Banjong Boonchom

Bio: Banjong Boonchom is an academic researcher from King Mongkut's Institute of Technology Ladkrabang. The author has contributed to research in topics: Thermal decomposition & Dehydration reaction. The author has an hindex of 17, co-authored 62 publications receiving 930 citations. Previous affiliations of Banjong Boonchom include Khon Kaen University.

Thermodynamics and kinetics of the dehydration reaction of FePO4·2H2O

Abstract: The thermal decomposition kinetics of FePO4·2H2O in dynamical air atmosphere was studied by mean TG–DTG–DTA. The stage and product of the thermal decomposition were determined. A number of kinetic models and calculation procedures were used to determine the kinetic triplet and thermodynamic parameters characterizing the dehydration process. The obtained activation energy and most kinetic model indicate the single kinetic mechanism and three-dimension diffusion as “Ginstling–Brounstein equation (D4 model)”, respectively. The thermodynamic functions (ΔH*, ΔG* and ΔS*) of the dehydration reaction are calculated by the activated complex theory and indicate that the process is non-spontaneous without connecting with the introduction of heat. The kinetic and thermodynamic results were satisfactory which present good correlation with a linear correlation coefficient close to unit a low standard deviation.

Kinetics and Thermodynamic Properties of the Thermal Decomposition of Manganese Dihydrogenphosphate Dihydrate

Abstract: The thermal decomposition of manganese dihydrogenphosphate dihydrate Mn(H2PO4)2·2H2O was investigated in air using differential thermal analysis-thermogravimetry. Mn(H2PO4)2·2H2O decomposes in two steps and the final decomposition product (Mn2P4O12) was studied by X-ray powder diffraction and FT-IR spectroscopy. The activation energies of the dehydration and decomposition steps of Mn(H2PO4)2·2H2O were calculated through the isoconversional methods of Ozawa and Kissinger−Akahira−Sunose and the possible conversion functions have been estimated through the Coats−Redfern method. The activation energy calculated for the dehydration and decomposition of Mn(H2PO4)2·2H2O by different methods and techniques were found to be consistent. The possible conversion functions of the dehydration and decomposition reactions for Mn(H2PO4)2·2H2O were “cylindrical symmetry” and “three-dimension diffusion”, respectively. Activated complex theory has been applied to each step of the reaction and the thermodynamic functions ΔH∗,...

Kinetic and thermodynamic studies of MgHPO4 · 3H2O by non-isothermal decomposition data

Abstract: The thermal decomposition of magnesium hydrogen phosphate trihydrate MgHPO4 · 3H2O was investigated in air atmosphere using TG-DTG-DTA. MgHPO4 · 3H2O decomposes in a single step and its final decomposition product (Mg2P2O7) was obtained. The activation energies of the decomposition step of MgHPO4 · 3H2O were calculated through the isoconversional methods of the Ozawa, Kissinger–Akahira–Sunose (KAS) and Iterative equation, and the possible conversion function has been estimated through the Coats and Redfern integral equation. The activation energies calculated for the decomposition reaction by different techniques and methods were found to be consistent. The better kinetic model of the decomposition reaction for MgHPO4 · 3H2O is the F 1/3 model as a simple n-order reaction of “chemical process or mechanism no-invoking equation”. The thermodynamic functions (ΔH*, ΔG* and ΔS*) of the decomposition reaction are calculated by the activated complex theory and indicate that the process is non-spontaneous without connecting with the introduction of heat.

Non-isothermal kinetics of the thermal decomposition of sodium oxalate Na2C2O4

Abstract: The thermal transformation of Na2C2O4 was studied in N2 atmosphere using thermo gravimetric (TG) analysis and differential thermal analysis (DTA). Na2C2O4 and its decomposed product were characterized using a scanning electron microscope (SEM) and the X-ray diffraction technique (XRD). The non-isothermal kinetic of the decomposition was studied by the mean of Ozawa and Kissinger–Akahira–Sunose (KAS) methods. The activation energies (Eα) of Na2C2O4 decomposition were found to be consistent. Decreasing Eα at increased decomposition temperature indicated the multi-step nature of the process. The possible conversion function estimated through the Liqing–Donghua method was ‘cylindrical symmetry (R2 or F1/2)’ of the phase boundary mechanism. Thermodynamic functions (ΔH*, ΔG* and ΔS*), calculated by the Activated complex theory and kinetic parameters, indicated that the decomposition step is a high energy pathway and revealed a very hard mechanism.

Antiferroelectrics for Energy Storage Applications: a Review

Abstract: Z.L., T.L., R.W., and Y.L. thank the Australian Research Council (ARCDP160104780) for financial support in the form of ARC Discovery Project. Z.L., J.Y., G.W., and X.D. thank the financial support of the National Natural Science Foundation of China (NSFC No. 11774366) and International Partnership Project of Chinese Academy of Science. Z.L. also acknowledges the support of Shanghai Sailing Program (No. 17YF1429700).

Enhancing Water Oxidation Catalysis on a Synergistic Phosphorylated NiFe Hydroxide by Adjusting Catalyst Wettability

Abstract: Surface wettability is very important for designing and developing heterogeneous electrocatalysts that can be applied in an aqueous environment. Here, by adjusting the surface wettability of the catalyst using a facile two-step strategy, a porous nanosheet electrocatalyst composed of NiFe hydroxide and NiFe phosphate (denoted as NiFe/NiFe:Pi), has been designed and developed. The two-step strategy not only allows us to successfully control the morphology but also provides an approach to modify the surface chemical property of a catalyst. After phosphorylation, the surface wettability of the NiFe/NiFe:Pi catalyst is significantly enhanced (contact angle 44 ± 3°) in comparison to that of NiFe hydroxide electrode without phosphorylation (contact angle 129 ± 5°). Serving as an oxygen evolution catalyst in 1 M KOH aqueous solution, the NiFe/NiFe:Pi electrode yields strong synergistic oxygen evolution activity to deliver a current density of 10 mA cm–2 with an overpotential merely of 290 mV. The catalyst also e...

Mesoporous Amorphous FePO4 Nanospheres as High-Performance Cathode Material for Sodium-Ion Batteries

Abstract: FePO4 nanospheres are synthesized successfully through a simple chemically induced precipitation method. The nanospheres present a mesoporous amorphous structure. Electrochemical experiments show that the FePO4/C electrode demonstrates a high initial discharging capacity of 151 mAh g–1 at 20 mA g–1, stable cyclablilty (94% capacity retention ratio over 160 cycles), as well as high rate capability (44 mAh g–1 at 1000 mA g–1) for Na-ion storage. The superior electrochemical performance of the FePO4/C nanocomposite is due to its particular mesoporous amorphous structure and close contact with the carbon framework, which significantly improve the ionic and electronic transport and intercalation kinetics of Na ions.