Efficient Co-MoS2 electrocatalyst for cathodic degradation of halogenated disinfection by-products in water sample

Dauda, Mohammed; Basheer, Chanbasha; Al-Malack, Muhammad H.; Siddiqui, Mohammad Nahid

doi:10.1016/j.seppur.2020.118085

Cited by 8 publications

(7 citation statements)

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“…The produced H 2 bubbles would inhibit the electrocatalytic sites and reduce the mass transfer of 2-CP toward Ni-P membranes, which resulted in an evident decline in dechlorination efficiency (30.9%) and reaction constant (1.070 min –1 ) at a cathodic potential of −3.00 V. Faradaic efficiency (FE) represents the current consumed for electrochemical reductive dechlorination to the current transferred in the electrical circuit. Electrocatalytic Ni-P membranes showed a FE of 6.12% at −2.00 V, a FE of 14.4% at −2.25 V, a FE of 24.5% at −2.50 V, a FE of 9.9% at −2.75 V, and a FE of 6.6% at −3.00 V (Figure C), additionally supporting the hypothesis that increasing electrical energy was spent in H 2 gas evolution at negative potentials greater than −2.50 V. The highest energy utilization efficiency was achieved under a cathodic potential of −2.50 V, with the maximum FE of 24.5%, comparable to noble-metal-free electrocatalysts’ FE ranging from 13% to 28% in electrochemical reductive dechlorination processes. − …”

Section: Resultssupporting

confidence: 72%

Electrically Conductive Ni-P Nanoporous Membrane Reactors for Electrochemical Reductive Dechlorination of Organic Pollutants

Zhang

Ganzoury

et al. 2023

ACS Appl. Nano Mater.

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Transition-metal phosphides (TMPs) are emerging electrocatalysts for both hydrogen evolution and the conversion of reactants/contaminants by various electrochemical reactions. TMPs are promising catalysts because they are earth abundant, have high electrical conductivity, and have high chemical stability. In this seminal work, a low-priced nickel phosphorus (Ni-P) ultrafiltration membrane was fabricated and used for electrochemical reductive dechlorination of chlorophenols. Amorphous Ni-P nanoparticles were grown on an ultrafiltration poly(ether sulfone) (PES) membrane via electroless deposition. The prepared Ni-P membrane was used as a cathode for electrochemical reductive dechlorination of 2-chlorophenol (2-CP) in flow-through mode. It was observed that a dechlorination efficiency of 42.7%, a reaction rate constant of 1.621 min–1, and a Faradaic efficiency of 24.5% were achieved at an optimized cathodic potential of −2.50 V. The dechlorination was primarily attributed to the partial positively charged Niδ+ on the Ni-P membrane surface, which facilitated atomic H* evolution by forming reactive Ni–H* bonds for dechlorination. Additionally, doping P atoms in Ni retarded the deactivation of electrocatalytic Ni sites. This work demonstrates that the cost-effective Ni-P membrane electrocatalyst is a promising technology to degrade chlorinated compounds with applications to industrial wastewaters and landfill leachates.

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Section: Resultssupporting

confidence: 72%

Electrically Conductive Ni-P Nanoporous Membrane Reactors for Electrochemical Reductive Dechlorination of Organic Pollutants

Zhang

Ganzoury

et al. 2023

ACS Appl. Nano Mater.

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“…The well spacing corresponding to CoS 2 was 2.46 Å, and that corresponding to MoS 2 was 3.05 Å. 33 By observing the results of the heterostructured CoS 2 /MoS 2 electrocatalyst energy-dispersive X-ray spectroscopy (EDX) mapping in Figure 1d, we could also see that Mo, Co, and S elements are evenly distributed throughout the nanosheet.…”

Section: Resultsmentioning

confidence: 89%

“…By observing the high-resolution transmission electron microscopy (HRTEM) image corresponding to the heterostructured CoS 2 /MoS 2 electrocatalyst (Figure c), we could clearly see the lattice fringe. The well spacing corresponding to CoS 2 was 2.46 Å, and that corresponding to MoS 2 was 3.05 Å . By observing the results of the heterostructured CoS 2 /MoS 2 electrocatalyst energy-dispersive X-ray spectroscopy (EDX) mapping in Figure d, we could also see that Mo, Co, and S elements are evenly distributed throughout the nanosheet.…”

Section: Resultsmentioning

confidence: 99%

Heterostructured CoS₂/MoS₂ with a Rich Active Site for an Efficient Electrochemical Nitrate Reduction Reaction to Ammonia

