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Olivaceous two-dimensional (2D) multi-layer graphene-like Co 3 O 4 thin sheets (CQU-Chen-Co-O-1) with vertically aligned nanosheet as basic building units were first prepared10 on a large scale by direct hydrothermal decomposition of the mixed aqueous solution of cobalt (II) nitrate and acetic acid without the assistance of any template or surfactant. The resulting products exhibited excellent pseudocapacitive performance with high specific capacitance of 1752 and 1862 15 F·g -1 at 5 mVs -1 and 1 A·g -1 , respectively, as well as good rate capability (63.64% capacitance surplus) and high cycling performance (99.5% surplus after 2000 cycles). 65 85Herein, a simple route for 2D multi-layer graphene-like Co 3 O 4 thin sheets (CQU-Chen-Co-O-1) with vertically

To understand the fundamental aspects of SnO2 catalytic materials and develop applicable catalysts for VOCs combustion, SnO2 samples possessing stable and varied surface areas are controllably constructed and applied to toluene deep oxidation. By improving SnO2 surface area, the Sn4+ cation exposure is improved, thus increasing its surface acidity, which benefits toluene molecule adsorption and activation. Furthermore, more surface defects can be generated, hence inducing the generation of more abundant surface active oxygen sites, which is favorable for further oxidizing the adsorbed and activated toluene intermediates. Therefore, the intrinsic activity of SnO2 is eventually promoted. The coexistence of both kinds of active sites is crucial for the reaction, and the concerted interaction between them controls the reaction performance. Catalysts with good activity, superior stability, and potent water vapor tolerance can be achieved by controllably constructing SnO2 possessing large and stable surface areas, and supporting less amount of Pd onto it.

Aqueous rechargeable batteries have attracted attention owning to their advantages of safety, low cost, and sustainability, while the limited electrochemical stability window (1.23 V) of water leads to their failure in competition with organic‐based lithium‐ion batteries. Herein, we report an alkali–acid Zn–PbO2 hybrid aqueous battery obtained by coupling an alkaline Zn anode with an acidic PbO2 cathode. It shows the capability to deliver an impressively high open‐circuit voltage (Voc) of 3.09 V and an operate voltage of 2.95 V at 5 mA cm−2, thanks to the contribution of expanding the voltage window and the electrochemical neutralization energy from the alkali–acid asymmetric‐electrolyte hybrid cell. The hybrid battery can potentially deliver a large area capacity over 2 mAh cm−2 or a high energy density of 252.39 Wh kg−1 and shows almost no fading in area capacity over 250 charge–discharge cycles.