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Promotion of Overall Water Splitting Activity Over a Wide pH Range by Interfacial Electrical Effects of Metallic NiCo‐nitrides Nanoparticle/NiCo2O4 Nanoflake/graphite Fibers
Advanced Science ( IF 14.3 ) Pub Date : 2019-01-15 , DOI: 10.1002/advs.201801829 Zhihe Liu 1, 2 , Hua Tan 2 , Daobin Liu 3 , Xiaobiao Liu 4 , Jianping Xin 2 , Junfeng Xie 5 , Mingwen Zhao 4 , Li Song 3 , Liming Dai 6 , Hong Liu 1, 2
Advanced Science ( IF 14.3 ) Pub Date : 2019-01-15 , DOI: 10.1002/advs.201801829 Zhihe Liu 1, 2 , Hua Tan 2 , Daobin Liu 3 , Xiaobiao Liu 4 , Jianping Xin 2 , Junfeng Xie 5 , Mingwen Zhao 4 , Li Song 3 , Liming Dai 6 , Hong Liu 1, 2
Affiliation
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Many efforts have been made to develop bifunctional electrocatalysts to facilitate overall water splitting. Here, a fibrous bifunctional 3D electrocatalyst is reported for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) with high performance. The remarkable electrochemical performance is attributed of the catalysts to a number of factors: the metallic character of the three components (i.e., Ni3N, CoN, and NiCo2O4); the electronic structure, nanoflake‐nanosphere network with abundant electroactive sites, and the electric field effect at the interfaces between different components. The oxide–nitride/graphite fibers have the lowest overpotential requirements of 71 and 183 mV at 10 mA cm−2 for HER and OER in alkaline medium, respectively. These values are comparable to those of commercial Pt/C (20 wt%) and RuO2. The electrodes also show a response to HER and OER in both neutral and acid media. Furthermore, the 3D structure can be highlighted by all‐round electrodes for overall water splitting. The calculations on the changes in electrons transfer and the Femi level from oxides to oxides/nitrides reveal that the observed superb electrocatalytic performance can be attributed to the presence of Ni3N and CoN derived from the in situ nitridation of NiCo2O4.
中文翻译：
金属 NiCo 氮化物纳米粒子/NiCo2O4 纳米片/石墨纤维的界面电效应在宽 pH 范围内促进整体水分解活性
人们已经做出了许多努力来开发双功能电催化剂以促进整体水分解。在此，报道了一种纤维状双功能 3D 电催化剂，可用于高性能的析氢反应 (HER) 和析氧反应 (OER)。该催化剂卓越的电化学性能归因于多种因素：三种组分（即Ni 3 N、CoN和NiCo 2 O 4 ）的金属特性；电子结构、具有丰富电活性位点的纳米片-纳米球网络以及不同组件之间界面的电场效应。氧化物-氮化物/石墨纤维在碱性介质中对于HER和OER具有最低的过电势要求，在10 mA cm -2下分别为71和183 mV。这些值与商业 Pt/C (20 wt%) 和 RuO 2的值相当。该电极还在中性和酸性介质中表现出对 HER 和 OER 的响应。此外，3D结构可以通过用于整体水分解的全方位电极来突出。对电子转移和从氧化物到氧化物/氮化物的Femi能级变化的计算表明，观察到的优异电催化性能可归因于NiCo 2 O 4原位氮化产生的Ni 3 N和CoN的存在。
更新日期：2019-01-15
中文翻译：
金属 NiCo 氮化物纳米粒子/NiCo2O4 纳米片/石墨纤维的界面电效应在宽 pH 范围内促进整体水分解活性
人们已经做出了许多努力来开发双功能电催化剂以促进整体水分解。在此，报道了一种纤维状双功能 3D 电催化剂，可用于高性能的析氢反应 (HER) 和析氧反应 (OER)。该催化剂卓越的电化学性能归因于多种因素：三种组分（即Ni 3 N、CoN和NiCo 2 O 4 ）的金属特性；电子结构、具有丰富电活性位点的纳米片-纳米球网络以及不同组件之间界面的电场效应。氧化物-氮化物/石墨纤维在碱性介质中对于HER和OER具有最低的过电势要求，在10 mA cm -2下分别为71和183 mV。这些值与商业 Pt/C (20 wt%) 和 RuO 2的值相当。该电极还在中性和酸性介质中表现出对 HER 和 OER 的响应。此外，3D结构可以通过用于整体水分解的全方位电极来突出。对电子转移和从氧化物到氧化物/氮化物的Femi能级变化的计算表明，观察到的优异电催化性能可归因于NiCo 2 O 4原位氮化产生的Ni 3 N和CoN的存在。
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