1 research outputs found
Engineering Multilevel Collaborative Catalytic Interfaces with Multifunctional Iron Sites Enabling High-Performance Real Seawater Splitting
Given the abundant reserves of seawater
and the scarcity of freshwater,
real seawater electrolysis is a more economically appealing technology
for hydrogen production relative to orthodox freshwater electrolysis.
However, this technology is greatly precluded by the undesirable chlorine
oxidation reaction and severe chloride corrosion at the anode, further
restricting the catalytic efficiency of overall seawater splitting.
Herein, a feasible strategy by engineering multifunctional collaborative
catalytic interfaces is reported to develop porous metal nitride/phosphide
heterostructure arrays anchoring on conductive Ni2P surfaces
with affluent iron sites. Collaborative catalytic interfaces among
iron phosphide, bimetallic nitride, and porous Ni2P supports
play a positive role in improving water adsorption/dissociation and
hydrogen adsorption behaviors of active Fe sites evidenced by theoretical
calculations for hydrogen evolution reactions, and enhancing oxygenated
species adsorption and nitrate-rich passivating layers resistant to
chloride corrosion for oxygen evolution reaction, thus cooperatively
propelling high-performance bifunctional seawater splitting. The resultant
material Fe2P/Ni1.5Co1.5N/Ni2P performs excellently as a self-standing bifunctional catalyst
for alkaline seawater splitting. It requires extremely low cell voltages
of 1.624 and 1.742 V to afford current densities of 100 and 500 mA/cm2 in 1 M KOH seawater electrolytes, respectively, along with
superior long-term stability, outperforming nearly all the ever-reported
non-noble bifunctional electrocatalysts and benchmark Pt/IrO2 coupled electrodes for freshwater/seawater electrolysis. This work
presents an effective strategy for greatly enhancing the catalytic
efficiency of non-noble catalysts toward green hydrogen production
from seawater electrolysis