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Vertically Aligned Porous Nickel(II) Hydroxide Nanosheets Supported on Carbon Paper with Long‐Term Oxygen Evolution Performance
Author(s) -
Xiong Dehua,
Li Wei,
Liu Lifeng
Publication year - 2017
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201601590
Subject(s) - overpotential , materials science , nickel , electrochemistry , electrolysis , chemical engineering , oxygen evolution , anode , current density , carbon fibers , electrode , electrolysis of water , catalysis , nanomaterial based catalyst , nanotechnology , metallurgy , chemistry , composite material , composite number , nanoparticle , biochemistry , physics , quantum mechanics , electrolyte , engineering
Vertically aligned Ni(OH) 2 nanosheets were grown on carbon paper (CP) current collectors through a simple and cost‐effective hydrothermal approach. The as‐grown nanosheets are porous and highly crystallized. If used as a monolithic electrode for electrochemical water oxidation in alkaline solution, the carbon paper supported Ni(OH) 2 nanosheets [CP@Ni(OH) 2 ] exhibit high electrocatalytic activity and excellent long‐term stability. The electrode can attain an anodic current density of 20 mA cm −2 at a low overpotential of 338 mV, comparable to that of state‐of‐the‐art RuO 2 nanocatalysts supported on CP (CP/RuO 2 ) with the same catalyst loading. Significantly, CP@Ni(OH) 2 shows much better long‐term stability than CP/RuO 2 upon continuous galvanostatic electrolysis, particularly at a high industry‐relevant current density such as 100 mA cm −2 . CP@Ni(OH) 2 can sustain water oxidation at 100 mA cm −2 for 50 h without any degradation, whereas the performance of CP/RuO 2 is much poorer and deteriorates gradually over time. CP@Ni(OH) 2 electrodes hold substantial promise for use as low‐costing water oxidation anodes in electrolyzers.