Engineering Multilevel Collaborative Catalytic Interfaces with Multifunctional Iron Sites Enabling High-Performance Real Seawater Splitting

Abstract

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 Ni 2 P surfaces with affluent iron sites. Collaborative catalytic interfaces among iron phosphide, bimetallic nitride, and porous Ni 2 P 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 Fe 2 P/Ni 1.5 Co 1.5 N/Ni 2 P 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/cm 2 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/IrO 2 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.

Heterostructure Interface Engineering in CoP/FeP/CeOx with a Tailored d-Band Center for Promising Overall Water Splitting Electrocatalysis

“…The Fe 2p fine spectrum of Co3Fe in Figure c displays two series of peaks situated at binding energies of 711.57 eV (Fe 2p 3/2 ), 724.1 eV (Fe 2p 1/2 ) and 714.02 eV (Fe 2p 3/2 ), 727.49 eV (Fe 2p 1/2 ), corresponding to Fe 2+ and Fe 3+ , respectively. Similarly, peaks with binding energies of 707.28 and 720.08 eV can be assigned to Fe–P. , Two sets of satellite peaks of Fe 2p are located at 717.09 and 731.3 eV. Then, the P 2p spectrum of Co3Fe exhibits two weak peaks at 129.7 eV (P 2p 3/2 ) and 130.6 eV (P 2p 1/2 ), which are attributed to P bonded with Co and Fe, respectively (Figure d).…”

“…Similarly, peaks with binding energies of 707.28 and 720.08 eV can be assigned to Fe−P. 40,41 Two sets of satellite peaks of Fe 2p are located at 717.09 and 731.3 eV. Then, the P 2p spectrum of Co3Fe exhibits two weak peaks at 129.7 eV (P 2p 3/2 ) and 130.6 eV (P 2p 1/2 ), which are attributed to P bonded with Co and Fe, respectively (Figure 3d).…”

In situmodification of metal electrode by integrated microbial corrosion and microbial mineralization usingShewanella oneidensisfor efficient oxygen evolution

“…The electrochemically active surface areas of the catalysts were investigated on the basis of C dl measurements. 49,50 Fig. 5d shows the C dl values of different M–S 2 /NF catalysts, calculated from the CV curves across the non-faradaic region at different sweep rates (Fig.…”

Development of a Multi‐Element Copper‐Phosphorus‐Based Electrode for Efficient Hydrogen Evolution Reaction

“…[33] In Figure 4 (b), the diffraction peak at 853.4 eV and 870.7 eV corresponds to the Ni 2p 3/2 peak and Ni 2p 1/2 peak formed by the spin-orbit splitting of Ni 2p with phosphorus in the form of chemical bonds, which can be attributed to the Ni-P bond. [34] Because it is significantly higher ChemistrySelect than the 852.8 eV of nickel, it can be inferred that there are more positive charges on Ni after binding. Additionally, the diffraction peaks at 861.6 eV and 879.0 eV are the satellite characteristic peak of Ni 2p splitting.…”