Preparation of a High Performance Electrocatalyst for Oxygen Reduction Reaction by Suppressing the Agglomeration of the Carbon Material with RbCl,ChemCatChem

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Preparation of a High Performance Electrocatalyst for Oxygen Reduction Reaction by Suppressing the Agglomeration of the Carbon Material with RbCl
ChemCatChem ( IF 3.8 ) Pub Date : 2018-10-31 , DOI: 10.1002/cctc.201801406
Bing Yuan ₁ , Ping Li ₁ , Mochong Tian ₂ , Qing Qin ₁ , Xien Liu ₁

Affiliation

Replacing platinum (Pt) electrocatalysts with metal‐free or non‐precious metal electrocatalysts for the oxygen reduction reaction (ORR) remains an enormous challenge. Herein, a new highly active spheroidal nanocarbon ORR electrocatalyst is synthesized by annealing a rubidium‐phytic acid gel. The catalyst is composed of N, P‐doped spheroidal nanocarbon modified by PO₄⁻ groups on the surface and with an ultralow content of Rb (0.005 wt%) (PON/C‐“Rb”). The agglomeration caused by annealing in the presence of phytic acid alone is completely suppressed by the addition of RbCl. Because more edges, defects and PO₄⁻ groups are present on the PON/C‐“Rb”, the as‐prepared PON/C‐“Rb” electrocatalyst exhibits an outstanding ORR activity with a half‐wave potential that is 40 mV more positive than that of the commercial Pt/C catalyst and a similar onset potential of 1.00 V in a 0.1 M KOH solution. More importantly, the primary zinc‐air battery with PON/C‐“Rb” as a cathode catalyst shows a specific capacity and an energy density of 705 mAh g_Zn⁻¹ and 860 Wh Kg_Zn⁻¹, respectively, which are comparable to most of the best reported metal‐free and non‐precious metal catalysts.

中文翻译：

抑制碳材料与RbCl的团聚来制备用于氧还原反应的高性能电催化剂

用无金属或非贵金属的电催化剂代替铂（Pt）电催化剂进行氧还原反应（ORR）仍然是一个巨大的挑战。在此，通过annealing-植酸凝胶的退火合成了一种新型的高活性球状纳米碳ORR电催化剂。该催化剂是由N，P掺杂球状纳米碳由PO改性₄^-的表面上，并用RB（0.005重量％）（PON / C-“RB”）的超低内容组。通过添加RbCl可以完全抑制仅在植酸存在下退火引起的团聚。因为更多的边，缺陷和PO ₄^-PON / C-“ Rb”上存在两个基团，所制备的PON / C-“ Rb”电催化剂表现出出色的ORR活性，其半波电势比商用Pt / C的正电性高40 mV催化剂和在0.1 M KOH溶液中的1.00 V的类似起始电位。更重要的是，以PON / C-“ Rb”作为阴极催化剂的一次锌空气电池的比容量和能量密度分别为705 mAh g _Zn^-1和860 Wh Kg _Zn^-1，与报道最多的无金属和非贵金属催化剂。

更新日期：2018-10-31

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