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Download fileHighly Efficient and Stable Catalyst Based on Co(OH)2@Ni Electroplated on Cu-Metallized Cotton Textile for Water Splitting
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posted on 2019-08-07, 13:38 authored by Zining Wang, Shan Ji, Fusheng Liu, Hui Wang, Xuyun Wang, Qizhao Wang, Bruno G. Pollet, Rongfang WangThe
concept of using renewable energy to power water electrolyzers
is seen as a favorable approach for the production of green and sustainable
hydrogen. The electrochemical water splitting can be significantly
and efficiently enhanced using bifunctional catalysts, which are active
toward both oxygen evolution reaction (OER) and hydrogen evolution
reaction (HER). Herein, a stable and high-performance catalyst based
on hybrid-metal/metal-hydroxide nanosheet arrays electroplated onto
Cu-metallized cotton textile (Co(OH)2@Ni) was designed
and fabricated as a bifunctional electrocatalyst for complete water-splitting
reactions. It was found that the interconnected α-Co(OH)2 nanosheets were evenly formed onto the metalized cotton textile,
and the optimized Co(OH)2@Ni sample exhibited an overpotential
of +96 mV at 10 mA cm–2, with excellent stability
toward HER. The as-prepared catalyst also showed superior electrochemical
activity and durability toward OER, which was found to be comparable
to those of conventional precious group metal-based catalysts. In
addition, when Co(OH)2@Ni were assembled as electrodes
in a water electrolyzer (1 M KOH), a cell voltage of 1.640 V was achieved
at a current density of 10 mA cm–2, enabling it
to be a promising bifunctional catalyst for water electrolysis in
real applications.
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bifunctional electrocatalystcotton textileStable Catalystbifunctional catalystnanosheetWater SplittingNi ElectroplatedCu-metallized cotton textilebifunctional catalystswater electrolysishydrogen evolution reactionwater-splitting reactionscell voltagecmoxygen evolution reactionelectrochemical activitygroup metal-based catalysts1.640 Vpower water electrolyzersmAHERelectrochemical water splittingOERNi sampleKOHas-prepared catalystCu-Metallized Cotton Textile