Premium
Understanding the Co : Mo Compositional Modulation and Fe‐Interplay in Multicomponent Sulfide Electrocatalysts for Oxygen and Hydrogen Evolution Reactions
Author(s) -
Mukherji Aniruddha,
Bal Rajaram,
Srivastava Rajendra
Publication year - 2020
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202000314
Subject(s) - overpotential , oxygen evolution , catalysis , cobalt , water splitting , anode , electrocatalyst , molybdenum , oxygen , hydrogen , hydrogen production , inorganic chemistry , materials science , chemical engineering , chemistry , electrochemistry , electrode , biochemistry , organic chemistry , photocatalysis , engineering
Amidst the escalating urge in the economical generation of clean hydrogen fuel from water, this article presents the development of simple and economical electrocatalysts, Cobalt Molybdenum Sulfides (Co−Mo−S), for oxygen evolution (OER) and hydrogen evolution (HER) reactions. The compositional modulation of Co and Mo produces the highly active catalysts, Co 0.75 Mo 0.25 S x for OER and Co 0.40 Mo 0.60 S x for HER. Moreover, the potentiality of Fe incorporation in CoMoS x is demonstrated in enhancing the OER performance of the catalyst. The best catalyst for OER (Fe 0.05 Co 0.70 Mo 0.25 S x ) achieves a current of 10 mA cm −2 at an overpotential (η 10 ) of 227 mV (1.457 V vs RHE) while that for HER (Co 0.40 Mo 0.60 S x ) requires only 130 mV (−0.13 V vs. RHE) of η 10 . The holistic enhancement of the OER kinetics is attributed to the facile generation of CoOOH in the co‐existence of Fe at oxidation states≥+3, and Mo at +6 and +5 states. Finally, a complete water electrolyser is demonstrated using Fe 0.05 Co 0.70 Mo 0.25 S x as the anode and Co 0.40 Mo 0.60 S x as the cathode.