Abstract:
:The need for sustainable catalysts for an efficient hydrogen evolution reaction is of significant interest for modern society. Inspired by comparable structural properties of [FeNi]-hydrogenase, here we present the natural ore pentlandite (Fe4.5Ni4.5S8) as a direct 'rock' electrode material for hydrogen evolution under acidic conditions with an overpotential of 280 mV at 10 mA cm(-2). Furthermore, it reaches a value as low as 190 mV after 96 h of electrolysis due to surface sulfur depletion, which may change the electronic structure of the catalytically active nickel-iron centres. The 'rock' material shows an unexpected catalytic activity with comparable overpotential and Tafel slope to some well-developed metallic or nanostructured catalysts. Notably, the 'rock' material offers high current densities (≤650 mA cm(-2)) without any loss in activity for approximately 170 h. The superior hydrogen evolution performance of pentlandites as 'rock' electrode labels this ore as a promising electrocatalyst for future hydrogen-based economy.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Konkena B,Junge Puring K,Sinev I,Piontek S,Khavryuchenko O,Dürholt JP,Schmid R,Tüysüz H,Muhler M,Schuhmann W,Apfel UPdoi
10.1038/ncomms12269subject
Has Abstractpub_date
2016-07-27 00:00:00pages
12269issn
2041-1723pii
ncomms12269journal_volume
7pub_type
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