Hetero-structural mass transfer channel boosts electrocatalytic oxygen reactions of metallic catalyst
Hetero-structural mass transfer channel boosts electrocatalytic oxygen reactions of metallic catalyst
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DOI：
10.1016/j.cej.2021.131140
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发表时间：
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影响因子：
15.1
通讯作者：
Jing Li;Junli Wu;Ziyi Xie;Xin-lei Zhang;Songlei Lv;H. Shao;Konggang Qu;Weiwei Cai
中科院分区：
文献类型：
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作者：
Jing Li;Junli Wu;Ziyi Xie;Xin-lei Zhang;Songlei Lv;H. Shao;Konggang Qu;Weiwei Cai
由于缺乏高效、经济的双功能氧催化剂，阻碍了锌空气电池(ZABS)的大规模应用。在这项工作中，合理地设计了碳包覆CoFe催化剂的多孔结构，该催化剂对析氧反应(OER)和析氧反应(ORR)都具有很高的活性。通过选择刻蚀和还原氧化石墨烯载体分别构筑孔径为10~100 nm和100~1000 nm的孔，可以方便地合成具有“板式反应器”结构的hs-CoFe催化剂，以实现平滑的传质。OER/ORR活性显著提高，提供10 mA/cm2OER的电势与ORR的半波电势之差降至0.608 nV，而Pt/C-IrO2的这一电势差为0.732 nV。相应的ZAB显示出最大功率密度为232nW/cm2，这为氧反应催化剂的设计提供了一种新的策略。
Large-scale application of zinc air batteries (ZABs) is impeded by the lack of efficient and cost-effective bifunctional oxygen catalysts. In this work, hetero-porous is rationally engineered for the carbon encapsulated CoFe catalyst, which is highly active toward both oxygen evolution reaction (OER) and oxygen evolution reaction (ORR). The hs-CoFe catalyst with “plate reactor” structure is facilely synthesized by combining the selective etching and reduced graphene oxide supporting to construct pores with size of 10–100 nm and 100–1000 nm, respectively, for smooth mass transfer. OER/ORR activities are significantly boosted, and difference between the potential to deliver 10 mA/cm2OER and half wave potential of ORR is therefore lowered to 0.608 V while this potential difference of Pt/C-IrO2is 0.732 V. The corresponding ZAB exhibits a maximum power density of 232 mW/cm2, which sheds light on providing a novel strategy for oxygen reaction catalyst designation.