Anion insertion enhanced electrodeposition of robust metal hydroxide/oxide electrodes for oxygen evolution

Abstract

Electrochemical deposition is a facile strategy to prepare functional materials but suffers from limitation in thin films and uncontrollable interface engineering. Here we report a universal electrosynthesis of metal hydroxides/oxides on varied substrates via reduction of oxyacid anions. On graphitic substrates, we find that the insertion of nitrate ion in graphene layers significantly enhances the electrodeposit–support interface, resulting in high mass loading and super hydrophilic/aerophobic properties. For the electrocatalytic oxygen evolution reaction, the nanocrystalline cerium dioxide and amorphous nickel hydroxide co-electrodeposited on graphite exhibits low overpotential (177 mV@10 mA cm−2) and sustains long-term durability (over 300 h) at a large current density of 1000 mA cm−2. In situ Raman and operando X-ray diffraction unravel that the integration of cerium promotes the formation of electrocatalytically active gamma-phase nickel oxyhydroxide with exposed (003) facets. Therefore, combining anion intercalation with cathodic electrodeposition allows building robust electrodes with high electrochemical performance.

Atomic Layer Deposition of NiOOH/Ni(OH)2 on PIM‐1‐Based N‐Doped Carbon Nanofibers for Electrochemical Water Splitting in Alkaline Medium

“…The elemental energy dispersive X‐ray spectroscopy (EDS) line map confirmed the Ni‐coating over PIM‐CF, which was further confirmed by multipoint EDS (Figure S6 in the Supporting Information). The FTIR spectrum of Ni@PIM‐CF showed a broad peak at 3460 cm −1 corresponding to the O−H vibration of a hydrogen‐bonded water molecule in the inter‐lamellar space of NiOOH/Ni(OH) 2 and ν‐Ni−OH vibrations at ≤500 cm −1 (Figure C) . The XRD pattern with a slight hump at a 2 θ value of 36° and increase in the area under the peak at 43° was attributed to the presence of Ni (1 1 1) and Ni (2 0 0) facets of Ni(OH) 2 (Figure S2 in the Supporting Information) .…”

N‐Doped Carbon Nanotubes Encapsulating Ni/MoN Heterostructures Grown on Carbon Cloth for Overall Water Splitting

“…The small Tafel slope for Ni/MoN@NCNT/CC shows that it has superior electrocatalytic activity because the rate of this catalyst in OER increases faster with the increasing potential. In addition, the faradaic efficiency (FE) of Ni/MoN@NCNT/CC for OER in 1.0 M KOH was measured through a drainage method, as shown in Figure S9 (The calculations in detail are shown in supporting information) . The high FE (97.4 %, Table S1) on Ni/MoN@NCNT/CC electrode suggests the high current density mainly contributes to oxygen evolution.…”

NiFeCo oxide as an efficient and sustainable catalyst for the oxygen evolution reaction

“…The spectrum contained four main peaks at 854.2, 856.1, 860.3, and 862.2 eV. Two peaks located at 854.0 and 856.1 eV are related with Ni 2+ and Ni 3+ , respectively . The other peaks at 860.1 and 862.2 eV are the satellite peaks of nickel oxide.…”

“…Mixed metal alloys and layered double hydroxides (LDHs) have recently demonstrated outstanding electrochemical properties for the OER and HER . Other methodologies have also been employed to enhance the electrocatalytic performance of electrode materials, such as morphological engineering, hybrid composite synthesis, and doping .…”