【摘 要】
：
The transition metal-based materials have been regarded as promising electrocatalysts for oxygen evolution reaction(OER).However,achieving higher efficiency is largely limited by the valence states of metal species.Herein,different graphdiyne(GDY)-nickel
【机 构】
：
Science Center for Material Creation and Energy Conversion,School of Chemistry and Chemical Engineer
论文部分内容阅读
The transition metal-based materials have been regarded as promising electrocatalysts for oxygen evolution reaction(OER).However,achieving higher efficiency is largely limited by the valence states of metal species.Herein,different graphdiyne(GDY)-nickel composites were designed and synthesized[Ni(OH)2/GDY,NiOOH/GDY and NiOx/GDY]as the electrocatalysts for OER.The NiOx/GDY possessing the mixed valence states can drive the OER more efficiently than Ni(OH)2/GDY and NiOOH/GDY.NiOx/GDY gives the smallest overpotential of 310 mV at 10 mA/cm2 for OER,which is even superior to commercial RuO2 electrocatalyst.Experimental results reveal that not only the fast charge transfer induced by GDY but also the prominent roles of mixed Ni2+/Ni3+valence states boost the OER electrocatalytic performances.The presence of the mixed valence state was demonstrated to be helpful for the charge transfer,resulting in the enhancement of the catalytic activity.This work may provide a new direction to design and fabricate high-performance materials for OER and beyond.
其他文献
Graphdiyne(GDY)is a kind of two-dimensional carbon nanomaterial with specific configurations of sp and sp2 carbon atoms.The key progress in the preparation and application of GDY is bringing carbon materials to a brand-new level.Here,the various propertie
Atomic catalysts(Acs)consisting of zero-valent metal atoms anchored on supporting materials have shown promising potentials in catalysis and energy conversion due to their higher atomic utilization,higher selectivity,activity and durability toward target
The synergistic effect can help improve the electrocatalyst performances by combining the advantages of individual components.In particular,such an effect has been more important in the atomic catalysts.In this review,we have summarized the synergistic ef
通过对某地面气象观测场一起雷击造成主采集器和温湿分采集器等设备故障的原因分析,确定雷击的原因以便有针对性地进行整改.通过对温湿分采集器故障部位进行检修分析,结合估计雷电对电子设备损害的可能途径,综合闪电定位资料、天气过程、业务数据中断时间、具体损坏设备部位等资料,以设备损坏部位为导向,运用尽可能的定量分析和有针对性的定性分析,得出值班室备份站光猫和值班电脑RS232接口损坏是由于长距离架空供电线路感应雷电高压脉冲入侵所致;观测场主采集器和温湿分采集器的软损伤是由于雷电在观测场东北接闪塔接闪,强大的雷电电磁
以珠海高新区试点区域雷电灾害风险评估为例,采用广东省雷电监测网1999-2019年地闪资料作为雷电风险评价的主要基础参数,以层次分析法和灰类白化权函数分析法为原理,综合考虑闪电密度、人口密度、使用性质等21项风险指标,通过建立区域雷电风险评价计算模型,得出居住生活区、先进制造业区和新型产业区等3个评估子区域为高风险,物流运输区为中等风险的结论.评估结果说明本评估方法能够适应区域产业布局的特点,能用于指导技术人员开展区域评估工作,提供借鉴和方法.
As a new carbon allotrope,graphdiyne(GDY)has shown intensive practical application prospects in the energy field,catalysis,gas separation,etc.,due to its unique 2D π-conjugated structure,rich sp-hybridized carbon atoms and semiconductor characteristics.Co
针对增城的气象为农服务方式单一、科普工作覆盖面不够、服务水平存在差距、气象灾害发生时应对措施较为落后、农户对相关的气象知识了解不够等问题,建议拓展气象为农服务的方式,着力提高农业气象灾害预报针对性和精准性,增加农业气象科普次数,切实为推动增城现代化农业发展以及农村经济建设提供科学的支撑.
利用无人机悬挂金属球实现对X波段双极化相控阵天气雷达双通道强度一致性定标,根据雷达特点设计无人机飞行轨迹,通过对广州4部雷达开展金属球定标试验,经过反复测试发现:当不受外界干扰时,差分反射率Zdr标准方差小于0.1 dB,多次平均值波动范围小于0.2 dB,通过修正使Zdr误差小于0.2 dB,满足业务技术指标要求;当受到外界干扰开展金属球定标时,同一仰角多次试验的数据波动范围均超过0.2 dB,标准方差均大于0.15 dB,表明金属球定标受遮挡角、风速等外界因素干扰较大,不能满足业务定标要求,在开展金属
Carbon-based magnetic semiconductors are easy to be modified with low cost and low power consumption.While they can demonstrate robust long-range magnetic ordering and show great potential for application after introducing magnetic moments.Graphdiyne(GDY)
The carbon-based metal-free catalyst is one of the ideal alternatives to Pt as electrocatalysts for oxygen reduction reaction,which can reduce the cost of fuel cells and zinc-air batteries.Here,graphdiyne(GDY),a carbon material with uneven charge distribu