Guosong Zeng

Guosong Zeng
Lawrence Berkeley National Laboratory | LBL · Chemical Sciences Division

Doctor of Philosophy

About

34
Publications
5,413
Reads
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692
Citations
Citations since 2017
31 Research Items
681 Citations
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
Additional affiliations
April 2018 - present
Lawrence Berkeley National Laboratory
Position
  • PostDoc Position

Publications

Publications (34)
Article
Full-text available
Photoelectrochemical (PEC) water splitting, which utilizes sunlight and water to produce hydrogen fuel, is potentially one of the most sustainable routes to clean energy. One challenge to success is that, to date, similar materials and devices measured in different labs or by different operators lead to quantitatively different results, due to the...
Article
Full-text available
Photoelectrochemical (PEC) water splitting, one of the most promising technologies for clean hydrogen generation, has drawn considerable attention over the past few decades. Achieving simultaneous highly efficient and stable unassisted PEC water splitting has been the “holy grail” in clean and renewable fuel generation. State-of-the-art photoelectr...
Article
A prerequisite for advancing hybrid solar light harvesting systems is a comprehensive understanding of the spatiotemporal dynamics of photoinduced interfacial charge separation. Here, we demonstrate access to this transient charge redistribution for a model hybrid system of nanoporous zinc oxide (ZnO) and ruthenium bipyridyl chromophores. The site-...
Article
Full-text available
The chemical transformations that occur in metal oxides under operating conditions limit their applications for artificial photosynthesis. Understanding these chemical changes is a prerequisite to achieve sustainable production of solar fuels and chemicals. Herein, we use a correlative approach to unravel how cuprous oxide (Cu2O) photoelectrodes ch...
Article
A facet-selective atomic layer deposition (FS-ALD) technique was employed to selectively cover the (111) facets of Cu NCs with ultrathin Al2O3, which significantly increases the faradaic efficiency ratio of C2H4/CH4 in both H-type and GDE flow cells. This Al2O3 overcoating also effectively suppresses the dynamic mobility and aggregation of Cu NCs d...
Article
Catalysts based on Cu nanocrystals (NCs) for electrochemical CO 2 ‐to‐C 2+ conversion with high activity have been a subject of considerable interest, but poor stability and low selectivity for a single C 2+ product remain obstacles for realizing sustainable carbon‐neutral cycles. Here, we used the facet‐selective atomic layer deposition (FS‐ALD) t...
Article
Full-text available
Development of an efficient yet durable photoelectrode is of paramount importance for deployment of solar-fuel production. Here, we report the photoelectrochemically self-improving behaviour of a silicon/gallium nitride photocathode active for hydrogen production with a Faradaic efficiency approaching ~100%. By using a correlative approach based on...
Article
The growth of the hydrogen economy is predicated on advancements in electrochemical energy technologies, with water electrolysis as a key component to the technological portfolio. Much of the focus on anode catalyst development for polymer electrolyte membrane water electrolyzers (PEMWE) is centered on activity as controlled by compositional and mo...
Article
Significance Electrochemical reduction of CO 2 to fuels and valuable chemicals is a global imperative to address energy and climate challenges. Despite enormous efforts, there is not yet a commercial process. The best catalyst remains Cu metal, but a great deal of controversy revolves around the role of the presence of oxygen in the material. We co...
Article
Photoelectrochemical (PEC) water splitting is an attractive method to produce carbon dioxide emission‐free hydrogen fuel. However, most PEC devices are small and lacking the durability and reproducibility necessary for commercial applications. In article number 2002706, Nemanja Danilovic and co‐workers describe the scale‐up of an integrated PEC pla...
Article
Full-text available
Reducing the precious metal content of water oxidation catalysts for proton-exchange-membrane water electrolyzers remains a critical barrier to their large-scale deployment. Herein, we present an engineered architecture for supported iridium catalysts, which enables decreased precious metal content and improved activity and conductivity. The improv...
Article
Photoelectrochemical (PEC) water splitting provides a pathway to generate sustainable clean fuels using the two most abundant resources on Earth: sunlight and water. Currently, most of the successful models of PEC cells are still fabricated on small scales near 1 cm², which largely limits the mass deployment of solar‐fuel production. Here, the scal...
Article
Gallium oxide has been attracting much interest due to its tremendous potential for power device application. The (BxGa1−x)2O3 ternary alloys of monoclinic and orthorhombic phases with the B-content covering the full composition were studied using first-principles density functional theory calculations. The effect of the B-content on the structural...
Article
Stable, cost effective, and efficient solar water splitting is the “Holy Grail” for sustainable clean fuels from two most abundant resources, sunlight and water. This approach requires the combination of light absorbers and surface coating to perform catalytic reactions and enhance the stability and charge transport. Thus, accurate characterization...
Article
