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首页> 外文期刊>Inorganic Chemistry Frontiers >Activity enhancement of layered cobalt hydroxide nanocones by tuning interlayer spacing and phosphidation for electrocatalytic water oxidation in neutral solutions
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Activity enhancement of layered cobalt hydroxide nanocones by tuning interlayer spacing and phosphidation for electrocatalytic water oxidation in neutral solutions

机译：通过调节中性溶液中的层间间距和磷酸盐的层间间距和磷酸化合物氢氧化物纳米酮的活性增强

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摘要

Due to the low cost, abundant reserves and redox-active features, electrocatalysts based on 3d transition metals have been thoroughly evaluated and are considered promising candidates to the current commercial noble metal-based materials. Designing elaborate structures and favorable phase composition is regarded as effective to improve the activity in electrocatalysis. Herein, three kinds of layered cobalt hydroxide nanocones (NCs) with tunable interlayer spacing determined by the intercalated anion species were prepared. Because of the larger interlayer spacing which might be beneficial for faster mass transfer, dodecyl sulfate (DS-) ion-intercalated layered cobalt hydroxide NCs yielded current densities of 5 and 10.65 mA cm(-2) at overpotentials of 0.50 and 0.57 V, respectively, in the electrolytic oxygen evolution reaction (OER) in a neutral phosphate buffer solution (PBS); thus, they surpassed their counterparts with decreased layer distances induced by intercalated acetate (CH3COO-) or nitrate (NO3-) anions. When a further phosphidation treatment was adopted on NO3--intercalated cobalt hydroxide NCs, a cobalt phosphide (CoP) product with well-maintained conical morphology was obtained, which reduced the overpotential of similar to 20 mV to reach the anodic exchange current density of 5 mA cm(-2). The activity enhancement induced by the tuning of interlayer spacing and phosphidation offers great promise for developing high-activity catalysts by rationally designing phase structure and composition for electrochemical energy conversion.
机译：由于成本低，储量丰富和氧化还原活性特征，基于3D过渡金属的电催化剂已经彻底评估，并且被认为是目前商业贵金属基础材料的有希望的候选者。设计精细结构和有利的相组合物被认为有效改善电常分中的活性。在此，制备具有由插入阴离子物种确定的可调谐层间间隔的三种层状钴氢氧化物纳米酮（NCS）。由于较大的夹层间隔，这可能是更快的传质，硫酸十二烷基（DS-）离子插层的层状氢氧化物NCs分别在0.50和0.57V的过电位下产生5和10.65 mA（-2）的电流密度，在中性磷酸盐缓冲溶液（PBS）中的电解氧量进化反应（oer）中;因此，它们超越了它们的对应物，其具有由插入的醋酸酯（CH 3 COO）或硝酸盐（NO 3-）阴离子引起的减小的层距离。当在NO3 - 插层的氢氧化物NC上采用另外的磷酸化处理时，获得了具有良好保持锥形形态的磷化钴（COP）产品，其降低了类似于20 mV的过电位，以达到5的阳极交换电流密度MA CM（-2）。通过合理设计用于电化学能量转化的相位结构和组合物，调整中间间距和磷酸化的调整引起的活性增强为开发高活性催化剂提供了很大的希望。

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  • 来源
    《Inorganic Chemistry Frontiers》 |2019年第7期|共9页
  • 作者

    Qin Ruinan; Wan Hao; Liu Xiaohe; Chen Gen; Zhang Ning; Ma Renzhi; Qiu Guanzhou;

  • 作者单位

    Cent S Univ State Key Lab Powder Met Changsha 410083 Hunan Peoples R China;

    Cent S Univ State Key Lab Powder Met Changsha 410083 Hunan Peoples R China;

    Cent S Univ State Key Lab Powder Met Changsha 410083 Hunan Peoples R China;

    Cent S Univ State Key Lab Powder Met Changsha 410083 Hunan Peoples R China;

    Cent S Univ State Key Lab Powder Met Changsha 410083 Hunan Peoples R China;

    Natl Inst Mat Sci NIMS Int Ctr Mat Nanoarchitecton WPI MANA Namiki 1-1 Tsukuba Ibaraki 3050044 Japan;

    Cent S Univ Sch Resources Proc &

    Bioengn Changsha 410083 Hunan Peoples R China;

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  • 正文语种 eng
  • 中图分类 无机化学;
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