Journal of Colloid and Interface Science, Vol.587, 581-589, 2021
Atomic-level tungsten doping triggered low overpotential for electrocatalytic water splitting
The design of electrocatalysts with lower overpotential is of great significance for water splitting. Herein, cobalt hydroxide carbonate (CCH) has been used as a model to demonstrate the boost of its oxygen evolution reaction (OER) activity by atomic doping of W6+(W-CCH). The 5 at % W doping reduced the OER overpotential of CCH by 95.3 mV at 15 mA cm(-2), and increased the current density by 2.8 times at 1.65 V. 5%W-PCCH parallel to 5%W-CCH-based electrolyzer only required a potential of 1.65 V to afford 10 mA cm(-2) for full water splitting. The W6+ in CCH are active sites for O-2(-) adsorption and induced an incesaed electron density near the Fermi level, which facilitates the charge transfer during electrocatalysis. The W6+ doping has been validated as an efficient booster for transition-metal carbonate hydroxides-based electrocatalysts, which has half or more than half-filled d-bands. (c) 2020 Elsevier Inc. All rights reserved.