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Porosity-Engineering MXene as Supporting Material for Highly Efficient Electrocatalyst toward Overall Water Splitting.

The usage of two-dimensional (2D) transition metal carbide MXenes as supporting materials to incorporate the catalytic active compounds is of interest owning to their unique properties. Yet, the preparation of the well-dispersed catalytic phases on the interconnected porous MXene network has been a challenging issue and rarely been explored. This work focuses on the synthesis of basal plane-porous titanium carbide MXene (namely, ac-Ti 3 C 2 ) that subsequently is used as the effective host for incorporating with known-catalytic active phase (IrCo) as effective bi-functional electrocatalyst toward water splitting reaction. The porous ac-Ti 3 C 2 with abundant of macro/mesos/micropores is prepared via wet chemical method at room temperature, providing ideal anchor sites for its intimate chemical bonding with alien compounds. The resulting IrCo@ac-Ti 3 C 2 electrocatalyst exhibits a superior reactivity (220 mV at 10 mA cm -2 ) toward oxygen evolution reaction in 1.0 M KOH, surpassing the benchmark RuO 2 , a low voltage cell of 1.57 V (@ 10 mA cm -2 ) and a long-term durability. Our work demonstrates the effectiveness of porosity engineering in MXene nanosheets as the supporting material for sufficiently shortening the ion migration pathways and increasing the electrolyte accessibility in between intersheets, and finally overcoming the inherited restacking and aggregation issues.