Correction: Arbi et al. Polypyrrole-Assisted Ag Doping Strategy to Boost Co(OH)₂ Nanosheets on Ni Foam as a Novel Electrode for High-Performance Hybrid Supercapacitors. Nanomaterials 2022, 12, 3982

Error in Figures

In the original publication [1], there were mistakes in the Graphical Abstract, Figures 1 and 2, as published. The authors added the wrong SEM images to Figure 2 and, as a consequence, the SME images in Figure 1 and the Graphical Abstract were also incorrect. The corrected Graphical Abstract, Figure 1 and Figure 2 appear below.

Graphical Abstract

Figure 1. Schematic illustration of the synthesis of Ag-doped@Co(OH)₂@polypyrrole NSs.

Figure 1. Schematic illustration of the synthesis of Ag-doped@Co(OH)₂@polypyrrole NSs.

Figure 2. SEM images of the prepared Co(OH)₂ nanoparticles (a–c), Ag-doped@Co(OH)₂ nanoparticles (d–f), and Ag-doped@Co(OH)₂@polypyrrole NSs (g–i).

Figure 2. SEM images of the prepared Co(OH)₂ nanoparticles (a–c), Ag-doped@Co(OH)₂ nanoparticles (d–f), and Ag-doped@Co(OH)₂@polypyrrole NSs (g–i).

In the original publication [1], there were mistakes in Figure 4. The XRD patterns were erroneously added to Figure 4. The corrected Figure 4 appears below.

Text Correction

There was an error in the original publication [1]. Following the above error in Figure 4, a correction has been made to Section 3, Results and Discussion, Paragraph 4.

“The structure and phase purity of the prepared Ag-doped@Co(OH)₂ NPs and Ag-doped@Co(OH)₂@polypyrrole NSs were studied using the XRD technique, and the recorded XRD patterns are depicted in Figure 4a. From these XRD patterns, the Co(OH)₂ nanoparticles were shown to exhibit an amorphous behavior with very poor broad peaks at 2θ = 18°–35°. Contrastingly, the individual Ag-doped@Co(OH)₂ nanoparticles appeared to have a hexagonal crystal phase of Co(OH)₂ (JCPDS no. 30-0443) with diffraction angles of 19.4°, 32.6°, 37.8°, 57.7°, and 61.6° [34,35]. After developing Ag-doped particles onto the polypyrrole nanoparticles, the peaks of the Co(OH)₂ crystalline phases could still be seen in the XRD observation. After wearable polypyrrole particles were added on to Ag-doped@Co(OH)₂, new diffraction angles showing at 38.2°, 64.7°, and 77.54° matched well with the metallic cubic crystalline of Ag (JCPDS no. 65-2871) [36], proving the generation of PPy@Co(OH)₂@Ag NSs.”

The authors state that the scientific conclusions are unaffected. This correction was approved by the Academic Editor. The original publication has also been updated.