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Combinatorial alloying improves bismuth vanadate photoanodes via reduced monoclinic distortion

Journal Article · · Energy & Environmental Science
DOI:https://doi.org/10.1039/c8ee00179k· OSTI ID:1532340
 [1];  [1];  [2];  [3];  [1];  [1];  [1];  [4];  [1];  [5];  [1]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis (JCAP)
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis (JCAP); Toyota Research Inst. of North America, Ann Arbor, MI (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. Andres Bello, Santiago (Chile); Univ. of California, Berkeley, CA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States); Kavli Energy NanoSciences Inst., Berkeley, CA (United States)

Improving the efficiency of solar-powered oxygen evolution is both critical for development of solar fuels technologies and challenging due to the broad set of properties required of a solar fuels photoanode. Bismuth vanadate, in particular the monoclinic clinobisvanite phase, has received substantial attention and has exhibited the highest radiative efficiency among metal oxides with a band gap in the visible range. Efforts to further improve its photoelectrochemical performance have included alloying one or more metals onto the Bi and/or V sites, with progress on this frontier stymied by the difficulty in computational modelling of substitutional alloys and the high dimensionality of co-alloying composition spaces. Since substitutional alloying concurrently changes multiple materials properties, understanding the underlying cause for performance improvements is also challenging, motivating our application of combinatorial materials science techniques to map photoelectrochemical performance of 948 unique bismuth vanadate alloy compositions comprising 0 to 8% alloys of P, Ca, Mo, Eu, Gd, and W along with a variety of compositions from each pairwise combination of these elements. Upon identification of substantial improvements in the (Mo,Gd) co-alloying space, structural mapping was performed to reveal a remarkable correlation between performance enhancement and a lowered monoclinic distortion. Lastly, first-principles density functional theory calculations indicate that the improvements are due to a lowered hole effective mass and hole polaron formation energy, and collectively, our results identify the monoclinic distortion as a critical parameter in the optimization and understanding of bismuth vanadate-based photoanodes.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1532340
Alternate ID(s):
OSTI ID: 1454639
Journal Information:
Energy & Environmental Science, Journal Name: Energy & Environmental Science Journal Issue: 9 Vol. 11; ISSN EESNBY; ISSN 1754-5692
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Elaborately Modified BiVO 4 Photoanodes for Solar Water Splitting journal December 2018
Analyzing machine learning models to accelerate generation of fundamental materials insights journal March 2019
Tracking materials science data lineage to manage millions of materials experiments and analyses journal July 2019
Synthesis, optical imaging, and absorption spectroscopy data for 179072 metal oxides journal March 2019
Multi-modal optimization of bismuth vanadate photoanodes via combinatorial alloying and hydrogen processing journal January 2019
Effects of yttrium, ytterbium with tungsten co-doping on the light absorption and charge transport properties of bismuth vanadate photoanodes to achieve superior photoelectrochemical water splitting journal January 2020

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