Cobalt phosphate nanoparticles decorated with nitrogen-doped carbon layers as highly active and stable electrocatalysts for the oxygen evolution reaction

Yuan, Cheng‐Zong; Jiang, Yifan; Zhou, Wang; Xie, Xiaoguang; Yang, Zhengkun; Yousaf, Ammar Bin; Xu, An‐Wu

doi:10.1039/c6ta01929c

Cited by 239 publications

(159 citation statements)

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“…The η 10 for CoPPi nanobelts, nanoleaves, and nanorhombuses are determined to be 371, 390, and 424 mV, respectively, higher than that of nanowires. In terms of η 10 , the catalytic performance of our CoPPi nanowires outperforms the reported coralloid Co 2 P 2 O 7 nanocrystal carbon composite catalyst CL‐Co 2 P 2 O 7 @C (397 mV) and most of CoPi catalysts studied in alkaline media, such as mesoporous CoPi (380 mV), Co 3 (PO 4 ) 2 (≈430 mV), and even comparable to that of CoPi@C composite, for example, CC/NPC/CP (430 mV), Co 3 (PO 4 ) 2 @N‐C (317 mV), and CoPi/PCDs (350 mV) …”

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confidence: 68%

“…Interestingly, CoPPi nanowires electrode exhibits a Tafel slope of 54.1 mV dec −1 , substantially lower than that of Ir/C, and also the CoPPi nanobelts (57.9 mV dec −1 ), nanoleaves (81.6 mV dec −1 ), and nanorhombuses (118.5 mV dec −1 ), suggesting the favorable OER kinetics of CoPPi nanowires . Note that this value is lower than the reported CL‐Co 2 P 2 O 7 @C (70 mV dec −1 ) and the other CoPi based catalysts, for example, mesoporous CoPi (58.7 mV dec −1 ), Co 3 (PO 4 ) 2 @N‐C (62 mV dec −1 ), and CC/NPC/CP (80 mV dec −1 ) . In order to estimate the intrinsic activity, turnover frequency (TOF) was calculated by assuming that all catalysts were involved in OER processes (see the Supporting Information) .…”

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confidence: 74%

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Engineering Morphologies of Cobalt Pyrophosphates Nanostructures toward Greatly Enhanced Electrocatalytic Performance of Oxygen Evolution Reaction

Zhao

et al. 2018

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Herein, a surfactant- and additive-free strategy is developed for morphology-controllable synthesis of cobalt pyrophosphate (CoPPi) nanostructures by tuning the concentration and ratio of the precursor solutions of Na P O and Co(CH COO) . A series of CoPPi nanostructures including nanowires, nanobelts, nanoleaves, and nanorhombuses are prepared and exhibit very promising electrocatalytic properties toward the oxygen evolution reaction (OER). Acting as both reactant and pseudo-surfactant, the existence of excess Na P O is essential to synthesize CoPPi nanostructures for unique morphologies. Among all CoPPi nanostructures, the CoPPi nanowires catalyst renders the best catalytic performance for OER in alkaline media, achieving a low Tafel slope of 54.1 mV dec , a small overpotential of 359 mV at 10 mA cm , and superior stability. The electrocatalytic activities of CoPPi nanowires outperform the most reported non-noble metal based catalysts, even better than the benchmark Ir/C (20%) catalyst. The reported synthesis of CoPPi gives guidance for morphology control of transition metal pyrophosphate based nanostructures for a high-performance inexpensive material to replace the noble metal-based OER catalysts.

