High Surface Area Proton Relaying Metal Organic Framework Scaffold for Efficient Hydrogen Evolution Reaction

Omar Farha^a, Joseph Hupp^a, Idan Hod^a

^aDepartment of Chemistry, Northwestern University, United States, Sheridan Road, 2145, Evanston, United States

Proceedings of International Conference on New Advances in Materials Research for Solar Fuels Production (SolarFuel14)

Montréal, Canada, 2014 June 25th - 26th

Organizer: Thomas Hamann

Oral, Idan Hod, presentation 028
Publication date: 16th April 2014

A great deal of scientific effort is currently being invested in the development of efficient electrocatalytic hydrogen evolution technologies, as they hold promise for future carbon-free energy economy. The hydrogen evolution reaction (HER), is achieved by the electrochemical reduction of water and facilitates the need for a catalyst that would reduce the amount of overpotential invested during the process. The use of noble metals electrocatalysts such as Pt for HER enables the production of high cathodic currents under low overpotentials. However, realization of large scale hydrogen production requires the development of alternative low-cost highly abundant electrocatalysts.
In this work, we present a new efficient and robust high surface area electrocatalytic HER system composed of a scaffold made out of a Zr-based Metal Organic Framework (MOF) loaded with electrochemically deposited nickel sulfide catalyst (termed MOF-NiS_x). The MOF scaffold holds two main functionalities: first, it increases the effective surface area of nickel sulfide catalyst compared to a flat system. Second, it conducts protons through its porous channels to the surface of the catalyst. In aqueous pH 1 solutions, the MOF-NiS_x system exhibits significantly higher electrocatalytic activities than a flat NiSx fabricated by the same procedure, while presenting an overpotential of 249 mV to produce cathodic currents of 10 mA/cm².

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