Optimizing the electronic structure of CoNx via coupling with N-doped carbon for efficient electrochemical hydrogen evolution.
Optimizing the electronic structure of CoNx via coupling with N-doped carbon for efficient electrochemical hydrogen evolution.
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DOI：
10.1016/j.jcis.2022.08.081
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发表时间：
2022-08
影响因子：
9.9
通讯作者：
Peiyun Zhou;Rushuo Li;Junjun Lv;G. Zhao;Xiaowei Zhang;Xiubing Huang;Yunfeng Lu;Ge Wang
中科院分区：
文献类型：
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作者：
Peiyun Zhou;Rushuo Li;Junjun Lv;G. Zhao;Xiaowei Zhang;Xiubing Huang;Yunfeng Lu;Ge Wang
过渡金属氮化物(TMN)被认为是一类优良的析氢反应电催化剂，但仍有很大的改进空间。在这项工作中，氮化钴(CoNx)与N掺杂碳(N单键C)偶联，并以泡沫镍(NF)为载体，设计了一种高效的HER电催化剂(NF/CoNx@N单键C)。N单键C的引入不仅可以优化CoNx的电子结构，提高催化剂的本征活性，而且还可以提高催化剂的电子导电性和稳定性。结果表明，Nf/CoNx@NSingle BondC表现出优异的性能。一方面，它只需要69毫伏的过电位就可以提供20毫安/毫伏的电流密度，远远优于−的电流密度(182毫伏)。另一方面，引入N单键C后，催化剂的电子导电性和稳定性都得到了显著的提高。本工作成功地进行了以提高本征活性、电子电导率和稳定性为目标的材料设计，对新型过渡金属基电催化剂的设计具有一定的参考和指导意义。
Transition metal nitrides (TMNs) have been regarded as an excellent class of electrocatalysts for hydrogen evolution reaction (HER), but there is still huge room for improvement. In this work, cobalt nitride (CoNx) coupled with N-doped carbon (Nsingle bondC) and supported by nickel foam (NF) is designed as an efficient HER electrocatalyst (NF/CoNx@Nsingle bondC). The introduction of Nsingle bondC can not only optimize the electronic structure of CoNxto boost the intrinsic activity, but also enhance the electronic conductivity and stability of the catalyst. As a result, NF/CoNx@Nsingle bondC exhibits excellent HER performance. On the one hand, it only needs an overpotential of 69 mV to deliver a current density of 20 mA cm−2in 1.0 mol/L KOH, far better than that of CoNx(182 mV). On the other hand, the electronic conductivity and stability of the catalyst can be significantly enhanced after the introduction of Nsingle bondC. This work has done successful material design with the goal of enhancing the intrinsic activity, electronic conductivity, and stability, which has certain reference and guiding significance for the design of novel transition metal-based electrocatalysts.