Synthesis of ultrathin Co2AlO4 nanosheets with oxygen vacancies for enhanced electrocatalytic oxygen evolution

Wang, Jiayang; Shen, Yongli; Wei, Guijuan; Xi, Wei; Ma, Xiaoming; Zhang, Weiqing; Zhu, Peipei; An, Changhua

doi:10.1007/s40843-019-9490-x

Cited by 19 publications

(17 citation statements)

References 55 publications

(58 reference statements)

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“…Synthesis of oxygen vacancy‐rich Co 2 AlO 4 nanosheets via solvothermal approach was successfully achieved by Wang et al., [30] by treating pristine Co 2 AlO 4 nanosheets in a solution of sodium hydroxide (NaOH) and ethylene glycol at 140 °C for 12 h. The reduced Co 2 AlO 4 exhibited a higher surface area (54.1 m 2 g −1 ) compared to pristine Co 2 AlO 4 (31.6 m 2 g −1 ). implying the availability of more active sites for OER.…”

Section: Strategies For Preparing Oxygen‐deficient Metal Oxidesmentioning

confidence: 99%

Oxygen‐Deficient Cobalt‐Based Oxides for Electrocatalytic Water Splitting

2020

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An apparent increased interest has been recently devoted towards the previously untrodden path for anionic point defect engineering of electrocatalytic surfaces. The role of vacancy engineering in improving photo‐ and electrocatalytic activities of transition metal oxides (TMOs) has been widely reported. In particular, oxygen vacancy modulation on electrocatalysts of cobalt‐based TMOs has seen a fresh spike of research work due to the substantial improvements they have shown towards oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Oxygen vacancy engineering is an effective scheme to quintessentially tune the electronic structure and charge transport, generate secondary active surface phases, and modify the surface adsorption/desorption behavior of reaction intermediates during water splitting. Based on contemporary efforts for inducing oxygen vacancies in a variety of cobalt oxide types, this work addresses facile and environmentally benign synthesis strategies, characterization techniques, and detailed insight into the intrinsic mechanistic modulation of electrocatalysts. It is our foresight that appropriate utilization of the principles discussed herein will aid researchers in rationally designing novel materials that can outperform noble metal‐based electrocatalysts. Ultimately, future electrocatalysis implementation for selective seawater splitting is believed to depend on regulating the surface chemistry of active and stable TMOs.

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Section: Strategies For Preparing Oxygen‐deficient Metal Oxidesmentioning

confidence: 99%

Oxygen‐Deficient Cobalt‐Based Oxides for Electrocatalytic Water Splitting

2020

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“…The Ni@NiO@C demonstrated an over‐potential value of 380 mV with current density of 10 mA cm −2 . The Co 2 AlO 4 nanosheet on the other hand had a value of 280 mV at the current density of 10 mA cm −2 and a small Tafel slope of 70.98 mV decade −1 . In comparison to the signal transition metal oxide, the multi transition‐metal oxides have shown more superior performance based on their inherent bond formation ability and open coordination sites.…”

Section: Electro‐catalysts For Oxygen Evolution Reaction (Oer)mentioning

confidence: 99%

Recent Advances in Non‐Precious Metal‐Based Electrodes for Alkaline Water Electrolysis

Zhou

et al. 2020

ChemNanoMat

116

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Hydrogen gas has been regarded as an ideal energy source that could replace the need of fossil fuels, based on its high energy density with zero carbon emissions. The production of hydrogen via electrolysis of water is not a new field, but the technology has seen significant advancements in recent times, owing to the proportional growing demand of clean and affordable energy. This review discusses the most recent progresses achieved in the area of earth abundant catalysis, particularly, non‐precious metal (Ni, Co, Fe, Mo, W)‐based catalysts that are being utilized for the electrochemical hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline solutions. Based on the type of materials, the discussions are categorized into sections attributed to transition metal alloys, hydroxides, oxides, chalcogenides, carbides and nitrogenous materials. In general, a brief introduction of HER and OER mechanisms followed by a detailed discussion of the presently considered catalysts with endeavors have been made to highlight the new technologies and alternative approaches that are being considered promising towards production of clean H2 energy. Finally, a prospective has been provided to accentuate the future of non‐noble metal based catalyst in electro‐catalytic water splitting reactions.

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“…Two half-reactions are involved in the process: the hydrogen evolution reaction (HER) at cathode and oxygen evolution reaction (OER) at anode [7][8][9]. The key to exploring efficient electrocatalysts is reduction of overpotential and enhancement of catalytic efficiency [10][11][12]. Noble metals such as Pt-based and Ru/Ir-based materials have been used as robust electrocatalysts for HER and OER, respectively [13,14].…”

Section: Introductionmentioning

confidence: 99%

FeNi nanoparticles on Mo2TiC2Tx MXene@nickel foam as robust electrocatalysts for overall water splitting

Wang

Shen

et al. 2021

Nano Res.

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The development of cost-effective electrocatalysts for overall water splitting is highly desirable, remaining a critical challenge at current stage. Herein, a class of composite FeNi@MXene (Mo 2 TiC 2 T x )@nickel foam (NF) has been synthesized through introducing Fe 2+ ions and in-situ combining with surface nickel atoms on nickel foam. The obtained FeNi@Mo 2 TiC 2 T x @NF exhibited high activity with overpotentials of 165 and 190 mV for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) at a current density of 10 mA•cm −2 , respectively. The synergetic effects of Mo 2 TiC 2 T x and FeNi nanoalloys lead to increasing catalytic activities, where MXene provides high active surface area and rich active sites for HER, and FeNi nanoalloys promote the OER. Theoretical simulation of electron exchange capacity between FeNi and MXene in FeNi@Mo 2 TiC 2 T x catalyst shows that electrons transferred from surface Mo atoms to the interface between FeNi and MXene, indicating that the electrons are accumulated near the FeNi nanoparticles. This kind of electronic distribution facilitates the formation of intermediate of NiOOH. Correspondingly, (H + + e − ) is more inclined onto Mo-Ni interfaces for HER. The Gibbs free energy changes for H* to HER and potential-limiting step for −OOH intermediate in OER over FeNi@Mo 2 TiC 2 T x are much less than those on bare MXene. The catalyst can be further used for overall water splitting in alkaline solution, realizing a current density of 50 mA•cm −2 at 1.74 V. This work provides a facile strategy to achieve efficient and cheap catalysts for new energy production.

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Synthesis of ultrathin Co2AlO4 nanosheets with oxygen vacancies for enhanced electrocatalytic oxygen evolution

Cited by 19 publications

References 55 publications

Oxygen‐Deficient Cobalt‐Based Oxides for Electrocatalytic Water Splitting

Oxygen‐Deficient Cobalt‐Based Oxides for Electrocatalytic Water Splitting

Recent Advances in Non‐Precious Metal‐Based Electrodes for Alkaline Water Electrolysis

FeNi nanoparticles on Mo2TiC2Tx MXene@nickel foam as robust electrocatalysts for overall water splitting

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