Publications by authors named "Ruguang Ma"

Engineering-rich electrocatalyst defects play a critical role in greatly promoting the charge storage/transfer capability of an energy storage/conversion system. Here, an ingenious and effective two-step strategy was used to synthesize a bimetallic sulfide/oxide composite with a coaxial carbon coating, starting from mixing well-dispersed MoO nanobelts and Co-PAA compound, followed by a selective etching process. The simultaneous formation of dual defects of interlayer defect and sulfur-rich vacancies as well as MoO/MoS/CoS heterojunctions noticeably enhances both electron transfer and ion diffusion kinetics.

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Article Synopsis
  • Charge-redistributed CoO/FeCoP heterointerfaces are developed to enhance electrocatalytic urea oxidation in alkaline solutions, achieving high efficiency with only 1.41 V RHE at 100 mA cm.
  • The electrocatalyst demonstrates a low Tafel slope of 74 mV dec, indicating fast reaction kinetics for urea oxidation.
  • A remarkable stability of 36 hours showcases the effectiveness of the charge redistribution strategy in creating highly efficient electrocatalysts.
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  • - Zinc-ion batteries (ZIBs) are gaining attention for their high capacity, affordability, and safety as flexible energy storage systems, particularly when enhanced with hydrogel electrolytes.
  • - Recent research highlights the impressive qualities of cellulose hydrogel, such as toughness and self-healing, which are being applied to improve flexible zinc-based batteries while addressing current performance challenges.
  • - This paper reviews the physicochemical properties of cellulose hydrogel electrolytes in ZIBs, analyzes their performance in various conditions, and discusses future prospects and challenges in developing this technology.
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Lattice engineering is reported to enhance Zn storage capability of MnO anionic doping, which effectively lowers the Zn diffusion barrier and boosts Zn diffusion kinetics. The optimized MnOS@rGO exhibits superior rate capability and reversible capacity of 115.1 mA h g at 0.

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Electrochemical reduction of nitrate to ammonia (NRA) offers a sustainable approach for NH production and NO removal but suffers from low NH yield rate (<1.20 mmol h cm). We present bimetallic CuAg nanotips with tailored local environment, which achieve an ultrahigh NH yield rate of 2.

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While great efforts have been made to improve the electrocatalytic activity of existing materials toward hydrogen evolution reaction (HER), it is also importance for searching new type of nonprecious HER catalysts to realize the practical hydrogen evolution. Herein, we firstly report nanocrystalline transition metal tetraborides (TMB, TM=W and Mo) as an efficient HER electrocatalyst has been synthesized by a single-step solid-state reaction. The optimized nanocrystalline WB exhibits an overpotential as low as 172 mV at 10 mA/cm and small Tafel slope of 63 mV/dec in 0.

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Article Synopsis
  • Scientists made tiny particles of a metal called ruthenium and covered them with special layers made of carbon and nickel, which are attached to carbon tubes.!
  • The combination of these materials helps improve the way the tiny particles interact with water, making it easier for the water to break down and produce hydrogen.!
  • This research could be important for creating clean energy by efficiently producing hydrogen from water.!
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An "inside-out regulation" strategy is proposed to improve the Zn storage of MnO by Ni doping into the lattice and graphene wrapping outside the nanoparticles. The as-prepared Ni-MnO@rGO exhibits 112 mA h g at 2.0 A g over 800 cycles, due to the improved transport of electrons and ions from the synergistical function of intrinsic doping and external graphene encapsulation.

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In this study, a Cu NPs-incorporated carbon-containing mesoporous SiO (Cu/C-SiO) was successfully synthesized through a grinding-assisted self-infiltration method followed by an in situ reduction process. The obtained Cu/C-SiO was then employed as a Fenton-like catalyst to remove tetracycline (TC) from aqueous solutions. TEM, EDS, XRD, N adsorption-desorption, FTIR, and XPS methods were used to characterize the crystal structure, morphology, porosity, chemical composition, and surface chemical properties of the catalyst.

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Hydrogen production from electrolytic water is an important sustainable technology to realize renewable energy conversion and carbon neutrality. However, it is limited by the high overpotential of oxygen evolution reaction (OER) at the anode. To reduce the operating voltage of electrolyzer, herein thermodynamically favorable glycerol oxidation reaction (GOR) is proposed to replace the OER.

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For large-scale industrial applications, it is highly desirable to create effective, economical electrocatalysts with long-term stability for the hydrogen evolution reaction (HER) at a large current density. Herein, we report a unique motif with crystalline CoFe-layered hydroxide (CoFe-LDH) nanosheets enclosed by amorphous ruthenium hydroxide (a-Ru(OH)/CoFe-LDH) to realize the efficient hydrogen production at 1000 mA cm, with a low overpotential of 178 mV in alkaline media. During the continuous HER process for 40 h at such a large current density, the potential remains almost constant with only slight fluctuations, indicating good long-term stability.

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Li metal anode is considered as one of the most desirable candidates for next-generation battery due to its lowest electrochemical potential and high theoretical capacity. However, undesirable dendrite growth severely exacerbates the interfacial stability, thus damaging battery performance and bringing safety concerns. Here, an efficient strategy is proposed to stabilize Li metal anode by digesting dendrites sprout using a 3D flexible superlithiophilic membrane consisting of poly(vinylidene fluoride) (PVDF) and ZnCl composite nanofibers (PZEM) as a protective layer.

