A layered Na1−xNiyFe1−yO2double oxide oxygen evolution reaction electrocatalyst for highly efficient water-splitting

Weng, Baicheng; Xu, Fenghua; Wang, Changlei; Meng, Weiwei; Grice, Corey R.; Yan, Yanfa

doi:10.1039/c6ee03088b

Cited by 207 publications

(103 citation statements)

References 52 publications

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“…However,their largescale applications are greatly limited by their low reserves and high prices. [17,18] Accordingly,e xtensive efforts have been devoted to develop highperformance and earth-abundant electrocatalysts for OER, such as perovskite oxides, [19][20][21][22] spinels, [23][24][25] the layer structure materials, [26][27][28] metal borides, [29] metal carbides, [30,31] metal chalcogenides, [9] metal pnictides, [32][33][34] organometallics, [35] and non-metal materials. [36,37] In particular,l ayered NiFe oxides/hydroxides have been demonstrated as the most active catalysts in alkaline electroyltes.…”

Section: Introductionmentioning

confidence: 99%

Application of In Situ Techniques for the Characterization of NiFe‐Based Oxygen Evolution Reaction (OER) Electrocatalysts

2018

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Developing high-efficiency and affordable electrocatalysts for the sluggish oxygen evolution reaction (OER) remains a crucial bottleneck on the way to the practical applications of rechargeable energy storage technologies and water splitting for producing clean fuel (H ). In recent years, NiFe-based materials have proven to be excellent electrocatalysts for OER. Understanding the characteristics that affect OER activity and determining the OER mechanism are of vital importance for the development of OER electrocatalysts. Therefore, in situ characterization techniques performed under OER conditions are urgently needed to monitor the key intermediates together with identifying the OER active centers and phases. In this Minireview, recent advances regarding in situ techniques for the characterization of NiFe-based electrocatalysts are thoroughly summarized, including Raman spectroscopy, X-ray absorption spectroscopy, ambient pressure X-ray photoelectron spectroscopy, Mössbauer spectroscopy, Ultraviolet-visible spectroscopy, differential electrochemical mass spectrometry, and surface interrogation scanning electrochemical microscopy. The results from these in situ measurements not only reveal the structural transformation and the progressive oxidation of the catalytic species under OER conditions, but also disclose the crucial role of Ni and Fe during the OER. Finally, the need for developing new in situ techniques and theoretical investigations is discussed to better understand the OER mechanism and design promising OER electrocatalysts.

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Section: Introductionmentioning

confidence: 99%

Application of In Situ Techniques for the Characterization of NiFe‐Based Oxygen Evolution Reaction (OER) Electrocatalysts

2018

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“…Hence, the discovery of earth‐abundant, low‐cost, and high activity bifunctional electrocatalysts to achieve low energy‐intensive water electrolysis is still highly desired. A wide range of earth abundant catalytic materials with different morphologies, structure or loaded on various substrates have been developed for OER and HER, including transition metal oxides/hydroxides, carbides, and phosphides . Nevertheless, as stated in recent report, metal chalcogenides, nitrides, and phosphides are very sensitive in the strongly oxidizing OER conditions .…”

Section: Introductionmentioning

confidence: 99%

Ultrathin Porous NiFeV Ternary Layer Hydroxide Nanosheets as a Highly Efficient Bifunctional Electrocatalyst for Overall Water Splitting

Dinh

Zheng

Dai

et al. 2017

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Herein, the hydrothermal synthesis of porous ultrathin ternary NiFeV layer double hydroxides (LDHs) nanosheets grown on Nickel foam (NF) substrate as a highly efficient electrode toward overall water splitting in alkaline media is reported. The lateral size of the nanosheets is about a few hundreds of nanometers with the thickness of ≈10 nm. Among all molar ratios investigated, the Ni Fe V -LDHs/NF electrode depicts the optimized performance. It displays an excellent catalytic activity with a modest overpotential of 231 mV for the oxygen evolution reaction (OER) and 125 mV for the hydrogen evolution reaction (HER) in 1.0 m KOH electrolyte. Its exceptional activity is further shown in its small Tafel slope of 39.4 and 62.0 mV dec for OER and HER, respectively. More importantly, remarkable durability and stability are also observed. When used for overall water splitting, the Ni Fe V -LDHs/NF electrodes require a voltage of only 1.591 V to reach 10 mA cm in alkaline solution. These outstanding performances are mainly attributed to the synergistic effect of the ternary metal system that boosts the intrinsic catalytic activity and active surface area. This work explores a promising way to achieve the optimal inexpensive Ni-based hydroxide electrocatalyst for overall water splitting.

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“…To quantify the OER activity, it is important to compare the values of overpotential (η) required to achieve a current density of 10 mA cm −2 , which is always regarded as the benchmark to evaluate the activity of OER catalysts. [11,25,[42][43][44][45][46][47][48][49][50][51][52][53][54][55][56] Electrochemical impedance spectroscopy (EIS) could offer an opportunity to investigate the underlying factors of catalysts activity. Figure S20 (Supporting Information) shows the OER current density of the catalysts normalized by BET surface area.…”

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confidence: 99%

Eutectic‐Derived Mesoporous Ni‐Fe‐O Nanowire Network Catalyzing Oxygen Evolution and Overall Water Splitting

Dong

Kou

Gao

et al. 2017

Advanced Energy Materials

311

156

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The development of efficient and abundant water oxidation catalysts is essential for the large‐scale storage of renewable energy in the form of hydrogen fuel via electrolytic water splitting, but still remains challenging. Based upon eutectic reaction and dealloying inheritance effect, herein, novel Ni‐Fe‐O‐based composite with a unique mesoporous nanowire network structure is designed and synthesized. The composite exhibits exceptionally low overpotential (10 mA cm−2 at an overpotential of 244 mV), low Tafel slope (39 mV dec−1), and superior long‐term stability (remains 10 mA cm−2 for over 60 h without degradation) toward oxygen evolution reaction (OER) in 1 m KOH. Moreover, an alkaline water electrolyzer is constructed with the Ni‐Fe‐O composite as catalyst for both anode and cathode. This electrolyzer displays superior electrolysis performance (affording 10 mA cm−2 at 1.64 V) and long‐term durability. The remarkable features of the catalyst lie in its unique mesoporous nanowire network architecture and the synergistic effect of the metal core and the active metal oxide, giving rise to the strikingly enhanced active surface area, accelerated electron/ion transport, and further promoted reaction kinetics of OER.

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A layered Na_1−xNi_yFe_1−yO₂double oxide oxygen evolution reaction electrocatalyst for highly efficient water-splitting

Abstract: Novel layered Na1−xNiyFe1−yO2OER catalysts outperform IrO2, RuO2, and NiFe-LDH, reaching an 11.22% solar/H2efficiency for a perovskite solar cell.

Cited by 207 publications

References 52 publications

Application of In Situ Techniques for the Characterization of NiFe‐Based Oxygen Evolution Reaction (OER) Electrocatalysts

Application of In Situ Techniques for the Characterization of NiFe‐Based Oxygen Evolution Reaction (OER) Electrocatalysts

Ultrathin Porous NiFeV Ternary Layer Hydroxide Nanosheets as a Highly Efficient Bifunctional Electrocatalyst for Overall Water Splitting

Eutectic‐Derived Mesoporous Ni‐Fe‐O Nanowire Network Catalyzing Oxygen Evolution and Overall Water Splitting

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