Hydrothermal synthesis and annealing process were used to create a honeycomb-structured composite electrode material on nickel foam substrate that contained praseodymium oxide (Pr2O3), cobalt oxide (Co3O4), and reduced graphene oxide (rGO) (named as Pr2O3/Co3O4/rGO/NF). The Pr2O3/Co3O4/rGO/NF (PCGN) composite electrode material was created without the need for a binder and can be employed right away to create a supercapacitor. This honeycomb composite is further grown by the mesh structure of Pr2O3 and Co3O4, which has good electrical conductivity. This nanomorphology not only improves the specific surface area of the material but also facilitates the improvement of electron transfer efficiency. The synthesized electrode material has excellent electrochemical properties due to its special morphology and excellent conductivity, and its performance is better than that of praseodymium oxide and cobalt oxide alone, with a specific capacitance of 3316 F g−1 in the three-electrode system at a current density of 1 A g−1. After forming a symmetrical supercapacitor device, the energy density is 74.8 W h kg−1 and the power density is 300 W kg−1 at 0.5 A g−1. The capacitance retention is 82% even after 35 000 cycles at 2 A g−1.
Jinfu Ma,Jing Li,Shaolin Yang,Hui Lu,Limeng Liu,Ruipeng Wang
In direct borohydride fuel cell (DBFC), there is a contradiction between catalytic activity and specific discharge capacity (SDC) owing to the dual catalytic effects of most anode catalysts on both borohydride oxidation reaction (BOR) and borohydride hydrolysis reaction (BHR). To overcome this problem, a facile method to fabricate an ultrathin tin dioxide (SnO 2 ) supported cobalt oxide (Co 3 O 4 ) composite material (u-SnO 2 /Co 3 O 4 ) as DBFC anode catalyst was developed. Both catalytic ability for BOR and specific discharge capacity of the DBFC using the u-SnO 2 /Co 3 O 4 (DBFC-u-SnO 2 /Co 3 O 4 ) with 5–10 nm thick two-dimensional (2D) SnO 2 were improved. The maximum power density (52.5 mW cm −2 ) and SDC (1380 mAh g −1 ) of DBFC-u-SnO 2 /Co 3 O 4 were respectively increased by 105% and 1740% in comparison with those of DBFC with Co 3 O 4 as anode catalyst (DBFC-Co 3 O 4 ). The u-SnO 2 /Co 3 O 4 has higher specific surface area, electron donation ability, and the rate of desorption of intermediate product (such as BH 3 OH − , H ads ) which may account for the excellent catalytic performance of u-SnO 2 /Co 3 O 4 for BOR.
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