Bazri BLin Y.-CLu T.-HCHIH-JUNG CHENKowsari EHu S.-FRU-SHI LIU2021-08-032021-08-03201720444753https://www.scopus.com/inward/record.uri?eid=2-s2.0-85019630923&doi=10.1039%2fc6cy02688e&partnerID=40&md5=e38ba8cbd1772713788c99220ca39829https://scholars.lib.ntu.edu.tw/handle/123456789/575868Cobalt ditelluride as a cocatalyst on the surface of a silicon microwire array (Si-MWs) and as a heterocathode structure for the hydrogen evolution reaction was synthesized via a one-step drop-casting method. The improvement in the photo-electrocatalytic efficiency, including the 0.66 V anodic shift in the onset potential and the -24.0 mA cm-2 photocurrent density, is comparable to that of other cocatalyst systems for water reduction. The photocurrent decay of CoTe2@Si-MWs further improved to roughly -10 mA cm-2 by deposition of 10 nm atomic-layer-deposited TiO2 on the Si-MW photocathode for 67 min. Outcomes of this study may demonstrate the possibility of introducing a new class of telluride cocatalyst heterocathode system as an alternative to noble metals in facilitating the water splitting reaction. The cobalt ditelluride across the TiO2-passivated Si-MWs heterocathode is reported to have an effective response to solar water reduction for the first time. ? The Royal Society of Chemistry 2017.Atomic layer deposition; Cobalt; Passivation; Silicon; Atomic layer deposited; Electrocatalytic efficiencies; Hydrogen evolution reactions; Photocurrent decay; Photocurrent density; Silicon microwire; Solar water splitting; Water splitting reactions; Titanium dioxide[SDGs]SDG7Atomic layer deposition; Cobalt; Passivation; Silicon; Atomic layer deposited; Electrocatalytic efficiencies; Hydrogen evolution reactions; Photocurrent decay; Photocurrent density; Silicon microwire; Solar water splitting; Water splitting reactions; Titanium dioxidejournal article10.1039/c6cy02688e2-s2.0-85019630923