当前位置：
X-MOL 学术
›
ACS Sustain. Chem. Eng.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Invigorating the Catalytic Activity of Cobalt Selenide via Structural Phase Transition Engineering for Lithium–Oxygen Batteries
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-03-25 , DOI: 10.1021/acssuschemeng.9b06703 Minglu Li 1 , Chaozhu Shu 1 , Anjun Hu 2 , Jiabao Li 1 , Ranxi Liang 1 , Jianping Long 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-03-25 , DOI: 10.1021/acssuschemeng.9b06703 Minglu Li 1 , Chaozhu Shu 1 , Anjun Hu 2 , Jiabao Li 1 , Ranxi Liang 1 , Jianping Long 1
Affiliation
|
For the purpose of reducing kinetic obstacles of the oxygen evolution reaction and oxygen reduction reaction in rechargeable lithium–oxygen (Li–O2) batteries, there is an urgent need for cost-effective and durable high-efficiency electrocatalysts. Descriptors of catalytic activity, local coordination environments, and electronic structures of transition-metal dichalcogenides can be modulated via phase transition engineering. Here, we report the strategy to induce transition of CoSe2 from the cubic phase to the orthorhombic phase via phosphorus doping. The weak electronegativity of phosphorus as compared to selenium is beneficial for adjusting the amount of d electrons on the Co cation and thus has a significant contribution to structural phase transition and the electrocatalytic activity. As a result, the Li–O2 battery with the phosphorus-doped orthogonal phase CoSe2 (o-CoSe2|P) electrode exhibits excellent rate capability (with a low overpotential of only 0.44 V at the current density of 50 mA g–1) and cyclability (500 cycles). These experimental results prove that phase transition engineering is an effective strategy for obtaining highly efficient catalysts.
中文翻译：
通过结构相变工程提高锂-氧电池对硒化钴的催化活性
为了减少可再充电锂-氧（Li-O 2）电池中氧释放反应和氧还原反应的动力学障碍，迫切需要经济高效且耐用的高效电催化剂。可以通过相变工程调节催化活性，局部配位环境和过渡金属二卤化物电子结构的描述。在这里，我们报告诱导CoSe 2过渡的策略通过磷掺杂从立方相到正交相。与硒相比，磷的弱电负性有利于调节Co阳离子上的d电子数量，因此对结构相变和电催化活性具有重大贡献。结果，带有磷掺杂的正交相CoSe 2（o-CoSe 2 | P）电极的Li–O 2电池具有出色的倍率能力（在50 mA g的电流密度下只有0.44 V的低过电位– 1）和可循环性（500个循环）。这些实验结果证明，相变工程是获得高效催化剂的有效策略。
更新日期：2020-03-26
中文翻译：
通过结构相变工程提高锂-氧电池对硒化钴的催化活性
为了减少可再充电锂-氧（Li-O 2）电池中氧释放反应和氧还原反应的动力学障碍，迫切需要经济高效且耐用的高效电催化剂。可以通过相变工程调节催化活性，局部配位环境和过渡金属二卤化物电子结构的描述。在这里，我们报告诱导CoSe 2过渡的策略通过磷掺杂从立方相到正交相。与硒相比，磷的弱电负性有利于调节Co阳离子上的d电子数量，因此对结构相变和电催化活性具有重大贡献。结果，带有磷掺杂的正交相CoSe 2（o-CoSe 2 | P）电极的Li–O 2电池具有出色的倍率能力（在50 mA g的电流密度下只有0.44 V的低过电位– 1）和可循环性（500个循环）。这些实验结果证明，相变工程是获得高效催化剂的有效策略。
京公网安备 11010802027423号