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.

SUBMITTER: Liu Y 

PROVIDER: S-EPMC7160107 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature