Enhanced electrochemical Cs + extraction performance enabled by a MoS 2 /Ni 3 S 2 heterostructure counter electrode

In this work, for the first time, an MoS₂/Ni₃S₂ heterostructure (MSNS) was employed as the counter electrode. When combined with an unmodified Cu-PBA working electrode, the equilibrium adsorption capacity reached up to 579.66 mg g^-1 and it demonstrated high Cs⁺ selectivity and excellent cycling stability. A detailed study indicated that the exceptional HER/OER catalytic activity of MSNS mitigated polarization and expedited electron transfer, thereby augmenting the electrochemical Cs⁺ extraction performance.