Agar chemical hydrogel electrode binder for fuel-electrolyte-fed fuel cells

• A novel ACH binder is synthesized for fuel-electrolyte-fed fuel cells.
• The ACH-based electrode offers better performance than the Nafion-based one does.
• A peak power density of 380 mW cm−2 is achieved with the ACH-based electrode.
• The ACH binder can replace the Nafion ionomers in fuel-electrolyte-fed fuel cells.

This work reports on the synthesis and application of a novel, cost-effective and environmentally friendly agar chemical hydrogel (ACH) electrode binder in fuel-electrolyte-fed fuel cells. The ACH is synthesized by a chemical cross-linking reaction between agar and glutaraldehyde with acetic acid as a catalyst. The fuel cell performance characterization demonstrates that the use of the ACH-based electrode in a fuel-electrolyte-fed fuel cell enables an improvement in cell performance as opposed to the use of conventional Nafion ionomer-based electrodes. The improved performance can be mainly attributed to the enhanced mass/charge transport rendered by the hydrophilic nature and water retention characteristic of agar. This work suggests that the cost-effective ACH binder can replace conventional Nafion ionomers for fuel-electrolyte-fed fuel cells.