Electrocatalytic Enhancement of 0D/1D/2D Multidimensional PtCo Alloy@Cobalt Benzoate/Graphene Composite Catalyst for Alcohol Electro‐Oxidation

Abstract

PtCo alloy@cobalt benzoate/graphene (PtCo@Co‐BA/Gr) composite catalyst with 0D/1D/2D multidimensional structure is presented with simple solvothermal approach. As the introduced critical carrier, benzoic acid cobalt (II) (Co‐BA) has porous channels matching the size of platinum (Pt) nanoparticles and can enable PtCo alloy particles to be formed in its 1D mesopores through in situ reduction. Experiments indicate that the hydroxyl (OH) groups on the outer surface of Co‐BA are beneficial to form a strong interaction between Co‐BA and graphene. Compared with commercial Pt/C catalyst, the prepared PtCo@Co‐BA/Gr composite catalysts display an enlarged electrochemically active surface area, enhanced catalytic activity, and prolonged durability in acidic media toward the oxidation of various alcohols, such as methanol, ethanol, and ethylene glycol, which is mainly due to the increased surface area of PtCo by the confinement of mesoporous Co‐BA fiber, the promotion of water molecule dissociation of Co‐BA skeleton, and the improvement of conductivity by the introduction of graphene.

Quasihexagonal Platinum Nanodendrites Decorated over CoS2‐N‐Doped Reduced Graphene Oxide for Electro‐Oxidation of C1‐, C2‐, and C3‐Type Alcohols

“…The lowest Tafel slope was 55.52 mV dec –1 obtained for PtNDs@CoS 2 ‐NrGO. [ 15 ] On the other hand, Pt‐NrGO and Pt‐C showed values of 69.60 and 79.48 mV dec –1 , respectively. Figure 4f shows Nyquist plots for the electrochemical resistance evaluations of PtNDs@CoS 2 ‐NrGO, Pt‐NrGO, and Pt‐C in 1 m MeOH and 0.5 m H 2 SO 4 , where the obtained curves were fitted using the Randles method and exhibit values of 14.73, 16.73, and 15.51 Ω, respectively.…”

“…All of these factors, considered together, have significantly hampered the commercialization of AFCs. [ 15 ]…”

Electrocatalytic Properties of 3D Hierarchical Graphitic Carbon–Cobalt Nanoparticles for Urea Oxidation

“… 86 The electrocatalytic durability in 1000 s chronoamperometry of the modified electrode suggests high structure stability. 87 The stability of the modified electrode is tested using linear sweep voltammetry after consecutive cycles with a scan rate of 100 V s –1 in 1 M KOH and 0.4 M urea ( Figure 12 ). It can be seen that the anodic peak current intensity dropped sharply by about 43.76% after 100 cycles, and then, it decreased gradually.…”

Advanced Catalytic Materials for Ethanol Oxidation in Direct Ethanol Fuel Cells

“…Extensive efforts have been devoted to the development of binary Pt-based catalysts with reduced Pt loading or carefully controlled microstructures as well as the design of Pd-based and non-noble metal-based alternatives [13][14][15]. Bimetallic or trimetallic Pt-based alloys, such as PtSn [16], PtCu [17], PtCo [18], PtBi [19], and PtIrNi, [20] have emerged as promising electrocatalysts for EOR. Moreover, these Pt-based catalysts can mitigate the catalyst poisoning caused by the incomplete oxidation of C-C groups in ethanol.…”