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Ni(OH) 2 ‐WP Hybrid Nanorod Arrays for Highly Efficient and Durable Hydrogen Evolution Reactions in Alkaline Media
Author(s) -
Kim Dokyoung,
Park Jinkyu,
Lee Jinwoo,
Zhang Zhuo,
Yong Kijung
Publication year - 2018
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201801733
Subject(s) - overpotential , phosphide , tafel equation , catalysis , nanorod , hydrogen production , noble metal , electrochemistry , electrolysis , alkaline water electrolysis , chemical engineering , electrolysis of water , water splitting , materials science , inorganic chemistry , adsorption , electrocatalyst , hydrogen , chemistry , nanotechnology , electrode , photocatalysis , organic chemistry , engineering , electrolyte
The development of efficient non‐noble‐metal hydrogen evolution electrocatalysts in alkaline media is crucial for sustainable, ecofriendly production of H 2 through water electrolysis. An alkaline hydrogen evolution reaction (HER) catalyst composed of Ni(OH) 2 ‐decorated thungsten phosphide (WP) nanorod arrays on carbon paper was synthesized by thermal evaporation and electrodeposition. This hybrid catalyst displayed outstanding HER activity and required a low overpotential of only 77 mV to obtain a current density of 10 mA cm −2 and a Tafel slope of 71 mV dec −1 . The hybrid catalyst also showed long‐term electrochemical stability, maintaining its activity for 18 h. This improved HER efficiency was attributed to the synergetic effect of WP and Ni(OH) 2 : Ni(OH) 2 effectively lowers the energy barrier during water dissociation and also provides active sites for hydroxyl adsorption, whereas WP adsorbs hydrogen intermediates and efficiently produces H 2 gas. This interfacial cooperation offers not only excellent HER catalytic activity but also new strategies for the fabrication of effective non‐noble‐metal‐based electrocatalysts in alkaline media.