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Issue 27, 2017
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Combining catalysis and hydrogen storage in direct borohydride fuel cells: towards more efficient energy utilization

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Abstract

The hydrogen evolution reaction (HER) during the electrochemical oxidation of borohydride is the major efficiency loss in direct borohydride fuel cells (DBFCs). Here we show that an YH2–Pd thin film electrode, which combines catalysis on the Pd layer and H storage in the YH2 layer, can effectively promote the energy utilization efficiency. The YH2 layer can absorb the atomic H generated during the BH4 oxidation on the Pd layer and effectively suppress HER. The absorbed H can be further oxidized into H2O in NaOH solution, allowing full utilization of the 8 electrons in BH4 oxidation. The YH2–Pd electrode can be regarded as a hybridization of the anodes in conventional DBFCs and nickel-metal hydride batteries. The hydrogen absorption/desorption during the electrochemical process is in situ monitored by optical transmittance measurements, which provide key insights into the interconversion mechanisms and energetics of the hydridic, neutral and protonic hydrogen species.

Graphical abstract: Combining catalysis and hydrogen storage in direct borohydride fuel cells: towards more efficient energy utilization

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Publication details

The article was received on 03 Mar 2017, accepted on 13 Jun 2017 and first published on 13 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA01954H
Citation: J. Mater. Chem. A, 2017,5, 14310-14318
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    Combining catalysis and hydrogen storage in direct borohydride fuel cells: towards more efficient energy utilization

    J. Chen, J. Fu, K. Fu, R. Xiao, Y. Wu, X. Zheng, Z. Liu, J. Zheng and X. Li, J. Mater. Chem. A, 2017, 5, 14310
    DOI: 10.1039/C7TA01954H

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