Two-Dimensional Mn-Co LDH/Graphene Composite towards High-Performance Water Splitting

Bao, Jian; Xie, Junfeng; Lei, Fengcai; Wang, Zhong Lin; Liu, Wenjun; Xu, Li; Guan, Meili; Zhao, Yan; Li, Huaming

doi:10.3390/catal8090350

Cited by 33 publications

(15 citation statements)

References 59 publications

(68 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Encouraged by the impressive performance of Mn‐Co‐P catalysts toward both HER and OER, we further investigated the activity of overall water splitting using MnCoP as both the cathode and anode. As shown in Figure a, this MnCoP pair affords a current density of 10 mA cm −2 at the voltage of 1.74 V. Although this value is a little higher than that of Pt/C||RuO 2 (1.55 V), it also compares to some materials reported, such as Mn‐Co LDH/graphene (≈1.7 V at 10 mA cm −2 ), Cu 0.3 Co 2.7 P/NC (1.74 V at 10 mA cm −2 ), and Co@Co 3 O 4 ‐NC (2 V at 10 mA cm −2 ) (see Table S3, Supporting Information) . The durability test indicates that the current density barely changes even after 24 h, indicating that the Mn‐Co‐P||Mn‐Co‐P electrolyzer exhibits exceptional stability toward overall water splitting (Figure b).…”

Section: Resultsmentioning

confidence: 72%

Rational Design of Manganese Cobalt Phosphide with Yolk–Shell Structure for Overall Water Splitting

et al. 2019

View full text Add to dashboard Cite

The development of low‐cost, earth‐abundant, and efficient catalysts for overall water splitting, involving the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), attracts tremendous attention in recent years. Herein, this work reports the preparation of Mn‐Co phosphide (Mn‐Co‐P) bifunctional catalysts with a yolk–shell structure by a facile hydrothermal route. The as‐prepared catalysts exhibit an excellent catalytic activity with the low overpotentials of 66 mV at 10 mA cm−2 for HER and 355 mV at 50 mA cm−2 for OER in 1 m KOH, along with an outstanding stability. More importantly, the cell voltage of 1.74 V can achieve a current density of 10 mA cm−2 when assembled as an electrolyzer for overall water splitting. Such superior performance makes the Mn‐Co‐P a promising candidate to replace Pt‐based noble metal catalysts for electrocatalytic applications.

show abstract

Section: Resultsmentioning

confidence: 72%

Rational Design of Manganese Cobalt Phosphide with Yolk–Shell Structure for Overall Water Splitting

et al. 2019

View full text Add to dashboard Cite

show abstract

“…60 [66] etched-CoFe-LDH [a] 302 41 [8] CoFe-LDH [a] 346 78 [8] MnCo-LDH/graphene [a] 330 48 [67] [a] Electrolyte:KOH (1.0 m).…”

Section: Oer Performancementioning

confidence: 99%

Holey Assembly of Two‐Dimensional Iron‐Doped Nickel‐Cobalt Layered Double Hydroxide Nanosheets for Energy Conversion Application

et al. 2019

View full text Add to dashboard Cite

Layered double hydroxides (LDHs) containing first‐row transition metals such as Fe, Co, and Ni have attracted significant interest for electrocatalysis owing to their abundance and excellent performance for the oxygen evolution reaction (OER) in alkaline media. Herein, the assembly of holey iron‐doped nickel‐cobalt layered double hydroxide (NiCo‐LDH) nanosheets (‘holey nanosheets’) is demonstrated by employing uniform Ni–Co glycerate spheres as self‐templates. Iron doping was found to increase the rate of hydrolysis of Ni–Co glycerate spheres and induce the formation of a holey interconnected sheet‐like structure with small pores (1–10 nm) and a high specific surface area (279 m2 g−1). The optimum Fe‐doped NiCo‐LDH OER catalyst showed a low overpotential of 285 mV at a current density of 10 mA cm−2 and a low Tafel slope of 62 mV dec−1. The enhanced OER activity was attributed to (i) the high specific surface area of the holey nanosheets, which increases the number of active sites, and (ii) the improved kinetics and enhanced ion transport arising from the iron doping and synergistic effects.

show abstract

“…The structure of the as-deposited Mn-Co films was characterised by interconnected nanoflakes uniformly deposited on the nickel substrate, forming a porous interconnected 3D network. The thin nanoflake structure was also observed for a chemically synthesised Mn-Co catalyst [44]. Such a morphology might support the fast transport of hydroxide ions (OH-) due to the easily accessible open spaces [30].…”

Section: Electrochemical Formation and Morphology Of Mn-co-based Oxidmentioning

confidence: 68%

“…Their overpotentials were determined to be 330 mV and 390 mV at 10 mA·cm −2 , respectively. Bao et al [ 44 ] introduced Mn-Co based LDH-graphene composite, which revealed an OER overpotential of 330 mV at 10 mA·cm −2 and showed superior bifunctional water splitting activity. In another work, (Co, Ni)Mn-LDH nanosheets were fabricated on multi-wall carbon nanotubes for efficient OER.…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Electrodeposition Parameters on the Properties of Mn-Co-Based Nanofilms as Anode Materials for Alkaline Electrolysers

et al. 2020

View full text Add to dashboard Cite

In this work, the influence of the synthesis conditions on the structure, morphology, and electrocatalytic performance for the oxygen evolution reaction (OER) of Mn-Co-based films is studied. For this purpose, Mn-Co nanofilm is electrochemically synthesised in a one-step process on nickel foam in the presence of metal nitrates without any additives. The possible mechanism of the synthesis is proposed. The morphology and structure of the catalysts are studied by various techniques including scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy. The analyses show that the as-deposited catalysts consist mainly of oxides/hydroxides and/or (oxy)hydroxides based on Mn2+, Co2+, and Co3+. The alkaline post-treatment of the film results in the formation of Mn-Co (oxy)hydroxides and crystalline Co(OH)2 with a β-phase hexagonal platelet-like shape structure, indicating a layered double hydroxide structure, desirable for the OER. Electrochemical studies show that the catalytic performance of Mn-Co was dependent on the concentration of Mn versus Co in the synthesis solution and on the deposition charge. The optimised Mn-Co/Ni foam is characterised by a specific surface area of 10.5 m2·g−1, a pore volume of 0.0042 cm3·g−1, and high electrochemical stability with an overpotential deviation around 330–340 mV at 10 mA·cm−2geo for 70 h.

show abstract

Two-Dimensional Mn-Co LDH/Graphene Composite towards High-Performance Water Splitting

Cited by 33 publications

References 59 publications

Rational Design of Manganese Cobalt Phosphide with Yolk–Shell Structure for Overall Water Splitting

Rational Design of Manganese Cobalt Phosphide with Yolk–Shell Structure for Overall Water Splitting

Holey Assembly of Two‐Dimensional Iron‐Doped Nickel‐Cobalt Layered Double Hydroxide Nanosheets for Energy Conversion Application

The Influence of the Electrodeposition Parameters on the Properties of Mn-Co-Based Nanofilms as Anode Materials for Alkaline Electrolysers

Contact Info

Product

Resources

About