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confidence: 68%

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confidence: 74%

Engineering Morphologies of Cobalt Pyrophosphates Nanostructures toward Greatly Enhanced Electrocatalytic Performance of Oxygen Evolution Reaction

Zhao

et al. 2018

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“…Achieving low overpotential for the conventionally sluggish OER near neutral pH, demands a combination of highly dense and uniformly accessible active sites. Further, the surface‐reconstruction induced formation of amorphous layer would enhance the four‐electron OER . Such reconstruction of the surface has been observed to transform the crystalline phases to catalytically active amorphous domains resulting in high OER activity .…”

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Compositional Control as the Key for Achieving Highly Efficient OER Electrocatalysis with Cobalt Phosphates Decorated Nanocarbon Florets

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et al. 2019

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Compositional interplay of two different cobalt phosphates (Co(H2PO4)2; Co‐DP and Co(PO3)2; Co‐MP) loaded on morphologically engineered high surface area nanocarbon leads to an increased electrocatalytic efficiency for oxygen evolution reaction (OER) in near neutral conditions. This is reflected as significant reduction in the onset overpotential (301 mV) and enhanced current density (30 mA cm−2 @ 577 mV). In order to achieve uniform surface loading, organic‐soluble thermolabile cobalt‐bis(di‐tert‐butylphosphate) is synthesized in situ inside the nanocarbon matrix and subsequently pyrolyzed at 150 °C to produce Co(H2PO4)2/Co(PO3)2 (80:20 wt%). Annealing this sample at 200 or 250 °C results in the redistribution of the two phosphate systems to 55:45 or 20:80 (wt%), respectively. Detailed electrochemical measurements clearly establish that the 55:45 (wt%) sample prepared at 200 °C performs the best as a catalyst, owing to a relay mechanism that enhances the kinetics of the 4e− transfer OER process, which is substantiated by micro‐Raman spectroscopic studies. It is also unraveled that the engineered nanocarbon support simultaneously enhances the interfacial charge‐transfer pathway, resulting in the reduction of onset overpotential, compared to earlier investigated cobalt phosphate systems.

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“…reported that cobalt phosphate nanoparticles decorated with nitrogen‐doped carbon layers (Co 3 (PO 4 ) 2 @N−C), which were synthesized via hydrothermal method that O‐phospho‐DL‐serine was added to water/ethanol solution (1 : 1) consisting Cobalt(II) acetate. The homogeneous mixture solution was transferred to Teflon‐lined stainless steel autoclave and maintained at 200 °C for 24 h …”

Section: Syntheses Of Phosphate‐based Electrocatalystsmentioning

confidence: 99%

Phosphate‐Based Electrocatalysts for Water Splitting: Recent Progress

et al. 2018

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Efficient hydrogen production by water electrolysis is significant for the development of renewable energy. To date, the cost and scarcity of noble‐metal catalysts are limiting their scale‐up applications. To overcome the current challenge, high‐performance novel electrocatalysts are required to speed up the commercialization of electrolysis technology. Notably, the sluggish electrode reactions, namely, the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), especially the latter, have been the main rate‐limiting factor for water splitting. Phosphate, as a new series of OER electrocatalysts, has attracted enormous attentions, owing to its unique lattice structure geometry. The phosphate group not only benefits the adsorption of water molecule but also facilitates the oxyhydrate of metal site and dissociation of water. This Minireview provides a brief summary of the recent progresses of phosphate‐based electrocatalysts, discusses the relationship between crystal structure and catalytic activity, and presents the challenges of phosphate electrocatalysts.

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Cobalt phosphate nanoparticles decorated with nitrogen-doped carbon layers as highly active and stable electrocatalysts for the oxygen evolution reaction

Abstract: We develop a facile method to prepare cobalt phosphate nanoparticles coated by N-doped carbon layers for highly active and stable OER electrocatalyst.

Cited by 239 publications

References 43 publications

Engineering Morphologies of Cobalt Pyrophosphates Nanostructures toward Greatly Enhanced Electrocatalytic Performance of Oxygen Evolution Reaction

Engineering Morphologies of Cobalt Pyrophosphates Nanostructures toward Greatly Enhanced Electrocatalytic Performance of Oxygen Evolution Reaction

Compositional Control as the Key for Achieving Highly Efficient OER Electrocatalysis with Cobalt Phosphates Decorated Nanocarbon Florets

Phosphate‐Based Electrocatalysts for Water Splitting: Recent Progress

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