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. 2016 Sep 15;6:33400. doi: 10.1038/srep33400

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Copyright © 2016, The Author(s)

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(a) Phase change in XRD patterns of WO₃ electrode and (b) Color change in WO₃ electrode before and after photocharging (0–12 h). (c) Possible pathways for back electron transfer during photocharging. (d) CV curves of WO₃ electrode at a scan rate of 10 mV s⁻¹. (e) Monitoring of electrical potential of WO₃ electrode during photocharging, storage, and discharge.