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Molybdenum Sulphoselenophosphide Spheroids as an Effective Catalyst for Hydrogen Evolution Reaction
Author(s) -
Bose Ranjith,
Jothi Vasanth Rajendiran,
Koh Beomsoo,
Jung Chiyoung,
Yi Sung Chul
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201703862
Subject(s) - tafel equation , catalysis , molybdenum , chalcogenide , chemical engineering , materials science , platinum , hydrogen , ternary operation , reversible hydrogen electrode , inorganic chemistry , electrode , nanotechnology , chemistry , electrochemistry , organic chemistry , working electrode , metallurgy , computer science , engineering , programming language
Electrocatalytic splitting of water is the most convincing and straight forward path to extract hydrogen, but the efficiency of this process relies heavily on the catalyst employed. Here, molybdenum sulphoselenophosphide (MoS 45.1 Se 11.7 P 6.1 ) spheroids are reported as an active catalyst for the hydrogen evolution reaction (HER) and this is the first attempt to study on ternary anion based molybdenum chalcogenides. As‐prepared MoS x Se y P z catalyst reveals a unique morphology of microspheroids capped by stretched‐out nanoflakes that exhibits excellent electrocatalytic activity ( j —10 mA cm −2 @ 93 mV, Tafel slope of 50.1 mV dec −1 , TOF—0.40 s −1 ) fairly closer to the performance of platinum (Pt) and predominant to those of the pre‐existing Mo‐chalcogenides and phosphides. Such an increase in performance stems from the copious amount of active edge sites, the presence of nanoflakes, and high circumferential area exposed by the spheroids. Besides, the electrode with MoS 45.1 Se 11.7 P 6.1 displays excellent stability in acidic medium over 10 h of continuous operation. This work paves way for improving the catalytic activity of existing Mo‐chalcogenide compounds by doping suitable mixed anions and also reveals the integral role of anions as well as their synergetic effects on the surface physiochemical properties and the HER catalysis.