Electrocatalysts for hydrogen oxidation and evolution reactions

Lu, Siqi; Zhuang, Zhongbin

doi:10.1007/s40843-016-0127-9

Cited by 148 publications

(97 citation statements)

References 117 publications

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“…The high-resolution TEM (HRTEM) image (Fig. 1f) shows the fringe spacing of 0.52 nm, which is corresponded to the previous reports about Co 2 3 atmosphere to produce Co-V bimetal-based electrocatalysts. Fig.…”

Section: Resultssupporting

confidence: 86%

“…Hydrogen, with zero CO 2 emission in use, has attracted intensive attention as clean energy resources [1]. Today, most H 2 is produced from fossil resources through a steam reforming process, which consumes the fossil fuels accompanied by the emission of CO 2 [2,3]. The electrocatalytic water splitting has been considered as a promising approach for sustainable hydrogen production from clean and abundant water with zero carbon emission [4].…”

Section: Introductionmentioning

confidence: 99%

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Cobalt-vanadium bimetal-based nanoplates for efficient overall water splitting

Xiao

Tian

et al. 2017

Sci. China Mater.

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The development of effective and low-cost catalysts for overall water splitting is essential for clean production of hydrogen from water. In this paper, we report the synthesis of cobalt-vanadium (Co-V) bimetal-based catalysts for the effective water splitting. The Co 2 V 2 O 7 ·xH 2 O nanoplates containing both Co and V elements were selected as the precursors. After the calcination under NH 3 atmosphere, the Co 2 VO 4 and Co/VN could be obtained just by tuning the calcination temperature. Electrochemical tests indicated that the Co-V bimetal-based materials could be used as active hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) catalyst by regulating their structure. The Co/VN showed good performance for HER with the onset potential of 68 mV and can achieve a current density of 10 mA cm −2 at an overpotential of 92 mV. Meanwhile, the Co 2 VO 4 exhibited the obvious OER performance with overpotential of 300 mV to achieve a current density of 10 mA cm −2 . When the Co 2 VO 4 and Co/VN were used as the anode and cathode in a twoelectrode system, respectively, the cell needed a voltage of 1.65 V to achieve 10 mA cm −2 together with good stability. This work would be indicative to constructing Co-V bimetalbased catalysts for the catalytic application.

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Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Cobalt-vanadium bimetal-based nanoplates for efficient overall water splitting

Xiao

Tian

et al. 2017

Sci. China Mater.

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“…However, the multistep electron transfer of ORR leads to sluggish kinetics and a large overpotential, which is related to O 2 adsorption on the electrode surface and the O-O bond cleavage [5][6][7]. Ptbased materials are effective eletrocatalysts, which can promote the reaction and reduce the overpotential through a one-step four electron transfer process [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Encapsulated MnO in N-doping carbon nanofibers as efficient ORR electrocatalysts

et al. 2017

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Development of cheap, abundant and noblemetal-free materials as high efficient oxygen reduction electrocatalysts is crucial for future energy storage system. Here, one-dimensional (1D) MnO N-doped carbon nanofibers (MnO-NCNFs) were successfully developed by electrospinning combined with high temperature pyrolysis. The MnO-NCNFs exhibit promising electrochemical performance, methanol tolerance, and durability in alkaline medium. The outstanding electrocatalytic activity is mainly attributed to several issues. First of all, the uniform 1D fiber structure and the conductive network could facilitate the electron transport. Besides, the introduction of Mn into the precursor can catalyze the transformation of amorphous carbon to graphite carbon, while the improved graphitization means better conductivity, beneficial for the enhancement of catalytic activity for oxygen reduction reaction (ORR). Furthermore, the porous structure and high surface area can effectively decrease the mass transport resistance and increase the exposed ORR active sites, thus improve utilization efficiency and raise the quantity of exposed ORR active sites. The synergistic effect of MnO and NCNFs matrix, which enhances charge transfer, adsorbent transport, and delivers efficiency in the electrolyte solution, ensures the high ORR performance of MnO-NCNFs.

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“…And the great demand of H 2 production triggers a body of research inputs on the water splitting, in which the key fact depends on the innovative exploitation regarding the design of efficient electrocatalysts helping lower the overpotential meanwhile obtaining decent reaction rates [5,6]. However, the most efficient noble-metal based electrocatalysts suffer from natural resource scarcity and high-cost, which hampers their broad utilization [7][8][9][10]. Although a variety of non-noble metal-based nanostructured materials such as Mo 2 C/MoO 2 [11], Co 9 S 8 /graphene [12], CoPS [13], CoMoS [14], NiMoN [15] have been reported, the facts are still far from satisfactory since these materials are either for oxygen evolution reaction (OER) catalysts working in strongly alkaline conditions or for hydrogen evolution reaction (HER) catalysts operating in strongly acidic mediums due to the thermodynamic convenience [5,[16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Acid promoted Ni/NiO monolithic electrode for overall water splitting in alkaline medium

Hou

et al. 2017

Sci. China Mater.

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Exploring and designing bi-functional catalysts with earth-abundant elements that can work well for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline medium are of significance for producing clean fuel to relieve energy and environment crisis. Here, a novel Ni/NiO monolithic electrode was developed by a facile and cost-effective acid promoted activation of Ni foam. After the treatment, this obtained monolithic electrode with a layer of NiO on its surface demonstrates rough and sheet-like morphology, which not only possesses larger accessible surface area but also provides more reactive active sites. Compared with powder catalysts, this monolithic electrode can achieve intimate contact between the electrocatalyst and the current collector, which will alleviate the problem of pulverization and enable the stable function of the electrode. It can be served as an efficient bi-functional electrocatalyst with an overpotential of 160 mV for HER and 290 mV for OER to produce current densities of 10 mA cm −2 in the alkaline medium. And it maintains benign stability after 5,000 cycles, which rivals many recent reported noble-metal free catalysts in 1.0 mol L −1 KOH solution. Attributed to the easy, scalable methodology and high catalytic efficiency, this work not only offers a promising monolithic catalyst but also inspires us to exploit other inexpensive, highly efficient and self-standing noble metalfree electrocatalysts for scale-up electrochemical water-splitting technology.

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Electrocatalysts for hydrogen oxidation and evolution reactions

Cited by 148 publications

References 117 publications

Cobalt-vanadium bimetal-based nanoplates for efficient overall water splitting

Cobalt-vanadium bimetal-based nanoplates for efficient overall water splitting

Encapsulated MnO in N-doping carbon nanofibers as efficient ORR electrocatalysts

Acid promoted Ni/NiO monolithic electrode for overall water splitting in alkaline medium

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