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High‐Performance Water Electrolysis System with Double Nanostructured Superaerophobic Electrodes
Author(s) -
Xu Wenwen,
Lu Zhiyi,
Wan Pengbo,
Kuang Yun,
Sun Xiaoming
Publication year - 2016
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.201600189
Subject(s) - electrolysis of water , materials science , oxygen evolution , electrolysis , catalysis , water splitting , hydroxide , chemical engineering , electrode , hydrogen production , alloy , hydrogen , electrochemistry , oxygen , layered double hydroxides , nanotechnology , metallurgy , electrolyte , chemistry , biochemistry , organic chemistry , photocatalysis , engineering
Catalysts screening and structural optimization are both essential for pursuing a high‐efficient water electrolysis system (WES) with reduced energy supply. This study demonstrates an advanced WES with double superaerophobic electrodes, which are achieved by constructing a nanostructured NiMo alloy and NiFe layered double hydroxide (NiFe‐LDH) films for hydrogen evolution and oxygen evolution reactions, respectively. The superaerophobic property gives rise to significantly reduced adhesion forces to gas bubbles and thereby accelerates the hydrogen and oxygen bubble releasing behaviors. Benefited from these metrics and the high intrinsic activities of catalysts, this WES affords an early onset potential (≈1.5 V) for water splitting and ultrafast catalytic current density increase (≈0.83 mA mV −1 ), resulting in ≈2.69 times higher performance compared to the commercial Pt/C and IrO 2 /C catalysts based counterpart under 1.9 V. Moreover, enhanced performance at high temperature as well as prominent stability further demonstrate the practical application of this WES.