Ni–Fe synergic effect in Fe–NiOH_xboosting oxygen evolution under large current density enabled by the “in situself-corrosion” strategy

Abstract

We developed an in situ self-corrosion photodeposition method for the fabrication of a self-standing hollow Fe–NiOHx catalyst with an excellent OER activity and remarkable stability in alkaline media.

Phosphorus-modified cobalt single-atom catalysts loaded on crosslinked carbon nanosheets for efficient alkaline hydrogen evolution reaction

“…41 In some cases, the heteroatom sites in the catalyst can also promote the water dissociation process by decreasing the free-energy barrier. [42][43][44] Hence the introduction of a synergistic effect between the active sites and heteroatoms, such as nitrogen and phosphorus atoms, is desirable to further boost the alkaline HER performance. 45,46 However, due to the difficulty to regulate the coordination of single atom structure, those aforementioned methods are difficult to be applied to the transition metal SACs for HER.…”

Corrosion Engineering towards NiFe‐Layered Double Hydroxide Macroporous Arrays with Enhanced Activity and Stability for Oxygen Evolution Reaction

“…[9][10][11] Among the numerous non-noble based OER catalysts, the NiFe-based layered double hydroxides (NiFe-LDH) are displayed as the hopeful OER electrocatalysts and expected to replace the noble metal ones, owing to the excellent OER activity and low cost. [12][13][14][15][16][17][18][19][20][21][22][23][24] Despite the improvement obtained in the OER activity, the stability under large current is the major challenge to employing the NiFe-LDH in practical water splitting. Most of recent OER electrocatalysts are tested under low current densities and these catalysts maintain OER activity around 100 h. [25,26] There are two main reasons for the deactivation of catalysts.…”

“…Among the numerous non‐noble based OER catalysts, the NiFe‐based layered double hydroxides (NiFe‐LDH) are displayed as the hopeful OER electrocatalysts and expected to replace the noble metal ones, owing to the excellent OER activity and low cost [12–24] . Despite the improvement obtained in the OER activity, the stability under large current is the major challenge to employing the NiFe‐LDH in practical water splitting.…”

Deep sulfur doping induces the rapid electrochemical self-reconstruction of Ni–Fe hydroxide to drive water oxidation

“…A long-term stability is another pivotal property of OER electrocatalysts toward practical application. 50 Therefore, the durability test was first carried out using chronopotentiometry (CP) measurements. As seen in Fig.…”