An Alkaline Al–H₂O₂ Semi‐Fuel Cell Based on a Nickel Foam Supported Co₃O₄ Nanowire Arrays Cathode

Abstract

The electrode of Co3O4 nanowire arrays directly grown on nickel foam is prepared via a facile one‐step method. The electrode is characterised by scanning and transmission electron microscopy and tested as the cathode of an Al–H2O2 semi‐fuel cell. We found that Co3O4 forms clusters of nanowires with length up to around 15 μm and diameter around 250 nm. The nanowire is composed of interconnected nanoparticles. Effects of H2O2 concentrations, catholyte KOH concentration, catholyte flow rate and operation temperature on the cell performance are investigated. The cell exhibited an open circuit voltage of 1.4 V, and peak power densities of 85 and 137 mW cm–2 at 25 and 65 °C, respectively, while running on 0.4 mol L–1 H2O2 at a flow rate of 80 mL min–1.

Direct peroxide–peroxide fuel cell – Part 2: Effects of conditions on the performance

“…Slow flow rates provokes crossover of hydrogen peroxide and H þ through the Nafion Ò membrane more significant, since the contact time of acid and base solutions increases with the decrease in the slow rate. High flow rates implies that more H 2 O 2 are supplied to the anode and cathode, and thus increase the H 2 O 2 oxidation and reduction rate at the anode and cathode respectively [26]. However, it could also increase the hydrolysis rate of H 2 O 2 at the anode and cathode catalyst surfaces leading to the cell performance reduction.…”

CuO nanosheets grown on cupper foil as the catalyst for H2O2 electroreduction in alkaline medium

“…The CuO/Cu electrode has higher utilization efficiency of active material because all CuO are in electrical contact (directly or indirectly through other particles) with the Cu foil current collector. Besides, the open spaces between CuO nanosheets allow for easy transportation of H 2 O 2 reactant and electrolyte into the inner region of the electrode and thus diminish mass transport control [30,38].…”

Electrocatalysts for Hydrogen Peroxide Reduction Used in Fuel Cells

“…41 The Al anode was supplied 3.0 M KOH solution and the catholyte contained 3.0 M KOH and 0.2 -1.0 M H2O2. 41 Cell performance with 0.4 M H2O2 catholyte improved by increasing the operation temperature, where the peak power density was 85 mW cm -2 at room temperature increased to 137 mW cm -2 at 65 °C (Fig. 17).…”