Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 21, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202000556
Keywords
bimetal catalysis; electrochemical turning; hydrogen evolution; Schottky heterojunctions; urea oxidation
Categories
Funding
- National Natural Science Foundation of China [21603157]
- Young Elite Scientists Sponsorship Program by CAST [2018QNRC001]
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Hydrogen production via water electrocatalysis is limited by the sluggish anodic oxygen evolution reaction (OER) that requires a high overpotential. In response, a urea-assisted energy-saving alkaline hydrogen-production system has been investigated by replacing OER with a more oxidizable urea oxidation reaction (UOR). A bimetal heterostructure CoMn/CoMn2O4 as a bifunctional catalyst is constructed in an alkaline system for both urea oxidation and hydrogen evolution reaction (HER). Based on the Schottky heterojunction structure, CoMn/CoMn2O4 induces self-driven charge transfer at the interface, which facilitates the absorption of reactant molecules and the fracture of chemical bonds, therefore triggering the decomposition of water and urea. As a result, the heterostructured electrode exhibits ultralow potentials of -0.069 and 1.32 V (vs reversible hydrogen electrode) to reach 10 mA cm(-2) for HER and UOR, respectively, in alkaline solution, and the full urea electrolysis driven by CoMn/CoMn2O4 delivers 10 mA cm(-2) at a relatively low potential of 1.51 V and performs stably for more than 15 h. This represents a novel strategy of Mott-Schottky hybrids in electrocatalysts and should inspire the development of sustainable energy conversion by combining hydrogen production and sewage treatment.
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