We report here a combined experimental and theoretical investigation of the role of surface roughening on the CO2 reduction reaction (CO2RR) over Cu. We compare the activity and product selectivity of electrochemically polished Cu with those of Cu surfaces roughened by plasma pretreatment in Ar, O2, or N2. We find that differences in overall CO2RR...
Article
Carrier-selective contacts have become a prominent path forward towards efficient crystalline silicon (c-Si) photovoltaics. Among the proposed contacting materials, organic materials may offer simplified and low-cost processing compared with typical vacuum deposition techniques. Here, branched polyethyleneimine (b-PEI) is presented as an electron-t...
Article
Conversion of CO2 to reduced products is a promising route to alleviate irreversible climate change. Here we report the synthesis of a Co-based phthalocyanine with pyridine moieties (CoPc-Pyr), which is supported on a carbon electrode and shows Faradaic efficiency ∼90% for CO at 490 mV of overpotential (-0.6 V vs reversible hydrogen electrode (RHE)...
Article
Improving the stability of semiconductor materials is one of the major challenges for sustainable and economic photoelectrochemical water splitting. N-terminated GaN nanostructures have emerged as a practical protective layer for conventional high efficiency but unstable Si and III–V photoelectrodes due to their near-perfect conduction band-alignme...
Article
Full-text available
This work describes process development and associated characterization of a plasma-enhanced atomic layer deposition process for vanadium nitride (VN) using tetrakis(dimethylamido)vanadium and nitrogen plasma over a deposition temperature range from 150 to 300 °C. The authors characterize these films using x-ray photoelectron spectroscopy, x-ray di...
Article
As an earth-abundant narrow bandgap semiconductor material with mature manufacturing process, silicon has already been extensively used in photovoltaic industry. However, its low stability in aqueous conditions becomes an obstacle for its application in artificial photosynthesis. Thus, a great amount of efforts has been directed towards developing...
Article
This talk will give an overview of the HydroGEN Photoelectrochemistry (PEC) Supernode and present recent progress. This Supernode project is a collaboration of nine PEC capability nodes that are part of the HydroGEN Advanced Water Splitting Materials (AWSM) consortium. These nodes are contributing to a common objective of developing an understandin...
Article
Full-text available
The authors have studied the plasma-enhanced atomic layer deposition of TixV1-xN using tetrakis(dimethylamido) titanium, tetrakis(dimethylamido) vanadium, and nitrogen plasma. Through modification of the ratio of TiN to VN deposition cycles, the value of x can be well controlled. X-ray photoelectron spectroscopy analyses indicate that the films are...
Article
Full-text available
The original PDF version of this Article contained missing labels in Figure 3. This has now been corrected in the PDF; the HTML version of the paper was correct from the time of publication.
Article
Full-text available
We explore how crystallographic order and orientation affect the tribological (friction and wear) performance of gallium nitride (GaN), through experiments and theory. Friction and wear were measured in every direction on the c-plane of GaN through rotary wear experiment. This revealed a strong crystallographic orientation dependence of the sliding...
Article
Ultralow wear nature of gallium nitride (GaN) has been revealed recently. The wear rate for GaN has a significant dependence on humidity, ranging from 9 × 10⁻⁹ mm³/Nm to 9.5 × 10⁻⁷ mm³/Nm; the mechanisms responsible for this variation in wear remain unclear. Here, we performed reciprocal sliding test on GaN under different environments and characte...
Article
The present study systematically investigated the mechanical properties of wire-based (wire and arc additive manufacturing, known as WAAM) deposition of steel metals, both stainless steel 304 and mild steel ER70S. Graded material properties of stainless steel 304 were observed for wear and hardness in the direction of deposition and in Z height, du...
Article
The optoelectronic properties of gallium nitride (GaN) have been well studied for decades, with results being translated to applications in solid state lighting and lasers, thermoelectricity, solar cells, power electronics, etc. However, the mechanical and tribological properties of GaN have been studied and understood far less than its optoelectro...
Article
Atomic layer deposited (ALD) alumina is a promising candidate for use as a wear-resistant and protective coating in MEMS and other applications. While the tribological properties of ALD alumina may be affected by numerous factors related to processing, environment, and operating conditions, its wear behavior is neither quantified nor well understoo...
Article
Here, we reveal a remarkable (and surprising) physical property of GaN: it is extremely wear resistant. In fact, we measured the wear rate of GaN is approaching wear rates reported for diamond. Not only does GaN have an ultralow wear rate but also there are quite a few experimental factors that control the magnitude of its wear rate, further contri...
Chapter
Focused ion beam has become an increasingly popular tool for the manufacturing of various types of micro-/nanostructures and devices for different applications. In this chapter, the recent developments of the FIB technologies in the micro/nano manufacturing are presented in details. FIB technologies mainly involve four main approaches: imaging, mil...

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Project (1)
Project
wear mechanism, tribochemistry, surface states, III-Nitrides