title: Hydroxide Self-Feeding High-Temperature Alkaline Direct Formate Fuel Cells.
abstract: Conventionally, both the thermal degradation of the anion-exchange membrane and the requirement of additional hydroxide for fuel oxidation reaction hinder the development of the high-temperature alkaline direct liquid fuel cells. The present work addresses these two issues by reporting a polybenzimidazole-membrane-based direct formate fuel cell (DFFC). Theoretically, the cell voltage of the high-temperature alkaline DFFC can be as high as 1.45 V at 90 °C. It has been demonstrated that a proof-of-concept alkaline DFFC without adding additional hydroxide yields a peak power density of 20.9 mW cm-2, an order of magnitude higher than both alkaline direct ethanol fuel cells and alkaline direct methanol fuel cells, mainly because the hydrolysis of formate provides enough OH-ions for formate oxidation reaction. It was also found that this hydroxide self-feeding high-temperature alkaline DFFC shows a stable 100 min constant-current discharge at 90 °C, proving the conceptual feasibility.
authors.affiliation: Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi'an Jiaotong University, No. 28 Xianning West Road, Xi'an, Shaanxi, 710049, P. R. China.
authors.forename: Yinshi
authors.initials: Y
authors.lastname: Li
authors.affiliation: Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi'an Jiaotong University, No. 28 Xianning West Road, Xi'an, Shaanxi, 710049, P. R. China.
authors.forename: Xianda
authors.initials: X
authors.lastname: Sun
authors.affiliation: Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi'an Jiaotong University, No. 28 Xianning West Road, Xi'an, Shaanxi, 710049, P. R. China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Feng
mesh_terms: D000468:Alkalies / Q000737:chemistry*; D005561:Formates / Q000737:chemistry*; D006358:Hot Temperature; D006878:Hydroxides / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D000468:Alkalies; D005561:Formates; D006878:Hydroxides; C030544:formic acid
keywords: formate; fuel cells; hydrolysis; membrane; oxidation