Jianbo Liang
National Institute for Materials Science
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Featured researches published by Jianbo Liang.
ACS Nano | 2015
Wei Ma; Renzhi Ma; Chengxiang Wang; Jianbo Liang; Xiaohe Liu; Kechao Zhou; Takayoshi Sasaki
Cost-effective electrocatalysts based on nonprecious metals for efficient water splitting are crucial for various technological applications represented by fuel cell. Here, 3d transition metal layered double hydroxides (LDHs) with varied contents of Ni and Fe were successfully synthesized through a homogeneous precipitation. The exfoliated Ni-Fe LDH nanosheets were heteroassembled with graphene oxide (GO) as well as reduced graphene oxide (rGO) into superlattice-like hybrids, in which two kinds of oppositely charged nanosheets are stacked face-to-face in alternating sequence. Heterostructured composites of Ni2/3Fe1/3 LDH nanosheets and GO (Ni2/3Fe1/3-GO) exhibited an excellent oxygen evolution reaction (OER) efficiency with a small overpotential of about 0.23 V and Tafel slope of 42 mV/decade. The activity was further improved via the combination of Ni2/3Fe1/3 LDH nanosheets with more conductive rGO (Ni2/3Fe1/3-rGO) to achieve an overpotential as low as 0.21 V and Tafel plot of 40 mV/decade. The catalytic activity was enhanced with an increased Fe content in the bimetallic Ni-Fe system. Moreover, the composite catalysts were found to be effective for hydrogen evolution reaction. An electrolyzer cell powered by a single AA battery of 1.5 V was demonstrated by using the bifunctional catalysts.
Journal of the American Chemical Society | 2011
Renzhi Ma; Jianbo Liang; Kazunori Takada; Takayoshi Sasaki
Co-Fe layered double hydroxides at different Fe/Co ratios were synthesized from brucite-like Co(2+)(1-x)Fe(2+)(x)(OH)(2) (0 ≤ x ≤ 1/3) via oxidative intercalation reaction using an excess amount of iodine as the oxidizing agent. A new redoxable species: triiodide (I(3)(-)), promoted the formation of single-phase Co-Fe LDHs. The results point to a general principle that LDHs with a characteristic ratio of total trivalent and divalent cations (M(3+)/M(2+)) at 1/2 may be the most stable in the oxidative intercalation procedure. At low Fe content, e.g., starting from Co(2+)(1-x)Fe(2+)(x)(OH)(2) (x < 1/3), partial oxidation of Co(2+) to Co(3+) takes place to reach the M(3+)/M(2+) threshold of 1/2 in as-transformed Co(2+)(2/3)-(Co(3+)(1/3-x)-Fe(3+)(x)) LDHs. Also discovered was the cointercalation of triiodide and iodide into the interlayer gallery of as-transformed LDH phase, which profoundly impacted the relative intensity ratio of basal Bragg peaks as a consequence of the significant X-ray scattering power of triiodide. In combination with XRD simulation, the LDH structure model was constructed by considering both the host layer composition/charge and the arrangement of interlayer triiodide/iodide. The work provides a clear understanding of the thermodynamic and kinetic factors associated with the oxidative intercalation reaction and is helpful in elucidating the formation of LDH structure in general.
Advanced Materials | 2014
Renzhi Ma; Xiaohe Liu; Jianbo Liang; Yoshio Bando; Takayoshi Sasaki
Artificial superlattice nanocomposites are successfully prepared by electrostatic heteroassembly of redoxable Co-Al or Co-Ni layered double hydroxide (LDH) nanosheets with graphene. The superlattice electrodes exhibit a high capacity up to ca. 650 F/g, which is approximately 6 times that of pure graphene. The composites are found to be capable of superfast charging and discharging, up to ca. 100 Hz, comparable with the high-power performance of graphene electrodes.
