Developing efficient, environmentally friendly and cost-effective non-precious metal electrocatalysts for the oxygen evolution reaction (OER) is essential to alleviate the energy crisis and environmental pollution. Herein, we report a simple and practical method to prepare non-precious metal catalysts, namely iron-modulated Ni3S2 (Fe-Ni3S2/NF) on nickel foam, by growing a Ni-MOF directly on 3D porous conductive nickel foam, followed by the formation of Ni-MOF-based Prussian blue analogs (Ni-MOF@PBA) via in situ cation exchange reactions, which are further sulfidated to iron-modulated Ni3S2. Based on a series of characterization results, it is confirmed that iron acts as a modulator at the Ni active site, leading to electron depletion, thereby modulating the electron spin state and optimizing the binding energy of key reaction intermediates, resulting in highly exposed active sites and acceleration of OER reaction kinetics. The synthesized Fe-Ni3S2/NF exhibits excellent activity in alkaline media, which needs overpotentials of only 232 mV and 287 mV to drive current densities of 10 mA cm−2 and 50 mA cm−2, respectively. Additionally, Fe-Ni3S2/NF exhibits excellent stability for at least 24 h during the OER process. This work presents a rational design and synthesis of transition metal-based catalysts with nanocone structures, providing a new strategy for assembling advanced materials and insights for exploring various energy storage and conversion systems.
Manigandan Ramadoss,Yuanfu Chen,Xin Chen,Zhe Su,Marimuthu Karpuraranjith,Dongxu Yang,Manzoor Ahmad Pandit,Krishnamurthi Muralidharan
Rational construction of self-template catalysts for efficient electrolytic water splitting reactions is being a challenging prospect in sustainable energy production. For the first time, owing to these aims, we report a self-template representation of self-assembled iron-modulated cobalt-nickel phosphide (Fe-CoNiP) grown on 3D-nickel foam (NF) using a facile amine hydrolysis-approached synergetic phosphorylation strategy. Due to its unique vertically standing self-template hierarchical nanoarrays and atomic modulated multicomponent system, these Fe-CoNiP nanoarchitectures exhibit excellent electrocatalytic hydrogen and oxygen evolution reactions with very low applied overpotentials of 110 and 280 mV to obtain 10 mA cm–2, respectively, and an overpotential value of 390 mV (J10) obtained for overall water splitting overtakes most precious-metal/phosphide-based electrocatalysts in an alkaline medium. Moreover, the rationally cocrystallized Fe-CoNiP binder-free electrocatalyst as a multifunctional electrode has robust physicochemical stability above 2 days with very little degradation during alkaline electrolysis. These demonstrated results may lead to new insights into constructing an alternative electrocatalyst with hierarchical nanoarchitecture to boost the overall water splitting.
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