DOI: 10.5061/dryad.hqbzkh1t9
title: Data from: Polyoxometalated metal-organic framework superstructure for stable water oxidation

description: Stable non-precious catalysts are vital for large-scale alkaline water
 electrolysis. Here, we report a grafted superstructure, MOF@POM, formed by
 self-assembling a metal-organic framework (MOF) with polyoxometalate
 (POM). In situ electrochemical transformation converts MOF into active
 metal (oxy)hydroxides with a low overpotential of 178 millivolts at 10
 milliamperes per square centimeter. An anion exchange membrane water
 electrolyzer incorporating this catalyst achieves 3 amperes per square
 centimeter at 1.78 volts at 80 degrees Celsius and stable operation at 2
 amperes per square centimeter for 5,140 hours at room temperature. In-situ
 electrochemical spectroscopy and theoretical studies revealed that the
 synergistic interactions between metal atoms create a fast
 electron-transfer channel from catalytic iron and cobalt sites, nickel,
 and tungsten in the polyoxometalate to the electrode, stabilizing the
 metal sites and preventing dissolution.
description: # Data from: Polyoxometalated metal-organic framework superstructure for
 stable water oxidation Dataset DOI:
 [10.5061/dryad.hqbzkh1t9](10.5061/dryad.hqbzkh1t9) ## Description of the
 data and file structure Dataset 1 is the data from Figure 1E: Full-range
 synchrotron PDF analysis for MOF@POM, with the corresponding Rietveld
 refinement and the calculated partial PDF patterns of the Ni-Fe
 distance.This dataset contains the full-range synchrotron PDF analysis of
 MOF@POM, along with the corresponding Rietveld refinement results and
 partial PDF patterns from which the Ni–Fe distance was derived. The first
 three columns (x1, y1, y2) represent the experimental measurements and the
 fitting results. The fourth and fifth columns (x2, y3) provide the p-PDF
 data for Ni–Fe. The final two columns (x3, y4) show the residuals between
 y1 and y2. Both the x- and y-axes are given in units of atomic distance.
 Dataset 2 is the data from Figure 2A: CV curves of MOF, MOF@POM, and the
 reference samples.In this dataset, each pair of columns represents the
 voltage–current relationship for one sample. From left to right, the
 samples are MOF, MOF@POM, NiFe-LDHs, CoFe-LDHs, and NF. The x-axis is
 measured in volts (V), and the y-axis is in mA·cm−2. Dataset 3 is the data
 from Figure 2B: Polarization curves of the AEMWE cell using MOF@POM as the
 anode.Here, each pair of columns represents the current–voltage
 relationship for one sample. From left to right, the samples are
 MOF@POM-25°C, MOF@POM-60°C, MOF@POM-80°C, NF-25°C, NF-60°C, and NF-80°C.
 The x-axis is given in mA·cm−2, while the y-axis is in volts (V). Dataset
 4 is the data from Figure 3A: XRD comparison of MOF@POM in different
 states during the water oxidation.Each pair of columns in this dataset
 corresponds to a set of XRD data. From left to right, these represent
 PDF#14-3266, Final state, Transition state, and Pristine state. The x-axis
 is measured in degrees, and the y-axis in arbitrary units (a.u.). Dataset
 5 is the data from Figure 3C:  p-PDF fitting of Ni-Ni in MOF@POM-act..In
 this dataset, the first column is x and the second column is y. Both axes
 are reported in units of atomic distance. Dataset 6 is the data from
 Figure 3D:  XANES spectra of Co, Fe Ni at different potentials of
 MOF@POM. Each pair of columns here represents a set of XAS data. From left
 to right, the sequences are Co-ocp, Co-1.23, Co-1.43, Co-postOER, Fe-ocp,
 Fe -1.23, Fe -1.43, Fe -postOER, Ni-ocp, Ni -1.23, Ni -1.43, Ni -1.63, and
 Ni -postOER. The x-axis is measured in eV, and the y-axis in arbitrary
 units (a.u.). Dataset 7 is the data from Figure 4C: The stability (10%
 sites/dissolution rate) is a function of the working potential and
 dissolution barrier.In this dataset, the first 200 columns and the
 following 200 columns correspond to CoFeOOH and POM/CoFeOOH, respectively.
 By converting these data into a matrix, one can obtain the heatmap data
 for CoFeOOH and POM/CoFeOOH. The x-axis is measured in volts (V), and the
 y-axis in hours(h). ## Access information Other publicly accessible
 locations of the data: * n/a Data was derived from the following sources:
 * n/a