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Nanoscale nickel oxide/nickel heterostructures for active hydrogen evolution electrocatalysis

Active, stable and cost-effective electrocatalysts are a key to ​water splitting for ​hydrogen production through electrolysis or photoelectrochemistry. Here we report nanoscale ​nickel oxide/​nickelheterostructures formed on ​carbon nanotube sidewalls as highly effective electrocatalysts for ​hydrogen evolution reaction with activity similar to ​platinum. Partially reduced ​nickel interfaced with ​nickel oxide results from thermal decomposition of nickel hydroxide precursors bonded to ​carbonnanotube sidewalls. The metal ion–​carbon nanotube interactions impede complete reduction and Ostwald ripening of nickel species into the less ​hydrogen evolution reaction active pure ​nickelphase. A water electrolyzer that achieves ~20 mA cm−2 at a voltage of 1.5 V, and which may be operated by a single-cell alkaline battery, is fabricated using cheap, non-precious metal-based electrocatalysts.

 

http://www.nature.com/ncomms/2014/140822/ncomms5695/full/ncomms5695.html

Nature Communications 5, Article number: 4695 doi:10.1038/ncomms5695

发布日期:2014/09/01 发布者: 点击数: