Wide range ph-tolerable silicon@Pyrite cobalt dichalcogenide microwire array photoelectrodes for solar hydrogen evolution
學年 104
學期 2
出版（發表）日期 2016-02-09
作品名稱 Wide range ph-tolerable silicon@Pyrite cobalt dichalcogenide microwire array photoelectrodes for solar hydrogen evolution
作品名稱（其他語言）
著者 Chih-Jung Chen; Kai-Chih Yang; Mrinmoyee Basu; Tzu-Hsiang Lu; Ying-Rui Lu; Chung-Li Dong; Shu-Fen Hu; Ru-Shi Liu
單位
出版者
著錄名稱、卷期、頁數 ACS Applied Materials & Interfaces 8(8), pp.5400–5407
摘要 This study employed silicon@cobalt dichalcogenide microwires (MWs) as wide range pH-tolerable photocathode material for solar water splitting. Silicon microwire arrays were fabricated through lithography and dry etching technologies. Si@Co(OH)2 MWs were utilized as precursors to synthesize Si@CoX2 (X = S or Se) photocathodes. Si@CoS2 and Si@CoSe2 MWs were subsequently prepared by thermal sulfidation and hydrothermal selenization reaction of Si@Co(OH)2, respectively. The CoX2 outer shell served as cocatalyst to accelerate the kinetics of photogenerated electrons from the underlying Si MWs and reduce the recombination. Moreover, the CoX2 layer completely deposited on the Si surface functioned as a passivation layer by decreasing the oxide formation on Si MWs during solar hydrogen evolution. Si@CoS2 photocathode showed a photocurrent density of −3.22 mA cm–2 at 0 V (vs RHE) in 0.5 M sulfuric acid electrolyte, and Si@CoSe2 MWs revealed moderate photocurrent density of −2.55 mA cm–2. However, Si@CoSe2 presented high charge transfer efficiency in neutral and alkaline electrolytes. Continuous chronoamperometry in acid, neutral, and alkaline solutions was conducted at 0 V (vs RHE) to evaluate the photoelectrochemical durability of Si@CoX2 MWs. Si@CoS2 electrode showed no photoresponse after the chronoamperometry test because it was etched through the electrolyte. By contrast, the photocurrent density of Si@CoSe2 MWs gradually increased to −5 mA cm–2 after chronoamperometry characterization owing to the amorphous structure generation.
關鍵字 cobalt dichalcogenide;silicon microwire arrays;wide range pH toleration;hydrogen evolution;solar water splitting;co-catalyst
語言 en_US
ISSN 1944-8244 1944-8252
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 是
國別 USA
公開徵稿
出版型式 ,電子版,紙本
相關連結

機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/107095 )