A novel alkaline redox couple: chemistry of the Fe(6+)/B(2-) super-iron boride battery.

A high capacity alkaline redox storage chemistry is explored based on a novel, environmentally benign zirconia stabilized Fe(6+)/B(2-) chemistry, which sustains an electrochemical potential matched to the pervasive, conventional MnO(2)-Zn battery chemistry, however with a much higher electrochemical capacity.