Tailoring the d-band center of porous CoS2 nanospheres via low-electronegative Fe for weakened OH* adsorption and boosted oxygen evolution
Heyuan Chen,
Wei Wu,
Suhao Chen
et al.
Abstract:The development of high-performance metallic cobalt pyrite OER catalysts with suitable electronic structures remains a challenge. In this paper, a low-electronegative Fe substituted cobalt pyrite (FexCo1-x)S2 OER catalyst with controllable...
“…Therefore, the introduction of CNTs changes the electronic structure and there are more carriers attached to the Fermi level, which is beneficial for the reduction of the electron transfer barrier. 75 The effect of CNTs on the band gap of CuCoO 2 was further verified by ultraviolet-visible-near infrared (UV-vis-NIR) absorption spectra (Fig. S22a†).…”
In this study, carboxylated multi-walled carbon nanotubes (CNT) were utilized to address the challenges of inherent conductivity mismatch of CuCoO2 catalysts. CNT-supported CuCoO2 nanosheets (CCO/xCNT, x = 25, 50, and...
“…Therefore, the introduction of CNTs changes the electronic structure and there are more carriers attached to the Fermi level, which is beneficial for the reduction of the electron transfer barrier. 75 The effect of CNTs on the band gap of CuCoO 2 was further verified by ultraviolet-visible-near infrared (UV-vis-NIR) absorption spectra (Fig. S22a†).…”
In this study, carboxylated multi-walled carbon nanotubes (CNT) were utilized to address the challenges of inherent conductivity mismatch of CuCoO2 catalysts. CNT-supported CuCoO2 nanosheets (CCO/xCNT, x = 25, 50, and...
“…That is, the bimetallic heterostructure CoS 2 /MoS 2 nanosheets covered on CC can elevate the oxygen evolution activity of electrocatalysts. The electrochemical active surface area (ECSA) of the electrocatalyst, which was linearly related to the electrochemical double-layer capacitance (C dl ), 64 was then measured using the cyclic voltammetry (CV) curves under varied scan rates (Figure S5). As illustrated in Figure 4d, the CC, CC@ZIF-67, CC@MoS 2 , CC@RuO 2 , CC@CoS 2 , and CC@CoS 2 /MoS 2 respectively show C dl values of 1.33, 2.05, 2.24, 2.25, 2.46, and 2.57 mF cm −2 , verifying that CC@CoS 2 /MoS 2 can provide more surface catalytic active sites in the OER.…”
Cost-effective and earth-abundant oxygen evolution reaction (OER) electrocatalysts are an incredible research hotspot in numerous energy storage and conversion technology fields. Herein, CoS 2 /MoS 2 nanosheets supported by carbon cloth as a dual-active CC@CoS 2 /MoS 2 heterostructure electrocatalyst is prepared through a simple solvothermal method. The catalyst demonstrates admirable OER performance in 1 M KOH solution with a low overpotential of 243 mV at a current density of 10 mA cm −2 and a minor Tafel slope of 109 mV dec −1 , displaying honorable stability after 1000 cyclic voltammetry (CV) cycles and long-term robustness over 60 h. Theoretical calculations further ascertain that the rate-determining step of the electrocatalytic course of the CC@CoS 2 /MoS 2 heterostructure is the conversion *O + OH − → *OOH + e − with a lower energy barrier of 1.49 eV due to the heterojunction established by CoS 2 and MoS 2 , which can promote the OER performance of electrocatalysts. The actual identification of the catalytic mechanism in the heterostructure is conducive to the improvement of electrocatalysis applications in the OER.
“…The boron possesses a lower electronegativity (2.04) than phosphorus (2.19), which can induce charge accumulation at the Ni and Co sites, facilitating redox reactions and improving the pseudocapacitive contribution. 16 Furthermore, the smaller atomic radius of boron (0.85 Å) compared to phosphorus (1.00 Å) enables facile doping into the NiCoP lattice. In addition, the defect formation energies calculated using DFT for substitutional and interstitial doping of boron into NiCoP are displayed in Fig.…”
A hybrid supercapacitor (B-NiCoP-CC-18||AC HSC) with excellent energy density (73.22 W h kg−1), power density (963.8 W kg−1), and cycling stability (a capacity retention of 90% after 5000 cycles).
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