Journal of the American Chemical Society | 2012
Renzhi Ma; Jianbo Liang; Xiaohe Liu; Takayoshi Sasaki
The topochemical transformation from transition-metal brucite hydroxide (Co(1-x)Fe(x)(OH)(2), Co(OH)(2), Co(1-x)Ni(x)(OH)(2)) to corresponding (Co(2+)-(Co(3+))-Fe(3+), Co(2+)-(Ni(2+))-Co(3+)) LDH under oxidizing halogen agents (iodine, bromine) exhibits different staging phenomena depending on the metallic composition/ratio in starting brucite. A plausible charge hopping mechanism based on valence interchange between redoxable charge center (Fe(3+)/Co(3+)) and neighboring divalent sites in the host sheet is proposed to understand the restoration of electron donor sites at the interface between brucite crystallites and halogen agents, which ensures a continual oxidative reaction, and a staged intercalation/diffusion of in situ reduced halide anions into the interlayer gallery commensurate with the host charge propagation. The discussion on the correlation between staging product and metallic composition/ratio offers a general perspective and new insights into M(2+)/M(3+) ratio and cation ordering, host layer charge, and phase evolution in LDH structure.
Inorganic Chemistry | 2013
Jianbo Liang; Renzhi Ma; Yasuo Ebina; Fengxia Geng; Takayoshi Sasaki
We report the synthesis and structure characterization of a new family of lanthanide-based inorganic-organic hybrid frameworks, Ln(2)(OH)(4)[O(3)S(CH(2))(n)SO(3)]·2H(2)O (Ln = La, Ce, Pr, Nd, Sm; n = 3, 4), and their oxide derivatives. Highly crystallized samples were synthesized by homogeneous precipitation of Ln(3+) ions from a solution containing α,ω-organodisulfonate salts promoted by slow hydrolysis of hexamethylenetetramine. The crystal structure solved from powder X-ray diffraction data revealed that this material comprises two-dimensional cationic lanthanide hydroxide {[Ln(OH)(2)(H(2)O)](+)}(∞) layers, which are cross-linked by α,ω-organodisulfonate ligands into a three-dimensional pillared framework. This hybrid framework can be regarded as a derivative of UCl(3)-type Ln(OH)(3) involving penetration of organic chains into two {LnO(9)} polyhedra. Substitutional modification of the lanthanide coordination promotes a 2D arrangement of the {LnO(9)} polyhedra. A new hybrid oxide, Ln(2)O(2)[O(3)S(CH(2))(n)SO(3)], which is supposed to consist of alternating {[Ln(2)O(2)](2+)}(∞) layers and α,ω-organodisulfonate ligands, can be derived from the hydroxide form upon dehydration/dehydroxylation. These hybrid frameworks provide new opportunities to engineer the interlayer chemistry of layered structures and achieve advanced functionalities coupled with the advantages of lanthanide elements.
ChemInform | 2015
Jianbo Liang; Renzhi Ma; Takayoshi Sasaki
Layered rare earth hydroxides (LREHs), a special class of layered solids featuring cationic host layers of rare earth (RE) hydroxides, have become recognized as novel multifunctional materials in which the intercalation reactivity and host–guest interaction are coupled with the appealing physicochemical properties of RE elements. This chapter presents a background survey and an up-to-date overview on the development of LREH materials in terms of their synthesis, structural characterization, and photoluminescence properties. We first summarize the synthetic strategies to produce LREHs in various forms. In the following section, the basic structural features of LREH compounds are illustrated for typical anionic forms, and we highlight the critical importance of this knowledge in interpreting their fundamental properties and functionality hunting. Then, the photoluminescence properties of LREH compounds are discussed. Various phosphors with tunable or enhanced performance, including forms of oriented films, exfoliated nanosheet crystallites, and hybrid nanocomposites, are designed based on the structural features of LREH compounds. We describe the major contributions to this topic from studies conducted before 2015.
Chemistry of Materials | 2010
Jianbo Liang; Renzhi Ma; Nobuo Iyi; Yasuo Ebina; Kazunori Takada; Takayoshi Sasaki
Chemistry of Materials | 2010
Jianbo Liang; Renzhi Ma; Fengxia Geng; Yasuo Ebina; Takayoshi Sasaki
Inorganic Chemistry | 2011
Fengxia Geng; Renzhi Ma; Yoshitaka Matsushita; Jianbo Liang; Yuichi Michiue; Takayoshi Sasaki
Dalton Transactions | 2014
Jianbo Liang; Renzhi Ma; Takayoshi Sasaki