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Synergistic co-doping induced high catalytic activities of La/Fe doped Co3O4 towards oxygen reduction/evolution reactions for Zn–air batteries
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-09-20 , DOI: 10.1039/d2ta06726a Zhongyuan Xia 1 , Binglu Deng 2 , Yongjie Wang 3 , Zhongqing Jiang 4 , Zhong-Jie Jiang 1
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-09-20 , DOI: 10.1039/d2ta06726a Zhongyuan Xia 1 , Binglu Deng 2 , Yongjie Wang 3 , Zhongqing Jiang 4 , Zhong-Jie Jiang 1
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La/Fe co-doped Co3O4 nanoparticles supported on aminated carbon nanotubes (LaFe–Co3O4/NCNTs) have been demonstrated to be active bifunctional catalysts for oxygen reduction/revolution reactions (ORR/OER). With optimal La/Fe doping levels, LaFe–Co3O4/NCNTs exhibits an overall ORR/OER bifunctional catalytic activity higher than most catalysts reported recently. The high performance of LaFe–Co3O4/NCNTs mainly originates from the specific La/Fe co-doped structure of the LaFe–Co3O4 NPs, which increases both the ORR and OER catalytic activities of the LaFe–Co3O4 NPs to higher degrees. DFT calculations have shown that the La/Fe co-doping can decrease the overpotentials of both the ORR and the OER and increase the stability of the LaFe–Co3O4 NPs. Additionally, carbon coating can further increase the catalytic activities of LaFe–Co3O4/NCNTs by the decrease of the polarization losses caused by the electrical resistance. When used in zinc–air batteries (ZABs), the carbon coated LaFe–Co3O4/NCNTs (C@LaFe–Co3O4/NCNTs) can exhibit a maximum power density of 122.2 mW cm−2, which is >20% higher than that of mixed catalysts of Pt/C + RuO2. This, along with the much higher cycling stability of C@LaFe–Co3O4/NCNTs, suggests great potential for its use as a bifunctional catalyst for practical applications.
中文翻译：
协同共掺杂诱导 La/Fe 掺杂 Co3O4 对 Zn-空气电池的氧还原/析出反应具有高催化活性
负载在胺化碳纳米管（LaFe-Co 3 O 4 /NCNTs）上的 La/Fe 共掺杂 Co 3 O 4纳米颗粒已被证明是用于氧还原/旋转反应（ORR/OER）的活性双功能催化剂。在最佳的 La/Fe 掺杂水平下，LaFe-Co 3 O 4 /NCNTs 的整体 ORR/OER 双功能催化活性高于最近报道的大多数催化剂。LaFe-Co 3 O 4 /NCNTs的高性能主要源于LaFe-Co 3 O 4 NPs的特定La/Fe共掺杂结构，这提高了LaFe-Co 3 O的ORR和OER催化活性4个NPs到更高的程度。DFT计算表明，La/Fe共掺杂可以降低ORR和OER的过电位，提高LaFe-Co 3 O 4 NPs的稳定性。此外，碳涂层可以通过减少由电阻引起的极化损失，进一步提高 LaFe-Co 3 O 4 /NCNTs 的催化活性。当用于锌空气电池 (ZABs) 时，碳包覆的 LaFe–Co 3 O 4 /NCNTs (C@LaFe–Co 3 O 4 /NCNTs) 可以表现出 122.2 mW cm -2的最大功率密度，即 >比Pt/C + RuO 2混合催化剂高20%. 这与 C@LaFe–Co 3 O 4 /NCNTs更高的循环稳定性一起，表明其在实际应用中作为双功能催化剂的巨大潜力。
更新日期：2022-09-20
中文翻译：
协同共掺杂诱导 La/Fe 掺杂 Co3O4 对 Zn-空气电池的氧还原/析出反应具有高催化活性
负载在胺化碳纳米管（LaFe-Co 3 O 4 /NCNTs）上的 La/Fe 共掺杂 Co 3 O 4纳米颗粒已被证明是用于氧还原/旋转反应（ORR/OER）的活性双功能催化剂。在最佳的 La/Fe 掺杂水平下，LaFe-Co 3 O 4 /NCNTs 的整体 ORR/OER 双功能催化活性高于最近报道的大多数催化剂。LaFe-Co 3 O 4 /NCNTs的高性能主要源于LaFe-Co 3 O 4 NPs的特定La/Fe共掺杂结构，这提高了LaFe-Co 3 O的ORR和OER催化活性4个NPs到更高的程度。DFT计算表明，La/Fe共掺杂可以降低ORR和OER的过电位，提高LaFe-Co 3 O 4 NPs的稳定性。此外，碳涂层可以通过减少由电阻引起的极化损失，进一步提高 LaFe-Co 3 O 4 /NCNTs 的催化活性。当用于锌空气电池 (ZABs) 时，碳包覆的 LaFe–Co 3 O 4 /NCNTs (C@LaFe–Co 3 O 4 /NCNTs) 可以表现出 122.2 mW cm -2的最大功率密度，即 >比Pt/C + RuO 2混合催化剂高20%. 这与 C@LaFe–Co 3 O 4 /NCNTs更高的循环稳定性一起，表明其在实际应用中作为双功能催化剂的巨大潜力。
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