Engineering defect-rich Fe-doped NiO coupled Ni cluster nanotube arrays with excellent oxygen evolution activity

Lei, Yaqi; Xu, Tingting; Ye, Shenghua; Zheng, Lirong; Peng, Liao; Xiong, Wei; Hu, Jing; Wang, Yajie; Wang, Jingpeng; Ren, Xiangzhong; He, Chuanxin; Zhang, Qianling; Liu, Jianhong; Sun, Xueliang

doi:10.1016/j.apcatb.2020.119809

Cited by 118 publications

(55 citation statements)

References 51 publications

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“…In most electrocatalysts, OER proceeds through the adsorbate evolution mechanism (AEM). 9–11 This conventional mechanism requires catalysts with proper adsorption sites, i.e. surface sites that, according to the Sabatier principle, bind reactants/intermediates/products neither too strongly nor too weakly.…”

Section: Introductionmentioning

confidence: 99%

Activating the lattice oxygen oxidation mechanism in amorphous molybdenum cobalt oxide nanosheets for water oxidation

et al. 2022

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Section: Introductionmentioning

confidence: 99%

Activating the lattice oxygen oxidation mechanism in amorphous molybdenum cobalt oxide nanosheets for water oxidation

et al. 2022

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“…In addition, we evaluated the long-term stability of the NiFe LDHs/Ni fiber electrode through the chronopotentiometry test and studied different current densities (10, 50, 100, 200, 300, and 10 mA cm −2 ) for a total of 60 h (Figure 5e). Figure 5f summarizes the OER performance comparison between NiFe LDHs/Ni fiber electrode and the newly reported non-noble metal-based self-supporting electrodes (see Table 1) [5,6,[40][41][42][43][44][45][46].…”

Section: Oer Performance In Alkaline Mediamentioning

confidence: 99%

Self-Supporting NiFe Layered Double Hydroxide “Nanoflower” Cluster Anode Electrode for an Efficient Alkaline Anion Exchange Membrane Water Electrolyzer

Guo

Chi

et al. 2022

Energies

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The development of an efficient and durable oxygen evolution reaction (OER) electrode is needed to solve the bottleneck in the application of an anion exchange membrane water electrolyzer (AEMWE). In this work, the self-supporting NiFe layered double hydroxides (NiFe LDHs) “nanoflower” cluster OER electrode directly grown on the surface of nickel fiber felt (Ni fiber) was synthesized by a one-step impregnation at ambient pressure and temperature. The self-supporting NiFe LDHs/Ni fiber electrode showed excellent activity and stability in a three-electrode system and as the anode of AEMWE. In a three-electrode system, the NiFe LDHs/Ni fiber electrode showed excellent OER performance with an overpotential of 208 mV at a current density of 10 mA cm−2 in 1 M KOH. The NiFe LDHs/Ni fiber electrode was used as the anode of the AEMWE, showing high cell performance with a current density of 0.5 A cm−2 at 1.68 V and a stability test for 200 h in 1 M KOH at 70 °C. The electrocatalytic performance of NiFe LDHs/Ni fiber electrode is due to the special morphological structure of “nanoflower” cluster petals stretching outward to produce the “tip effect,” which is beneficial for the exposure of active sites at the edge and mass transfer under high current density. The experimental results show that the NiFe LDHs/Ni fiber electrode synthesized by the one-step impregnation method has the advantages of good activity and low cost, and it is promising for industrial application.

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“…The first is single‐atom (SA) doping, which consists of introducing the foreign elements into the crystal lattice of NiO that then work as the reaction sites by replacing the surface Ni 2+ . [ 17,19–22 ] The SA‐doping elements can also bring in vacancy sites for improving electrical conductivity [ 23,24 ] and activate the neighboring Ni 2+ for adsorbing water molecules to generate the *OH species. [ 23 ] A metal element with a higher valence state than Ni 2+ , for example, Ir 4+ or W 6+ , has been confirmed to be effective for enhancing the OER performance owing to its more‐unoccupied orbital, [ 7,19 ] and apparently, the more plentiful the surface‐exposed SA‐doping sites, the greater the improvement of NiO activity; however, the stability of the SA‐doped elements is crucial to long‐duration OER and the appropriate preparation method is required.…”

Section: Introductionmentioning

confidence: 99%

Single‐Atom Doping and High‐Valence State for Synergistic Enhancement of NiO Electrocatalytic Water Oxidation

et al. 2021

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The NiO‐based electrocatalytic oxygen evolution reaction (OER) of water splitting is recognized as a promising approach to produce clean H2 fuel. However, the OER performance is still low, and especially, the overpotential is larger than 200 mV at the current density of 10 mA cm−2. Herein, an Ir@IrNiO sample is prepared with single‐atom (SA) Ir4+ doping and surface metallic Ir nanoparticles loaded onto the NiO. Owing to the bonding of the loaded Ir with surface‐exposed Ni2+, the nearby Ni atoms exist in the +3 valence state, that is, the surface‐loaded Ir particles behave like a stabilizer for the Ni3+ sites. Under the synergistic effect of SA Ir4+ and high‐valance‐state Ni3+, the Ir@IrNiO nanostructure effectively reduces the overpotential to 195 mV at a current density of 10 mA cm−2. Moreover, it gives an Ir‐content‐normalized current density of 0.0457 A mgIr−1, 72.1 times higher than that of the best commercialized IrO2 (6.33 × 10−4 A mgIr−1), under the condition of 1.5 V versus reversible hydrogen electrode. Operando Raman and X‐ray absorption fine‐structure (XAFS) measurements reveal that there are more surface‐active species of Ni3+, which adsorb and activate water molecules to form Ni3+–*OH at low voltage, the intermediate of Ni4+–•O is then formed at a relatively high bias voltage, and then the •O is transferred to the SA Ir4+ sites to generate Ir4+–O–O with OH at increased voltage. This work can help design more SA‐based highly active OER materials.

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Engineering defect-rich Fe-doped NiO coupled Ni cluster nanotube arrays with excellent oxygen evolution activity

Cited by 118 publications

References 51 publications

Activating the lattice oxygen oxidation mechanism in amorphous molybdenum cobalt oxide nanosheets for water oxidation

Activating the lattice oxygen oxidation mechanism in amorphous molybdenum cobalt oxide nanosheets for water oxidation

Self-Supporting NiFe Layered Double Hydroxide “Nanoflower” Cluster Anode Electrode for an Efficient Alkaline Anion Exchange Membrane Water Electrolyzer

Single‐Atom Doping and High‐Valence State for Synergistic Enhancement of NiO Electrocatalytic Water Oxidation

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