Improved 3D porous structures of Ni electrodes prepared by high-pressure cold spray and post annealing for water splitting

Jiang, Xinge; Song, Jingjing; Wang, Xin; Song, Caixia; Xie, Yang; Liu, Taikai; Deng, Chunming; Liu, M.; Zhang, N.N.; Liao, H.

doi:10.1016/j.ijhydene.2022.02.088

Cited by 8 publications

(5 citation statements)

References 44 publications

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“…37 The transition metal Ni is frequently used as a catalyst to build photo-catalytic and electro-catalytic H 2 evolution systems. 38–40 In acidic solutions, the rate of the HER catalyzed by Ni is determined by the rate of H ads desorption due to its low Δ G H . 41,42 Non-acidic solutions have low H + concentrations, and the H 2 O-dissociation-limited Volmer reaction slows down the HER on Ni.…”

Section: Resultsmentioning

confidence: 99%

Promoting water splitting by transforming its presence status for enhanced hydrogen evolution

Han,

Hou,

Shuai

et al. 2024

New J. Chem.

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Section: Resultsmentioning

confidence: 99%

Promoting water splitting by transforming its presence status for enhanced hydrogen evolution

Han,

Hou,

Shuai

et al. 2024

New J. Chem.

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“…In this way, the uncertainty in coating catalysts on the substrates of porous electrodes can be avoided. On the other hand, Raney nickel has been employed instead of nickel as electrodes in practical applications. − Raney nickel is produced by leaching Al from the Ni–Al alloy and hence has a porous structure. Thus, Raney nickel porous electrodes are also studied.…”

Section: Resultsmentioning

confidence: 99%

Bubbles in Porous Electrodes for Alkaline Water Electrolysis

Wu,

Hu,

Zhang

et al. 2023

Langmuir

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Porous electrodes with high specific surface areas have been commonly employed for alkaline water electrolysis. The gas bubbles generated in electrodes due to water electrolysis, however, can screen the reaction sites and hinder reactant transport, thereby deteriorating the performance of electrodes. Hence, an indepth understanding of the behavior of bubbles in porous electrodes is of great importance. Nevertheless, since porous electrodes are opaque, direct observation of bubbles therein is still a challenge. In this work, we have successfully captured the behavior of bubbles in the pores at the side surfaces of nickel-based porous electrodes. Two types of porous electrodes are employed: the ones with straight pores along the gravitational direction and the ones with tortuous pores. In the porous electrodes with tortuous pores, the moving bubbles are prone to collide with the solid matrix, thereby leading to the accumulation of bubbles in the pores and hence bubble trapping. By contrast, in the porous electrodes with straight pores, bubbles are seldom trapped; and when two bubbles near the wall surfaces coalesce, the merged bubble can jump away from the wall surfaces, releasing more active surfaces for reaction. As a result, the porous electrodes with straight pores, although with lower specific surface areas, are superior to those with tortuous pores. The relationship among the pore structures of porous electrodes, bubble behavior, and electrode performance disclosed in this work provides deep insights into the design of porous electrodes.

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“…Indeed, the absence of a spurious diffraction peak confirms the formation of a pure NiAl phase, and no impurities were detected. Jiang et al [21] have developed, through the high-pressure cold spray method, a Ni based electrode with controlled 3D porous structures.…”

Section: Microstructural Characterizationsmentioning

confidence: 99%

Enhanced Electrochemical Activity of NiAl Cathode for Hydrogen Production

Latreche,

Boutarek-Zaourar,

Bencherifa

et al. 2024

Preprint

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This work is devoted to the elaboration of Ni68%Al32% wt. (NiAl) intermetallic compound highly electro-active and cost-effective electrode materials using an induction furnace utilized as cathodes in alkaline water reduction into hydrogen. The XRD analysis showed the formation of the NiAl phase with an average crystallite size of 44.13 nm. The SEM/EDS results confirm the XRD results with an average grain size of 50 µm. The chemical activation of Aluminum from NiAl was carried out on NaOH (25%) solution at 353 K for 72 h. The Optical Profilometry and UV-visible spectrophotometry confirmed the formation of Ni-Raney-type electrodes with high specific surface area. The activated NiAl electrodes resulted in remarkable efficiency for the hydrogen evolution reaction (HER), 13 times higher than the non-activated electrode. The comparison with literature data reveals that the efficiency of the NiAl cathode has increased by 120% compared to pure Ni.

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Improved 3D porous structures of Ni electrodes prepared by high-pressure cold spray and post annealing for water splitting

Cited by 8 publications

References 44 publications

Promoting water splitting by transforming its presence status for enhanced hydrogen evolution

Promoting water splitting by transforming its presence status for enhanced hydrogen evolution

Bubbles in Porous Electrodes for Alkaline Water Electrolysis

Enhanced Electrochemical Activity of NiAl Cathode for Hydrogen Production

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