POS6-1180
Coordination-Polymer-Derived Molecular Gluing for Self-Supported Hybrid Electrocatalysts Toward Sustainable Water Splitting
When and Where
Nov 30, -0001
12:00am - 12:00am
Presenter(s)
Xiangyu Zhang (SUNKKYUNKWAN UNIVERSITY)
Co-Author(s)
Abstract
Coordination polymers and MOF-derived hybrid interfaces are increasingly important platforms for sustainable energy materials, yet robust integration of inorganic catalytic phases with conductive electrodes remains a key challenge. In this work, we present a coordination-polymer-mediated molecular glue strategy for constructing W/S co-doped cobalt molybdate (CoMo1-xWxO4-ySy) directly on cobalt foam as a binder-free bifunctional electrocatalyst. The in situ grown ZIF-67 layer functions as a porous polymeric coordination scaffold, anchoring the active oxide/sulfide phase, supplying uniformly distributed Co sites, and promoting strong interfacial coupling during hydrothermal transformation. W and S co-substitution induces a C2-to-P2/c structural evolution, increases surface roughness, and regulates the electronic structure of Co active centers through lattice distortion and charge redistribution. Benefiting from this polymer-derived interfacial architecture and dual-site electronic modulation, the optimized electrode exhibits low overpotentials of 48 mV for HER and 221 mV for OER at 10 mA cm-2 in 1.0 M KOH, with Tafel slopes of 32 and 68 mV dec-1, respectively. As both cathode and anode, the self-supported catalyst drives overall water splitting at 1.51 V and 1.69 V to reach 10 and 100 mA cm-2 and maintains stable operation for over 100 h. XPS, HRTEM, and DFT calculations reveal that W/S incorporation increases the electronic density near the Fermi level, upshifts the Co d-band center, optimizes hydrogen adsorption, and lowers the OER rate-determining barrier. This study highlights coordination-polymer-derived molecular gluing as a versatile design principle for mechanically robust, electronically regulated hybrid electrodes for clean hydrogen production.
