An Innovative Way to Turn Catalyst into Substrate for Highly Efficient Water Splitting

Abstract

The energy‐efficiency loss with high overpotential during hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), as well as economic inefficiencies including high‐cost materials and complicated processes, is considered the major challenge to the implementation of electrochemical water splitting applications. The authors present a new platform for electrocatalysts that functions in an unprecedented way to turn a catalyst into substrate. The NiFe alloy catalyzed substrate (NiFe‐CS) described herein is substantially active and stable electrocatalyst for both HER and OER, with low overpotential of 33 and 191 mV at 10 mA cm−2 for HER and OER, respectively. This structure enables not only the maximization of electrochemically active sites, but also the formation of hydroxyl species on the surface as the active phase. These outstanding results provide a new pathway for the development of electrocatalysts used in energy conversion technology.

Construction of a S and Fe co-regulated metal Ni electrocatalyst for efficient alkaline overall water splitting

“…To seek alternative catalysts for precious metals, exploration of transition metal based catalysts including single-atom catalysts, [8][9][10][11] alloys, 1,12 phosphides, [13][14][15][16][17] oxides, 18,19 (oxy) hydroxides, [20][21][22] suldes, 23,24 etc., has never stopped. Transition metals with excellent conductivity have attracted extensive attention.…”

Electrochemically Activated Ni-Fe Oxyhydroxide for Mimic Saline Water Oxidation

“…In addition, O 1s core-level XPS spectra suggest the dominant surface feature of hydroxyl species for both samples (ca. 81.8–82.8%) as in line with their oxyhydroxide characteristic. , The valence state and local coordination structure information are further probed by X-ray absorption spectroscopy (XAS). Figure D shows the normalized X-ray absorption near-edge structure (XANES) spectra at the Fe K-edge and the Ni K-edge, with Fe and Ni metals, Fe 2 O 3 , and NiO as references.…”

Amine-assisted synthesis of the Ni3Fe alloy encapsulated in nitrogen-doped carbon for high-performance water splitting

“…6,7 On the other hand, noble metalbased catalysts, such as Pt/C for the HER and RuO 2 /IrO 2 for the OER are currently considered as typical bench-mark catalysts for electrochemical water splitting, but the extreme scarcity, high cost, and poor stability of these materials severely hinder their scale-up application. [8][9][10] Therefore, it is of paramount importance to develop highly practical and efficient electrocatalysts for water splitting.…”