Structural transformation of highly active metal–organic framework electrocatalysts during the oxygen evolution reaction

Zhao, Shenlong; Tan, Chunhui; He, Chun‐Ting; An, Pengfei; Xie, Feng; Jiang, Shuai; Zhu, Yanfei; Wu, Kuang‐Hsu; Zhang, Binwei; Li, Haijing; Zhang, Jing; Chen, Yuan; Liu, Shaoqin; Dong, Juncai; Tang, Zhiyong

doi:10.1038/s41560-020-00709-1

Cited by 734 publications

(505 citation statements)

References 59 publications

Supporting

Mentioning

471

Contrasting

Order By: Relevance

“…The stability of specific MOF catalytic systems for OER and HER varies significantly as a function of the organic ligands and their interaction with the metal cations. For instance, recent investigation of the MOF‐74 system for OER revealed (oxy)hydroxides as active sites, [ 17 ] while other MOF systems such as CoBDC–Fc–NF, [ 18 ] A 2.7 B‐MOF‐FeCo 1.6 , [ 19 ] and FeMOFs‐SO 3 [ 20 ] have been found to preserve their original structure during and/or post OER. To investigate the stability of our NiFe‐MOF/G catalyst surface we characterized the post‐OER composition of these sample by XPS, HRTEM, and Raman immediately after 10 h OER reaction (Figure S14, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Engineering the Activity and Stability of MOF‐Nanocomposites for Efficient Water Oxidation

Wang

Liu

Shen

et al. 2021

Advanced Energy Materials

130

View full text Add to dashboard Cite

Metal–organic frameworks (MOFs) are considered to be promising candidates for electrochemical water splitting. However, most MOFs are characterized by low electronic conductivity limiting their use as bulk materials for anodes and cathodes. Furthermore, the understanding of the critical parameters controlling the activity and stability of MOF electrocatalysts is still insufficient. Herein, a systematic analysis is presented of the key structural parameters controlling the oxygen evolution reaction (OER) performance and stability of a representative family of bimetallic NiFe‐MOFs, where the role of the metal cations on the accessible active sites and intrinsic activity can be investigated independently from the crystal structure. The models and in‐depth structural and morphological characterizations reveal a hierarchy of properties affecting the OER activity with accessible sites and intrinsic activity playing a major role in the charge transfer efficiency. Optimization of these properties and addition of a conductive support substrate leads to efficient MOF‐nanocomposite electrocatalysts achieving a low overpotential of 258 mV at a current density of 10 mA cm−2 with a small Tafel slope of 49 mV dec−1 and excellent stability for more than 32 h of continuous OER in alkaline medium.

show abstract

Section: Resultsmentioning

confidence: 99%

Engineering the Activity and Stability of MOF‐Nanocomposites for Efficient Water Oxidation

Wang

Liu

Shen

et al. 2021

Advanced Energy Materials

130

View full text Add to dashboard Cite

show abstract

“…In addition, molecular dinuclear metal sites have been incorporated into metal-organic frameworks (MOFs) (63,64). The continuous MOF-based structures grant the incorporated metal sites heterogeneous nature.…”

Section: Dinuclear Metal Centersmentioning

confidence: 99%

“…Note that the as-derived nanoparticles were metastable, which can be redecomposed or desorb during rinsing of the electrodes. Some metal complexes were even reported to have reversible structural transformation into metals or metal oxides/ hydroxides during catalysis (64,103). Therefore, identifying the structural decomposition of molecular might not be easy.…”

Section: Conclusion and Perspectivementioning

confidence: 99%

“…higher OER activity compared to either single Ni or Co center with a similar coordination environment. More recently, the authors(64) showed that the dinuclear Ni-Co center, embedded in MOF-74, underwent a reversible structural evolution during OER catalysis. Upon applying potentials, a dinuclear center was successively converted into hydroxide [Ni 0.5 Co 0.5 (OH) 2 ] before the redox potential of metal centers and oxyhydroxide carrying oxygen vacancy (V o •• -Ni 0.5 Co 0.5 OOH 0.75 ) after metal redox and at OER potentials.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Structural tuning of heterogeneous molecular catalysts for electrochemical energy conversion

2021

View full text Add to dashboard Cite

Heterogeneous molecular catalysts based on transition metal complexes have received increasing attention for their potential application in electrochemical energy conversion. The structural tuning of first and second coordination spheres of complexes provides versatile strategies for optimizing the activities of heterogeneous molecular catalysts and appropriate model systems for investigating the mechanism of structural variations on the activity. In this review, we first discuss the variation of first spheres by tuning ligated atoms; afterward, the structural tuning of second spheres by appending adjacent metal centers, pendant groups, electron withdrawing/donating, and conjugating moieties on the ligands is elaborated. Overall, these structural tuning resulted in different impacts on the geometric and electronic configurations of complexes, and the improved activity is achieved through tuning the stability of chemisorbed reactants and the redox behaviors of immobilized complexes.

show abstract

“…However, most MOFs display intrinsic poor electrocatalytic activity and electrical conductivity 74,75 . Thus, huge efforts have been spent on overcoming the barrier through the strategies like metal node engineering, introduce defects, and carbonization 76–85 . Among them, the introduction of defects has attracted considerable research attention because it can tune the electronic and surface properties, create open metal sites, and tune porosity.…”

Section: Introductionmentioning

confidence: 99%

Recent advances in vacancy engineering of metal‐organic frameworks and their derivatives for electrocatalysis

Gao

et al. 2021

SusMat

248

115

View full text Add to dashboard Cite

The efficient electrocatalysis plays the key role in the development of electrochemical energy conversion technologies to alleviate energy crisis. Given their multiple active sites and large specific surface areas as electrocatalysts, metalorganic frameworks (MOFs) and their derivatives have attracted considerable interests in recent years. Specially, exploring the roles of the enhanced active sites in MOFs and their derivatives is significant for understanding and developing new effective electrocatalysts. Recently, the vital role of vacancies has been proven to promote electrocatalytic processes (such as H 2 or O 2 evolution reactions, O 2 reduction reactions, and N 2 reduction reactions). In order to in-depth exploring the effect of vacancies in electrocatalysts, the vacancies classification, synthetic strategy, and the recent development of various vacancies in MOFs and their derivatives for electrocatalysis are reviewed. Also, the perspectives on the challenges and opportunities of vacancies in MOFs and their derivatives for electrocatalysis are presented.

show abstract

Structural transformation of highly active metal–organic framework electrocatalysts during the oxygen evolution reaction

Cited by 734 publications

References 59 publications

Engineering the Activity and Stability of MOF‐Nanocomposites for Efficient Water Oxidation

Engineering the Activity and Stability of MOF‐Nanocomposites for Efficient Water Oxidation

Structural tuning of heterogeneous molecular catalysts for electrochemical energy conversion

Recent advances in vacancy engineering of metal‐organic frameworks and their derivatives for electrocatalysis

Contact Info

Product

Resources

About