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Nickel induced electronic structural regulation of cobalt hydroxide for enhanced water oxidation
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020/03/13 , DOI: 10.1039/d0ta00010h Yuan Wang 1, 2, 3, 4 , Chenxi Yang 4, 5, 6 , Yunxia Huang 1, 2, 3, 4 , Zhimin Li 1, 2, 3, 4 , Zuozhong Liang 4, 7, 8, 9 , Guozhong Cao 10, 11, 12, 13
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020/03/13 , DOI: 10.1039/d0ta00010h Yuan Wang 1, 2, 3, 4 , Chenxi Yang 4, 5, 6 , Yunxia Huang 1, 2, 3, 4 , Zhimin Li 1, 2, 3, 4 , Zuozhong Liang 4, 7, 8, 9 , Guozhong Cao 10, 11, 12, 13
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Cobalt-based hydroxides have been extensively investigated as catalysts for water oxidation. It is well known that the addition of Fe can dramatically enhance the oxygen evolution reaction (OER) performance of Co-based materials; however, the role of Ni doping in Co-based materials for the OER is not well understood, though a similar enhancement was anticipated. In the present study, hexagonal Co(OH)2 nanosheets were synthesized with various concentrations of Ni-doping. Detailed structural and electrochemical characterization revealed that Ni0.25Co0.75(OH)2 shows the best OER performance, with an enhanced overpotential of 40 mV at j = 10 mA cm−2 compared to Co(OH)2. Theoretical calculations, experimental characterization and electrochemical analysis together demonstrate that the introduction of Ni could reduce the band gap, and decrease the numbers of valence electrons and active O–H and Co–O–H groups of the host Co(OH)2, thus improving the conductivity, charge transfer, and catalytic kinetics, consequently enhancing the OER performance.
中文翻译：
镍诱导的氢氧化钴电子结构调节，以增强水的氧化
钴基氢氧化物已被广泛研究用作水氧化的催化剂。众所周知，添加铁可以显着提高钴基材料的氧析出反应（OER）性能。然而，尽管人们预计会出现类似的增强作用，但对于在OER的Co基材料中掺杂Ni的作用还知之甚少。在本研究中，合成了六角形的Co（OH）2纳米片，其中掺杂了各种浓度的Ni。详细的结构和电化学表征显示，Ni 0.25 Co 0.75（OH）2显示出最佳的OER性能，与Co（OH）2相比，在j = 10 mA cm -2时增强了40 mV的过电势。理论计算，实验表征和电化学分析共同表明，引入Ni可以减小带隙，并减少价电子以及主体Co（OH）2的活性O-H和Co-O-H基团的数量，因此改善电导率，电荷转移和催化动力学，从而提高OER性能。
更新日期：2020-04-08
中文翻译：
镍诱导的氢氧化钴电子结构调节，以增强水的氧化
钴基氢氧化物已被广泛研究用作水氧化的催化剂。众所周知，添加铁可以显着提高钴基材料的氧析出反应（OER）性能。然而，尽管人们预计会出现类似的增强作用，但对于在OER的Co基材料中掺杂Ni的作用还知之甚少。在本研究中，合成了六角形的Co（OH）2纳米片，其中掺杂了各种浓度的Ni。详细的结构和电化学表征显示，Ni 0.25 Co 0.75（OH）2显示出最佳的OER性能，与Co（OH）2相比，在j = 10 mA cm -2时增强了40 mV的过电势。理论计算，实验表征和电化学分析共同表明，引入Ni可以减小带隙，并减少价电子以及主体Co（OH）2的活性O-H和Co-O-H基团的数量，因此改善电导率，电荷转移和催化动力学，从而提高OER性能。
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