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Phosphorus‐Modified Tungsten Nitride/Reduced Graphene Oxide as a High‐Performance, Non‐Noble‐Metal Electrocatalyst for the Hydrogen Evolution Reaction
Author(s) -
Yan Haijing,
Tian Chungui,
Wang Lei,
Wu Aiping,
Meng Meichen,
Zhao Lu,
Fu Honggang
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201501419
Subject(s) - overpotential , tafel equation , electrocatalyst , graphene , oxide , materials science , exchange current density , nitride , inorganic chemistry , catalysis , chemical engineering , nanotechnology , chemistry , electrochemistry , metallurgy , electrode , organic chemistry , layer (electronics) , engineering
Phosphorus‐modified tungsten nitride/reduced graphene oxide (P‐WN/rGO) is designed as a high‐efficient, low‐cost electrocatalyst for the hydrogen evolution reaction (HER). WN (ca. 3 nm in size) on rGO is first synthesized by using the H 3 [PO 4 (W 3 O 9 ) 4 ] cluster as a W source. Followed by phosphorization, the particle size increase slightly to about 4 nm with a P content of 2.52 at %. The interaction of P with rGO and WN results in an obvious increase of work function, being close to Pt metal. The P‐WN/rGO exhibits low onset overpotential of 46 mV, Tafel slope of 54 mV dec −1 , and a large exchange current density of 0.35 mA cm −2 in acid media. It requires overpotential of only 85 mV at current density of 10 mA cm −2 , while remaining good stability in accelerated durability testing. This work shows that the modification with a second anion is powerful way to design new catalysts for HER.