摘要：Photocatalytic water splitting based on semiconductor photocatalysts is a promising approach for producing carbon‐neutral,sustainable,and clean H_(2) *** loading,which is an appealing strategy,has been extensively employed to improve the photocatalytic efficiency *** view of the high cost and rare preservation of noble metal cocatalysts that significantly hinder their utilization for large‐scale energy production,various cocatalysts comprising earth‐abundant ele‐ments have been developed as noble‐metal‐free candidates using different methods to boost pho‐tocatalytic water *** these preparation strategies,photodeposition has attracted tre‐mendous attention in the deposition of earth‐abundant cocatalysts owing to its simplicity and mod‐erate availability,improved interfacial charge separation and transfer,and abundant active sites on the *** this review,we first summarize the deposition principles,deposition advantages,categories of cocatalysts,roles of cocatalysts,influencing factors,modification strategies,and design considerations in the photodeposition of earth‐abundant *** photodeposited earth‐abundant cocatalysts for the photocatalytic H_(2) evolution half reaction,photocatalytic O_(2) evo‐lution half reaction,and overall photocatalytic water splitting are ***,some perspec‐tives on the challenges and possible future directions for the photodeposition of earth‐abundant cocatalysts in photocatalytic water splitting are presented.

摘要：The active sites of monodisperse transition metal Ni-clusters were anchored on carbon nitride(CN)by an in situ photoreduction deposition method to promote the efficient separation of photogenerated charges and achieve high-efficiency photocatalytic activity for hydrogen *** Ni-cluster/CN exhibited a photocatalytic hydrogen production rate of 16.5 mmol·h^(-1)·g^(-1) and a total turnover frequency(TOF(H_(2)))value of 461.14 h^(-1).X-ray absorption spectroscopy based on synchrotron radiation indicated that CN had two reaction centers to form stable interface interactions with monodispersed Ni-clusters,in which carbon can act as an electron acceptor,while nitrogen can act as an electron ***,the hybrid electronic structure of the Ni-cluster/CN system was constructed,which was favorable for photocatalytic activity for hydrogen *** in-depth understanding of the interfacial interaction between CN and Ni-clusters will have important reference significance on the mechanistic study of development based on the cocatalyst.

摘要：Oxidized nanoporous g-C3N4(PCNO)decorated with graphene oxide quantum dots(ox-GQDs)was successfully prepared by a facile self-assembly *** co-catalysts,the ultrasmall zero-dimensional(0 D)ox-GQDs can achieve uniform dispersion on the surface/inner channels of PCNO,as well as intimate contact with PCNO through hydrogen bonding,π-π,and chemical bonding *** contrast with PCNO,the ox-GQDs/PCNO composite photocatalysts possessed improved light-harvesting ability,higher charge-transfer efficiency,enhanced photooxidation capacity,and increased amounts of reactive species due to the upconversion properties,strong electron capturing ability,and peroxidase-like activity of the ***,the visible-light photocatalytic degradation and disinfection performances of the ox-GQDs/PCNO composite were significantly ***,the composite with a 0.2 wt.% deposited amount of ox-GQDs(ox-GQDs-0.2%/PCNO)exhibited optimum amaranth photodegradation activity,with a corresponding rate about 3.1 times as high as that of *** addition,ox-GQDs-0.2%/PCNO could inactivate about 99.6%of Escherichia coli(***)cells after 4 h of visible light irradiation,whereas only^31.9% of *** cells were killed by ***,h+,·O2-,and·OH were determined to be the reactive species generated in the photocatalytic process of the ox-GQDs/PCNO system;these species can thoroughly mineralize azo dyes and effectively inactivate pathogenic bacteria.

