期刊
NANO ENERGY
卷 58, 期 -, 页码 183-191出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2019.01.030
关键词
Water splitting; Pyroelectric; External power source; H-2 generation
类别
资金
- European Research Council, United Kingdom under the European Union's Seventh Framework Programme (FP/2007-2013)/ERC Grant [320963]
- Leverhulme Trust, United Kingdom [RPG-2018-290]
- State Key Laboratory of Powder Metallurgy, Central South University, China Changsha, China [621011812]
- EPSRC [EP/R035407/1] Funding Source: UKRI
Water splitting by thermal cycling of a pyroelectric element that acts as an external charge source offers an alternative method to produce hydrogen from transient low-grade waste heat or natural temperature changes. In contrast to conventional energy harvesting, where the optimised load resistance is used to maximise the combination of current and voltage, for water splitting applications there is a need to optimise the system to achieve a sufficiently high potential difference for water electrolysis, whilst also maintaining a high current output. For the thermal harvesting system examined here, a high impedance 0.5 M KOH electrolyte with working electrodes connected to a rectified pyroelectric harvester produced the highest voltage of 2.34 V, which was sufficient for H-2 generation. In addition to electrolyte concentration, the frequency of the temperature oscillations was examined and reducing the heating-cooling frequency led to a larger change in temperature to generate increased pyroelectric charge and a higher potential difference for pyro-water splitting. Finally, in the absence of sacrificial reagents, cyclic production of H-2 (0.654 mu mol/h) was demonstrated for the optimised processing parameters of electrolyte and thermal cycling frequency using the external pyroelectric element as a charge source for water splitting.
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