当前位置: X-MOL 学术J. Electroanal. Chem. › 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.)
High-efficient preparation and screening of electrocatalysts using a closed bipolar electrode array system
Journal of Electroanalytical Chemistry ( IF 4.5 ) Pub Date : 2019-01-01 , DOI: 10.1016/j.jelechem.2018.10.025
Jia-Dong Zhang , Nan Hao , Lei Lu , Shan Yun , Xiu-Fang Zhu , Kun Hong , Liang-Dong Feng

Abstract High-efficient preparation and screening of electrocatalysts for oxygen reduction reaction (ORR) was realized by a three electrode driving closed bipolar electrode (BPE) array system. As high concentrations of Fe(CN)63−/4− (both 200 mM) existed in the anodic cell of the BPE system and same electrode material was adopted by the BPE anodic pole and driving electrode in anodic cell, the anodic cell performed similar to “good conductor” and the electrochemical behavior of the closed BPE system approximately equal to that of the three-electrode system in cathodic cell. Based on the above property and the parallel array, electrocatalysts containing bimetallic Pt Au and reduced graphene oxide (PtAu-rGO) with varying metal proportion were successfully prepared on the cathodic BPE poles by a two-step reduction process. Graphene oxide was firstly reduced to reduced graphene oxide (rGO) in each cathodic pole by cyclic voltammetry, and then Pt Au with different metal proportion were electrodeposited on the surface of rGO. Afterward, in-situ and high-throughput screening of these electrocatalysts for ORR was carried out based on the electrochemiluminescence (ECL) imaging on the corresponding anodic BPE poles. The screening results were consistent with those of the conventional electrochemical method by testing the catalytic performance one by one very well. This closed BPE array system with one potentiostat not only can prepare multiple catalyst candidates at the same time, but also can evaluate them, simultaneously, which is of great immediate significance to the field of fuel cell.

中文翻译:

使用封闭双极电极阵列系统高效制备和筛选电催化剂

摘要 通过三电极驱动闭合双极电极(BPE)阵列系统实现了氧还原反应(ORR)电催化剂的高效制备和筛选。由于 BPE 系统的阳极电池中存在高浓度的 Fe(CN)63-/4-(均为 200 mM),并且 BPE 阳极和阳极电池中的驱动电极采用相同的电极材料,因此阳极电池的性能相似到“良导体”和封闭 BPE 系统的电化学行为大约等于阴极电池中的三电极系统的电化学行为。基于上述性质和平行阵列,通过两步还原过程在阴极BPE极上成功制备了含有不同金属比例的双金属Pt Au和还原氧化石墨烯(PtAu-rGO)的电催化剂。首先通过循环伏安法在每个阴极将氧化石墨烯还原为还原氧化石墨烯(rGO),然后在 rGO 表面电沉积不同金属比例的 Pt Au。然后,基于相应阳极 BPE 极上的电化学发光 (ECL) 成像对这些电催化剂进行 ORR 的原位和高通量筛选。通过对催化性能的逐一测试,筛选结果与常规电化学方法的筛选结果一致。这种具有一个恒电位仪的封闭BPE阵列系统不仅可以同时制备多个候选催化剂,而且可以同时评估它们,这对燃料电池领域具有重要的直接意义。然后在rGO表面电沉积不同金属比例的Pt Au。然后,基于相应阳极 BPE 极上的电化学发光 (ECL) 成像对这些电催化剂进行 ORR 的原位和高通量筛选。通过对催化性能的逐一测试,筛选结果与常规电化学方法的筛选结果一致。这种具有一个恒电位仪的封闭BPE阵列系统不仅可以同时制备多个候选催化剂,而且可以同时评估它们,这对燃料电池领域具有重要的直接意义。然后在rGO表面电沉积不同金属比例的Pt Au。然后,基于相应阳极 BPE 极上的电化学发光 (ECL) 成像对这些电催化剂进行 ORR 的原位和高通量筛选。通过对催化性能的逐一测试,筛选结果与常规电化学方法的筛选结果一致。这种具有一个恒电位仪的封闭BPE阵列系统不仅可以同时制备多个候选催化剂,而且可以同时评估它们,这对燃料电池领域具有重要的直接意义。基于相应阳极 BPE 极上的电化学发光 (ECL) 成像,对这些电催化剂的 ORR 进行了原位和高通量筛选。通过对催化性能的逐一测试,筛选结果与常规电化学方法的筛选结果一致。这种具有一个恒电位仪的封闭BPE阵列系统不仅可以同时制备多个候选催化剂,而且可以同时评估它们,这对燃料电池领域具有重要的直接意义。基于相应阳极 BPE 极上的电化学发光 (ECL) 成像,对这些电催化剂的 ORR 进行了原位和高通量筛选。通过对催化性能的逐一测试,筛选结果与常规电化学方法的筛选结果一致。这种具有一个恒电位仪的封闭BPE阵列系统不仅可以同时制备多个候选催化剂,而且可以同时评估它们,这对燃料电池领域具有重要的直接意义。
更新日期:2019-01-01
down
wechat
bug