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The electrochemistry of a direct borohydride fuel cell employing a gel polymer electrolyte was studied. Sago, a natural polymer, was employed as the polymer host for the gel polymer electrolyte. The biodegradability and low toxicity characteristics of natural polymers make them the best candidates to replace synthetic polymers as host polymers. An electrolyte composed of sago, potassium hydroxide (KOH) as reactant, and sodium borohydride (NaBH4) as fuel was prepared and evaluated as a novel gel polymer electrolyte for a direct borohydride fuel cell. An optimum composition of sago + 6 M KOH +...