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Understanding the Effect of Nickel Doping in Cobalt Spinel Oxides on Regulating Spin State to Promote the Performance of the Oxygen Reduction Reaction and Zinc–Air Batteries
ACS Energy Letters ( IF 19.3 ) Pub Date : 2022-11-22 , DOI: 10.1021/acsenergylett.2c02457 Shuo Liu 1 , Baoshan Zhang 1 , Yu Cao 1 , Huili Wang 1 , Yiming Zhang 1 , Shaojie Zhang 1 , Yanting Li 1 , Haochen Gong 1 , Shizhen Liu 2 , Zhanxu Yang 3 , Jie Sun 1
ACS Energy Letters ( IF 19.3 ) Pub Date : 2022-11-22 , DOI: 10.1021/acsenergylett.2c02457 Shuo Liu 1 , Baoshan Zhang 1 , Yu Cao 1 , Huili Wang 1 , Yiming Zhang 1 , Shaojie Zhang 1 , Yanting Li 1 , Haochen Gong 1 , Shizhen Liu 2 , Zhanxu Yang 3 , Jie Sun 1
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Metal-doped cobalt spinel oxides are considered to be effective materials to improve the oxygen reduction reaction (ORR) performance. However, the doping sites of nickel in Co3O4 spinel (octahedral sites or tetrahedral sites) remain controversial, leading to a poor understanding of the effects of nickel. Herein, directionally introducing nickel into the octahedral sites of Co3O4 (NiOh-Co3O4) is proposed by exploiting the different redox capabilities of different nickel sources, which yields an encouraging ORR and rechargeable Zn–air battery performance. Magnetic measurements and theoretical calculations reveal that the nickel occupied at the octahedral site can effectively promote the spin-state transition from low spin to higher spin states for cobalt ions and the hybridization of Co 3d–O 2p electrons, resulting in the optimization of the adsorption strength for the oxygen intermediates, thus improving the oxygen catalytic activity of NiOh-Co3O4.
中文翻译：
了解在钴尖晶石氧化物中掺杂镍对调节自旋状态以促进氧还原反应和锌空气电池性能的影响
金属掺杂钴尖晶石氧化物被认为是提高氧还原反应（ORR）性能的有效材料。然而，镍在Co 3 O 4尖晶石中的掺杂位点（八面体位点或四面体位点）仍存在争议，导致人们对镍的影响认识不足。在此，将镍定向引入Co 3 O 4 的八面体位点（ Ni O h -Co 3 O 4) 是通过利用不同镍源的不同氧化还原能力提出的，这产生了令人鼓舞的 ORR 和可充电锌空气电池性能。磁性测量和理论计算表明，占据八面体位置的镍可以有效促进钴离子从低自旋态到高自旋态的自旋态转变和 Co 3d–O 2p 电子的杂化，从而优化吸附氧中间体的强度，从而提高Ni O h -Co 3 O 4的氧催化活性。
更新日期：2022-11-22
中文翻译：
了解在钴尖晶石氧化物中掺杂镍对调节自旋状态以促进氧还原反应和锌空气电池性能的影响
金属掺杂钴尖晶石氧化物被认为是提高氧还原反应（ORR）性能的有效材料。然而，镍在Co 3 O 4尖晶石中的掺杂位点（八面体位点或四面体位点）仍存在争议，导致人们对镍的影响认识不足。在此，将镍定向引入Co 3 O 4 的八面体位点（ Ni O h -Co 3 O 4) 是通过利用不同镍源的不同氧化还原能力提出的，这产生了令人鼓舞的 ORR 和可充电锌空气电池性能。磁性测量和理论计算表明，占据八面体位置的镍可以有效促进钴离子从低自旋态到高自旋态的自旋态转变和 Co 3d–O 2p 电子的杂化，从而优化吸附氧中间体的强度，从而提高Ni O h -Co 3 O 4的氧催化活性。
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