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• W3150856908 abstract "Metal-rich transition metal sulfides recently gained increasing attention as electrocatalysts for the hydrogen evolution reaction (HER), as they are capable to overcome major challenges faced by sulfide-rich metal catalysts such as limited conductivity and the necessity of nanostructuring. Herein, we present the synthesis, characterization and electrocatalytic investigation of ternary metal-rich sulfide composites Fe x Co 9– x S 8 as well as Ni y Co 9– y S 8 ( x = y = 0–4.5), which possess pentlandite-type structures. In this study, we show a stepwise alteration of the binary cobalt pentlandite Co 9 S 8 and report on the replacement of cobalt with up to 4.5 equivalents of either iron or nickel. These altered pentlandite composites facilitate the proton reduction in acidic media at different temperatures. We furthermore show that the stoichiometric variation has a decisive influence on the electrochemical activation/deactivation behavior of the catalysts under reductive electrocatalytic conditions. Here, Co-deficient composites display an improved HER performance in contrast to Co 9 S 8 . Notably, Ni/Co compounds generally tend to show higher catalytic activities towards HER than their respective Fe/Co compounds. A series of Ni/Co- and Fe/Co- sulfide composites based on Co 9 S 8 pentlandite have been synthesized and tested for their HER performance at different temperatures, revealing a higher activity for Co-deficient compounds due to a complex phase-dependent interplay." @default.
• W3150856908 created "2021-04-13" @default.
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• W3150856908 date "2021-08-01" @default.
• W3150856908 modified "2023-10-14" @default.
• W3150856908 title "Fe/Co and Ni/Co-pentlandite type electrocatalysts for the hydrogen evolution reaction" @default.
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• W3150856908 doi "https://doi.org/10.1016/s1872-2067(20)63682-8" @default.
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