Highly reversible zinc anode enabled by a trace-amount additive with pH buffering capability

Trace-amount additive (10 mM, 0.1 wt%), ammonium succinate, was introduced to endow electrolyte with excellent pH buffering ability, resulting in high CE (99.91% and 99%) at low current density (1 mA cm −2 and 0.5 mA cm −2 ) and high cycle stability.