An electrochemically neutralized energy-assisted low-cost acid-alkaline electrolyzer for energy-saving electrolysis hydrogen generation

Li, Yan; Chen, Junxiang; Cai, Pingwei; Wen, Zhenhai

doi:10.1039/c7ta10374c

Cited by 213 publications

(83 citation statements)

References 46 publications

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“…The robust ECO and ECH stability of VN and Pd/VN make them ideal electrocatalysts for biomass conversion. Owing to the more favorable thermodynamics of the ECO than the OER, boosting H 2 production by replacing the OER with the ECO of HMF over the VN/NiF electrode can also be realized (Figures S33 and S34, Supporting Information) …”

Section: Resultsmentioning

confidence: 98%

“…The bipolar membrane can tolerate different pH values in two separate compartments. Such a design not only shortens the electron transport pathway and maximizes the electrocatalytic activity of the electrocatalysts in incompatible electrolytes, but also significantly reduces the electrical energy consumed to facilitate paired electrosynthesis . The paired electrosynthesis performance was evaluated at a constant current of 100 mA and within a voltage range of 2.5–3.0 V (Figure S42b, Supporting Information) with a flow rate of 130 mL min −1 and 70 recycles h −1 .…”

Section: Resultsmentioning

confidence: 99%

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Biomass Valorization via Paired Electrosynthesis Over Vanadium Nitride‐Based Electrocatalysts

Sun

Yao

et al. 2019

Adv Funct Materials

130

124

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Paired electrosynthesis is a promising technology with the potential to generate value-added products at both electrodes in a cost-effective manner. Herein, 3D vanadium nitride (VN) and Pd/VN hollow nanospheres are successfully fabricated and coupled to carry out simultaneous electrocatalytic oxidation (ECO) and electrocatalytic hydrogenation (ECH) of 5-hydroxymethylfurfural (HMF) into 2, 5-furandicarboxylic acid (FDCA) and 2,5-bishydroxymethyl-tetrahydrofuran (DHMTHF), respectively. VN shows excellent ECO performance with high HMF conversion (≥98%), FDCA selectivity (≥96%), and faradaic efficiency (≥84%) after a stability test, and Pd/VN achieves high ECH selectivity for DHMTHF at ≥88% and an HMF conversion of ≥90%, with a faradaic efficiency of ≥86%. VN and Pd/VN incorporated into a membrane electrode assembly in a paired electrolysis system shows potential for large-scale biomass conversion and upgrading. Theoretical calculations reveal that the higher performance of VN for the production of ECO can be attributed to its lower d-band center level relative to the Fermi level compared to that of V 2 O 5 , which favors HMF chemisorption and activation. This study paves the way for developing paired electrosynthesis technologies with the potential for biomass utilization and energy conversion.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Biomass Valorization via Paired Electrosynthesis Over Vanadium Nitride‐Based Electrocatalysts

Sun

Yao

et al. 2019

Adv Funct Materials

130

124

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“…At a current of 10 A g -1 , above 92% of its initial capacity can remain with an average Columbia e ciency of 96% after 200 cycles, which is superior to those of MoO 3 NB (Fig. S12, In this as-developed hybrid device, the redox reactions of anode and cathode can proceed in their optimal conditions with potential of harvesting the so-called electrochemical neutralization energy (ENE), 44,45,46,47,48 which can signi cantly enhance the voltage and energy density of energy devices. Fig.…”

Section: Resultsmentioning

confidence: 98%

Coupling Alkaline Conversion Zn Anode with Acidic Proton-insertion MoO3 Cathode for High-voltage Aqueous Rechargeable Hybrid Battery

Cai¹,

Ding²,

Liu³

et al. 2020

Preprint

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Hydrogen ions (H+) and hydroxide ions (OH-) are regarded as ideal charge carriers for rechargeable batteries thanks to their small size, high ion mobility, low cost, and wide flexibility compared to the metal ions. However, the implementation of storage of both H+ and OH- in one electrochemical energy device face grand challenge due to incompatibility between H+ and OH-. Herein, we report an alkali-acid Zn-MoO3 hybrid battery that employ H+ and OH- as charge carriers of cathode and anode, respectively, in which the insertion/deinsertion of H+ take place on layer structured MoO3 cathode in acid while OH- are involved in alkaline conversion Zn anode, which offers a promising route to well address the incompatible issues of H+ and OH- in one electrolyte. The as-built hybrid battery can deliver a high open-circuit voltage of 1.85 V, a high rate capability, a high capacity of 158 mAh g-1 at a current density of 5 A g-1, and excellent capacity retention of above 90% over 200 cycles. This work sheds light on the development of aqueous energy devices with high voltage and energy density through materials engineering and device optimization.

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“…Different from water transport part of other evaporators, the evaporator added a water regulation link. [ 61–64 ] The water on the evaporative surface could be decreased by reducing water transport speed. The RE for evaporation would more closely match the IE.…”

Section: Introductionmentioning

confidence: 99%

Energy Matching for Boosting Water Evaporation in Direct Solar Steam Generation

Wang

et al. 2020

Solar RRL

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Energy matching strategy is verified as an effective method for significant improvement of evaporation rate in direct solar steam generation (DSSG). By adjusting the solid-liquid interface through bilayer structure, the water transport speed from reservoir to evaporation surface is controlled to reduce the required energy (RE) for closely matching with that of input energy (IE). The highest evaporation rate can reach up to 2.22 kg m À2 h À1 under one-sun illumination, which is improved by 40% through energy matching. A solar-to-vapor energy conversion efficiency of 93.2% is obtained. It is also highly effective in practical applications including desalination, sewage treatment, oil-water separation, and heavy metal ions treatment. This concept displays a balance between the energy needed for water waiting to be evaporated and the IE. It can inspire more ideas for researchers to accelerate the development of DSSG.

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An electrochemically neutralized energy-assisted low-cost acid-alkaline electrolyzer for energy-saving electrolysis hydrogen generation

Abstract: The ability to reduce the energy consumed and the cost in water splitting is crucial for the generation of hydrogen, which can be stored and then oxidized to deliver clean, abundant, and sustainable energy with the regeneration of water.

Cited by 213 publications

References 46 publications

Biomass Valorization via Paired Electrosynthesis Over Vanadium Nitride‐Based Electrocatalysts

Biomass Valorization via Paired Electrosynthesis Over Vanadium Nitride‐Based Electrocatalysts

Coupling Alkaline Conversion Zn Anode with Acidic Proton-insertion MoO3 Cathode for High-voltage Aqueous Rechargeable Hybrid Battery

Energy Matching for Boosting Water Evaporation in Direct Solar Steam Generation

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