학술논문
Dual hydrogen production from electrocatalytic water reduction coupled with formaldehyde oxidation via a copper-silver electrocatalyst
Document Type
Original Paper
Author
Source
Nature Communications. 14(1)
Subject
Language
English
ISSN
2041-1723
Abstract
The broad employment of water electrolysis for hydrogen (H2 ) production is restricted by its large voltage requirement and low energy conversion efficiency because of the sluggish oxygen evolution reaction (OER). Herein, we report a strategy to replace OER with a thermodynamically more favorable reaction, the partial oxidation of formaldehyde to formate under alkaline conditions, using a Cu3 Ag7 electrocatalyst. Such a strategy not only produces more valuable anodic product than O2 but also releases H2 at the anode with a small voltage input. Density functional theory studies indicate the H2 C(OH)O intermediate from formaldehyde hydration can be better stabilized on Cu3 Ag7 than on Cu or Ag, leading to a lower C-H cleavage barrier. A two-electrode electrolyzer employing an electrocatalyst of Cu3 Ag7 (+)||Ni3 N/Ni(–) can produce H2 at both anode and cathode simultaneously with an apparent 200% Faradaic efficiency, reaching a current density of 500 mA/cm2 with a cell voltage of only 0.60 V.
Water electrolysis typically requires a large voltage input and produces H2 only at the cathode. Here the authors present a strategy of coupling formaldehyde oxidation with water reduction and report H2 production at both anode and cathode with small voltage inputs.
Water electrolysis typically requires a large voltage input and produces H