Borate Anion Dopant Inducing Oxygen Vacancies over Co3O4 Nanocages for Enhanced Oxygen Evolution

The rational design of cost effective and highly efficient oxygen evolution reaction (OER) catalysts plays an extremely important role in promoting the commercial applications electrochemical water splitting. Herein we reported a sacrificial template strategy for preparation borate anion doped Co3O4@ZIF-67 nanocages assembled with nanosheets (B-Co3O4@ZIF-67) by hydrothermal boronation zeolitic imidazolate framework-67 (ZIF-67). During process, two different kinds sources were found to regulate morphological structures tuning etching rate between ZIF precursors anion. Moreover, doping was also induce vacancy defects, which is beneficial modulating electronic structure accelerating electron transport. Meanwhile, resultant B-Co3O4@ZIF-67 possess large specific surface area, mass transfer electrolyte exposing more catalytic active sites. Benefiting from advantages above, exhibit impressive OER performance small overpotential 334 mV, current density 10 mA cm?2, Tafel slope 73.88 mV dec?1, as well long-term durability alkaline electrolyte.