Recent Advances in the Comprehension and Regulation of Lattice Oxygen Oxidation Mechanism in Oxygen Evolution Reaction

Water electrolysis,a process for producing green hydrogen from renewable energy,plays a crucial role in the transition toward a sustainable energy landscape and the realization of the hydrogen economy.Oxygen evolution reaction(OER) is a critical step in water electrolysis and is often limited by its slow kinetics.Two main mechanisms,namely the adsorbate evolution mechanism(AEM) and lattice oxygen oxidation mechanism(LOM),are commonly considered in the context of OER.However,designing efficient c...     

固相研磨法制备Co-N掺杂介孔碳氧还原催化剂实验

以SBA-15为硬模板, Salen-Co为单一前驱物,采用固相研磨法合成了Co-N共掺杂石墨化的有序介孔碳材料(Co-N-C)。结果表明,实验所得到的Co-N-C-800在碱性介质中显示出了卓越的ORR的电催化活性,并呈现出优于Pt/C催化剂的抗甲醇性和稳定性。最重要的是,固相研磨法为有序介孔氧还原催化剂的制备提供了一种简便、省时、价格低廉的方法。     

CoAl LDH@Ni-MOF-74 S-Scheme Heterojunction for Efficient Hydrogen Evolution

Metal-organic frameworks (MOFs) and layered double hydroxides (LDHs) have been considered to be one of the most promising and worthy hot spot materials to devel...     

Ni-Doped BiVO4 with V4+ Species and Oxygen Vacancies for Efficient Photoelectrochemical Water Splitting

Bismuth vanadate is a promising photoanode material for photoelectrochemical(PEC)water splitting,but its activity and stability need to be further improved.In this work,we synthesized Ni-doped BiVO _(4 )abundant with V ~(4+)species and oxygen defects through an in situ electrodeposition method.The effective doping can decrease the particle size of BiVO _(4 )and lead to the formation of V ~(4+)species/oxygen defects.Accordingly,the doped and defective BiVO _(4 )showed high optical absorption and rapid charge transfer,and further showed much higher PEC activity than pure BiVO _4.Specifically,5-Ni-BiVO _(4 )exhibits the highest activity in PEC water splitting,with a photocurrent of 2.39 mA/cm ~(2 )at 1.23 V versus RHE(the reversible hydrogen electrode),which is 2.5 times higher than pure BiVO _4(0.94 m A/cm ~2),and much higher incident photon-to-current efficiency(IPCE)value of 45%(while only 25%for BiVO _(4 )at ca.400 nm).This work provides an in situ method for the development of a high-performance photoanode.     

Activation and self-repairing effectiveness of lubrication with nano-tin as additives

Micron grade Sn powder, VG32 oil and active pharmaceutical were mixed and the Nanometer Sn lubricant additives were prepared. Nanometer additives with different Sn concentrations were used in Steel-brass Tribo-pair for friction and wear test. The activating method to nano-Sn and surface of brass samples was investigated, and the method to form relatively thick friction coating on samples was discussed. Surface elemental distribution, coating thickness and its surface appearance were analyzed with X-ray photoelectron spectrum (XPS), auger electron spectrum (AES) and scanning electron microscope (SEM) respectively. The result shows that the ultra-thick friction coating (approx 20 μm), with abundant tin and well combined with substrate, has formed on the brass sample. The friction coating revealed superior performance of friction reducing and anti-wear properties. Therefore, the results possess practical significance to self-repair usage on steel-brass tribo-pair in mechanical systems.     

氧气起源及对生命进化的促进作用研究进展

在生物与地球化学演化史上,氧气的出现是最重要的历史事件,对生命进化产生了非常深远的影响.然而氧气起源时间及促进生命进化的分子机制等许多问题尚属未知,文章就该方面的研究进展进行了综述.     

协同Ni3N/Ni异质结构核和超薄Ni3N表面壳实现自适应的表面重构和高效析氧

寻找高活性、碱性稳定且具有极低过电位的非贵金属基析氧反应(OER)催化剂有巨大的价值,但由于OER缓慢的动力学,使其商业化面临相当大的挑战.本文中,我们通过一种自适应的表面重构方法设计了一种强耦合核壳纳米结构的预催化剂.该预催化剂由内部生长的Ni3N/Ni异质结构核和超薄Ni3N壳(Ni3N/Ni@Ni3N)组成,通过逐步的热氮化路径合成.Ni3N/Ni@Ni3N样品在电流密度10 mA·cm-2下展现出超低的过电位(229 mV),其在过电位270 mV下,电流密度为单独的Ni3N、Ni以及商业RuO2催化剂的17,37和20倍,同时具有较低的塔菲尔斜率(55 mV·dec-1).在OER过程中,Ni3N/Ni@Ni3N样品的表面发生了重构,生成了高活性的NiOOH.原位拉曼光谱和非原位电子显微镜的研究证实了这一点.密度泛函理论(DFT)计算结果表明,NiOOH到Ni3N的界面电子转移产生了带正电的Ni阳离子,大大降低了 OER中间产物吸附/脱附的能垒.     

High-Efficiency Catalytic Interface IrOx/CeO2 with Adsorbate Evolution Mechanism Boosts Oxygen Evolution Reaction in Acid Media

Oxygen evolution reaction(OER) in acid media has been intensively studied recently for its important role in proton exchange membrane electrolyzers.CeO₂-based nanomaterials have been widely used in various applications for their redox properties,oxygen vacancy,and surface activity.CeO₂-based nanocatalysts also exhibit superior catalytic performance in OER in acid media.Herein,we fabricated a highly efficient catalytic interface between IrO_x and CeO₂(Ir...     

