Photocatalytic Z-scheme water splitting is considered as a promising approach to produce solar hydrogen.However,the forward hydrogen production reaction is often impeded by backward reactions.In the present study,in a...Photocatalytic Z-scheme water splitting is considered as a promising approach to produce solar hydrogen.However,the forward hydrogen production reaction is often impeded by backward reactions.In the present study,in a photosystem Ⅱ-integrated hybrid Z-scheme water splitting system,the backward hydrogen oxidation reaction was significantly suppressed by loading a PtCrOx cocatalyst on a ZrO2/TaON photocatalyst.Due to the weak chemisorption and activation of molecular hydrogen on PtCrOx,where Pt is stabilized in the oxidized forms,Pt^Ⅱ and Pt^Ⅳ,hydrogen oxidation is inhibited.However,it is remarkably well-catalyzed by the metallic Pt cocatalyst,thereby rapidly consuming the produced hydrogen.This work describes an approach to inhibit the backward reaction in the photosystem Ⅱ-integrated hybrid Z-scheme water splitting system using Fe(CN)6^3-/Fe(CN)6^4-redox couple as an electron shuttle.展开更多
At least since Hegel identified Heraclitus as a philosopher who dealt with becoming, it has seemed obvious to perhaps most scholars that he was in some way a philosopher of process rather than a philosopher of being. ...At least since Hegel identified Heraclitus as a philosopher who dealt with becoming, it has seemed obvious to perhaps most scholars that he was in some way a philosopher of process rather than a philosopher of being. （For the views of Hegel and some early interpreters, see Graham 1997, 46-50.） Indeed, ancient sources say that for him all things are in flux, and one cannot step twice into the same stream. Yet for all that, many interpreters of Heraclitus perhaps unwittingly portray him in ways that are inconsistent with his being a process philosopher. And there are those who wish to downplay the role of flux in his system as well. In any case, to call him a process philosopher remains a vague claim until an interpreter specifies in what sense he is committed to process. Even more important, perhaps, is the question whether Heraclitus can maintain a coherent theory of process, given interpretations both ancient and modem that portray him as violating the principle of non-contradiction---often precisely because of his theory of flux. In this paper I shall attempt to argue that Heraclitus is indeed a process philosopher, and more importantly to spell out in what way he is, and to defend his theory as a consistent and indeed philosophically sound starting point for understanding the world as a process; I will end by pointing out some ways in which his theory accords with modem scientific explanations of the world.展开更多
基金supported by the Strategic Priority Research Program of Chinese Academy of Sciences(XDB17000000)the Key Research Program of Frontier Sciences,CAS(QYZDY-SSW-JSC023)+1 种基金the National Natural Science Foundation of China(21603224,31470339)the National Key R&D Program of China(2017YFA0503700)~~
文摘Photocatalytic Z-scheme water splitting is considered as a promising approach to produce solar hydrogen.However,the forward hydrogen production reaction is often impeded by backward reactions.In the present study,in a photosystem Ⅱ-integrated hybrid Z-scheme water splitting system,the backward hydrogen oxidation reaction was significantly suppressed by loading a PtCrOx cocatalyst on a ZrO2/TaON photocatalyst.Due to the weak chemisorption and activation of molecular hydrogen on PtCrOx,where Pt is stabilized in the oxidized forms,Pt^Ⅱ and Pt^Ⅳ,hydrogen oxidation is inhibited.However,it is remarkably well-catalyzed by the metallic Pt cocatalyst,thereby rapidly consuming the produced hydrogen.This work describes an approach to inhibit the backward reaction in the photosystem Ⅱ-integrated hybrid Z-scheme water splitting system using Fe(CN)6^3-/Fe(CN)6^4-redox couple as an electron shuttle.
文摘At least since Hegel identified Heraclitus as a philosopher who dealt with becoming, it has seemed obvious to perhaps most scholars that he was in some way a philosopher of process rather than a philosopher of being. （For the views of Hegel and some early interpreters, see Graham 1997, 46-50.） Indeed, ancient sources say that for him all things are in flux, and one cannot step twice into the same stream. Yet for all that, many interpreters of Heraclitus perhaps unwittingly portray him in ways that are inconsistent with his being a process philosopher. And there are those who wish to downplay the role of flux in his system as well. In any case, to call him a process philosopher remains a vague claim until an interpreter specifies in what sense he is committed to process. Even more important, perhaps, is the question whether Heraclitus can maintain a coherent theory of process, given interpretations both ancient and modem that portray him as violating the principle of non-contradiction---often precisely because of his theory of flux. In this paper I shall attempt to argue that Heraclitus is indeed a process philosopher, and more importantly to spell out in what way he is, and to defend his theory as a consistent and indeed philosophically sound starting point for understanding the world as a process; I will end by pointing out some ways in which his theory accords with modem scientific explanations of the world.
