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Nat-HEC

Understanding Carbon-neutral Hydrogen Production by Nature’s Hydrogen Evolution Catalyst
Funder: European CommissionProject code: 897555 Call for proposal: H2020-MSCA-IF-2019
Funded under: H2020 | MSCA-IF-EF-ST Overall Budget: 191,852 EURFunder Contribution: 191,852 EUR
Description

The European Union targets a climate-neutral economy by 2050. In the context of this initiative, hydrogen gas (H2) is regarded as a promising energy carrier; however, about 95% of the H2 industrially consumed originates from steam reformation of fossil resources and is associated with significant CO2 release. High-efficiency H2 catalysts based on rare elements like platinum are not affordable on a larger scale. To address the global need for green energy, catalysts composed of earth abundant elements are desirable. Natures’ Hydrogen Evolution Catalyst is the enzyme [FeFe]-hydrogenase. It catalyses H2 production with high rates (10 kHz), in aqueous solution (pH 7), and at low over potentials (-420 mV vs. SHE). [FeFe]-hydrogenase inspired the design of numerous synthetic catalysts, none of which could rival the efficiency of the native system. Basic research is necessary to understand hydrogenase catalysis, in particular regarding the metal hydride chemistry prior H2 release. The objective of this action is to investigate the fundamental hydride chemistry of [FeFe]-hydrogenases under turnover conditions. Catalysis will be initiated via a laser pulse and monitored by transient absorption spectroscopy. Such pump/probe experiments allow following reaction intermediates with sub-turnover time resolution. The results of this action will inspire a targeted design of synthetic catalyst based on earth abundant elements. Moreover, the developed methodology will facilitate a detailed investigation of related enzymes, catalysing global key processes in nature like N2 or CO2 fixation.

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