Pd/Ni-metal–organic framework-derived porous carbon nanosheets for efficient CO oxidation over a wide pH range

Abstract

Metal nanocrystals ornamented metal-organic framework (MOF) are of particular interest in multidisciplinary applications; however, their electrocatalytic CO oxidation performance over wide pH ranges is not yet reported. Herein, Ni-MOF-derived hierarchical...

Pt-Based Nanostructures for Electrochemical Oxidation of CO: Unveiling the Effect of Shapes and Electrolytes

“…Another possible factor is testing the EIS at the CO oxidation potential of each catalyst, which are all different, so the charge transfer across the electrolyte–electrode interface of each catalyst will not be similar and hence the obtained R s will be different. This is shown in the EIS results, which revealed semicircle lines, but with a smaller diameter for Pt NDs than Pt NCs and Pt/C, due to the morphology effect ( Figure 4 e) in line with elsewhere reports [ 24 , 25 ].…”

“…It can be seen that the reduction currents in N 2 ( Figure 3 a) and CO ( Figure 3 b) saturated electrolytes are not the same, due to the strong binding of CO to Pt results in a low surface coverage of OH which not decrease the accessible active sites but also reduce the oxidative removal of CO oxidation intermediates species and Pt-reduction. This leads to difference between the magnitude of both reduction currents as noticed before during CO oxidation on Pt-based or Pd-based catalysts [ 24 , 25 , 53 , 54 ]. The integrated CO oxidation charges from CV curves of Pt NDs, Pt NCs, and Pt/C in the forward scan are approximately 359.5, 160, and 151 μC, respectively, implying the superior CO ads ability of Pt NDs and Pt NCs than Pt/C.…”

“…The CO Oxid current density of PtPd/CNs nanorods (14.75 mA cm −2 ) was superior to Pt/C (7.32 mA cm −2 ) by 2.01 time and bare CNs (0.63 mA cm −2 ) by 23.41 time beside a lower oxidation/onset potential in 0.1 M KOH electrolyte [ 20 ]. Another solution is to use a supporting material, such as carbon-based materials (i.e., carbon nanotubes, carbon nitride [ 20 , 21 , 22 , 23 ], and metal-organic framework [ 24 , 25 ], supported metals nanoparticles and transition metal oxides (i.e., TiO 2 , Pd/Ti 3 C 2 , PdCu/CN, Fe 2 O 3 , and Ce 2 O 3 ) [ 26 , 27 , 28 , 29 ])), can enhance the CO Oxid performance of Pt-based catalysts [ 17 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ]. This is attributed to the enhanced electrical conductivity, abundant active sites, and electronic interaction with support, which strengthens the adsorption of reactants and facilitate the desorption of intermediates and products [ 40 , 41 , 42 , 43 , 44 ].…”

Non-Metal-Doped Porous Carbon Nitride Nanostructures for Photocatalytic Green Hydrogen Production

“… The relatively high overpotential, low current densities, and inferior long-term stability are critical barriers in gCNs for HERs, which cannot meet practical requirements (i.e., current density up to several ambers and durability for several weeks or months). This could be solved using noble metal dopants in the formation of heterojunction structures with porous metal oxynitride [ 165 , 166 ], multimetallic nanocrystals [ 12 , 167 , 168 ], MXenes [ 2 , 169 , 170 , 171 , 172 ], MOF [ 10 , 173 , 174 ], graphene [ 175 ], and graphdiyne [ 176 ] to augment solar light harvesting and charge carrier separation during the HER. The safety of H 2 storage tanks should be considered because in the case of unexpected accidents, the H 2 tank becomes a bomb.…”

Metal–organic framework-derived photoelectrochemical sensors: structural design and biosensing technology

“…[30][31][32][33] In particular, MOFs with a predictable arrangement have shown outstanding performance in detecting inorganic anions, heavy metal ions, and volatile organic compounds. [34][35][36][37] Based on the structuredetermined property, MOFs have been proven to bring about high selectivity, sensitivity, and reproducibility in constructing sensing devices. [38][39][40][41][42] The structure and composition of MOFs are closely correlated with the sensing performance parameters in terms of the limit of detection (LOD) and relative standard deviation (RSD) for stability and reproducibility.…”