Solvothermal synthesis of CuCoO₂ nanoplates using zeolitic imidazolate framework-67 (ZIF-67) as a co-derived precursor

Abstract

CuCoO2 nanoplates were prepared through the solvothermal method at 140 °C using ZIF-67 as the Co precursor for the first time.

Metal–organic framework derived bimetal oxide CuCoO2 as efficient electrocatalyst for the oxygen evolution reaction

“…† ZIF-67 was prepared according to a published method. 43 The X-ray diffraction (XRD) pattern of the ZIF-67 in Fig. S1a † matched well with the previous literature.…”

“…We have prepared CCO nanoplates (∼150 nm) by the solvothermal method at 140 °C using a zeolitic imidazolate framework-67 (ZIF-67) as the Co precursor. 43 Obviously, it is of great significance to obtain a comprehensive understanding of the crystal growth and catalytic mechanism of MOF-derived delafossite oxides.…”

Surfactant-Modified Hydrothermal Synthesis of Ca-Doped CuCoO2 Nanosheets with Abundant Active Sites for Enhanced Electrocatalytic Oxygen Evolution

“…The hydrothermally synthesized CuGaO 2 nanoflakes in combination of surfactant sodium dodecyl sulfate at certain concentrations were demonstrated to possess better (photo)­electrocatalytic performance and stability for OER than the CuGaO 2 microplates . The CuCoO 2 crystals with a rhombohedra (3R) symmetry have previously been synthesized by several preparation methods such as a conventional hydrothermal method, − a traditional solid-state ion-exchange technique, , and a novel solvothermal strategy . But the particle size of CuCoO 2 synthesized in the conventional pathways was always around micron-sized which has largely limited its electrochemical application.…”

“…18 The CuCoO 2 crystals with a rhombohedra (3R) symmetry 19 have previously been synthesized by several preparation methods such as a conventional hydrothermal method, 20−22 tional solid-state ion-exchange technique, 23,24 and a novel solvothermal strategy. 25 But the particle size of CuCoO 2 synthesized in the conventional pathways was always around micron-sized which has largely limited its electrochemical application. We already reported a surfactant-assisted hydrothermal synthesis of pure CuCoO 2 nanoplates, which showed comparatively fast OER kinetics and good long-term OER stability in 1.0 M KOH.…”

“…32 The electrochemically active surface area (ECSA) plays a major role for assessing the amounts of surface active sites of catalysts, and the ECSA is positively proportional to the electrochemical double-layer capacitance (C dl ). 26 In the nonfaradaic potential region (ranges from −0.05 to 0.05 V vs SCE) at different scan rates (i.e., 20, 40, 60, 80, 100 mV/ s), 25 the C dl values of all CCCO-P NSs were calculated from CV curves (Figures S7−S9). Figure 5d displays the C dl values of Ni@CCCO-P1, -P2, and -P3 electrodes as 5.6, 7.0, and 5.3 mF cm −2 , respectively.…”