Blocky woodceramic electrode materials are prepared by Ni(NO 3 ) 2 catalysis and K 2 CO 3 activation with waste poplar wood which is self-assembled with pulping black liquor lignin. The results show that the natural hierarchical pore structure of wood can be well preserved, and the activation, catalytic graphitisation, and Ni 2+ doping are accomplished simultaneously in the sintering process. Meanwhile, some of the lignin which self-assembled onto the pore surface of wood and on the crystal surface of activator and catalyst is transformed into carbon nanosheet and multilayer graphene, and some present an orderly arrangement according to the original form of the crystal. Ni 2+ doping not only builds the basic form of electrode but also reduces the stacks of carbon nanosheet and multilayer graphene. Meanwhile, activation can improve the pore structure, providing more channels for the storage and transmission of electrons and ions. At the current density of 0.25 A g −1 , the specific capacitance of the sample can reach 150.8 F g −1 .

中文翻译：

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镍催化木质素组装木陶瓷制备块状电极

块状木陶瓷电极材料采用Ni(NO 3 ) 2 催化和K 2 CO 3 活化，用废杨木与制浆黑液木质素自组装而成。结果表明，木材的天然分级孔隙结构可以得到很好的保留，活化、催化石墨化和Ni 2+ 掺杂在烧结过程中同时完成。同时，一些木质素自组装到木材的孔隙表面和活化剂和催化剂的晶体表面上，转化为碳纳米片和多层石墨烯，有些则根据晶体的原始形态有序排列。Ni 2+ 掺杂不仅构建了电极的基本形式，而且还减少了碳纳米片和多层石墨烯的堆叠。同时，活化可以改善孔隙结构，为电子和离子的储存和传输提供更多的通道。在0.25 A g -1 的电流密度下，样品的比电容可以达到150.8 F g -1 。