Zhifeng Wang's research while affiliated with Hebei University of Technology and other places

... While technologies like ion exchange, reverse osmosis, and electrodialysis, have been developed for NO 3 − remediation and clean water production [18,19], they often result in wastewater with high NO 3 − levels, requiring further treatment. Given the lower dissociation energy of the N-O bond in NO 3 − (204 kJ mol −1 ) and the ease of recovering NH 3 from its aqueous solution, using NO 3 − pollution as a nitrogen source for the electrochemical synthesis of NH 3 is highly appealing [20][21][22][23][24][25][26][27][28]. However, the intricate eight-electron reduction process and the competing HER limit the efficiency and selectivity of NH 3 production in the electrocatalytic NO 3 − reduction reaction (NO 3 − RR) [29][30][31]. ...

... On the one hand, urea can be used as a nitrogenous fertilizer to soil and a feed stock to synthesize high-valueadded chemicals [1][2][3][4][5]. On the other hand, the waste urea discharged into the environments results in water eutrophication and air pollution [1,[6][7][8][9][10]. It is urgent to find a solution to weaken and even prevent the detrimental effects from the urea applications. ...

... During the dealloying process, the active metallic elements in alloy precursor are selectively removed by chemical or electrochemical methods based on the different chemical activities [57]. Simultaneously, the remaining metallic elements form a unique nano-scale porous structure through migration and diffusion process [58,59]. By changing the element composition and subsequent treatment, the morphology, structure and space arrangement can be controlled [60]. ...

... As cardiovascular and orthopedic implants require high hardness and strength, the development of Zn mechanical characteristics is one of the most important approaches by which to expand its application in medical implants [49][50][51][52]. Alloying elements are used as a good tool to significantly improve the performance of Zn [53][54][55][56][57]. A number of the mechanical characteristics of Zn-based alloys are compared in Table 2. ...

... Due to their high strength and plastic properties, magnesium-zinc alloys are used in many areas [1,2]. Additionally, due to their biocompatibility with the human body, they seem to be an ideal candidate for biomedical materials [1][2][3]. ...

... The half-cell exhibits nearly stable discharge capacity in the examined cycles at each C-rate tested. This stable discharge capacity at such a high C-rate shows the prepared SiO 2 @Fe 2 O 3 nanocomposite anode is favourable for Li + storage and release [27,[36][37][38]. When the half-cell is tested again at 0.2C-rate after subjecting the half-cell to different C-rates, the SiO 2 @Fe 2 O 3 electrode retains almost its original discharge capacity of 400 mAh g −1 . ...

... Wence Xu et al. [59] reported the two-step synthesis of nano porous PdH 0.43 . Fangjie Pang and coworkers successfully obtained PdAg alloys with controllable Pd/Ag atomic ratios and hierarchical porous structures via two-step dealloying of the Pd 1 Ag 2 Al 97 precursor alloy [143]. The disadvantage of dealloying process is the inability to control the porosity beyond the surface of the nanomaterial owing to the lack of precise control of the pore size. ...

... First, the poor electronic conductivity of element sulfur limits the specific capacity value [7,8]. Second, the discharge products of polysulfide could migrate from the cathode to the anode, called "shuttle effect," leading to the rapid capacity fading [9][10][11][12]. Finally, the big volume change of sulfur during the cycling causes the destruction of the cathode structure [13,14]. ...

... Compared with the integration of a solar cell and supercapacitor, the coupling of a photoelectrode and supercapacitor can efficiently convert and store the solar energy as electric or chemical energy with a simpler device configuration. Different structures of integrated photocapacitive electrodes such as Cu/Cu 2 O, TiO 2 /Ni(OH) 2 , Fe 2 O 3 /Ni(OH) 2 and BiVO 4 -PbO x have been investigated [9][10][11][12]. Currently, the photo-rechargeable performance of photocapacitive electrodes is still far from being commercialized. ...

... Moreover, it was known that the redox potential of K + /K (−2.93 V vs. standard hydrogen electrode [SHE]) is similar to that of Li + /Li (−3.04 V vs. SHE), which implies that KIBs can have the merits of not only low production cost but also high energy density. [10][11][12][13] Thus, many research have focused on the development of novel and outstanding electrode materials for KIBs, and various cathode materials for KIBs have been reported, such as polyanion compounds, Prussian blue analogs, and layered-type oxides. [14][15][16][17][18][19][20][21][22][23] In particular, layered-type transition metal (TM) oxide materials "K x [TM]O 2 " have great attention because of their large gravimetric capacities. ...