Bimetallic Ni–Mo nitride nanotubes as highly active and stable bifunctional electrocatalysts for full water splitting

Yin, Zhuoxun; Sun, Yunjuan; Zhu, Chunling; Li, Chunyan; Zhang, Xitian; Chen, Yujin

doi:10.1039/c7ta02876h

Cited by 198 publications

(116 citation statements)

References 74 publications

Supporting

Mentioning

106

Contrasting

Unclassified

Order By: Relevance

“…The peaks located at 402.1, 398.9 and 379.5 eV can be assigned to graphitic N, pyrrolic N and pyridinic N, respectively. The peak at 395.6 eV is the typical BE of N to Mo, which verifies the formation of a nitride 46 48 ). Ni-doped Co-Co 2 N is synthesized by first annealing MOFs to form oxide precursors (NiCo 2 O 4 ) followed by ammonization 49 .…”

Section: Resultsmentioning

confidence: 74%

CoO-Mo2N hollow heterostructure for high-efficiency electrocatalytic hydrogen evolution reaction

Zhang

et al. 2019

NPG Asia Mater

View full text Add to dashboard Cite

Driving the electrocatalytic hydrogen evolution reaction (HER) with solar-energy cells is considered a green and sustainable way to produce H 2 . Herein, CoO-Mo 2 N hollow heterojunctions were designed for effective HER based on the combined virtues of the hollow structure and heterojunctions. The hollow CoMoO 4 -Co(OH) 2 precursor was first synthesized via the reaction of Co 2+ from ZIF-67 with MoO 4 2− and OH − in a Na 2 MoO 4 solution. A series of experiments indicate the formation of the hollow Co-Mo-O precursor followed a mechanism analogous to the nanoscale "Kirkendall Effect". After heating in NH 3 , the CoO-Mo 2 N hollow heterostructure was obtained. The Mo species in the precursor played an important role in maintaining the morphology under nitridation treatment. The hollow structure is favorable for contact and diffusion of electrolyte with (in) catalysts, while the CoO in CoO-Mo 2 N is favorable for the dissociation of water. Both promote the HER. Under optimized conditions, the hollow catalyst exhibited good HER performance with an overpotential of 65 mV at 10 mA cm −2 in 1 M KOH. The performance is better than that of many nonprecious metal-based catalysts. An electrolyzer composed of CoO-Mo 2 N heterojunctions as the cathode and NiFe-LDH as the anode can be driven by a solar cell to achieve effective overall water splitting. The adjudication of MOFs makes the route promising for the design of robust catalysts for advanced application.

show abstract

Section: Resultsmentioning

confidence: 74%

CoO-Mo2N hollow heterostructure for high-efficiency electrocatalytic hydrogen evolution reaction

Zhang

et al. 2019

NPG Asia Mater

View full text Add to dashboard Cite

show abstract

“…In addition, the TOF of catalysts was evaluated for a better comparison of the intrinsic catalytic ability by employing methods previously reported . For TOF calculations, the number of surface active sites was estimated by CV test in a pH = 7 phosphate buffer solution (PBS) with a scan rate of 50 mV s −1 .…”

Section: Resultsmentioning

confidence: 99%

Atomically Thin Defect‐Rich Fe–Mn–O Hybrid Nanosheets as High Efficient Electrocatalyst for Water Oxidation

Teng

Wang

Liao

et al. 2018

Adv Funct Materials

178

View full text Add to dashboard Cite

Engineering non-noble metal-based electrocatalysts with superior water oxidation performance is highly desirable for the production of renewable chemical fuels. Here, an atomically thin low-crystallinity Fe-Mn-O hybrid nanosheet grown on carbon cloth (Fe-Mn-O NS/CC) is successfully synthetized as an efficient oxygen evolution reaction (OER) catalyst. The synthesis strategy involves a facile reflux reaction and subsequent low-temperature calcination process, and the morphology and composition of hybrid nanosheets can be tailored conveniently. The defect-rich Fe-Mn-O ultrathin nanosheet with uniform element distribution enables exposure of more catalytic active sites; moreover, the atomic-scale synergistic action of Mn and Fe oxide contributes to an enhanced intrinsic catalytic activity. Therefore, the optimized Fe-Mn-O hybrid nanosheets, with lateral sizes of about 100-600 nm and ≈1.4 nm in thickness, enable a low onset potential of 1.46 V, low overpotential of 273 mV for current density of 10 mA cm −2 , a small Tafel slope of 63.9 mV dec −1 , and superior durability, which are superior to that of individual MnO 2 and FeOOH electrode, and even outperforming most reported MnO 2 -based electrocatalysts.

