Oxygen defect-rich double-layer hierarchical porous Co3O4 arrays as high-efficient oxygen evolution catalyst for overall water splitting

One-step conversion of tannic acid-modified ZIF-67 into oxygen defect hollow Co3O4/nitrogen-doped carbon for efficient electrocatalytic oxygen evolution

“…10 Meanwhile, the O2 and O3 peaks at 531.0 and 532.6 eV are derived from surface oxygen defect species and absorbed oxygen species. 35,36 It should be highlighted that oxygen defects are present in O V -HCo 3 O 4 @NC. To further verify the existence of oxygen defects, as shown in Fig.…”

Interface Engineering of Needle‐Like P‐Doped MoS2/CoP Arrays as Highly Active and Durable Bifunctional Electrocatalyst for Overall Water Splitting

“…The exchange current density of P‐MoS 2 @CoP‐2 is 0.50 mA cm −2 was higher than most of the control catalysts, indicating faster electrode dynamics [14] . In addition, electrochemical impedance spectra (EIS) in Figure S8b showed that P‐MoS 2 @CoP‐2 has the lowest charge‐transfer resistance ( R ct ), suggesting an effective electron transfer between catalyst and electrolyte improving HER performance [25b,33] . The smallest R ct could result from the higher conductivity of P‐doped MoS 2 and the strong electronic interactions between the P‐MoS 2 and CoP species [34] …”

“…The two‐electrode water splitting study is a crucial standard to evaluate whether catalysts can be commercialized [25b] . We first tested the HER and OER performance of the optimized catalyst at high current density (Figure S20).…”

Defect Engineering of Carbon‐based Electrocatalysts for Rechargeable Zinc‐air Batteries

“…[89][90][91] The role of oxygen vacancies in the electrochemical performance of Co 3 O 4 has been extensively studied. [92][93][94][95][96] DFT calculations showed that oxygen vacancies produce a new defect state located in the bandgap of Co 3 O 4 , which easily excites two electrons in the defect state and leads to enhanced conductivity and superior electrochemical activity (Figure 9a). [97] Wang et al [94] developed a simple but effective plasma engraving strategy to produce Co 3 O 4 nanosheets with oxygen vacancies.…”

“…The assembly of TM compounds (e. g., oxides, alloys, hydroxides, sulfides, phosphates, nitrides, carbides, perovskites and spinels) on the heteroatoms‐doped carbon by chemical attachment and electrical coupling is another feasible way to introduce TM into carbon materials [68,88–108] . TM compounds have been widely reported as OER electrocatalysts [76,109] .…”