Pentlandite rocks as sustainable and stable efficient electrocatalysts for hydrogen generation.

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 Commun

journal_title

Nature communications

authors

Konkena B,Junge Puring K,Sinev I,Piontek S,Khavryuchenko O,Dürholt JP,Schmid R,Tüysüz H,Muhler M,Schuhmann W,Apfel UP

doi

10.1038/ncomms12269

subject

Has Abstract

pub_date

2016-07-27 00:00:00

pages

12269

issn

2041-1723

pii

ncomms12269

journal_volume

7

pub_type

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