Cobalt-Doped Iron Sulfide as an Electrocatalyst for Hydrogen Evolution. Issue 4 (3rd February 2017)

• Record Type: Journal Article
• Authors: Huang, Sheng-Yang; Sodano, Daniel; Leonard, Thomas; Luiso, Salvatore; Fedkiw, Peter S.
• Is Part Of: Journal of the Electrochemical Society. Volume 164:Issue 4(2017)
• Page Start: F276
• Page End: F282
• Publication Date: 2017-02-03
• Subjects: cobalt sulfide -- electrocatalysis -- hydrogen evolution reaction -- iron sulfide -- pyrite -- sulfurization; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0761704jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Iron disulfide (FeS2 ) promises an earth-abundant, low-cost alternative to platinum group metals for the hydrogen evolution reaction (HER), but its performance is currently limited by reactivity of active sites and poor electrical conductivity. Here we employ Ketjenblack (KB) as a support to create an Fe-based electrocatalyst with high-electrical conductivity and maximal active sites. Moreover, a systematic study on the role of cobalt (Co) dopant was carried out. Electrochemical results show enhancements in HER activity of Co-doped FeS2 [Fe x Co1− x S2, atomic content of Fe ( x ) = 0.98 – 0.32] in comparison to un-doped FeS2 in acidic electrolyte (pH = 0). The overpotential necessary to drive a current density of 10 mA/cm 2 is −0.150 V and only decreases by 1 mV after 500 cycles of a durability test (cycling the potential between 0.0 and −0.15 V), indicating a long-term durability in acidic environment. This work suggests that Fe x Co1− x S2 offers a viable approach to improve the activity and durability of transition metal-sulfide electrocatalysts.