Manipulating dehydrogenation kinetics through dual-doping Co3N electrode enables highly efficient hydrazine oxidation assisting self-powered H2 production.

Abstract:

:Replacing sluggish oxygen evolution reaction (OER) with hydrazine oxidation reaction (HzOR) to produce hydrogen has been considered as a more energy-efficient strategy than water splitting. However, the relatively high cell voltage in two-electrode system and the required external electric power hinder its scalable applications, especially in mobile devices. Herein, we report a bifunctional P, W co-doped Co3N nanowire array electrode with remarkable catalytic activity towards both HzOR (-55 mV at 10 mA cm-2) and hydrogen evolution reaction (HER, -41 mV at 10 mA cm-2). Inspiringly, a record low cell voltage of 28 mV is required to achieve 10 mA cm-2 in two-electrode system. DFT calculations decipher that the doping optimized H* adsorption/desorption and dehydrogenation kinetics could be the underlying mechanism. Importantly, a self-powered H2 production system by integrating a direct hydrazine fuel cell with a hydrazine splitting electrolyzer can achieve a decent rate of 1.25 mmol h-1 at room temperature.

journal_name

Nat Commun

journal_title

Nature communications

authors

Liu Y,Zhang J,Li Y,Qian Q,Li Z,Zhu Y,Zhang G

doi

10.1038/s41467-020-15563-8

subject

Has Abstract

pub_date

2020-04-15 00:00:00

pages

1853

issue

1

issn

2041-1723

pii

10.1038/s41467-020-15563-8

journal_volume

11

pub_type

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