Binary nickel iron phosphide composites with oxidized surface groups as efficient electrocatalysts for the oxygen evolution reaction

Abstract

We have synthesized the binary NiFeOH, NiFeO and NiFeP two-dimensional (2D) nanosheets on carbon cloth (CC) via a facile hydrothermal method combined with phosphorization and oxidation treatment.

Self-Supported FeNiP Nanosheet Arrays as a Robust Bifunctional Electrocatalyst for Water Splitting

“…The Ni 2p spectrum in Figure e showed two spin–orbit doublets corresponding to 2p 1/2 (874.48 eV) and 2p 3/2 (856.18 eV) of Ni 2+ in the Ni–P bond and satellite peaks at 860.88 and 880.38 eV. ,, The high-resolution Fe 2p spectrum is presented in Figure f, and peaks were divided into four characteristic peaks. Two peaks at 723.58 and 709.30 eV correlated to 2p 1/2 and 2p 3/2 of Fe 2+ in the Fe–P bond, while the other two peaks at 726.48 and 712.38 eV corresponded to 2p 1/2 and 2p 3/2 of Fe 3+ in the Fe–O bond. ,,, In Figure g, the P 2p XPS segment showed a weak peak at 129.58 eV, which was related to P 2p 3/2 . Notably, the P 2p 1/2 peak was too weak to be detected, while the intense peak of the P–O bond appeared at 132.88 eV.…”

“…Two peaks at 723.58 and 709.30 eV correlated to 2p 1/2 and 2p 3/2 of Fe 2+ in the Fe−P bond, while the other two peaks at 726.48 and 712.38 eV corresponded to 2p 1/2 and 2p 3/2 of Fe 3+ in the Fe−O bond. 19,34,37,38 In Figure 2g, the P 2p XPS segment showed a weak peak at 129.58 eV, which was related to P 2p 3/2 . 35 Notably, the P 2p 1/2 peak was too weak to be detected, while the intense peak of the P−O bond appeared at 132.88 eV.…”

“…In recent years, transition-metal-based electrocatalysts, such as selenides, , borides, , sulfides, , carbides, , nitrides, , and phosphides, , have emerged as alternatives of noble metal electrocatalysts (Pt, IrO 2 , and RuO 2 ) , due to shortage of reserves and high prices. Among these non-noble electrocatalysts, transition metal phosphides (TMPs) are identified to be effective for both the HER and OER and have received substantial attention owing to their excellent catalytic activity and chemical stability. , In addition, bimetallic phosphides with a special interaction between metal atoms are more advantageous than monometallic phosphides in terms of their electrocatalytic performance.…”

Anchoring of Ni12P5 Microbricks in Nitrogen- and Phosphorus-Enriched Carbon Frameworks: Engineering Bifunctional Active Sites for Efficient Water-Splitting Systems

“…Finally, dioxygen is formed at the interface and detached as oxygen gas from the surface of the active sites (eqs and ). Moreover, the partially oxidized species (*OOH/*O 2 ) formed on the surface of the nickel phosphide core in Ni 12 P 5 @N,P-C­(5) play a vital role as the metal oxide on the surface is demonstrated to be active for the OER . Therefore, the redox of the Ni is critical for the OER in the Ni 12 P 5 @N,P-C­(5) electrocatalyst.…”

In Situ Reconstructed Layered Double Hydroxides via MOF Engineering and Ru Doping for Decoupled Acidic Water Oxidation Enhancement

“…The presence of Ni−O species was confirmed by the appearance of satellite peaks at 861.7 and 879.5 eV. 70,71 The presence of Ni 2+ in the NC 3D structure indicated the valence state within pristine NiCo-LDH, 72,73 suggesting that NC served as the M-source to provide M-ions for the in situ conversion to NCRB. 47 The increase in the Ni 3+ states was attributed to the incorporation 4d).…”