Atomic orbitals modulated dual functional bimetallic phosphides derived from MOF on MOF structure for boosting high efficient overall water splitting

The electronic modulation characteristics of efficient metal phosphide electrocatalysts can be utilized to tune the performance of oxygen evolution reaction(OER).However,improving the overall water splitting performance remains a challenging task.By building metal organic framework(MOF)on MOF heterostructures,an efficient strategy for controlling the electrical structure of MOFs was presented in this study.ZIF-67 was in-situ synthesized on MIL-88(Fe)using a two-step self-assembly method,followed by low-temperature phosphorization to ultimately synthesize FeP-CoP_(3)bimetallic phosphides.By combining atomic orbital theory and theoretical calculations(density functional theory),the results reveal the successful modulation of electronic orbitals in FeP-CoP_(3)bimetallic phosphides,which are synthesized from MOF on MOF structure.The synergistic impact of the metal center Co species and the phase conjugation of both kinds of MOFs are responsible for this regulatory phenomenon.Therefore,the catalyst demonstrates excellent properties,demonstrating HER 81 mV(η10)in a 1.0 mol L^(−1)KOH solution and OER 239 mV(η50)low overpotentials.The FeP-CoP_(3)linked dual electrode alkaline batteries,which are bifunctional electrocatalysts,have a good electrocatalytic ability and may last for 50 h.They require just 1.49 V(η50)for total water breakdown.Through this technique,the electrical structure of electrocatalysts may be altered to increase catalytic activity.

A 20.8-Gbps Dual-Carrier Wireless Communication Link in 220-GHz Band

With the successful demonstration of terahertz(THz)high-speed wireless data transmission,the THz frequencies are now becoming a worth candidate for post-5G wireless communications.On the other hand,to bring THz communications a step closer to real scenario application,solving high data rate realtime transmission is also an important issue.This paper describes a 220-GHz solid-state dual-carrier wireless link whose maximum transmission real-time data rates are 20.8 Gbps(10.4 Gbps per channel).By aggregating two carrier signals in the THz band,the contradiction between high real-time data rate communication and low sampling rate analog-to-digital(ADC)and digital-to-analog converter(DAC)is alleviated.The transmitting and receiving front-ends consist of 220-GHz diplexers,220-GHz sub-harmonic mixers based on anti-parallel Schottky barrier diodes,G-band low-noise amplifiers(LNA),WR-4.3 band high-gain Cassegrain antennas,high data rates dual-DAC and-ADC baseband platform and other components.The low-density parity-check(LDPC)encoding is also realized to improve the bit error rate(BER)of the received signal.Modulated signals are centered at 214.4 GHz and 220.6 GHz with-11.9 dBm and-13.4 dBm output power for channel 1 and 2,respectively.This link is demonstrated to achieve 20.8-Gbps real-time data transmission using 16-QAM modulation over a distance of 1030 m.The measured signal to noise ratio(SNR)is 17.3 dB and 16.5 dB,the corresponding BER is 8.6e-7 and 3.8e-7,respectively.Furthermore,4K video transmission is also carried out which is clear and free of stutter.The successful transmission of aggregated channels in this wireless link shows the great potential of THz communication for future wireless high-rate real-time data transmission applications.

Three-dimensional reconstruction of systematic histological sections:application to observations on palatal shelf elevation

Normal mammalian secondary palate development undergoes a series of processes,including palatal shelf(PS)growth,elevation,adhesion and fusion,and palatal bone formation.It has been estimated that more than 90%of isolated cleft palate is caused by defects associated with the elevation process.However,because of the rapidly completed elevation process,the entire process of elevation will never be easy to clarify.In this article,we present a novel method for three-dimensional(3D)reconstruction of thick tissue blocks from two-dimensional(2D)histological sections.We established multiplanar sections of the palate and tongue in coronal and sagittal directions,and further performed 3D reconstruction to observe the morphological interaction and connection between the two components prior to and during elevation.The method completes an imaging system for simultaneous morphological analysis of thick tissue samples using both synthetic and real data.The new method will provide a comprehensive picture of reorientation morphology and gene expression pattern during the palatal elevation process.

W-doped FeNi_(2)S_(4)/Ni_(3)S_(2)/NF with interfacial effect as efficient bifunctional electrocatalyst for overall water splitting

Given the current shortage of resources and environmental pollution,rationally designing and developing low-cost and highefficiency bifunctional electrocatalysts is an urgent and challenging task.It is widely recognized that element doping can effectively improve the electrocatalytic activity by adjusting the microstructure,morphology,and electronic structure.Therefore,this work rationally designs and prepares three-dimensional flower-like structured W-doped FeNi_(2)S_(4)/Ni_(3)S_(2)/NF heterojunctions as efficient bifunctional electrocatalysts for overall water splitting.In 1 M KOH,the prepared W-FeNi_(2)S_(4)/Ni_(3)S_(2)/NF electrocatalyst can effectively drive both hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)processes,and only needs overpotentials of 93 and 210 mV to reach current densities of 10 and 50 mA·cm^(−2).In the double electrode cell composed by WFeNi_(2)S_(4)/Ni_(3)S_(2)/NF electrocatalyst,a low cell voltage of 1.52 V was required to reach a current density of 10 mA·cm^(−2),and 91.6%of this value was preserved after 24 h electrolysis operation.The performance of FeNi_(2)S_(4)/Ni_(3)S_(2)/NF electrocatalyst is superior to most of the current bifunctional electrocatalytic materials.Density functional theory(DFT)theoretical calculations also revealed a more intense electron transfer process that can be facilitated by constructing FeNi_(2)S_(4)and Ni_(3)S_(2)/NF interface,which may be the main reason for the archived excellent electrochemical performance.