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首页> 外文会议>Pacific Rim Meeting on Electrochemical and Solid-State Science >Selective Loading of Platinum or Silver Cocatalyst on a Hydrogen-Evolution Photocatalyst in an Overall Water-Splitting System, Silver-Inserted Zinc Rhodium Oxide and Bismuth Vanadium Oxide
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Selective Loading of Platinum or Silver Cocatalyst on a Hydrogen-Evolution Photocatalyst in an Overall Water-Splitting System, Silver-Inserted Zinc Rhodium Oxide and Bismuth Vanadium Oxide

机译：在整个水分裂系统中的氢气进化光催化剂上选择性装载铂或银椰油催化剂，银插入氧化锌氧化锌和氧化铋

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Since Fujishima and Honda reported photoelectrochemical water splitting using a TiO_2 electrode in 1972, solar hydrogen (H_2) production from water using a photocatalyst has attracted attention as a clean energy resource. Most recent researches have been focusing on the visible-light sensitization of catalysts to effectively utilize solar energy. Recently, we have developed a novel solid-state photocatalyst by inserting silver (Ag) or gold (Au) as an electron mediator between zinc rhodium oxide (ZnRh_2O_4, Eg of 1.2 eV) and bismuth vanadate (Bi_4V_2O_(11), Eg of 1.7 eV) as H_2- and oxygen (O_2)-photocatalysts, respectively (ZnRh_2O_4/Ag/Bi_4V_2O_(11), ZnRh_2O_4/Au/Bi_4V_2O_(11). In this system, we achieved overall pure-water splitting, liberating H_2 and O_2 simultaneously from pure water at a stoichiometric ratio 2 to 1, photocatalyzed via the inserted Ag or Au which could transfer photo-excited electrons from the conduction band (CB) of Bi_4V_O_(11) to the valence band (VB) of ZnRh_2O_4. The ZnRh_2O_4/Ag (Au)/Bi_4V_2O_(11) utilized visible light up to 740 nm. Notably, the ZnRh_2O_4/Ag/Bi_4V_2O_(11) system did not include a cocatalyst, which is inevitably required for the water-splitting reaction due to increasing the lifetime of electron-and-hole pairs and storing either electrons or holes. Thus, in the present study, we tried to load a cocatalyst, Ag or Pt, selectively onto the H2-evolution photocatalyst, ZnRh_2O_4, in ZnRh_2O_4/Ag/Bi_4V_2O_(11) to enhance the photosensitivity of this system.
机译：自福金马和本田报告了1972年使用TiO_2电极的光电化学水分裂，Solar氢气（H_2）使用光催化剂的水产生的生产引起了清洁能源的关注。最近的研究一直专注于催化剂的可见光敏，以有效地利用太阳能。最近，我们通过将银（Ag）或金（Au）插入氧化锌（ZnRH_2O_4，例如1.2eV）和钒酸盐（Bi_4V_2O_（11）之间的电子介体（Bi_4V_2O_（11）），开发了一种新型固态光催化剂（Bi_4V_2O_（11），例如1.7 EV）分别为H_2-和氧气（O_2）-photocatalysts（ZnRH_2O_4 / AG / Bi_4V_2O_（11），ZnRH_2O_4 / AU / Bi_4V_2O_（11）。在该系统中，我们同时实现了总体纯净水分裂，解放了H_2和O_2从化学计量比2至1的纯水，通过插入的AG或Au光催化，其可以将来自Bi_4V_O_（11）的导通带（CB）转移到ZnRH_2O_4的价带（VB）的光激发电子。ZnRH_2O_4 / AG（AU）/ Bi_4V_2O_（11）利用高达740nm的可见光。值得注意的是，ZnRH_2O_4 / AG / Bi_4V_2O_（11）系统不包括助催化剂，这是不可避免的，因为增加了寿命，不可避免地需要水分裂反应电子和孔对和存储电子或孔。因此，在本研究中，我们Trie d将Cocatalyst，Ag或Pt加载到H2 - Evolution Photocatalyst，ZnRH_2O_4，在ZnRH_2O_4 / AG / Bi_4V_2O_（11）中，以增强该系统的光敏性。

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