摘要：过氧化氢(H_(2)O_(2))是一种重要的化工产品,广泛应用于污水处理、消毒杀菌和印染漂白等领域.在蒽醌法生产H_(2)O_(2)的过程中,易产生有毒气体并存在爆炸危险.因此,仅利用水、氧气和太阳光即可在合适的光催化剂上生成H_(2)O_(2)的光催化技术备受关注.本课题组报道了通过酸碱自组装法制备的四(4-羧基苯基)卟啉(SA-TCPP)光催化剂,用于生产H_(2)O_(2).该催化剂克服了大部分H_(2)O_(2)光催化剂存在的需要牺牲剂、活性低和光利用率不足等问题,但其性能仍受限于较高的复合率.晶面调控已被证实是改善许多无机催化剂电荷复合的有效策略,然而,对于有机光催化剂,关于暴露晶面与其活性关系的研究仍然较少.本文采用溶解-重结晶法在水和三种有机溶剂的混合物中成功合成了三种具有不同暴露晶面的卟啉光催化剂.即利用卟啉在有机溶剂和水中的溶解度差异,将卟啉先溶解在四氢呋喃(THF)、甲醇(MeOH)或乙二醇(EG)溶液中,随后在水溶液中重新结晶.X射线衍射、高分辨率透射电子显微镜及晶面模拟模型图的结果表明,三种催化剂具有相同的晶体结构,但分别暴露了(400)、(022)和(020)晶面.通过紫外分光光度计测量这些催化剂在氙灯(λ≥420 nm)照射下的光催化活性,结果表明,具有(400)暴露面的卟啉光催化剂的H_(2)O_(2)生产速率最高,可达29.33 mmol L h^(-1)g^(-1),分别是具有(022)暴露面和(020)暴露面的卟啉光催化剂的2.7倍和4.1倍,约是已报道的SA-TCPP光催化剂的1.3倍.通过紫外漫反射、莫特肖特基曲线分析以及LED灯照射下的光催化活性测试,排除了光吸收能力对这三种卟啉光催化剂活性的影响.开尔文探针力显微镜、光生电流密度谱图、晶面模拟模型图和密度泛函理论计算结果表明,活性的差异主要归因于(400)表面暴露的高羧基含量所引发的强内建电场,并且在该暴露面上的内建电场方向有利于空穴从吡咯氮向羧基碳的跃迁,因此阻碍了电荷的快速重组,促进了富有挑战性的水氧化过程,而(020)面由于暴露了最多的吡咯氮和最少的羧基碳,其产生的内建电场强度最弱,且内建电场方向阻碍了空穴向羧基碳的跃迁,因此H_(2)O_(2)生产速率最低.综上所述,本工作通过晶面调控产生强内建电场以加速空穴的迁移,降低了电子空穴复合速率,实现了高H_(2)O_(2)生产速率,为更高效的有机光催化剂的设计和开发提供了新思路.

摘要：基于地方高校对人才培养模式的改革需求,利用“微助教”平台探讨了“以成果为导向,以学生为中心”的“物理化学”课程线上线下混合式教学模式的改革与实践,即从教学设计、教学方法、教学内容及教学考核与评价等方面实施改革,构建“物理化学”课程的新型教学模式。实践表明,该教学模式能够提高“物理化学”课程的教学质量,激发学生的学习兴趣,培养学生自主学习能力和创新能力,提高学生解决实际问题的综合能力,提高人才培养质量。

摘要：我国于2003年7月1起在全国范围内推行工程量清单计价模式，这是我国工程造价计价模式的一次重大改革，从而也带动了招投标管理机制的变革。与此同时，在当前国家实行宏观经济调控政策，强力推行抑制经济过快增长的条件下，导致建筑市场呈现了“僧多粥少”的局面。那么，如何在强手如林、承包商投标竞争非常激烈的大环境下脱颖而出，赢得工程项目的承包权，

摘要：北京电子能谱中心是国家大型科学仪器中心,是科技部认定的国家级平台之一,实验室安全稳定运行为国家科研发展提供了有力的支撑。北京电子能谱中心努力探索在复杂多功能实验环境中的安全管理保障,建设有特色的实验室安全管理制度和实验室安全设计系统。

摘要：IEEE802.3af规范定义了一种允许通过以太网线缆输送DC电源的方法。首先简要介绍以太网供电系统的构成,详细介绍以太网供电设备及其功能。然后,阐述受电设备及其特性,给出一些可用的芯片供设计时参考。

摘要：建立科学公正的实验室综合效益评价体系,是实验室健康可持续发展的前提,是生态大学建设的内在要求。本文以生态大学办学理念为指导,提出实验室综合效益评价体系的设计目标,并尝试构建实验室综合效益评价体系模型。

摘要：MPC852T 是 MPC866　PowerQUICC 系列的一款嵌入式通信处理器,它采用双处理器结构,支持嵌入式 L i n u x 操作系统, 具有非常优秀的性能,广泛应用于通信领域。无线接入点 A P 是实现无线局域网移动功能的关键部分,它在无线网络中为移动主机提供了 Internet 与其它外部网等服务,实现数据在无线网络和有线网络之间的互相转发。