Tan,

Du,

Tong

et al. 2023

Energy Fuels

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The electrochemical nitrate reduction reaction (NO 3− RR) has an important application value in realizing efficient synthesis of ammonia (NH 3 ) from NO 3 − , and obtaining a highperformance and low-cost electrocatalyst is the key. Nonetheless, a majority of the existing catalysts for the NO 3 − RR have the problem of an unsatisfactory NH 3 yield and insufficient stability. Herein, a heterostructured CoS 2 /MoS 2 electrocatalyst is designed and fabricated, and the structure−activity relationship is studied. In comparison to pure CoS 2 and MoS 2 , CoS 2 /MoS 2 demonstrates an enhanced performance with 2.8 and 2.0 times the current enhancement, respectively, at an applied potential of −0.25 V versus reversible hydrogen electrode. It is found that the electronic structure of CoS 2 /MoS 2 is modified through electron transfer between Co and Mo for enhanced reaction dynamics. Moreover, in heterostructured CoS 2 /MoS 2 , the two components (CoS 2 and MoS 2 ) cooperate well with each other to tailor reaction steps of the NO 3 − RR. Eventually, CoS 2 /MoS 2 achieves a faradaic efficiency of 97.07%, NH 3 yield rate of 0.44 mmol h −1 cm −2 , NO 3 − conversion rate of 75.43%, and NH 3 selectivity of 95.45% in a 1.0 M KOH electrolyte with 600 ppm of NO 3 − -N, retaining its promising applications in the NO 3 − RR.

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“…A detailed material characterization of the prepared Co-MoS 2 -GF electrode can be found in our previously published work [17]. However, we provide a brief description of the salient features of the electrode in the following paragraphs.…”

Section: Materials Characterizationmentioning

confidence: 99%

“…The quest for effective, low-cost electrocatalysts for reductive water treatment has seen the emergence of several transition metals and their composites as electrodes with comparable catalytic properties to those of precious metals. Recent studies have demonstrated the excellent catalytic properties [17][18][19][20] of Co-doped MoS 2 for H* formation, which can effectively be used to reduce organochloride. It was reported that the hybridized CoSx and MoS 2 formed during the Co doping of MoS 2 (Co-MoS 2 ) leads to the formation of catalytic active surface edge sites that enable the accelerated surface-bound H* formation [19].…”

Section: Introductionmentioning

confidence: 99%

Degradation Kinetics and Mechanism of Polychloromethanes Reduction at Co-MoS2/Graphite Felt Electrode

et al. 2021

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In this study, the electrochemical dechlorination of different polychloromethanes (CCl4, CHCl3, and CH2Cl2) on a Co-MoS2 graphite felt cathode was investigated. The Co-MoS2 electrocatalyst was prepared hydrothermally on a graphite felt support. The prepared catalyst’s characterization revealed the formation of hybridized CoSx and MoS2 nanosheets deposited on the pore structures of graphite. The influencing factor for the electro-dechlorination parameters such as applied current density, pH, and sample concentration on the dechlorination rate was optimized. A significant capacitive reduction current density peak of approximately 1 mA/cm2 was noted for CCl4 at a potential of −0.3 V (vs. AgCl). The dechlorination mechanism was attributed to the stepwise hydrogenolysis mechanism that involves the organochlorides bond cleavage by H* insertion. It was noted that the Co-MoS2 graphite felt electrode exhibited excellent catalytic activity toward the reduction of each of the chlorinated compounds with high selectivity toward the higher-order organochloride. Moreover, the dechlorination rates for each of the compounds were suited to the first-order kinetic model, and the estimated apparent rate constants showed the dechlorination in the following sequence CH2Cl2 (k3 = 9.1 × 10−5 s−1) < CHCl3 (k2 = 1.5 × 10−3 s−1) < CCl4 (k1 = 2.8 × 10−3 s−1).

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Efficient Co-MoS2 electrocatalyst for cathodic degradation of halogenated disinfection by-products in water sample

Cited by 8 publications

References 50 publications

Electrically Conductive Ni-P Nanoporous Membrane Reactors for Electrochemical Reductive Dechlorination of Organic Pollutants

Electrically Conductive Ni-P Nanoporous Membrane Reactors for Electrochemical Reductive Dechlorination of Organic Pollutants

Heterostructured CoS₂/MoS₂ with a Rich Active Site for an Efficient Electrochemical Nitrate Reduction Reaction to Ammonia

Degradation Kinetics and Mechanism of Polychloromethanes Reduction at Co-MoS2/Graphite Felt Electrode

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Efficient Co-MoS2 electrocatalyst for cathodic degradation of halogenated disinfection by-products in water sample

Cited by 8 publications

References 50 publications

Electrically Conductive Ni-P Nanoporous Membrane Reactors for Electrochemical Reductive Dechlorination of Organic Pollutants

Electrically Conductive Ni-P Nanoporous Membrane Reactors for Electrochemical Reductive Dechlorination of Organic Pollutants

Heterostructured CoS2/MoS2 with a Rich Active Site for an Efficient Electrochemical Nitrate Reduction Reaction to Ammonia

Degradation Kinetics and Mechanism of Polychloromethanes Reduction at Co-MoS2/Graphite Felt Electrode

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Heterostructured CoS₂/MoS₂ with a Rich Active Site for an Efficient Electrochemical Nitrate Reduction Reaction to Ammonia