One-step construction of Co(OH)2-anchored g-C3N4 and rGO with phase junction for dopamine sensing and oxygen evolution reaction

Cobalt-based Layered double hydroxides (Co-LDHs) through designing composite nanostructures and heterogenous junctions, has absorbed an increased concern for dual-function applications including electrochemical sensing and energy devices. Herein, the g-C3N4 and GO are applied as two-dimensional (2D) scaffolds for one-pot synthesis of 2D alpha/beta-Co(OH)(2) phase junction (alpha/beta-Co(OH)(2)/g-C3N4/rGO, denoted as CCG) in dopamine sensing and oxygen evolution reaction (OER). The coexist of hetero-phase structure (alpha and beta-Co(OH)(2)) toward crystalline phase has been confirmed by various techniques. Dependent on hetero-phase structural and compositional characteristics of CCG, CCG has revealed excellent electrochemical performance: a ranking sensing response to dopamine with ppb-level sensitivity and wide detection range; and high electrocatalytic ability (38.02 mV dec(-1)) with more stable catalytic capacity toward oxygen evolution reaction (OER). The above considerable potentials for CCG ascribes to the synergistic effect of heterostructure, phase structure along with defect of alpha/beta-Co(OH)(2).