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Anchoring CoFe2O4 Nanoparticles on N‐Doped Carbon Nanofibers for High‐Performance Oxygen Evolution Reaction
Advanced Science ( IF 14.3 ) Pub Date : 2017-08-07 , DOI: 10.1002/advs.201700226 Tongfei Li 1 , Yinjie Lv 1 , Jiahui Su 1 , Yi Wang 1 , Qian Yang 1 , Yiwei Zhang 2 , Jiancheng Zhou 3 , Lin Xu 1 , Dongmei Sun 1 , Yawen Tang 1
Advanced Science ( IF 14.3 ) Pub Date : 2017-08-07 , DOI: 10.1002/advs.201700226 Tongfei Li 1 , Yinjie Lv 1 , Jiahui Su 1 , Yi Wang 1 , Qian Yang 1 , Yiwei Zhang 2 , Jiancheng Zhou 3 , Lin Xu 1 , Dongmei Sun 1 , Yawen Tang 1
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The exploration of earth‐abundant and high‐efficiency electrocatalysts for the oxygen evolution reaction (OER) is of great significant for sustainable energy conversion and storage applications. Although spinel‐type binary transition metal oxides (AB2O4, A, B = metal) represent a class of promising candidates for water oxidation catalysis, their intrinsically inferior electrical conductivity exert remarkably negative impacts on their electrochemical performances. Herein, we demonstrates a feasible electrospinning approach to concurrently synthesize CoFe2O4 nanoparticles homogeneously embedded in 1D N‐doped carbon nanofibers (denoted as CoFe2O4@N‐CNFs). By integrating the catalytically active CoFe2O4 nanoparticles with the N‐doped carbon nanofibers, the as‐synthesized CoFe2O4@N‐CNF nanohybrid manifests superior OER performance with a low overpotential, a large current density, a small Tafel slope, and long‐term durability in alkaline solution, outperforming the single component counterparts (pure CoFe2O4 and N‐doped carbon nanofibers) and the commercial RuO2 catalyst. Impressively, the overpotential of CoFe2O4@N‐CNFs at the current density of 30.0 mA cm−2 negatively shifts 186 mV as compared with the commercial RuO2 catalyst and the current density of the CoFe2O4@N‐CNFs at 1.8 V is almost 3.4 times of that on RuO2 benchmark. The present work would open a new avenue for the exploration of cost‐effective and efficient OER electrocatalysts to substitute noble metals for various renewable energy conversion/storage applications.
中文翻译：
将 CoFe2O4 纳米粒子锚定在氮掺杂碳纳米纤维上用于高性能析氧反应
探索地球丰富且高效的析氧反应（OER）电催化剂对于可持续能源转换和存储应用具有重要意义。尽管尖晶石型二元过渡金属氧化物（AB 2 O 4，A，B = 金属）代表了一类有前景的水氧化催化候选材料，但其本质上较差的电导率对其电化学性能产生了显着的负面影响。在此，我们展示了一种可行的静电纺丝方法，可以同时合成均匀嵌入一维氮掺杂碳纳米纤维中的CoFe 2 O 4纳米颗粒（表示为CoFe 2 O 4 @N-CNFs）。通过将催化活性CoFe 2 O 4纳米颗粒与N掺杂碳纳米纤维相结合，合成的CoFe 2 O 4 @N-CNF纳米杂化物表现出优异的OER性能，具有低过电势、大电流密度、小塔菲尔斜率、和在碱性溶液中的长期耐久性，优于单组分对应物（纯CoFe 2 O 4和氮掺杂碳纳米纤维）和商业RuO 2催化剂。令人印象深刻的是，与商用RuO 2催化剂和CoFe 2 O 4 @N-CNFs在30.0 mA cm -2电流密度下的过电势相比，CoFe 2 O 4 @N-CNFs在30.0 mA cm -2 下的过电势负移了186 mV。 1.8 V 几乎是 RuO 2基准电压的 3.4 倍。目前的工作将为探索具有成本效益和高效的OER电催化剂开辟一条新途径，以替代贵金属用于各种可再生能源转换/存储应用。
更新日期：2017-08-07
中文翻译：
将 CoFe2O4 纳米粒子锚定在氮掺杂碳纳米纤维上用于高性能析氧反应
探索地球丰富且高效的析氧反应（OER）电催化剂对于可持续能源转换和存储应用具有重要意义。尽管尖晶石型二元过渡金属氧化物（AB 2 O 4，A，B = 金属）代表了一类有前景的水氧化催化候选材料，但其本质上较差的电导率对其电化学性能产生了显着的负面影响。在此，我们展示了一种可行的静电纺丝方法，可以同时合成均匀嵌入一维氮掺杂碳纳米纤维中的CoFe 2 O 4纳米颗粒（表示为CoFe 2 O 4 @N-CNFs）。通过将催化活性CoFe 2 O 4纳米颗粒与N掺杂碳纳米纤维相结合，合成的CoFe 2 O 4 @N-CNF纳米杂化物表现出优异的OER性能，具有低过电势、大电流密度、小塔菲尔斜率、和在碱性溶液中的长期耐久性，优于单组分对应物（纯CoFe 2 O 4和氮掺杂碳纳米纤维）和商业RuO 2催化剂。令人印象深刻的是，与商用RuO 2催化剂和CoFe 2 O 4 @N-CNFs在30.0 mA cm -2电流密度下的过电势相比，CoFe 2 O 4 @N-CNFs在30.0 mA cm -2 下的过电势负移了186 mV。 1.8 V 几乎是 RuO 2基准电压的 3.4 倍。目前的工作将为探索具有成本效益和高效的OER电催化剂开辟一条新途径，以替代贵金属用于各种可再生能源转换/存储应用。
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