2D Ti₃C₂Tx MXene-Supported Graphitic Carbon-Nitride-Decorated Co₃O₄ Nanoparticles as Efficient Catalysts for Oxygen Evolution Reaction

Abstract

Transition metal cobalt oxide (Co 3 O 4 ) with a typical spinel structure is considered a promising electrocatalyst for oxygen evolution reaction (OER). However, its OER catalytic performance is unsatisfactory owing to its limited activity. In this study, we demonstrate that using graphitic carbon nitride (g-C 3 N 4 ) loaded Co 3 O 4 nanoparticles and then anchoring them onto 2D Ti 3 C 2 Tx MXene with a layered structure can significantly enhance the OER catalytic performance. This performance may be due to the well-layered structure of g-C 3 N 4 , thereby enabling it to provide more attachment sites for Co 3 O 4 nanoparticles, reducing their agglomeration properties and exposing more active sites to promote OER catalytic performance. When anchoring Co 3 O 4 @g-C 3 N 4 on Ti 3 C 2 Tx MXene, solid-state interfacial interactions can adjust the structure of electrons and promote the rate of interfacial charge transfer, which enhances the conductivity of the catalyst and further promotes its OER catalytic performance. The overpotential required for TCN is 247 mV at a current density of 10 mA cm −2 , which is significantly lower than that of pure Ti 3 C 2 Tx MXene (600 mV) and Co 3 O 4 @g-C 3 N 4 (387 mV), in addition to exhibiting excellent electrochemical stability.

Utilization of CO2 for Electrocarboxylation of Benzophenone Using MXene-Based Electrodes: A Sustainable Approach

“…To understand the extent of catalytically active centers on the electrode surfaces available for the electrochemical reaction, the ECSA of MXene-modified and bare electrodes was calculated. 65 ECSA values were contemplated from the electrochemical C dl attained from the CV curves swept in a non-Faradaic potential range from −0.1 to −0.2 V at various scan rates between 0.04 and 0.14 V s −1 (Figure S8). 66,67 Figure 5c depicts the linear relation of the current density differences (at −0.15 V vs Ag/ AgCl) with scan rates.…”

Emerging two-dimensional materials: Synthesis, physical properties, and application for catalysis in energy conversion and storage

“…NiCo 2 O 4 ,174 ZnCo 2 O 4 ,174 Co 3 O 4 ,175 CoFeNiO x ),176 hydroxides (α-Ni(OH) 2 , 177 β-Ni(OH) 2 , defective Co(OH) 2 ),178 phosphorylated hydroxides (NiFe,179 CoZn,180 CoNi,180 CoFe 181 ), LDHs, 182 layered triple hydroxide (LTH),183 oxyhydroxides (γ-CoOOH),184 nitride (Ni 3 N),185 phosphides (Ni 8 P 3 , Cu 3 P, NiFeP, Fe-doped Ni 2 P),186 sulfides (NiS, Ni 3 S 2 , FeNiS 2 , Fe 7 S 8 ),187 selenides (NiSe 2 , [Ni 0.75 Fe 0.25 ]Se 2 ),188 thiophosphate (NiPS 3 @NiOOH core-shell heterostructure, Fe-doped NiPS 3 ),189 cobalt-based borate,190 amorphous Ni x B,191 and MOFs (NiCo bimetallic MOF,191 Co ZIF-9(III)) 191. Several of these non-noble metal catalysts surpass the performance of IrO2 and RuO 2 , which have overpotentials of 280 and 220 mV, respectively.…”