Highly Porous MIL-100(Fe) for the Hydrogen Evolution Reaction (HER) in Acidic and Basic Media

Ravi Nivetha; Kannan Gothandapani; Vimala Raghavan; George Jacob; Raja Sellappan; Preetam Bhardwaj; Sudhagar Pitchaimuthu; Arunachala Nadar Mada Kannan; Soon Kwan Jeong; Andrews Nirmala Grace

doi:10.1021/acsomega.0c02171

Highly Porous MIL-100(Fe) for the Hydrogen Evolution Reaction (HER) in Acidic and Basic Media

ACS Omega. 2020 Jul 21;5(30):18941-18949. doi: 10.1021/acsomega.0c02171. eCollection 2020 Aug 4.

Affiliations

¹ Centre for Nanotechnology Research, VIT University, Vellore 632014, India.
² Photocatalyst and Coatings Group, SPECIFIC, College of Engineering, Swansea University (Bay Campus), Fabian Way, Swansea SA1 8EN,U.K.
³ Ira A. Fulton Schools of Engineering, Arizona State University, Mesa, Arizona 85212, United States.
⁴ Climate Change Technology Research Division, Korea Institute of Energy Research, Yuseong-gu, Daejeon 305-343, South Korea.

Abstract

The present study reports the synthesis of a porous Fe-based MOF named MIL-100(Fe) by a modified hydrothermal method without the HF process. The synthesis gave a high surface area with the specific surface area calculated to be 2551 m² g^-1 and a pore volume of 1.407 cm³ g^-1 with an average pore size of 1.103 nm. The synthesized electrocatalyst having a high surface area is demonstrated as an excellent electrocatalyst for the hydrogen evolution reaction investigated in both acidic and alkaline media. As desired, the electrochemical results showed low Tafel slopes (53.59 and 56.65 mV dec^-1), high exchange current densities (76.44 and 72.75 mA cm^-2), low overpotentials (148.29 and 150.57 mV), and long-term stability in both media, respectively. The high activity is ascribed to the large surface area of the synthesized Fe-based metal-organic framework with porous nature.