赋值格为险象识别格的一种非经典逻辑系统K#(Ⅱ)

研究赋值格为非线性序的一种非经典逻辑低矺#.在该系统中,格结构不同于Boole代数,蕴涵算子→取Kleene-Dienes算子RKD.得到若干结果,特别是K#-准重言式恰是经典命题逻辑C2中的重言式,从而也等于C2中的定理,即QT(K#)=T(C2)=Φ├ .     

钠米钙钛矿复合氧化物的析氧电催化性质的研究

用循环伏安、线性伏安法等电化学方法研究了La0.8Sr0.2Fe1-yAlyO3系列氧化物对析氧反应的催化性质。     

CO_2活化法制备玉米芯基活性碳及其吸附性能

以可再生生物质玉米芯为原料,CO_2为活化剂,制得玉米芯基活性碳(ACs)。通过改变活化温度,进一步研究了ACs的孔隙结构对吸附性能的影响。结果表明:当活化温度为900℃时,ACs可获得最大的比表面积(1 427 m2/g),总孔容(0. 866 cm3/g)及发达的微孔结构,且ACs对亚甲基蓝的吸附有最大值;而当活化温度为800℃时,ACs具有最高的CO_2吸附值且极微孔含量丰富。ACs对CO_2的吸附能力主要取决于其极微孔含量,而与比表面积没有太大关系。     

从《天演论》中看跨文化传播对翻译的影响

以往认为跨文化传播主要受译者主体性指导下的翻译影响,但是翻译受译语读者和原文作品限制,必须在两者之间达到某种平衡,跨文化传播与翻译相互影响。严复《天演论》翻译从语言形式、意释典故和按语等方面进行意译,反观其翻译背景,主要受跨文化传播影响。这种功能翻译虽然达到了译者目的,但是过度意译却不利于跨文化传播。     

格值自动机与格值正则文法

给出了格值文法的定义与分类，对格值正则文法与自动机的关系作了详细讨论，得出了两个重要的结论，即：由给定的格值正则文法可以构造一个格值自动机使二者接受的语言集相同；反之亦然．     

Comparative Electrocatalytic Oxygen Evolution Reaction Studies of Spinel NiFe2O4 and Its Nanocarbon Hybrids

Electrocatalytic oxygen evolution reaction(OER) is one of the crucial reactions for converting renewable electricity into chemical fuel in the form of hydrogen.To date,there is still a challenge in designing ideal cost-effective OER catalysts with excellent activity and robust durability.The hybridization of transition metal oxides and carbonaceous materials is one of the most effective and promising strategies to develop high-performance electrocatalysts.Herein,this work synthesized hybrids of ...     

《所罗们之歌》场景描写与悲剧精神阐释

文学作品中的场景是对人物和情节在特定环境中发展的综合描写。诺贝尔文学奖惟一黑人女性得主托尼·莫里森的小说《所罗们之歌》中的场景描写精彩纷呈,大致可分为描写性、象征性和感知性三个方面。而对这些场景的悲剧性描写和处理,高扬了贯穿欧关思想文化历史几千年的悲剧精神。     

赋值格为菱形格的4值逻辑系统GR_4~1

研究赋值格为非线性序,蕴涵算子→取Gaines－Rescher的RGR的一种4值逻辑系统GR14,得到若干结果．特别是,在系统GR14中,α－MP规则都成立（α＞0）;GR14重言式必是GR14-准重言式,GR14-准重言式必是C2-重言式,即一个公式是GR14中的重言式当且仅当它既是I-重言式又是J-重言式,即．     

Layer-Contacted Graphene-Like BN/Ultrathin Bi3O4Br Stacking for Boosting Photocatalytic Molecular Oxygen Activation

Novel graphene-like boron nitride(BN)/Bi₃O₄ Br photocatalysts have been controllably synthesized through a facile solvothermal method for the first time. Layer contact stacking between graphene-like BN and ultrathin Bi₃O₄ Br was achieved with strong interaction. Dehalogenation is designed to harvest more visible light, and the ultrathin structure of Bi₃O₄ Br is designed to accelerate charge transfer from inside to the surface. Aft...     

闪锌矿结构晶格中的孤子激发

利用多重尺度和准离散近似法研究了双原子链(相邻两原子质量不同，作用力常数交替变化)中的孤子激发。该模型模拟了闪锌矿结构晶格沿<111>方向的振动.考虑二次方和四次方作用势，得到了特殊波矢下定态孤子解的表达式.由于该晶格模型的弱对称性，其原子位移分布与文献中广泛研究的一维单原子、双原子和金刚石晶格有所不同.     

Oxygen deprivation as a drive state in an aquatic insect: Family Dytiscidae

Thirty aquatic diving beetles,Rhantus atncolor, of the family Dytiscidae, were subjected to 1-, 5-, 10-, 15-, 20-, and 25-min levels of oxygen deprivation. The level of deprivation was procured by submerging the Ss under water for the allotted period of time. A control group receiving no oxygen deprivation was also tested. The results clearly established oxygen deprivation as a drive state capable of increasing the general level of activity in aquatic Coleoptera as measured by swimming speed in the runway. Significant differences were also found between these deprivation levels.