show abstract

“…At the current density of 10 mA cm À2 ,t he NIN catalyst exhibits an overpotential of 280 mV versus RHE, which is clearly lower than the otherh eteroatom-doped catalysts.T he overpotential of the heteroatom-doped samples increased in the order Ni 1.5 Co 1.5 N (280 mV) < Co 2.25 Ni 0.75 N (290 mV) < Ni 3 N (300 mV) < Co 3 N( 310 mV) < Co 0.75 Ni 2.25 N (330 mV). [53] Furthermore, the polarization curve was performed for 1000 cyclesa nd chronoamperometric response lines were used to investigate the durability of the PF/Ni 1.5 Co 1.5 N electrocatalyst. [51][52] PF/Co 3 N, PF/Ni 0.75 Co 2.25 N,a nd PF/Ni 2.25 Co 0.75 N catalysts, indicating af aster electront ransfer rate during the oxygen evolution reaction ( Figure 4d and Figure S7 bi nt he Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…The content of Nand Pderived from the ionic liquid in the NIN catalyst dramatically increased (Figure 5g), which thusp romoted the OER catalytic performance. [53][54] The capacitance of the PF/Ni 1.5 Co 1.5 N (NIN) is 14.0 mF cm À2 ,a nd the NIN electrode exhibitsal arger electrochemicald ouble-layerc apacitance (C dl )t han the NIA and NN catalysts, suggesting remarkable proliferation of catalytically active sites and thush igh catalytic activity towards the OER ( Figure S9 in the SupportingInformation). It should be emphasized that the excellent catalytic performance of NIN is far superior to that of the reported cobalt-nickel based nitride catalysts in alkaline solution.…”

Section: Resultsmentioning

confidence: 99%

Phosphorus and Fluorine Co‐Doping Induced Enhancement of Oxygen Evolution Reaction in Bimetallic Nitride Nanorods Arrays: Ionic Liquid‐Driven and Mechanism Clarification

Bai

Wang

et al. 2017

Chemistry A European J

View full text Add to dashboard Cite

Electrocatalytic splitting of water is becoming increasingly crucial for renewable energy and device technologies. As one of the most important half-reactions for water splitting reactions, the oxygen evolution reaction (OER) is a kinetically sluggish process that will greatly affect the energy conversion efficiency. Therefore, exploring a highly efficient and durable catalyst to boost the OER is of great urgency. In this work, we develop a facile strategy for the synthesis of well-defined phosphorus and fluorine co-doped Ni Co N hybrid nanorods (HNs) by using ionic liquids (ILs; 1-butyl-3-methylimidazolium hexafluorophosphate). In comparison to the IrO catalyst, the as-obtained PF/Ni Co N HNs manifests a low overpotential of 280 mV at 10 mA cm , Tafel slope of 66.1 mV dec , and excellent durability in 1.0 m KOH solution. Furthermore, the iR-corrected electrochemical results indicate it could achieve a current density of 100 mA cm at an overpotential of 350 mV. The combination of cobalt and nickel elements, 1D mesoporous nanostructure, heteroatom incorporation, and ionic liquid-assisted nitridation, which result in faster charge transfer capability and more active surface sites, can facilitate the release of oxygen bubbles from the catalyst surface. Our findings confirm that surface heteroatom doping in bimetallic nitrides could serve as a new class of OER catalyst with excellent catalytic activity.

show abstract

Bimetallic Ni–Mo nitride nanotubes as highly active and stable bifunctional electrocatalysts for full water splitting

Abstract: Bimetallic Ni–Mo nitride nanotubes as highly active and stable bifunctional catalysts for full water splitting are favorably comparable to the performance of Pt/C and IrO2.

Cited by 198 publications

References 74 publications

CoO-Mo2N hollow heterostructure for high-efficiency electrocatalytic hydrogen evolution reaction

CoO-Mo2N hollow heterostructure for high-efficiency electrocatalytic hydrogen evolution reaction

Atomically Thin Defect‐Rich Fe–Mn–O Hybrid Nanosheets as High Efficient Electrocatalyst for Water Oxidation

Phosphorus and Fluorine Co‐Doping Induced Enhancement of Oxygen Evolution Reaction in Bimetallic Nitride Nanorods Arrays: Ionic Liquid‐Driven and Mechanism Clarification

Contact Info

Product

Resources

About