Electric cars such as the Nissan Leaf may look no different from the standard family runaround. But the new materials that go into them could revolutionize the market for metals used in the industry, opening up a new field for commodities investors. “We identified electric vehicles as an area where we are at an inflection point for demand,” said Duncan Goodwin, portfolio manager of the Baring Global Resources Fund. Around 12 percent of the fund’s…