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Although graphene is by far the most famous example of two-dimensional (2D) materials, which exhibits a wealth of exotic and intriguing properties, it suffers from a severe drawback. In this regard, the exploration of silicene, the silicon analog of the graphene material, has attracted substantial interest in the past decade. This review therefore provides a comprehensive survey of recent theoretical and experimental works on this 2D material.

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The electrocatalytic CO reduction reaction (CORR) and oxygen reduction reaction (ORR) are important approaches to realize energy conversion and sustainable development. However, sluggish reaction kinetics severely hinders the practical application of devices related to these reactions. N-doped graphene (NG) with unique properties exhibits great potential in catalyzing the CORR and ORR, which is attributed to the electron redistribution.

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Polyacrylic acid (PAA) is a promising binder for the high-capacity Si anode. However, the one-dimensional structure of PAA could cause the linear molecular chains to slide from the Si surface during the charge-discharge processes, leading to insufficient suppression of the massive volume expansion of the Si anode. Herein, a soft-rigid dual chains' network of PAA-sodium silicate (PAA-SS) was successfully constructed by cross-linking PAA and SS in situ at room temperature.

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Single-site metal atoms (SMAs) on supports are attracting extensive interest as new catalytic systems because of maximized atom utilization and superior performance. However, rational design of configuration-optimized SMAs with high activity from the perspectives of fundamental electron spin is highly challenging. Herein, N-coordinated Fe single atoms are successfully distributed over axial carbon micropores to form dangling-FeN centers (d-FeN).

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Article Synopsis
  • To achieve a zero-carbon economy, advanced catalysts are needed for hydrogen production and biomass upgrading using renewable energy.
  • Nickel-based non-precious electrocatalysts are promising candidates, but understanding their site coordination is still a challenge.
  • The study focuses on creating different oxyanion-coordinated nickel oxyhydroxides through electrochemical oxidation, revealing that the specific coordination environment of NiOOH-PO enhances its catalytic activity for converting methanol to formate.
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Sluggish kinetics of the oxygen evolution reaction during the water splitting requires high-performance electrocatalysts with low cost and good stability. Metal-organic frameworks (MOFs) have attracted much attention as electrocatalysts owing to their unique properties. To improve their electrocatalytic activity and stability, we report a selenylation method to modulate the morphology and interfaces by forming flower-like MOF-selenide nanocomposites.

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Replacing commercial noble metal catalysts with earth-abundant metal catalysts for hydrogen production is an important research direction for electrolytic water. Improving the catalytic performance of non-noble metals while maintaining stability is a key challenge for alkaline hydrogen evolution. Herein, we combined alkali etching and surface phosphating to regulate the properties of Cr-doped CoMoO material, forming a surface structure in which amorphous cobalt phosphate and Cr-doped Co(Mo)O coexist.

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The oxygen reduction reaction (ORR) is a pivotal half-reaction for full cells and metal-air batteries. However, the intrinsic sluggish kinetics of the ORR inhibits the practical applications of these environmentally friendly energy-conversion devices. Therefore, highly efficient electrocatalysts with low cost are required to promote the ORR process.

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Hollow MoS/Co-0.1 nanopillars were successfully synthesized by sulfurizing CoMoO and subsequent acid etching, which were used as the anode material for lithium ion batteries. The introduction of suitable metal Co into MoS nanopillars effectively accelerates electron/ion transport kinetics, leading to high specific capacity and superior rate capability and cycling stability.

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Skin-like electronics that can provide comprehensively tactile sensing is required for applications such as soft robotics, health monitoring, medical treatment, and human-machine interfaces. In particular, the capacity to monitor the contact parameters such as the magnitude, direction, and contact location of external forces is crucial for skin-like tactile sensing devices. Herein, a flexible electronic skin which can measure and discriminate the contact parameters in real time is designed.

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NiFe layered double hydroxides (LDHs) usually exhibit high water-dissociation ability in the alkaline media and also provide an ideal substrate for anchoring noble metals, such as platinum (Pt), due to the 2D microstructure. Appropriate regulation of the interaction between Pt and substrate could enhance the intrinsic activity of composite catalysts toward the hydrogen evolution reaction (HER) in the alkaline media. Herein, we electrodeposit Pt nanoparticles on amorphous NiFe LDH (Pt/NiFe-ED) or crystalline NiFe LDH (Pt/NiFe-HD) to regulate the interaction between Pt and NiFe LDH.

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Multiparameter integrated sensors are required for the next generation of flexible wearable electronics. However, mutual interference between detected signals is a technical bottleneck for a flexible tactile sensor to realize pressure-strain monitoring simultaneously and sensitively. Herein, a flexible dual-parameter pressure-strain sensor based on the three-dimensional (3D) tubular graphene sponge (TGS) and spider web-like stretchable electrodes is designed and fabricated.

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The effective non-precious metal catalysts toward the oxygen evolution reaction (OER) are highly desirable for electrochemical water splitting. Herein, we prepare a novel glass-ceramic (Ni Sn@triMPO ) by embedding crystalline Ni Sn nanoparticles into amorphous trimetallic phosphate (triMPO ) matrix. This unique crystalline-amorphous nanostructure synergistically accelerates the surface reconstruction to active Ni(Fe)OOH, due to the low vacancy formation energy of Sn in glass-ceramic and high adsorption energy of PO at the V sites.

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