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      Oxalate metal–organic framework derived atomic Ru 3+-doped Co(OH) 2nanosheets for a highly efficient hydrogen evolution reaction

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          Abstract

          Oxalate metal–organic framework derived atomic Ru 3+-doped Co(OH) 2nanosheets are fabricated for highly efficient hydrogen evolution reaction, showing a very small overpotential of 36 mV at 30 mA cm −2in 1.0 M KOH.

          Abstract

          Atomic Ru-doped cobalt hydroxides (Ru-Co(OH) 2) are prepared from atomic Ru-doped oxalate metal–organic frameworks. There is a strong electronic interaction between Co and Ru atoms. In addition, the incorporation of Ru 3+favors the formation of well-defined two-dimensional nanosheets and thus greatly increased the electrochemically active surface area of the catalyst. The as-prepared Ru-Co(OH) 2with a Ru mass loading of 5.1 wt% exhibits the highest intrinsic activity and the best catalytic performance towards the hydrogen evolution reaction, showing a very small overpotential of 36 mV at 30 mA cm −2in 1.0 M KOH, which surpasses that of the Pt/C catalyst.

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          Boosting oxygen evolution of single-atomic ruthenium through electronic coupling with cobalt-iron layered double hydroxides

          Pengsong Li, Maoyu Wang, Xinxuan Duan … (2019)
          Single atom catalyst, which contains isolated metal atoms singly dispersed on supports, has great potential for achieving high activity and selectivity in hetero-catalysis and electrocatalysis. However, the activity and stability of single atoms and their interaction with support still remains a mystery. Here we show a stable single atomic ruthenium catalyst anchoring on the surface of cobalt iron layered double hydroxides, which possesses a strong electronic coupling between ruthenium and layered double hydroxides. With 0.45 wt.% ruthenium loading, the catalyst exhibits outstanding activity with overpotential 198 mV at the current density of 10 mA cm−2 and a small Tafel slope of 39 mV dec−1 for oxygen evolution reaction. By using operando X-ray absorption spectroscopy, it is disclosed that the isolated single atom ruthenium was kept under the oxidation states of 4+ even at high overpotential due to synergetic electron coupling, which endow exceptional electrocatalytic activity and stability simultaneously.
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            In Situ Transformation of MOFs into Layered Double Hydroxide Embedded Metal Sulfides for Improved Electrocatalytic and Supercapacitive Performance.

            Gamze Yilmaz, Kah Meng Yam, Chun Lan Zhang … (2017)
            Direct adoption of metal-organic frameworks (MOFs) as electrode materials shows impoverished electrochemical performance owing to low electrical conductivity and poor chemical stability. In this study, we demonstrate self-templated pseudomorphic transformation of MOF into surface chemistry rich hollow framework that delivers highly reactive, durable, and universal electrochemically active energy conversion and storage functionalities. In situ pseudomorphic transformation of MOF-derived hollow rhombic dodecahedron template and sulfurization of nickel cobalt layered double hydroxides (NiCo-LDHs) lead to the construction of interlayered metal sulfides (NiCo-LDH/Co9 S8 ) system. The embedment of metal sulfide species (Co9 S8 ) at the LDH intergalleries offers optimal interfacing of the hybrid constituent elements and materials stability. The hybrid NiCo-LDH/Co9 S8 system collectively presents an ideal porous structure, rich redox chemistry, and high electrical conductivity matrix. This leads to a significant enhancement in its complementary electrocatalytic hydrogen evolution and supercapacitive energy storage properties. This work establishes the potential of MOF derived scaffold for designing of novel class hybrid inorganic-organic functional materials for electrochemical applications and beyond.
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              Modulating electronic structure of metal-organic frameworks by introducing atomically dispersed Ru for efficient hydrogen evolution

              Yamei Sun, Ziqian Xue, Qinglin Liu … (2021)
              Developing high-performance electrocatalysts toward hydrogen evolution reaction is important for clean and sustainable hydrogen energy, yet still challenging. Herein, we report a single-atom strategy to construct excellent metal-organic frameworks (MOFs) hydrogen evolution reaction electrocatalyst (NiRu0.13-BDC) by introducing atomically dispersed Ru. Significantly, the obtained NiRu0.13-BDC exhibits outstanding hydrogen evolution activity in all pH, especially with a low overpotential of 36 mV at a current density of 10 mA cm−2 in 1 M phosphate buffered saline solution, which is comparable to commercial Pt/C. X-ray absorption fine structures and the density functional theory calculations reveal that introducing Ru single-atom can modulate electronic structure of metal center in the MOF, leading to the optimization of binding strength for H2O and H*, and the enhancement of HER performance. This work establishes single-atom strategy as an efficient approach to modulate electronic structure of MOFs for catalyst design.
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                Author and article information

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                Journal
                Journal ID (publisher-id): SEFUA7
                Title: Sustainable Energy & Fuels
                Abbreviated Title: Sustainable Energy Fuels
                Publisher: Royal Society of Chemistry (RSC)
                ISSN (Electronic): 2398-4902
                Publication date Created: February 14 2023
                Publication date (Electronic): 2023
                Volume: 7
                Issue: 4
                Pages: 928-933
                Affiliations
                [1 ]Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, P. R. China
                [2 ]Department of Materials, ETH Zürich, Zürich 8093, Switzerland
                [3 ]School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, P. R. China
                Article
                DOI: 10.1039/D2SE01664H
                SO-VID: f7f82bec-8a67-4efb-8aa2-acaa83231714
                Copyright © © 2023
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                http://rsc.li/journals-terms-of-use

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