4.8 Article

A Novel Multinary Intermetallic as an Active Electrocatalyst for Hydrogen Evolution

Journal

ADVANCED MATERIALS
Volume 32, Issue 21, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202000385

Keywords

electrocatalysis; high-entropy intermetallics; metallurgy; site isolation; synergistic functions

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Electrochemical water splitting offers an attractive approach for hydrogen production. However, the lack of high-performance cost-effective electrocatalyst severely hinders its applications. Here, a multinary high-entropy intermetallic (HEI) that possesses an unusual periodically ordered structure containing multiple non-noble elements is reported, which can serve as a highly efficient electrocatalyst for hydrogen evolution. This HEI exhibits excellent activities in alkalinity with an overpotential of 88.2 mV at a current density of 10 mA cm(-2) and a Tafel slope of 40.1 mV dec(-1), which are comparable to those of noble catalysts. Theoretical calculations reveal that the chemical complexity and surprising atomic configurations provide a strong synergistic function to alter the electronic structure. Furthermore, the unique L1(2)-type ordered structure enables a specific site-isolation effect to further stabilize the H2O/H* adsorption/desorption, which dramatically optimizes the energy barrier of hydrogen evolution. Such an HEI strategy uncovers a new paradigm to develop novel electrocatalyst with superior reaction activities.

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