AI Article Synopsis
- NiFe layered double hydroxides (LDHs) are advanced catalysts for oxygen evolution reactions but struggle with high overpotentials, prompting the introduction of boron (B) doping to enhance performance.
- A co-hydrolysis synthesis technique carefully controls B doping levels (0% to 20.3%) to improve electronic interactions, optimizing conditions for better catalytic efficiency.
- The best OER performance occurs at 13.5% B doping, resulting in a notable reduction in overpotential to 208 mV at a current density of 500 mA cm, making these engineered Ni-Fe-B catalysts promising for water-splitting applications.
Article Abstract
NiFe layered double hydroxides (LDHs) are state-of-the-art catalysts for the oxygen evolution reaction (OER) in alkaline media, yet they still face significant overpotentials. Here, quantitative boron (B) doping is introduced in NiFe LDHs (ranging from 0% to 20.3%) to effectively tailor the Ni-Fe-B electronic interactions for enhanced OER performance. The co-hydrolysis synthesis approach synchronizes the hydrolysis rates of Ni and Fe precursors with the formation rate of B─O─M (M: Ni, Fe) bonds, ensuring precise B doping into the NiFe LDHs. It is demonstrated that B, as an electron-deficient element, acts as an "electron sink" at doping levels from 0% to 13.5%, facilitating the transition of Ni to the active Ni, thereby accelerating OER kinetics. However, excessive B doping (13.5-20.3%) effectively generates oxygen vacancies in the LDHs, which increases electron density at Ni sites and hinders their transition to Ni, thereby reducing OER activity. Optimal OER performance is achieved at a B doping level of 13.5%, with an overpotential of only 208 mV to reach a current density of 500 mA cm, placing it among the most effective OER catalysts to date. This Ni-Fe-B electronic engineering opens new avenues for developing highly efficient anode catalysts for water-splitting hydrogen production.
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Article Synopsis
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