thus underscoring its potential in practical applications.