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Infrequent 3-D Iodocuprate Decorated and Templated by a 1-D Eu Coordination Polymer for the Hydrogen Evolution
Xian Guo1, Xing Liu1, Jian Zhou1
1Chongqing Key Laboratory of Inorganic Functional Materials, College of Chemistry and Materials Science, Chongqing Normal University, Chongqing 401331, P. R. China.
Abstract:
The exploration of novel high-dimensional lanthanide iodocuprates with outstanding catalytic property for the hydrogen evolution reaction (HER) remains challenging. Here, a special europium iodocuprate [Eu(ina)3Cu7I7]n (EuCuI-1, Hina = 5-(imidazol-1-yl)nicotinic acid) was synthesized by the hydrothermal method. EuCuI-1 contains an hitherto unknown three-dimensional (3-D) inorganic [Cu7I7]n open framework with gear-wheel channels filled by one-dimensional (1-D) [Eu(ina)3]n polymers via Cu-N bond interactions, which provides the first example of a high-dimensional iodocuprate with an in situ 1-D Eu coordination polymer as the template and decorating group. EuCuI-1 is used to fabricate the electrode NiFe/EuCuI-1/NF (NiFe = Ni-Fe alloy nanoparticle and NF = porous nickel foam), indicating excellent HER catalytic activity with an ultralow overpotential of 87 mV at 10 mA cm-2. This work offers a promising inspiration for preparing a new class of high-dimensional lanthanide iodocuprates with high-efficiency catalytic HER performance.
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