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An ultra-light porous 3D Ti3C2Txaerogel electrode was prepared by freeze-drying the wet hydrogel, which has an ultrahigh rate capability and excellent cycling life.

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Development of noble-metal-free and active electrocatalysts is crucial for the oxygen evolution reaction (OER) in the water-splitting process. Herein, crystal Co x B catalysts (x = 1–3) of the OER are fabricated by a ball-milling method. Among these Co x B catalysts, Co2B exhibits the best OER activity, with a current density of 10 mA cm–2 at an overpotential of 287 mV in 1 M KOH solution. Such OER activity of Co2B is favorably comparable to that of the commercial IrO2 and most recently reported OER catalysts. Furthermore, the Co2B catalyst exhibits excellent stability with a stable current density of 50 mA cm–2 over 12 h of continuous electrolysis operation. X-ray photoelectron spectroscopy and cyclic voltammetry demonstrate that the B in Co x B makes oxidation easier, leading to their enhanced OER activities in comparison to metal Co. In addition, the Co2B electrocatalyst also exhibits high activity in the hydrogen evolution reaction; thus, the catalyst can be used as a bifunctional catalyst for full water splitting.