ATMP derived cobalt-metaphosphate complex as highly active catalyst for oxygen reduction reaction

Abstract

Rational design and facile synthesis of highly active electrocatalysts with low cost for oxygen reduction reaction (ORR) are always of great challenge. Specifically, development of a new type of energy-saving materials with convenient method is regarded as the current bottleneck. Herein, an innovative strategy based on amino trimethylene phosphonic acid (ATMP) as chelating agent for cobalt-metaphosphate coordination polymer is reported to one-pot synthesis of a novel precursor in methanol for ORR electrocatalyst. Carbonization of the precursor at 900 o C at N 2 atmosphere results in the feasible formation of cobalt metaphosphate based composite (Co(PO 3) 2 /NC). A further step in the thermal cleavage at 650 o C at air for 4h, Co(PO 3) 2 /NC can be finally transformed into inorganic Co(PO 3) 2. Advanced spectroscopic techniques and density function theory (DFT) calculations are applied to confirm the main catalytically active center and the physical properties of Co(PO 3) 2 /NC. This obtained Co(PO 3) 2 /NC nanocomposite exhibits superior electrocatalysis to Co(PO 3) 2 with an enhanced onset potential (0.906 V vs. RHE) and diffusion limiting current (5.062 mA cm-2), which are roughly close to those of commercial 20 % Pt/C (0.916 V, 5.200 mA cm-2).

Amorphous CoV Phosphate Nanosheets as Efficient Oxygen Evolution Electrocatalyst

“…Obviously, the peak at 1037 cm À 1 indicates the vibration of P=O bond, which proves the existence of phosphate groups. [30] The peak at 806 cm À 1 is attributed to VÀ OÀ H. [31] The two peaks at 669 and 584 cm À 1 are due to the formation of CoÀ O. [32] The results of FT-IR further demonstrate that the composition of CoVÀ Pi catalyst is CoV phosphate, CoVÀ O catalyst is CoV oxides, CoÀ Pi catalyst is Co phosphate, and Co 3 O 4 is in agreement with the previous literature reports.…”

Insight into the Active Contribution of N-Coordinated Cobalt Phosphate Nanocrystals Coupled with Carbon Nanotubes for Oxygen Electrochemistry

“…For instance, phosphonate-based MOF derived cobalt phosphate on N-doped graphitic carbons exhibit high activity for OER, even approaching to that of the noble-metal counterpart, and the distorted metal coordination geometry with large Co–Co and Co–O distance is considered as the main reason for impressive OER activity . In addition, the Co­(PO 3 ) 2 nanoparticle loaded N-doped carbons by using amino trimethylene phosphonic acid (ATMP) as the chelating agent was developed for the highly efficient ORR process; the theoretical calculation confirms that the synergistic effect between the N-doped carbon layer, and Co­(PO 3 ) 2 contributes to the ORR process . These experimental achievements reveal the feasibility of those transition metal phosphonate-based material derived metal phosphates to design active OER or ORR electrocatalysts.…”

“…15 In addition, the Co(PO 3 ) 2 nanoparticle loaded N-doped carbons by using amino trimethylene phosphonic acid (ATMP) as the chelating agent was developed for the highly efficient ORR process; the theoretical calculation confirms that the synergistic effect between the N-doped carbon layer, and Co(PO 3 ) 2 contributes to the ORR process. 16 These experimental achievements reveal the feasibility of those transition metal phosphonate-based material derived metal phosphates to design active OER or ORR electrocatalysts. However, there are still no direct experimental attempts to prove the real active species of such metal phosphate−carbon hybrid materials for ORR process.…”

Cobalt Phosphide (Co2P) with Notable Electrocatalytic Activity Designed for Sensitive and Selective Enzymeless Bioanalysis of Hydrogen Peroxide

“…The preparation method of Co(PO 3 ) 2 was referred to the previous report [ 35 ]. 0.1 M CoCl 2 ·6H 2 O methanol solution was prepared firstly.…”