Nitridation-induced metal–organic framework nanosheet for enhanced water oxidation electrocatalysis

Yao, Na; Jia, Hongnan; Fan, Zhengyin; Bai, Lu; Xie, Wei; Cong, Hengjiang; Chen, Shengli; Luo, Wei

doi:10.1016/j.jechem.2021.05.024

Cited by 29 publications

(15 citation statements)

References 47 publications

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“…Raman spectroscopy of CoCN and CoCuCN was further carried out to analyze structural information. Specifically, two distinct peaks at 1364 and 1585 cm –2 correspond to the disordered carbon and ordered graphitic carbon, respectively (Figure c) . The intensity ratio of the D band and G band ( I D / I G ) is an indicator to characterize the degree of graphitization for carbon materials.…”

Section: Resultsmentioning

confidence: 99%

“…Specifically, two distinct peaks at 1364 and 1585 cm −2 correspond to the disordered carbon and ordered graphitic carbon, respectively (Figure 6c). 44 45 which demonstrate heteroatom N and O doping. As seen from Figure S13, the N 1s spectrum is divided into three types of peaks, including graphitic N (401.3 eV), pyrrolic N (400.1 eV), and pyridinic N (398.8 eV).…”

Section: ■ Introductionmentioning

confidence: 99%

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Self-Dissociation-Oriented Growth of Ultrathin Metal–Organic Framework Nanosheet Arrays for Efficient Oxygen Evolution

Fan

Wang

et al. 2023

Crystal Growth & Design

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Metal−organic framework (MOF) ultrathin nanosheets have attracted widespread attention for the oxygen evolution reaction (OER) due to their ultralow thickness and abundant coordinatively unsaturated metal atoms. Here, we first develop an in situ self-dissociation-oriented growth strategy to grow welldefined ultrathin Co-MOF and CoCu-MOF nanosheet arrays on Ni foam. By merely altering the dosage of the ligands, controlled nucleation and orientation growth of MOFs led to confined metal atom growth sites and ultrathin MOF nanosheets with a thickness of only about 2.5 nm. Subsequent pyrolysis treatment in the N 2 atmosphere transforms the ultrathin 2D Co-MOF nanosheets into CoCN and CoCuCN electrocatalysts, which can be directly used as highly active OER electrodes. Remarkably, CoCN and CoCuCN exhibit excellent OER activity at low overpotentials of 231 and 196 mV to deliver a current density of 10 mA cm −2 and long-term stability with negligible decay even after 20 h continuous electrolysis, outperforming most state-of-the-art noble-metal-free and Co-based OER electrocatalysts to date. This study sheds light on the in situ self-dissociation-oriented growth strategy to achieve high-performance ultrathin MOF-based electrocatalysts and provides an advanced pathway to controllably fabricate other types of ultrathin MOF arrays uniformly.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Self-Dissociation-Oriented Growth of Ultrathin Metal–Organic Framework Nanosheet Arrays for Efficient Oxygen Evolution

Fan

Wang

et al. 2023

Crystal Growth & Design

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“…It should also be noted that the high OER, HER, and overall water splitting activity of the hierarchical CoP@Co‐Fe LDH 25s are comparable with or even better than those of reported highly promising catalysts (Tables S2‐S4). 48‐78 To the best of our knowledge, the hierarchical CoP@Co‐Fe LDH 25s is one of the best performing electrocatalysts thus far studied. It successfully meets the strict standards for the large‐scale commercialization of alkaline overall water splitting electrolyzers.…”

Section: Resultsmentioning

confidence: 99%

Rational design of hierarchical MOF ‐derived CoP @ Co‐Fe LDH bifunctional electrocatalyst: An approach toward efficient overall water splitting in alkaline media

Choi

Moon

Song

et al. 2022

Intl J of Energy Research

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Summary The electrodes that are inexpensive, had high catalytic activity, and can be easily produced in situ on a conductive substrate have been studied extensively to produce hydrogen through water splitting. Herein, a Co‐Fe layered double hydroxide (Co‐Fe LDH) and a metal‐organic framework (MOF)‐derived cobalt phosphide (CoP) are combined to fabricate a catalyst without any binders on a conductive carbon cloth (CC) that has abundant surface area and flexibility. The prepared electrode is then applied to the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) in 1 M KOH electrolyte and the overpotentials necessary to reach 10 mA/cm2 are 172 and 270 mV, respectively. Moreover, the Tafel slopes are 39 and 79 mV−1 for OER and HER, respectively, thereby outperforming Co‐Fe LDH and CoP individually. The potential needed to reach 10 mA/cm2 is 1.66 V in overall water splitting using the two‐electrode configuration. Notably, the catalytic activity is not degraded even after 50 hours of operation. Characterizations demonstrate that the combination of Co‐Fe LDH and CoP based on the catalyst and the strong coupling effect among the Co, Fe, and P active sites account for the excellent HER and OER performances. Our suggested in situ method represents a novel route for the preparation of hierarchical MOF‐derived CoP@Co‐Fe LDH (hierarchical CoP@Co‐Fe LDH) composite on conductive CC‐based high‐performance electrocatalysts for overall water splitting.

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“…Yao et al recently reported the synthesis of N-NiFe-MOF that was obtained through a postsynthetic nitridation process from NiFe-MOF , a BDC-based MOF that was obtained from a NiFe layered double hydroxide. During the nitridation, NH 3 coordinates to the open metal sites in NiFe-MOF to form N-NiFe-MOF , which is a precatalyst for the OER.…”

Section: Mof–catalyst Interactionsmentioning

confidence: 99%

Molecular Catalysis of Energy Relevance in Metal–Organic Frameworks: From Higher Coordination Sphere to System Effects

et al. 2023

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The modularity and synthetic flexibility of metal–organic frameworks (MOFs) have provoked analogies with enzymes, and even the term MOFzymes has been coined. In this review, we focus on molecular catalysis of energy relevance in MOFs, more specifically water oxidation, oxygen and carbon dioxide reduction, as well as hydrogen evolution in context of the MOF–enzyme analogy. Similar to enzymes, catalyst encapsulation in MOFs leads to structural stabilization under turnover conditions, while catalyst motifs that are synthetically out of reach in a homogeneous solution phase may be attainable as secondary building units in MOFs. Exploring the unique synthetic possibilities in MOFs, specific groups in the second and third coordination sphere around the catalytic active site have been incorporated to facilitate catalysis. A key difference between enzymes and MOFs is the fact that active site concentrations in the latter are often considerably higher, leading to charge and mass transport limitations in MOFs that are more severe than those in enzymes. High catalyst concentrations also put a limit on the distance between catalysts, and thus the available space for higher coordination sphere engineering. As transport is important for MOF-borne catalysis, a system perspective is chosen to highlight concepts that address the issue. A detailed section on transport and light-driven reactivity sets the stage for a concise review of the currently available literature on utilizing principles from Nature and system design for the preparation of catalytic MOF-based materials.

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Nitridation-induced metal–organic framework nanosheet for enhanced water oxidation electrocatalysis

Cited by 29 publications

References 47 publications

Self-Dissociation-Oriented Growth of Ultrathin Metal–Organic Framework Nanosheet Arrays for Efficient Oxygen Evolution

Self-Dissociation-Oriented Growth of Ultrathin Metal–Organic Framework Nanosheet Arrays for Efficient Oxygen Evolution

Rational design of hierarchical MOF ‐derived CoP @ Co‐Fe LDH bifunctional electrocatalyst: An approach toward efficient overall water splitting in alkaline media

Molecular Catalysis of Energy Relevance in Metal–Organic Frameworks: From Higher Coordination Sphere to System Effects

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